KR100443691B1 - Waste Water Treatment System Using Chitosan Media - Google Patents

Abstract

The present invention relates to a wastewater treatment apparatus by a catalytic oxidation method, and in the present invention, in the wastewater treatment apparatus by a catalytic oxidation method including a sedimentation tank, a screen tank, a decay tank, a flow rate adjustment tank, a contact aeration tank, a precipitation tank, and a sterilization discharge tank, The contact aeration tank is filled with chitosan-coated chitosan contact material and is divided into four or more tanks so that the organic cistern in the waste water can be adsorbed and decomposed by bacteria cilia in the first tank, photosynthetic bacteria in the second tank, and algae after the third tank. Provided is a wastewater treatment apparatus using a chitosan contact material, which is made. The contact aeration tank constructed in accordance with the present invention has an excellent wastewater treatment effect by facilitating the adhesion of biofilm and contaminants on the chitosan contact material, thereby facilitating the digestion and decomposition of the contaminants. There is also an effect that can suppress the rise phenomenon.

Description

Wastewater Treatment System Using Chitosan Contact Material {Waste Water Treatment System Using Chitosan Media}

The present invention relates to a wastewater treatment apparatus by a catalytic oxidation method, and more particularly, to a wastewater treatment apparatus configured by dividing a contact aeration tank into four or more chambers and filling a contact material coated with chitosan having a cationic property thereto.

In general, there are biotreatment methods and physicochemical treatment methods for wastewater treatment systems. In particular, biotreatment methods are widely used for treating organic pollutants. This method is a method of efficiently utilizing the microorganism's decomposition ability and metabolic reaction by applying the natural self-cleaning action. Examples of biological treatment methods include activated sludge method, long-term aeration method, and contact treatment method. It consists of four stages of aeration tank, final sedimentation basin, and returning of activated sludge, and adds activated sludge, which has lived with bacteria, to eat organic matter in the drainage, and then precipitates the activated sludge by weight precipitation to discharge the supernatant water. However, this method has the disadvantages that the aeration operation acts as a major part of operation management, and the inconvenience of operation safety, processing efficiency, and maintenance difficulty, and that a professional technician must work all the time and require a large space. The long-term aeration method is a short-acting method of activated sludge method, which is characterized by longer aeration time, less BOD load, and higher suspended solids concentration in the aeration mixture than the standard method. There is no way.

Therefore, the contact treatment method has been developed as a method to solve this problem, unlike the above method is a method that does not need to return the sludge to the aeration tank. Such a contact treatment method attaches activated sludge to a variety of media on a rotating plate or a fixed yarn with a microbial membrane, and adsorbs and decomposes the microbial membrane by contacting organic matter in sewage. At this time, in order to supply oxygen necessary for the respiration of microorganisms, the rotating plate attaches oxygen in the air, and other methods are supplied by aeration. When the microbial film attached to the media becomes thick, the rotating plate is attached to the rotating shear. In other cases, it is a method of dropping off by aeration and treating by solid-liquid separation from the final settler.

Representative methods of such a method include a rotating disk contact method and a contact oxidation method. The treatment methods are considerably more advanced methods than the long-term aeration method of the activated sludge method, but they require a high level of skill in design and construction techniques. In other words,

(1) Prevention of adhesion of microorganisms by transmission force

(R.B.C (rotary disc contactor): rotation transfer force, other method: water hammer shear force by aeration)

(2) Material selection of media

(3) In the case of the R.B.C method, the rotation axis and mechanical load due to the final rotational end force of the disc. In particular, since the material composition of the media depends on the generation of surface microorganisms, which is the maximum requirement of activated sludge treatment, the leftmost nontoxic material components should be selected. In this case, the maximum resolution problem depends on the strength, permanence, and adhesion of the material.

Therefore, the reason why the above method is not an advanced method but is generally used is because it does not solve the problem of adhesion and detachment of media and active sludge.

On the other hand, the sedimentation tank installed in the system using the commonly used catalytic oxidation method removes traces of effluent and the accumulation of excess microbial membrane in the contact aeration tank without requiring the return of sludge as seen in the activated sludge method or the long-term aeration method. It is installed in order to prevent the deterioration of treated water quality due to the outflow by or the sludge outflow due to filter cleaning. However, due to the surface load applied to the sedimentation tank through the upper inflow of the treated water, rise of suspended solids causes deterioration of the quality of the discharged water, and in order to prevent the increase of the site and cost due to the expansion of the sedimentation tank capacity. I have a problem that's happening.

Therefore, in order to solve the above problems, in the present invention, four contact aeration tanks are provided so that the biofilm and contaminants can be smoothly adhered to the contact material of the contact aeration tank in the contact oxidation system, thereby facilitating the digestion and decomposition of the contaminants. It is an object of the present invention to provide a wastewater treatment apparatus coated with chitosan having a cationic property so that the above-described structure and the contact method by the surface area as well as the contact method by the charge can work together.

In the present invention, in the contact oxidation system, the sedimentation tank installed at the rear end of the contact aeration tank is replaced by the non-precipitating circulation method to introduce the treated water that has passed through the contact aeration tank to the bottom, and at the same time, the inflow water is sprayed back into the contact aeration tank. It is an object of the present invention to provide a wastewater treatment apparatus of a non-precipitating circulation system that can suppress a rise of suspended solids due to surface area load by circulating.

1 is a flow chart showing a wastewater treatment process of the non-precipitating circulation method of the present invention,

Figure 2 shows a schematic diagram of the wastewater treatment system of the non-precipitating circulation method of the present invention,

Figure 3 shows the principle of the circulation tank used in the wastewater treatment process of the present invention.

<Description of the symbols for the main parts of the drawings>

10: tide tank 20: screen tank

30: corruption tank 40: flow adjustment tank

50: contact aeration tank 60-1: treatment water circulation line

60: circulation tank 70: disinfection discharge tank

In order to achieve the above object, in the present invention, in the wastewater treatment apparatus by the contact oxidation method, including a sedimentation tank, screen tank, decay tank, flow adjustment tank, contact aeration tank, sedimentation tank and sterilization discharge tank, the contact aeration tank is chitosan It is filled with coated chitosan contact material and divided into 4 trillion or more, and chitosan, characterized in that it is made to adsorb and decompose organic matter contained in wastewater by bacterial cilia in the first tank, photosynthetic bacteria in the second tank, and algae after the third tank. Provided is a wastewater treatment apparatus using a contact material. In one embodiment of the present invention, the settling tank introduces the treated water that has passed through the contact aeration tank to the lower side and the treated water as a vortex phenomenon using the flow of the treated water introduced to the lower side. It operates in a non-precipitating circulation system in which sludge and suspended solids contained in the product are circulated back to the contact aeration tank without sedimentation. In the present invention, the sedimentation tank operated in the non-precipitating circulation method according to the present invention is referred to as "circulation tank".

Hereinafter, the chitosan contact member of the present invention will be described in detail.

Proper selection and use of contact materials used in wastewater treatment is the most important factor in determining the success or failure of the contact aeration method.

Recently, various types of contact materials, such as bioreta, biocue, or suspension microorganism contact method, have been used for the contact oxidation method, but the adhesion of microbial membranes due to aeration shear force, breakage of tangles of materials, and replacement of diffusers It is evaluated that various technical aspects should be reviewed, and in the case of setting up a survey of loads of organic matter, the amount of solid matter (SS) as well as BOD should be included as organic load in the case of living sewage. do.

Therefore, the present inventors studied a method for preventing the adhesion of microbial membranes and sludge detachment due to the aeration shear force in the contact aeration tank. As a result, the present inventors found that chitosan, which is present in nature and harmless to the human body, has a cationic (+) property. It became noticeable.

Chitosan is the only natural product that has the property of (+) ion with amino group (NH ²⁺ ). Amine groups of this cationic nature are likely to react with negative (-) ions. Interestingly, bacteria or viruses (-) ion, a carboxyl group (COO ^-) groups will easily got coupled meet with (+) ions in the chitosan polymer.

Therefore, when the chitosan is coated on the contact material, the microbial membranes adhered to the contact material do not fall off due to the material and properties of the contact material, and the surplus sludge is digested by digesting the surplus sludge in the inner layer of the attached sludge. Will not occur. In particular, the chitosan contact material of the present invention is formed in the form of a radioactive radioactively in water, exhibits a charge charge and actively adsorbs organic matter in sewage, so that adhesion of sludge and organic matter is good, so that the treatment efficiency of organic matter is high, and even low to high concentration sewage can be treated. Done. In addition, the chitosan contact material, in addition to the conventional contact method by the surface area, the contact method by the charge acts together can greatly improve the adhesion ability and desorption prevention of the microorganism.

Hereinafter, the wastewater treatment process of the non-precipitating circulation method using the chitosan contact material of the present invention will be described in detail with reference to one embodiment. (FIGS. 1 and 2)

In the wastewater treatment process of this embodiment, the planned wastewater amount was set to 100m ³ / day, and the BOD inflow rate was 200ppm and SS (floating material) inflow rate was 200ppm, so that both the discharged water quality of BOD and SS was 20ppm or less so that the removal rate was 90% or more. Designed.

Tide Tide (10)

Eliminates heavy contaminants in influent sewage. In other words, it removes sand, gravel, and metals from the water to prevent abrasion and closure of machinery and pipes such as pumps, and to accumulate in sedimentation tanks or sludge digesters to prevent degradation of treatment efficiency.

Screen Joe (20)

As the first step of water treatment, it is installed to prevent the damage of pump or mechanical equipment by removing coarse substances from various suspended substances contained in sewage flowing into sewage treatment plant.

Corruption (30)

Sedimentation and extinguishing proceed simultaneously in a tank, but the sedimentation and extinguishing chambers are not separated, and are designed to be capable of accepting excessive or intermittent loads.

Flow Adjustment Tank (40)

The main function is to store the incoming sewage once, prevent the inflow of contaminants and scum, and minimize the change of the flow rate and concentration of the water with the change of time. Some other functions are added during the process. The amount of sewage per hour was 1.5 / 24 times the average amount of sewage and the discharge time was assumed to be 12 hours so that the required capacity was 24.6m ³ .

Contact Aeration Tank (50)

It is a facility that injects and stirs the air (oxygen) necessary for the progress of biological reactions such as oxidation of organic substances by activated sludge, growth of sludge, and self-oxidation and removal of organic substances. In addition, as the chitosan contact material of the present invention is used to fill each chamber, it is to treat the organic material, heavy metals contained in the sewage in each tank divided into four chambers. That is, in the first tank, bacteria cilia, in the second tank, photosynthetic bacteria, and after the third tank, the organic matter is adsorbed and decomposed by algae to increase the treatment efficiency, and to remove nitrogen and phosphorus, which are difficult-to-dissolve BOD substances. The removal efficiency of such contaminants is further increased through the treatment water recycling of the treatment tank circulation line 60-1 of the circulation tank, which will be described later, so that the contact rate with the chitosan contacts is further increased. It can double the function of removing pollutants.

The effective capacity of the contact aeration tank and the length of the contact material are selected according to the following table 1.

Facility size (M ³ / day) Volume load (sum of BOD and SS) (KG / M ³ ) Load of suspension microbial contact (sum of removed BOD and SS) (8 / M days) Less than 100 0.5-0.8 5-8 100 to over 500 0.8-1.2 8-12 500 or more-less than 1000 1.2-1.5 12-16 More than 1000 1.5-2.0 16-25

Effective capacity of each group (we divide into four rooms or more)

Article 1: 40% Article 2: 30% Article 3, 4: 15%

Filling rate of contact material: more than 55%

Dissolved oxygen maintenance concentration in the tank: 1 PPM or more

Effective depth: 1.5 ~ 5M or less

Required capacity (calculated as volume load of BOD + SS)

Therefore, if you calculate the effective capacity of each room in the contact aeration tank

Room 1 32M ³ , Room 2 24M ³ , Room ³ 12M ³ , Room 4 12M ³

Given that the length of the contact material (removed BOD = 180PPM, removed SS = 180PPM)

The length of the contact material for each thread is

1st room: 1.800M, 2nd room 1.350M, 3rd room 0.675M, 4th room 0.675M.

Circulation tank (60)

It can prevent SS (floating material) and sludge injuries caused by the surface load of the conventional sedimentation tank, and in general, the process water is introduced from the bottom as shown in FIG. Even if some sludge flows into the tank, sludge flows back into the contact aeration tank due to the structural characteristics of the circulation tank. That is, it is a tank that has the function to manage the sludge and the suspended solids most stably by the vortex phenomenon using the flow of water in the aeration tank, and does not need the reducer, the sludge collector and the inner cylinder of the existing sedimentation tank.

Disinfection Disposal Tank (70)

It has a function of disinfecting and discharging treated water.

As described above, the chitosan contact material of the present invention is coated with chitosan having a cationic property on the existing contact material mainly for surface area improvement, so that the electrostatic force acts on the contact material, and the treatment water is moved by installing a circulation tank. By operating the route efficiently, you will:

① Maximize sludge adhesion to chitosan contact material.

② It can suppress the rise of suspended solids in effluent.

③ It is possible to improve the sedimentation to solve the capacity shortage of the settling tank.

④ It is possible to secure stable water quality by absorbing heavy metals discharged.

⑤ The pH is kept slightly acidic to minimize the pH load.

⑥ It can improve SV rise and sludge overflow caused by bulking and assetization.

Claims (3)

delete In the wastewater treatment apparatus by the catalytic oxidation method including a sedimentation tank, a screen tank, a decay tank, a flow regulating tank, a contact aeration tank, a precipitation tank and a sterilization discharge tank, The contact aeration tank is filled with chitosan-coated chitosan contact material and is divided into four or more tanks so that the organic cistern in the waste water can be adsorbed and decomposed by bacteria cilia in the first tank, photosynthetic bacteria in the second tank, and algae after the third tank. Wastewater treatment apparatus using a chitosan contact material, characterized in that made. The method of claim 2, The sedimentation tank is introduced into the lower portion of the treated water passed through the contact aeration tank, and the sludge and suspended solids contained in the treated water are circulated to the contact aeration tank without sedimentation as a vortex phenomenon using the flow of the treated water introduced into the lower portion. Waste water treatment apparatus, characterized in that operated in a manner.