CN120097539A - High-salt industrial wastewater treatment process and equipment - Google Patents

Abstract

The invention relates to the field of high-salt industrial sewage treatment and provides a high-salt industrial sewage treatment process and a device, wherein the high-salt industrial sewage treatment process and device comprise an adjusting homogenizing tank, a high-density sedimentation tank, an ozone contact oxidation tank, a multistage biological aeration filter tank, a high-efficiency biological reaction tank, a filter cloth filter and a monitoring water tank, wherein a water inlet of the adjusting homogenizing tank is connected with a drainage pipeline of high-salt industrial sewage, a water outlet of the adjusting homogenizing tank is connected with a water inlet of the high-density sedimentation tank, a water outlet of the high-density sedimentation tank is connected with a water inlet of the ozone contact oxidation tank, a water outlet of the ozone contact oxidation tank is connected with a water inlet of the multistage biological aeration filter tank, a water outlet of the multistage biological aeration filter tank is connected with a water inlet of the high-efficiency biological reaction tank, a water outlet of the filter cloth filter is connected with a water inlet of the monitoring water tank, and the monitoring water tank is discharged through the water outlet.

Description

High-salt industrial sewage treatment process and device

Technical Field

The invention relates to the field of high-salt industrial sewage treatment, in particular to a high-salt industrial sewage treatment process and a high-salt industrial sewage treatment device.

Background

The south port ethylene project is a representative project of a high-end new material project cluster of Tianjin south port of China petrochemical industry, and a 120 ten thousand ton/year south port ethylene cracking device is used as a tap, and an industrial chain is extended to construct high-end new material devices such as alpha-olefin, ultra-high molecular weight polyethylene and the like.

And (3) draining the ABS device, neutralizing wastewater by acid and alkali in a condensate station and RO concentrated water in a sewage plant to enable the wastewater to reach the standard, and draining the wastewater.

The ABS device discharges water, the acid-base neutralization wastewater of the condensate station and RO concentrated water of a sewage plant belong to high-salt sewage.

The high-salt sewage treatment system disclosed by the application number CN201720435131.1 comprises a sedimentation tank, a solid-liquid separator, a middle water tank, a multi-medium filter, an electrodialysis device, a water storage tank, an acidification anaerobic tank, an aerobic degradation tank, a membrane bioreactor, a sterilization tank and a clean water tank which are sequentially connected through pipelines, wherein high-salt sewage is discharged into the sedimentation tank and then is sedimentated, solids after sedimentation and separation respectively enter a sludge tank, high-concentration salt water which is permeated out is sucked into a high-salt water collecting box, the acidification anaerobic tank is communicated with the sludge tank, the aerobic degradation tank is communicated with the sludge tank, and a detection device is arranged at an outlet of the sterilization tank.

However, in the process of draining the ABS device, neutralizing wastewater by acid and alkali in a condensate station and treating RO concentrated water in a sewage plant, the following problems exist:

1. The suspended matters in the sewage are more, so that the subsequent biodegradability of the sewage can be influenced;

2. Because the biodegradability of COD in RO concentrated water is very low, organic matters in sewage are difficult to remove by directly adopting a biological method;

3. the multistage biological aerated filter often cannot adjust the internal aeration when in operation, so that COD, ammonia nitrogen and total nitrogen are difficult to remove simultaneously;

4. the biodegradability of sewage is poor, and especially COD existing in sewage is difficult to degrade.

Disclosure of Invention

In order to solve the problems, the invention provides a high-salt industrial sewage treatment process and a device for solving the problems.

In order to achieve the above purpose, the present invention provides the following technical solutions:

The high-salt industrial sewage treatment device comprises an adjusting homogenizing tank, a high-density sedimentation tank, an ozone contact oxidation tank, a multistage biological aeration filter tank, a high-efficiency biological reaction tank, a filter cloth filter and a monitoring water tank, wherein a water inlet of the adjusting homogenizing tank is connected with an ABS device for draining, an acid-base neutralization wastewater of a condensate water station and a drainage pipeline of RO concentrated water of a sewage plant are connected, a water outlet of the adjusting homogenizing tank is connected with a water inlet of the high-density sedimentation tank, a water outlet of the high-density sedimentation tank is connected with a water inlet of the ozone contact oxidation tank, a water outlet of the ozone contact oxidation tank is connected with a water inlet of the multistage biological aeration filter tank, a water outlet of the multistage biological aeration filter tank is connected with a water inlet of the high-efficiency biological reaction tank, a water outlet of the high-efficiency biological reaction tank is connected with a water inlet of the filter cloth filter, a water outlet of the filter cloth filter is connected with a water inlet of the monitoring water tank, and the monitoring water tank is discharged through the water outlet.

The high-density sedimentation tank comprises a coagulation area, a flocculation area, a sedimentation area, a clarification area, a reaction current stabilizer, a solid waste incineration device and a dosing system, wherein the reaction current stabilizer is arranged at the bottoms of the coagulation area and the flocculation area, the output end of the dosing system is connected with the coagulation area and the flocculation area, the water outlet of the clarification area is connected with the water inlet of the ozone contact oxidation tank, a mud scraper is arranged in the sedimentation area, and sludge precipitated at the bottom of the sedimentation area is discharged into the solid waste incineration device through the mud scraper.

The ozone contact oxidation pond comprises an ozone contact oxidation pond body, an ozone diffuser, an ozone generator and an ozone destructor, wherein a water inlet of the ozone contact oxidation pond body is connected with a water outlet of the high-density sedimentation pond, the ozone generator is arranged on the upper side of the ozone contact oxidation pond body, the ozone diffuser is arranged in the ozone contact oxidation pond body, the ozone destructor is arranged on one side of the ozone contact oxidation pond body, the output end of the ozone destructor is connected with the outside, and a water outlet of the ozone contact oxidation pond body is connected with a water inlet of the multistage biological aeration filter.

The multistage biological aeration filter comprises a biological filter body, wherein a water inlet of the biological filter body is connected with a water outlet of an ozone contact oxidation pond body, the biological filter body is provided with four stages, each five stages are connected in series, the biological filter body comprises an aerobic section and an anoxic section, the first stage and the fifth stage are aerobic sections, the second stage to the fourth stage are anoxic sections, an aeration facility is arranged in each stage, a carbon source feeding system is further arranged on the biological filter body, and the water outlet of the biological filter body is connected with the water inlet of the high-efficiency biological reaction pond.

The high-efficiency biological reaction tanks are provided with a plurality of groups, the high-efficiency biological reaction tanks of the plurality of groups are installed in parallel by adopting an upper backflow structure, special flora filter materials are arranged in the high-efficiency biological reaction tanks, an aeration device is arranged at the bottom of the high-efficiency biological reaction tanks, and a water outlet of the high-efficiency biological reaction tanks is connected with a water inlet of a filter cloth filter.

The filter cloth filter comprises a plurality of groups of filter discs which are vertically and parallelly arranged in the device, the outside of the filter discs is wrapped with filter cloth, the average mesh diameter of the filter cloth is not more than 10 microns, and the water outlet of the filter cloth filter is connected with the water inlet of the monitoring pool.

The filter cloth filter is cleaned by a backwashing water tank.

The high-salt industrial sewage treatment process comprises the following steps:

S1, draining the ABS device, draining the acid-base neutralization wastewater of a condensate station and RO concentrated water of a sewage plant into an adjustment homogenizing tank, and homogenizing;

s2, discharging the sewage in the regulating homogenizing tank into a high-density sedimentation tank, flocculating and settling the sewage by adding FeCL3 and PAM, discharging the settled sludge to a solid waste incineration device after settling and separating, and discharging the treated sewage into an ozone contact oxidation tank;

s3, carrying out contact reaction on the sewage and ozone in an ozone contact oxidation pond, wherein the retention time of the sewage and the ozone in the pond is not less than 1.5 hours, the stabilization time is not less than 1 hour, and the treated sewage is discharged into a multistage biological aeration filter;

s4, the sewage passes through an aerobic section of the multistage biological aeration filter, dissolved oxygen is 2-4 mg/L, the main effect is to remove the original COD in the sewage and the excessive carbon source which is added in the anoxic section but not removed, the carbon source and the organic matters in the sewage are converted into carbon dioxide and water, the sewage passes through the anoxic section of the multistage biological aeration filter, the dissolved oxygen is controlled to be 0.2-0.5 mg/L for denitrification, denitrifying bacteria are inoculated, nitrate nitrogen and nitrite nitrogen in the sewage are converted into nitrogen under the action of the denitrifying bacteria to escape from a water body, TN is removed, and then the sewage is discharged into a high-efficiency biological reaction tank;

S5, enabling the sewage to enter a filter material position of the high-efficiency biological reaction tank, performing oxidation and adsorption through special flora among the filter materials to remove refractory organic matters in the water, and then discharging the sewage into a filter cloth filter;

s6, sewage enters a filter through a water inlet weir plate, passes through filter cloth under the action of gravity, enters a central rotary drum after being filtered, and then flows into a monitoring pool from a water outlet;

And S7, discharging the sewage in the monitoring pool after sampling is qualified.

The invention has the advantages that suspended matters in the incoming water can be reduced through the high-density sedimentation tank, the subsequent ozone consumption is reduced, and TP in the sewage can be removed through adding ferric salt, the biological method is directly adopted to remove organic matters in the sewage, so that the B/C ratio of the sewage is firstly improved through an ozone contact oxidation tank and multistage biological aerated filter process, then COD and total nitrogen in the sewage are removed through the multistage biological aerated filter, DO can be flexibly regulated and controlled through regulating the aeration amount of each stage of reactor in each tank body when the multistage biological aerated filter is operated, so that aerobic and anoxic environments are flexibly realized among each stage of reactors, and the aim of simultaneously removing COD, ammonia nitrogen and total nitrogen is fulfilled. Under the aerobic condition, COD in sewage is difficult to remove and is further biodegraded through high-efficiency biological contact oxidation, and finally endogenous substances of microorganisms are synthesized or used for metabolism, so that organic matters in the water are eliminated from the substances. After the technology is successfully used for film formation, even under the conditions of water-entering nutrition impoverishment and no additional nutrition source supplement, the COD which is difficult to degrade in water can be used as an energy source for maintaining the stability and the bioactivity of bacteria, so that the COD in water can be continuously removed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a process flow diagram of the present invention;

FIG. 3 is a schematic diagram of the dosing system of the high density sedimentation tank of the present invention;

FIG. 4 is a schematic diagram of the dosing system of the multistage biological aerated filter of the invention.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.

Embodiment one, the description is given with reference to fig. 1, 2, 3 and 4:

The high-salt industrial sewage treatment device comprises a regulating homogenizing tank, a high-density sedimentation tank, an ozone contact oxidation tank, a multi-stage biological aeration filter tank, a high-efficiency biological reaction tank, a cloth filter and a monitoring water tank,

Wherein the high-density sedimentation tank is 2 sets, and the single-room treatment water quantity is 155t/h.

Ozone contact oxidation pond 1 seat, 2 groups are connected in parallel, each group of 2 stages are connected in parallel, and the processing capacity is 300t/h. Comprises a power supply and control system, a liquid oxygen storage tank, an ozone generator, an ozone contact tank, a cooling water system (heat exchanger) and an ozone tail gas destructor.

The water treatment amount of the multistage biological aerated filter 1 seat is 300t/h. The multistage biological filter is connected in series with 5 stages between 4 stages.

And the water treatment amount is 300t/h in the 1-seat high-efficiency biological reaction tank. The high-efficiency biological reaction tanks 6 are connected in parallel.

The water quantity is 300t/h after the filter cloth is sleeved on the filter 2.

The device also comprises a high-salt sewage regulating homogenizing tank 2 seat and an accident water tank 1 seat.

The water inlet of the regulating homogenizing tank is connected with the ABS device for draining, the acid-base neutralization wastewater of the condensate water station and the RO concentrated water of the sewage plant are connected with the drainage pipeline, the water outlet of the regulating homogenizing tank is connected with the water inlet of the high-density sedimentation tank, the water outlet of the high-density sedimentation tank is connected with the water inlet of the ozone contact oxidation tank, the lifting facilities are arranged in the reaction flow stabilizer of the flocculation area of the high-density sedimentation tank, sewage forms an internal circulation flow state under the pushing of the sewage, the growth and uniformity of the flocculation are facilitated, a certain flow velocity is maintained by utilizing strict hydraulic conditions, meanwhile, the formed flocculation is not broken, and the sewage can be rapidly separated after entering the sedimentation area.

The water outlet of the ozone contact oxidation pond is connected with the water inlet of the multistage biological aeration filter, and the ozone has extremely strong oxidizing property and sterilization property and extremely unstable molecular state. The hydroxyl radical with strong oxidation function can be formed in water, so that organic pollutants in the wastewater can be rapidly removed, and the wastewater is decomposed into oxygen, so that secondary pollution is avoided.

The water outlet of the multistage biological aeration filter is connected with the water inlet of the high-efficiency biological reaction tank, the multistage biological filter adopts multistage parallel connection and multistage serial connection, and aeration facilities are arranged at each stage to adapt to the water quality change of the inlet water, so that flexible switching under the anoxic and aerobic environment can be realized.

The water outlet of the high-efficiency biological reaction tank is connected with the water inlet of the filter cloth filter, the high-efficiency biological reaction tank is specially developed for sewage with low load and poor biodegradability, a special biological flora for nondegradable COD is adopted, and the special biological flora is inoculated on a special high-efficiency biological carrier to form a biological film which is stable and can tolerate various substrates as energy sources.

The water outlet of the filter cloth filter is connected with the water inlet of the monitoring water tank, substances trapped by the filter cloth are increased along with the progress of filtration, when the head loss of the filter cloth is increased and reaches a preset backwashing liquid level, the turntable is required to be cleaned, the control system starts the backwashing process, and after the cleaning is completed, the filter cloth filter can restart normal filtration operation after short blowdown. When in cleaning, the filter cloth filter can continuously filter.

The monitoring pool is discharged through the water outlet.

The high-density sedimentation tank comprises a coagulation area, a flocculation area, a sedimentation area, a clarification area, a reaction current stabilizer, a solid waste incineration device and a dosing system, wherein the reaction current stabilizer is arranged at the bottoms of the coagulation area and the flocculation area, the output end of the dosing system is connected with the coagulation area and the flocculation area, the water outlet of the clarification area is connected with the water inlet of the ozone contact oxidation tank, a mud scraper is arranged in the sedimentation area, and sludge precipitated at the bottom of the sedimentation area is discharged into the solid waste incineration device through the mud scraper.

The high-density sedimentation tank is a compact sewage treatment system integrating coagulation, flocculation, sedimentation clarification and sludge concentration, sewage is fully mixed with FeCl3 and PAM medicaments which are added through a coagulation and flocculation area, and the medicaments are uniformly released through micropores on an adding ring, so that pollutants SS and total phosphorus in the water are removed, and the effluent reaches the design index requirement. Meanwhile, one part of the sludge deposited at the bottom of the tank is discharged to the solid waste incineration device after staying for a period of time, and the other part of the sludge flows back to the flocculation area in front of the high-density tank, so that the impact resistance of the system is enhanced, and meanwhile, the addition of polymer medicaments can be saved. The inclined tube is a honeycomb block, the mud scraper is a suspended central transmission rotary mud scraper (provided with variable frequency), the height of the water distribution weir of the high-density sedimentation tank can be adjusted up and down (the height is 50 mm), and the outlet groove of the high-density sedimentation tank is provided with height-adjustable measures.

The high-density sedimentation tank combines the online analyzer of effluent turbidity and the assay analysis of the water quality suspension of the high-density sedimentation tank by the effects of flocculation tank flocs and sedimentation tank, and timely adjusts the dosage of ferric chloride and PAM.

Judging the condition of the mud level by a mud level meter of the sedimentation tank, controlling the mud level not to exceed 1m, and performing mud discharging operation according to the actual condition of the mud level.

And the inclined plate of the sedimentation area is regularly washed, so that the influence of sludge adhesion on the inclined plate on the water outlet effect is prevented.

The ozone contact oxidation pond comprises an ozone contact oxidation pond body, an ozone diffuser, an ozone generator and an ozone destructor, wherein a water inlet of the ozone contact oxidation pond body is connected with a water outlet of the high-density sedimentation pond, the ozone generator is arranged on the upper side of the ozone contact oxidation pond body, the ozone diffuser is arranged in the ozone contact oxidation pond body, the ozone destructor is arranged on one side of the ozone contact oxidation pond body, the output end of the ozone destructor is connected with the outside, and a water outlet of the ozone contact oxidation pond body is connected with a water inlet of the multistage biological aeration filter.

Checking whether the pressure of the oxygen source boundary region is not higher than 0.5MPa, controlling the air inlet flow, adjusting the voltage and frequency of the ozone generator, producing ozone meeting the requirements, and ensuring the ozone adding effect and optimization, wherein the pressure of the oxygen source boundary region is not higher than 0.1 MPa. Checking the temperature of the ozone generator, and adjusting the pressure and flow of the internal and external circulating cooling water in time.

Checking the running condition of the ozone contact oxidation pond, adjusting the ozone adding amount, and ensuring that the water quality of the effluent meets the treatment requirement of the multistage biological filter.

And (3) analyzing COD of the water inlet and outlet of the ozone contact oxidation pond through sampling and assaying, and adjusting the ozone adding amount by an ozone online analyzer.

Checking whether the ozone tail gas contains foam and a large amount of water, and timely treating the ozone tail gas to avoid entering a destructor.

The effluent from the high-density sedimentation tank automatically flows to an ozone contact oxidation tank, and is in contact reaction with ozone, so that the biodegradability of sewage is improved. In the ozone contact tank, ozone gas is separated into numerous tiny bubbles by an ozone diffuser, so that the mass transfer process of ozone from gas phase to liquid phase is realized. The ozone adding amount can be proportionally adjusted according to the measured value of the water inflow. Oxygen required by the ozone generator is conveyed from outside the boundary by a liquid air company to a sewage pool company through a pipeline.

The retention time of sewage and ozone in the tank is not less than 1.5h, the stabilization time is not less than 1 h, and the requirements of improving the biodegradability of the sewage and removing part of COD are met.

The residual ozone tail gas is discharged from high altitude after being treated by the destructor, and can be sent to the deodorizing device by a tail gas conveying fan.

An ozone leakage detector is installed on site, the detection lower limit is lower than 0.15mg/m < 3 >, and the detection upper limit is higher than 0.3mg/m < 3 >.

The multistage biological aeration filter comprises a biological filter body, wherein a water inlet of the biological filter body is connected with a water outlet of an ozone contact oxidation pond body, the biological filter body is provided with four stages, each five stages are connected in series, the biological filter body comprises an aerobic section and an anoxic section, the first stage and the fifth stage are aerobic sections, the second stage to the fourth stage are anoxic sections, an aeration facility is arranged in each stage, a carbon source feeding system is further arranged on the biological filter body, and the water outlet of the biological filter body is connected with the water inlet of the high-efficiency biological reaction pond.

The multistage biological filter is arranged among 4 stages in parallel, each 5 stages are connected in series, wherein the 1 st stage and the 5th stage are aerobic sections, and dissolved oxygen is 2-4 mg/L, and the multistage biological filter is mainly used for removing the original COD in sewage and the excessive carbon source which is added in an anoxic section but not removed, and converting the carbon source and organic matters in the sewage into carbon dioxide and water. The 2-4 th level is an anoxic zone, the dissolved oxygen is controlled to be 0.2-0.5 mg/L, the anoxic zone is used for denitrification and inoculation of denitrifying bacteria, nitrate nitrogen and nitrite nitrogen in sewage are converted into nitrogen to escape from a water body under the action of the denitrifying bacteria, and TN is removed. In order to adapt to the water quality change of the inlet water, each stage is provided with an aeration facility, so that flexible switching under the anoxic and aerobic environment can be realized. The effective tank volume of the biological filter tank body is 1740m3, the COD removal load is 0.345kg COD/(m 3. D), and the total nitrogen removal load is 0.325 kg/(m 3. D). After treatment, COD is less than or equal to 70mg/L, TN is less than or equal to 10mg/L, in order to ensure that denitrification has sufficient carbon source, sodium acetate is added into the multistage biological filter as an external carbon source, and the sodium acetate is uniformly and intensively supplied by a sodium acetate adding facility between the adding medicines.

The multistage aeration biological filter shows the condition of total nitrogen of water inflow through an on-line analyzer AT-19009, ensures that the total nitrogen of water inflow is less than 10mg/L, calculates the dosage of sodium acetate, adjusts the water inflow balance of the multistage aeration biological filter, controls the aeration air quantity within a reasonable range, and ensures the further biodegradation of the organic pollutants after biochemical treatment. The numerical display of the effluent COD on-line analyzer AT-19010 is controlled within 70mg/L, and the filler layer of the aeration biological filter is regularly backwashed, so that the filtering performance is recovered and the activity of the biological membrane is improved.

The high-efficiency biological reaction tanks are provided with a plurality of groups, the high-efficiency biological reaction tanks of the plurality of groups are installed in parallel by adopting an upper backflow structure, special flora filter materials are arranged in the high-efficiency biological reaction tanks, an aeration device is arranged at the bottom of the high-efficiency biological reaction tanks, and a water outlet of the high-efficiency biological reaction tanks is connected with a water inlet of a filter cloth filter.

The high-efficiency biological reaction tanks are arranged among 6, run in parallel and adopt an upward flow structure. Under the aerobic condition in the reaction tank, the high-salt sewage is oxidized and adsorbed by special flora attached on the surface of the filter material and among the filter materials to remove the refractory organic matters in the water. The bottom of the reaction tank is provided with a perforated aeration pipe which is supplied with air by an aeration blower, the bottom of the reaction tank is also provided with a back-flushing filter head, and the back-flushing water is from a back-flushing water pump and the back-flushing air is from a back-flushing blower by adopting a gas-water combined back-flushing mode. COD of the effluent of the reaction tank is less than or equal to 30mg/L. Under the aerobic condition, COD in sewage is difficult to remove and is further biodegraded through high-efficiency biological contact oxidation, and finally endogenous substances of microorganisms are synthesized or used for metabolism, so that organic matters in the water are eliminated from the substances. After the technology is successfully used for film formation, even under the conditions of barren water inlet nutrition and no additional nutrition supplement source, the COD which is difficult to degrade in water can be used as an energy source for maintaining the stability and the bioactivity of bacteria, so that the COD in water can be continuously removed.

The special flora comprises at least one microorganism species selected from the group consisting of Bacillus, comamonas, arthrobacter, micrococcus, pseudomonas, pediococcus, achromobacter, flavobacterium, mycobacterium, flavobacterium, oligotrophic monad, and Yeast. Under aerobic conditions, the high-efficiency ABR complex functional flora utilizes the COD difficult to degrade in water as an energy source for maintaining the stability of functional bacteria, and organic matters in the sewage are further biodegraded to finally synthesize endogenous matters of microorganisms or be used for metabolism, so that the difficult-to-degrade organic pollutants in the water are fundamentally removed. The surface of the ABR carrier which is difficult to biodegrade COD water inflow is rich and stable in functional flora, and the biomass is more than 0.1mg/g carrier (based on dry weight).

The water inflow of the high-efficiency biological reaction tank is regulated well, the aeration air quantity is controlled within a reasonable range, and the further biodegradation of the organic pollutants after biochemical treatment is ensured. The COD of the water is within 30mg/L through sampling analysis.

The filter cloth filter comprises a plurality of groups of filter discs which are vertically and parallelly arranged in the device, the outside of the filter discs is wrapped with filter cloth, the average mesh diameter of the filter cloth is not more than 10 microns, and the water outlet of the filter cloth filter is connected with the water inlet of the monitoring pool.

The filter cloth filter mainly aims at further removing suspended matters, consists of a plurality of groups of filter discs which are vertically and parallelly arranged in the equipment, is wrapped outside the filter discs and is made of novel nanofiber materials, the average mesh diameter is not more than 10 microns, and the flux is high and impurities are not easy to adhere. The operation of the equipment comprises three states of filtering, cleaning and mud discharging. During filtration, sewage enters the filter through the water inlet weir plate, passes through the filter cloth under the action of gravity, enters the central rotary drum after filtration, and then flows out from the water outlet. With the progress of filtration, the material that the filter cloth was held back increases, and when the head loss through the filter cloth increased and reached the backwash liquid level of preset, the carousel need wash, and control system starts the backwash process, and after wasing, the back is accomplished, again through the short blowdown, and the filter cloth filter can resume normal filtration operation. When in cleaning, the filter cloth filter can continuously filter. The equipment is to be added with 10% sodium hypochlorite solution to prevent microbial fouling.

The filter cloth filter is cleaned by a backwashing water tank.

When the invention is used, firstly, the ABS device is drained, the wastewater neutralized by acid and alkali in the condensate water station and RO concentrated water in the sewage plant are drained into an adjusting homogenizing tank for homogenizing treatment; discharging the sewage in the regulating homogenizing tank into a high-density sedimentation tank, flocculating and settling the sewage by adding FeCL3 and PAM, discharging the settled sludge to a solid waste incineration device after settling and separating, and discharging the treated sewage into an ozone contact oxidation tank; the sewage is reacted with ozone in an ozone contact oxidation pond, the retention time of the sewage and ozone in the pond is not less than 1.5h, the stabilization time is not less than 1 h, the treated sewage is discharged into a multistage biological aerated filter, dissolved oxygen is 2-4 mg/L in an aerobic section of the multistage biological aerated filter, the main effect is to remove the original COD in the sewage and the excessive carbon source which is added but not removed in an anoxic section, the carbon source and the organic matters in the sewage are converted into carbon dioxide and water, the sewage is controlled to have 0.2-0.5 mg/L of dissolved oxygen in the anoxic section of the multistage biological aerated filter, the sewage is used for denitrification, denitrifying bacteria are inoculated, nitrate nitrogen and nitrite nitrogen in the sewage are converted into nitrogen under the action of denitrifying bacteria to escape from a water body, TN is removed, then the sewage is discharged into a high-efficiency biological reaction pond, the sewage enters a filter material position of the high-efficiency biological reaction pond, the refractory organic matters in the water are removed through oxidation and adsorption of an inter-bacterial flora, then the sewage filter cloth filter, the sewage enters a gravity water inlet plate into a filter, the sewage water pond is discharged into a special filter cloth to be discharged into a water tank through a monitoring drum to be discharged into a water tank after passing through a monitoring drum, the density of the water tank is discharged into a special filter cloth to be discharged out of the water tank after the water tank is monitored, the method reduces the consumption of the subsequent ozone, can remove TP in the sewage by adding ferric salt, is characterized in that the biodegradability of COD in RO concentrated water is very low, organic matters in the sewage are difficult to remove by adopting a biological method directly, so the B/C ratio of the sewage is firstly improved by adopting an ozone contact oxidation tank and a multistage biological aerated filter process, then COD and total nitrogen in the sewage are removed by adopting the multistage biological aerated filter, DO can be flexibly regulated and controlled by regulating the aeration amount of each stage of reactors in each tank body when the multistage biological aerated filter is operated, thereby the aerobic and anoxic environments are flexibly realized among each stage of reactors, the aim of simultaneously removing COD, ammonia nitrogen and total nitrogen is fulfilled, the high-efficiency biological reaction tank is specially developed for sewage with low load and poor biodegradability, and the high-efficiency biological reaction tank adopts special biological flora for nondegradable COD, and is inoculated on a special high-efficiency biological carrier to form a biological film which is stable and can tolerate a plurality of substrates as energy sources. Under the aerobic condition, COD in sewage is difficult to remove and is further biodegraded through high-efficiency biological contact oxidation, and finally endogenous substances of microorganisms are synthesized or used for metabolism, so that organic matters in the water are eliminated from the substances. After the technology is successfully used for film formation, even under the conditions of water-entering nutrition impoverishment and no additional nutrition source supplement, the COD which is difficult to degrade in water can be used as an energy source for maintaining the stability and the bioactivity of bacteria, so that the COD in water can be continuously removed.

It will be evident to those skilled in the art that the present invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and accordingly, the embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention, but any minor modifications, equivalents, and improvements made to the above embodiments according to the technical principles of the present invention should be included in the scope of the technical solutions of the present invention.

Claims (8)

1. High salt industrial sewage treatment plant, its characterized in that includes: the method comprises the steps of adjusting a homogenizing tank, a high-density sedimentation tank, an ozone contact oxidation tank, a multistage biological aeration tank, a high-efficiency biological reaction tank, a filter cloth filter and a monitoring water tank, wherein a water inlet of the homogenizing tank is drained through an ABS device, acid and alkali neutralization wastewater of a condensate station and RO concentrated water of a sewage plant are connected through a drainage pipeline, a water outlet of the homogenizing tank is connected with a water inlet of the high-density sedimentation tank, a water outlet of the high-density sedimentation tank is connected with a water inlet of the ozone contact oxidation tank, a water outlet of the ozone contact oxidation tank is connected with a water inlet of the multistage biological aeration tank, a water outlet of the multistage biological aeration tank is connected with a water inlet of the high-efficiency biological reaction tank, a water outlet of the high-efficiency biological reaction tank is connected with a water inlet of the filter cloth filter, a water outlet of the filter cloth filter is connected with a water inlet of the monitoring water tank, the monitoring water tank is drained through a water outlet, oil content is less than or equal to 1mg/L, SS is less than or equal to 10mg/L, TP is less than or equal to 0.3mg/L, ozone contact oxidation tank self-flows into high-salt biological PH6-9, water quality index of the multistage biological filter tank is less than or equal to 10mg/L, TN is less than or equal to 10mg/L, COD is less than or equal to 30mg/L, COD is less than or equal to 5mg/L, COD is less than or equal to the concentration of the high-concentration of suspended solid is discharged from the high-concentration biological filter tank is equal to or lower than 5 mg/1 mg/L.

2. The high-salt industrial sewage treatment device according to claim 1, wherein the high-density sedimentation tank comprises a coagulation area, a flocculation area, a sedimentation area, a clarification area, a reaction flow stabilizer, a solid waste incineration device and a dosing system, wherein the reaction flow stabilizer is arranged at the bottoms of the coagulation area and the flocculation area, the output end of the dosing system is connected with the coagulation area and the flocculation area, the water outlet of the clarification area is connected with the water inlet of the ozone contact oxidation tank, a mud scraper is arranged in the sedimentation area, sludge precipitated at the bottom of the sedimentation area is discharged into the solid waste incineration device through the mud scraper, a lifting facility is arranged in the reaction flow stabilizer of the flocculation area of the high-density sedimentation tank, the sewage forms an internal circulation flow state under the pushing of the sewage, the growth and uniformity of the flocculation are facilitated, a certain flow velocity is maintained by using strict hydraulic conditions, the formed flocculation is not broken, and the rapid separation can be realized after the sewage enters the sedimentation area.

3. The high-salt industrial sewage treatment device according to claim 2, wherein the ozone contact oxidation tank comprises an ozone contact oxidation tank body, an ozone diffuser, an ozone generator and an ozone destructor, wherein a water inlet of the ozone contact oxidation tank body is connected with a water outlet of the high-density sedimentation tank, the ozone generator is arranged on the upper side of the ozone contact oxidation tank body, the ozone diffuser is arranged in the ozone contact oxidation tank body, the ozone destructor is arranged on one side of the ozone contact oxidation tank body, an output end of the ozone destructor is connected with the outside, and a water outlet of the ozone contact oxidation tank body is connected with a water inlet of the multistage biological aeration filter.

4. The high-salinity industrial sewage treatment device according to claim 3, wherein the multistage biological aerated filter comprises a biological filter body, a water inlet of the biological filter body is connected with a water outlet of the ozone contact oxidation pond body, the biological filter body is provided with four stages, five stages are connected in series, the biological filter body comprises an aerobic stage and an anoxic stage, the first stage and the fifth stage are the aerobic stage, the second stage to the fourth stage are the anoxic stage, an aeration facility is arranged in each stage, a carbon source adding system is further arranged on the biological filter body, and the water outlet of the biological filter body is connected with the water inlet of the high-efficiency biological reaction pond.

5. The high-salt industrial sewage treatment device according to claim 4, wherein the high-efficiency biological reaction tanks are provided with a plurality of groups, the high-efficiency biological reaction tanks of the plurality of groups are arranged in parallel by adopting an upper reflux structure, special flora filter materials are arranged in the high-efficiency biological reaction tanks, an aeration device is arranged at the bottom of the high-efficiency biological reaction tanks, and a water outlet of the high-efficiency biological reaction tanks is connected with a water inlet of a filter cloth filter.

6. The high-salt industrial sewage treatment device according to claim 5, wherein the filter cloth filter comprises a plurality of groups of filter discs which are vertically and parallelly arranged in the equipment, the filter discs are wrapped with filter cloth, the average mesh diameter of the filter cloth is not more than 10 microns, and the water outlet of the filter cloth filter is connected with the water inlet of the monitoring pool.

7. The high salt industrial sewage treatment apparatus of claim 6 wherein the cloth filter is cleaned by a backwash basin.

8. The high-salt industrial sewage treatment process is characterized by comprising the following steps of:

S1, draining the ABS device, draining the acid-base neutralization wastewater of a condensate station and RO concentrated water of a sewage plant into an adjustment homogenizing tank, and homogenizing;

s2, discharging the sewage in the regulating homogenizing tank into a high-density sedimentation tank, flocculating and settling the sewage by adding FeCL3 and PAM, discharging the settled sludge to a solid waste incineration device after settling and separating, and discharging the treated sewage into an ozone contact oxidation tank;

s3, carrying out contact reaction on the sewage and ozone in an ozone contact oxidation pond, wherein the retention time of the sewage and the ozone in the pond is not less than 1.5 hours, the stabilization time is not less than 1 hour, and the treated sewage is discharged into a multistage biological aeration filter;

s4, the sewage passes through an aerobic section of the multistage biological aeration filter, dissolved oxygen is 2-4 mg/L, the main effect is to remove the original COD in the sewage and the excessive carbon source which is added in the anoxic section but not removed, the carbon source and the organic matters in the sewage are converted into carbon dioxide and water, the sewage passes through the anoxic section of the multistage biological aeration filter, the dissolved oxygen is controlled to be 0.2-0.5 mg/L for denitrification, denitrifying bacteria are inoculated, nitrate nitrogen and nitrite nitrogen in the sewage are converted into nitrogen under the action of the denitrifying bacteria to escape from a water body, TN is removed, and then the sewage is discharged into a high-efficiency biological reaction tank;

S5, enabling the sewage to enter a filter material position of the high-efficiency biological reaction tank, performing oxidation and adsorption through special flora among the filter materials to remove refractory organic matters in the water, and then discharging the sewage into a filter cloth filter;

s6, sewage enters a filter through a water inlet weir plate, passes through filter cloth under the action of gravity, enters a central rotary drum after being filtered, and then flows into a monitoring pool from a water outlet;

And S7, discharging the sewage in the monitoring pool after sampling is qualified.