CN112999882A - High-efficiency acidic cleaning agent for landfill leachate pollutants and application thereof - Google Patents
High-efficiency acidic cleaning agent for landfill leachate pollutants and application thereof Download PDFInfo
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- CN112999882A CN112999882A CN202110411608.3A CN202110411608A CN112999882A CN 112999882 A CN112999882 A CN 112999882A CN 202110411608 A CN202110411608 A CN 202110411608A CN 112999882 A CN112999882 A CN 112999882A
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- membrane
- cleaning agent
- landfill leachate
- cleaning
- acidic cleaning
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- 239000012459 cleaning agent Substances 0.000 title claims abstract description 44
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 28
- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 24
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 15
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 15
- 239000012528 membrane Substances 0.000 claims abstract description 102
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000004140 cleaning Methods 0.000 claims abstract description 57
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 230000004907 flux Effects 0.000 claims abstract description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 28
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 21
- 239000004094 surface-active agent Substances 0.000 claims abstract description 21
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 13
- 239000012498 ultrapure water Substances 0.000 claims abstract description 13
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 7
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 6
- 238000001728 nano-filtration Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims description 21
- 238000002360 preparation method Methods 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 claims 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 12
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 239000000126 substance Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- MTJGVAJYTOXFJH-UHFFFAOYSA-N 3-aminonaphthalene-1,5-disulfonic acid Chemical compound C1=CC=C(S(O)(=O)=O)C2=CC(N)=CC(S(O)(=O)=O)=C21 MTJGVAJYTOXFJH-UHFFFAOYSA-N 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000004021 humic acid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- BTURAGWYSMTVOW-UHFFFAOYSA-M sodium dodecanoate Chemical compound [Na+].CCCCCCCCCCCC([O-])=O BTURAGWYSMTVOW-UHFFFAOYSA-M 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 229940082004 sodium laurate Drugs 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a high-efficiency acidic cleaning agent for landfill leachate pollutants and application thereof. The weight components of the water-based cleaning agent comprise 2-5% of hydrochloric acid, 5-15% of citric acid, 3-21% of oxalic acid, 7-9% of surfactant and ultrapure water, wherein the weight ratio of the oxalic acid to the surfactant is (2-3) to 1. The acidic cleaning agent disclosed by the invention is mainly used for solving the pollution caused by one or more characteristics of rising of the operating pressure of a membrane core, lowering of the operating flux and lowering of the rejection rate of the membrane core due to the influence of inorganic and organic pollution in landfill leachate, heavy metal pollution, pollution caused by scale formation of calcium carbonate and calcium sulfate and pollution caused by scale formation of calcium carbonate and calcium sulfate. The acidic cleaning agent is used for cleaning an ultrafiltration membrane, a nanofiltration membrane and a reverse osmosis membrane used for treating the landfill leachate with less dosage, low temperature requirement, short cleaning time and good cleaning effect.
Description
Technical Field
The invention relates to the field of landfill leachate, in particular to a high-efficiency acidic cleaning agent for landfill leachate pollutants and application thereof.
Background
The pollution of the landfill leachate membrane treatment system is complex, the cleaning agent can not be cleaned by a common cleaning agent, the pollution of inorganic and organic pollutants, the pollution of heavy metals, the pollution of a plurality of humus and the scaling pollution of calcium carbonate and calcium sulfate are contained in the landfill leachate membrane treatment system. The common acidic cleaning agent in the market at present has the advantages of large addition amount, long cleaning time and high requirement on cleaning temperature, and causes certain influence on the field production efficiency.
Disclosure of Invention
The invention aims to provide an acid cleaning agent with less dosage, low temperature requirement, short cleaning time and good cleaning effect. Mainly aims at the pollution caused by the phenomenon of one or more characteristics of the rising of the operating pressure of the membrane core, the decline of the operating flux and the decline of the retention rate of the membrane core due to the influence of inorganic substances such as calcium and magnesium ions in the landfill leachate.
In order to achieve the aim, the invention provides a high-efficiency acidic cleaning agent for landfill leachate pollutants, which is characterized by comprising 2-5% of hydrochloric acid, 5-15% of citric acid, 3-21% of oxalic acid, 7-9% of surfactant and ultrapure water by weight, wherein the weight ratio of the oxalic acid to the surfactant is (2-3): 1.
Further, the preparation method comprises the steps of taking ultrapure water as a solvent, sequentially adding citric acid, a surfactant, oxalic acid and hydrochloric acid into the ultrapure water, and stirring while adding; stirring continuously to make the solution clear and transparent, and completely dissolving the raw materials.
The invention also protects the application of the acidic cleaning agent in cleaning inorganic substance pollution of a membrane core in membrane separation equipment for treating landfill leachate.
Further, the membrane core is an ultrafiltration membrane, a nanofiltration membrane or a reverse osmosis membrane used for treating the landfill leachate.
Further, the pollution is a phenomenon that at least one characteristic of the rising of the operation pressure of the membrane core, the reduction of the operation flux and the reduction of the rejection rate of the membrane core is caused by the influence of organic matters in the landfill leachate.
Further, the using step is that pure water with half volume of the CIP tank is added into the CIP tank of the membrane separation equipment, and the equipment is started to be in an online cleaning mode; slowly adding the acidic cleaning agent in claim 1 into the CIP tank for multiple times in a small amount, wherein the pH needs to be detected after each addition until the pH reaches 3.2-3.7; after 5-15 minutes of cleaning, the pH value needs to be checked again, and if the pH value exceeds 3.7, the acidic cleaning agent needs to be added continuously; and (3) until the flux of the membrane core is stable or slightly reduced, gradually cleaning the color of the cleaning solution, and then washing the equipment by using pure water until the pH of the washing water is close to 7 and the pure water flux is recovered to be before the new membrane is used, and finishing the washing.
Further, the pure water is water with the hardness of less than 1; preferably, the pure water is reverse osmosis produced water.
Further, the acidic cleaning agent is heated to a temperature of 30-45 ℃ before being added.
Further, the acidic cleaning agent is heated to 30-40 ℃ before being added.
The membrane core of the invention refers to an ultrafiltration membrane, a nanofiltration membrane, a reverse osmosis membrane and the like used for treating landfill leachate. When the cleaning is carried out, the temperature of the acidic cleaning solution exceeds 45 ℃ and can cause irreversible influence on the service life of the membrane core, and the temperature is lower than 30 ℃ and can influence the cleaning effect, so that the cleaning time needs to be prolonged. In consideration of the cleaning effect, cost and working efficiency, the acidic cleaning solution can also be heated to the temperature of 30-40 ℃ for cleaning.
The invention adopts 2-5% hydrochloric acid to be matched with 5-15% citric acid for use, so as to improve the acidity of the whole cleaning agent, in the process of cleaning agent of citric acid, pollutants can be effectively combined with the citric acid, hydrochloric acid is not allowed to exceed 5%, and after the hydrochloric acid exceeds 5%, the acidity is too large, thus being not beneficial to the content of other substances and the tolerance of the system; less than 2 percent is not allowed, less than 2 percent cannot be used together with citric acid, and better combination of pollutants and citric acid cannot be achieved; the citric acid is not less than 5 percent, and the total amount is insufficient after the citric acid is less than 5 percent, so that the cleaning is not thorough. 3-21% oxalic acid is used in combination with 7-9% surfactant, wherein the weight ratio of oxalic acid to penetrant is (2-3: 1, preferably 2.5: 1; the humic acid-containing composite film mainly plays roles in stripping and delaminating between pollutants and contaminated substances, plays a role in complexing heavy metals and other inorganic substances, and can effectively form a complex to be removed after the humic acid and a film material are polymerized.
The acidic cleaning agent disclosed by the invention is mainly used for cleaning pollution caused by pollutants in landfill leachate, recovering the flux performance of the membrane core and the water yield of a system; the cleaning water has higher compatibility with the cleaning water temperature, and can meet the requirement of efficient cleaning under the room temperature condition; the dosage of the cleaning agent is less; the cleaning of the membrane core pollutants is more efficient, and the performance of the membrane core is not damaged.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative of the invention and is not to be construed as limiting the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
The surfactant in the following examples may be AES, sodium dodecylbenzene sulfonate or sodium laurate.
Example 1: preparation and use of acidic cleaning agent
Raw materials: the components by weight comprise 2% of hydrochloric acid, 15% of citric acid, 9% of surfactant, 18% of oxalic acid and ultrapure water. Wherein the weight ratio of oxalic acid to surfactant is about 2: 1.
The preparation method comprises the following steps: preparing ultrapure water as a solvent; sequentially adding citric acid, a surfactant, oxalic acid and hydrochloric acid, and stirring while adding; stirring for 30 min to make the solution clear and transparent, and dissolving the raw materials completely.
Cleaning: the membrane of the first section of the membrane separation equipment with the membrane core being the ultrafiltration membrane. The membrane is used for treating pollutants of landfill leachate (such as scaling pollution of calcium carbonate and calcium sulfate), the membrane operation flux of the membrane is 80% of the flux before the membrane operates, and the membrane core operation pressure is doubled compared with the membrane pressure before the membrane operates.
Adding pure water with a volume which is half that of the CIP tank into the CIP tank of the membrane separation equipment, and starting an online cleaning mode of the equipment; slowly adding a small amount of 30 ℃ acidic cleaning agent into the CIP tank for multiple times, wherein the pH needs to be detected after each addition until the pH reaches 3.2-3.7; after cleaning for 10 minutes, the pH value needs to be checked again, and if the pH value exceeds 3.7, the acidic cleaning agent needs to be added continuously; and (3) until the flux of the membrane core is stable or slightly reduced, gradually cleaning the color of the cleaning solution, and then washing the equipment by using pure water until the pH of the washing water is close to 7 and the pure water flux is recovered to be before the new membrane is used, and finishing the washing. The operation flux of the cleaned membrane reaches 100% of that of the membrane before operation, and the pressure is also recovered to that of the membrane before operation.
Example 2: preparation and use of acidic cleaning agent
Raw materials: the components by weight comprise 5% of hydrochloric acid, 10% of citric acid, 7% of surfactant, 21% of oxalic acid and ultrapure water. Wherein the weight ratio of oxalic acid to surfactant is about 3: 1.
The preparation method comprises the following steps: the same as in example 1.
Cleaning: the membrane of the first section of the membrane separation equipment with the membrane core being the ultrafiltration membrane. The membrane is used for treating pollutants of landfill leachate (such as scaling pollution of calcium carbonate and calcium sulfate), the membrane operation flux of the membrane is 80% of the flux before the membrane operates, and the membrane core operation pressure is doubled compared with the membrane pressure before the membrane operates.
Adding half volume of pure water into a CIP tank of the membrane separation equipment, and starting an online cleaning mode of the equipment; slowly adding a small amount of 40 ℃ acid cleaning agent into the CIP tank for multiple times, wherein the pH needs to be detected after each addition until the pH reaches 3.2-3.7; after about 10 minutes of cleaning, the pH value needs to be checked again, and if the pH value exceeds 3.7, the cleaning agent needs to be added continuously; and (3) until the flux of the membrane core is stable or slightly reduced, gradually cleaning the color of the cleaning solution, and then washing the equipment by using pure water until the pH of the washing water is close to 7 and the pure water flux is recovered to be before the new membrane is used, and finishing the washing. The operation flux of the cleaned membrane reaches 100% of that of the membrane before operation, and the pressure is also recovered to that of the membrane before operation.
Example 3: preparation and use of acidic cleaning agent
Raw materials: the components by weight comprise 3% of hydrochloric acid, 10% of citric acid, 8% of surfactant, 20% of oxalic acid and ultrapure water. Wherein the weight ratio of oxalic acid to surfactant is about 2.5: 1.
The preparation method comprises the following steps: the same as in example 1.
Cleaning: the membrane of the first section of the membrane separation equipment with the membrane core being the ultrafiltration membrane. The membrane is used for treating pollutants of landfill leachate (such as scaling pollution of calcium carbonate and calcium sulfate), the membrane operation flux of the membrane is 80% of the flux before the membrane operates, and the membrane core operation pressure is doubled compared with the membrane pressure before the membrane operates.
Adding a proper amount of pure water into a CIP tank of the membrane separation equipment, and starting an online cleaning mode of the equipment; slowly adding a small amount of 35 ℃ acid cleaning agent into the CIP tank for multiple times, wherein the pH needs to be detected after each addition until the pH reaches 3.2-3.7; after about 10 minutes of cleaning, the pH needs to be checked again, and if the pH value exceeds 3.7, the cleaning agent needs to be added continuously; and (3) until the flux of the membrane core is stable or slightly reduced, gradually cleaning the color of the cleaning solution, and then washing the equipment by using pure water until the pH of the washing water is close to 7 and the pure water flux is recovered to be before the new membrane is used, and finishing the washing. The operation flux of the cleaned membrane reaches 100% of that of the membrane before operation, and the pressure is also recovered to that of the membrane before operation.
Comparative example 1: preparation of cleaning agent and cleaning thereof
Raw materials: the components by weight comprise 1% of hydrochloric acid, 16% of citric acid, 7% of surfactant, 10% of oxalic acid and ultrapure water. Wherein the weight ratio of oxalic acid to surfactant is about 1.4: 1.
The preparation method comprises the following steps: the same as in example 1.
Cleaning:
adding a proper amount of pure water into a CIP tank of the membrane separation equipment, and starting an online cleaning mode of the equipment; slowly adding a small amount of 35 ℃ cleaning agent into the CIP tank for multiple times, wherein the pH needs to be detected after each addition until the pH reaches 3.2-3.7; after cleaning for a period of time, the pH value needs to be checked again, and if the pH value exceeds 3.7, the cleaning agent needs to be added continuously; and (3) until the flux of the membrane core is stable or slightly reduced, gradually cleaning the color of the cleaning solution, and then washing the equipment by using pure water until the pH of the washing water is close to 7 and the pure water flux is recovered to be before the new membrane is used, and finishing the washing. The operation flux of the cleaned membrane reaches 85-90% of that of the membrane before operation, and the pressure is reduced to 1.5 times of that of the membrane before operation.
Comparative example 2: preparation of cleaning agent and cleaning thereof
Raw materials: the components by weight comprise 6% of hydrochloric acid, 10% of citric acid, 2.5% of surfactant, 10% of oxalic acid and ultrapure water. Wherein the weight ratio of the oxalic acid to the surfactant is 4: 1.
The preparation method comprises the following steps: the same as in example 1.
Cleaning:
adding a proper amount of pure water into a CIP tank of the membrane separation equipment, and starting an online cleaning mode of the equipment; slowly adding a small amount of 50 ℃ cleaning agent into the CIP tank for multiple times, wherein the pH needs to be detected after each addition until the pH reaches 3.2-3.7; after cleaning for a period of time, the pH value needs to be checked again, and if the pH value exceeds 3.7, the cleaning agent needs to be added continuously; and (3) until the flux of the membrane core is stable or slightly reduced, gradually cleaning the color of the cleaning solution, and then washing the equipment by using pure water until the pH of the washing water is close to 7 and the pure water flux is recovered to be before the new membrane is used, and finishing the washing. The operation flux of the cleaned membrane reaches 60-70% of that of the membrane before operation, and the pressure is increased to 1.1 times of that of the membrane before operation. Since the addition of the cleaning agent is itself a contamination.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
1. The high-efficiency acidic cleaning agent for the landfill leachate pollutants is characterized by comprising 2-5% of hydrochloric acid, 5-15% of citric acid, 3-21% of oxalic acid, 7-9% of surfactant and ultrapure water by weight, wherein the weight ratio of the oxalic acid to the surfactant is (2-3) to 1.
2. The efficient acidic cleaning agent for landfill leachate pollutants as claimed in claim 1, wherein the preparation method comprises the steps of using ultrapure water as a solvent, sequentially adding citric acid, a surfactant, oxalic acid and hydrochloric acid into the ultrapure water while stirring; stirring continuously to make the solution clear and transparent, and completely dissolving the raw materials.
3. Use of the acidic cleaning agent according to claim 1 for cleaning inorganic contamination of membrane cores in membrane separation plants for the treatment of landfill leachate.
4. The use according to claim 3, wherein the membrane core is an ultrafiltration membrane, a nanofiltration membrane or a reverse osmosis membrane for the treatment of landfill leachate.
5. Use according to claim 3, wherein the pollution is a phenomenon characterized by at least one of an increase in membrane core operating pressure, a decrease in operating flux, and a decrease in membrane core rejection rate, as a result of the organic matter in the landfill leachate.
6. The use according to claim 3, wherein the using step is that pure water of half the volume of the CIP tank is added into the CIP tank of the membrane separation equipment, and the equipment is opened to an online cleaning mode; slowly adding the acidic cleaning agent in claim 1 into the CIP tank for multiple times in a small amount, wherein the pH needs to be detected after each addition until the pH reaches 3.2-3.7; after 5-15 minutes of cleaning, the pH value needs to be checked again, and if the pH value exceeds 3.7, the acidic cleaning agent needs to be added continuously; and (3) until the flux of the membrane core is stable or slightly reduced, gradually cleaning the color of the cleaning solution, and then washing the equipment by using pure water until the pH of the washing water is close to 7 and the pure water flux is recovered to be before the new membrane is used, and finishing the washing.
7. Use according to claim 6, wherein the pure water is water with a hardness of less than 1; preferably, the pure water is reverse osmosis produced water.
8. Use according to claim 6, wherein the acidic cleaning agent is heated to a temperature of 30-45 ℃ prior to addition.
9. Use according to claim 8, wherein the acidic cleaning agent is heated to a temperature of 30-40 ℃ prior to addition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110411608.3A CN112999882A (en) | 2021-04-16 | 2021-04-16 | High-efficiency acidic cleaning agent for landfill leachate pollutants and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226339A (en) * | 2021-12-10 | 2022-03-25 | 安徽中环环保科技股份有限公司 | Rubbish leachate system scale removal integrated device |
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