CN114249509A - Chemical cleaning and sewage treatment process for reverse osmosis membrane - Google Patents
Chemical cleaning and sewage treatment process for reverse osmosis membrane Download PDFInfo
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- CN114249509A CN114249509A CN202210183192.9A CN202210183192A CN114249509A CN 114249509 A CN114249509 A CN 114249509A CN 202210183192 A CN202210183192 A CN 202210183192A CN 114249509 A CN114249509 A CN 114249509A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
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- 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
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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- 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
- B01D2321/164—Use of bases
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- 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
- B01D2321/168—Use of other chemical agents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2305/02—Specific form of oxidant
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Abstract
The invention discloses a chemical cleaning and sewage treatment process of a reverse osmosis membrane, relating to the field of sewage treatment, wherein the cleaning step comprises the sub-steps of membrane element detection, acid cleaning, surfactant cleaning, water cleaning and post-cleaning detection; the sewage treatment comprises the following steps: the flocculant comprises a coagulant, a chelating agent and a chelating agent, wherein the coagulant comprises one or more of polyaluminium chloride, polyaluminium sulfate, polyferric sulfate and polyferric chloride, the chelating agent comprises one or more of EDTA-2Na, alpha-sodium glucoheptonate and EDTA-4Na, and the component of the flocculant is polyacrylamide; the chemical cleaning and sewage treatment process of the reverse osmosis membrane can effectively remove heavy metals in sewage, prevents nitrate radicals and heavy metal ions in the sewage after the reverse osmosis membrane is cleaned from polluting the environment, has high treatment efficiency and good treatment effect, and can effectively treat the cleaning sewage.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a chemical cleaning and sewage treatment process of a reverse osmosis membrane.
Background
In the operation process of the reverse osmosis system, heavy metal ions, microorganisms, particles which are not easy to dissolve, organic pollutants, bacterial microorganisms and other substances in water are contacted with the membrane for a long time and are gathered on the surface of the membrane, so that the flux and the separation performance of the membrane are obviously reduced, therefore, the fouling blocking membrane needs to be replaced, and the disassembled fouling blocking membrane removes inorganic matters, organic dirt and microorganism adsorption layers through physical and chemical methods such as dissolution, sterilization, descale and the like to obtain a new reverse osmosis membrane.
After the existing chemical cleaning process is finished, nitric acid is used for assisting in removing heavy metals, and the cleaned sewage contains nitrate radicals and heavy metal ions, so that great treatment difficulty is brought to subsequent harmless treatment of the sewage, and the sewage treatment process is required to be convenient for subsequent sewage purification and discharge.
Disclosure of Invention
The invention aims to provide a chemical cleaning and sewage treatment process of a reverse osmosis membrane, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a chemical cleaning process of a reverse osmosis membrane comprises the following steps:
1) performing element analysis on the fouling: collecting dirt blocking objects on the surface of the membrane element, analyzing the components of the dirt blocking objects and judging the type of the dirt;
2) determining the type and proportion of the fouling: collecting and analyzing the dirt in the on-site dirt blocking membrane, judging the general components and accurate content of the dirt through analysis, and further selecting and making a corresponding cleaning scheme;
3) and (3) carrying out single membrane cleaning test by a small test machine: preparing a cleaning solution according to the determined cleaning scheme, then cleaning in a single-membrane test machine, finely adjusting the cleaning solution in the cleaning process and optimizing the cleaning scheme;
4) large-scale cleaning: soaking a membrane element with high heavy metal and calcium sulfate content in dirt by using a cleaning agent, wherein the agent contains a component which is easily complexed with calcium ions, and after the membrane element is fully soaked, a calcium sulfate crystal body is disintegrated and taken out to be installed in a membrane cleaning device;
5) the first-stage acid washing process comprises the following steps: opening a valve of a pickling barrel, pickling, after the reaction is finished, opening an ultrasonic generator, adjusting the water inlet pressure of a cleaning water pump to 1Mpa, circularly cleaning, and stopping pickling when the pressure difference between the front and the back of the membrane is less than or equal to 0.05 Mpa;
6) the second stage alkali washing process comprises the following steps: opening a valve of an alkaline washing water barrel, adjusting the pH of alkaline water to 10-11 by using sodium hydroxide, adding a small amount of surfactant and chelating agent according to the dirt condition, opening an ultrasonic generator, and taking out a membrane element after cleaning;
7) and (3) detection and cleaning at the third stage: opening a valve of a brine barrel for detecting, adjusting the conductivity of brine to 1000 mu S/m by using sodium chloride, opening a water inlet pump, adjusting the pressure of brine in front of a membrane to 1MPa, reading the conductivity behind the membrane by using an online conductivity measuring instrument behind the membrane, calculating and removing the desalination rate according to a formula (desalination rate = 1-pure water conductivity behind the membrane/brine conductivity in front of the membrane), and converting and calculating the yield and the yield of pure water according to a pure water flowmeter behind the membrane and a concentrated water flowmeter;
8) and fourth-stage tap water sodium bisulfite cleaning: and after the detection and cleaning are finished, simple running water circulation is carried out on the membrane element.
On the basis of the technical scheme, the invention also provides the following optional technical scheme:
in one alternative: in the step 5), the formula of the acid washing agent is as follows: 0.5% of oxalic acid, 0.5% of citric acid and 0.05% of hydrochloric acid.
In one alternative: in the step 6), the alkaline cleaning agent formula is as follows: 0.05% of sodium hydroxide, 0.05% of potassium hydroxide, 0.05% of sodium dodecyl benzene sulfonate and 0.05% of sodium dodecyl sulfate.
A sewage treatment process comprises the following steps:
1) air flotation: introducing sewage into an air flotation device, carrying macromolecular organic matters to the surface of the air flotation device through bubbles generated by the air flotation device, and carrying out carbonization and incineration treatment on scum at the bottom of the air flotation device and activated sludge after the scum is concentrated;
2) flocculation, chelation and sedimentation: adding a coagulant, a metal chelating agent and a flocculant into an aqueous solution according to a certain proportion, condensing organic matters, suspended matters SS and heavy metal ions in sewage into a charged colloidal state, adding the flocculant to perform complexing, settling and separating the colloidal state, concentrating the sewage and sediments generated by the flocculant, and performing carbonization and incineration treatment on the sewage and activated sludge;
3) hydrolysis and acidification: hydrolyzing and acidifying organic matters in water through the cultured hydrolytic acidification zymophyte to generate micromolecule acids and serve as a carbon source for nitrate denitrification;
4) AO biochemistry: sewage is injected into a tank A and a tank O in sequence for AO biochemical treatment, nitrate radical in the sewage is denitrified into nitrogen in the tank A, the denitrification is enhanced by adopting a film-forming method, COD is degraded into CO in the tank O2；
5) Fenton reaction: and (3) injecting the treated purified water into a secondary sedimentation tank for sedimentation and standing, generating a large amount of hydroxyl free radicals after the sewage undergoes Fenton reaction, oxidizing and breaking chains of organic matters which are difficult to be biochemically in the water, and generating degradable organic matters.
In one alternative: in the step 2), the coagulant comprises one or more of polyaluminium chloride, polyaluminium sulfate, polyferric sulfate and polyferric chloride.
In one alternative: in the step 2), the chelating agent comprises one or more of EDTA-2Na, alpha-glucoheptonate and EDTA-4Na, and the flocculating agent is polyacrylamide.
In one alternative: in the step 4), the sewage is injected into the tank A and stays for 8 hours, and the tank A is in an anoxic environment.
Compared with the prior art, the invention has the following beneficial effects:
the chemical cleaning and sewage treatment process of the reverse osmosis membrane can effectively remove heavy metals in sewage, prevents nitrate radicals and heavy metal ions in the sewage after the reverse osmosis membrane is cleaned from polluting the environment, has high treatment efficiency and good treatment effect, and can effectively treat the cleaning sewage.
Drawings
FIG. 1 is a flow diagram of a cleaning process for chemically cleaning a reverse osmosis membrane.
FIG. 2 is a flow chart of a sewage treatment process after chemical cleaning of a reverse osmosis membrane.
Notations for reference numerals: 1-water bucket, 2-ball valve, 3-membrane bucket, 4-ultrasonic vibration plate, 5-multistage centrifugal pump, 6-flowmeter, 7-online conductivity meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
As shown in fig. 1, a chemical cleaning process for a reverse osmosis membrane according to an embodiment of the present invention includes the following steps:
1) performing element analysis on the fouling: under the condition of ensuring that the membrane material is not insoluble, the original treatment effect of the membrane element is recovered as much as possible, the dirt blocking object on the surface of the membrane element is directly derived from the treated source water, the concentrations and the types of inorganic matters, organic matters, suspended matters, microorganisms and heavy metals in the source water are closely related to the dirt blocking object on the surface of the membrane, and the dirt blocking degree and the dirt blocking object component difference of the membrane element introduced by different manufacturers are large, so that the type of the dirt can be roughly qualitatively judged by knowing the source water in contact with the membrane element;
2) determining the type and proportion of the fouling: in order to ensure the effectiveness and pertinence of the off-line cleaning technical scheme, the dirt in the on-site dirt blocking membrane is collected and analyzed, the type and proportion condition of the dirt blocking object is determined, the general components and accurate content of the dirt can be basically determined through the analysis, and then a corresponding cleaning scheme is selected and made, and the membrane surface dirt component analysis method comprises the following steps:
3) and (3) carrying out single membrane cleaning test by a small test machine: preparing a cleaning solution according to the determined cleaning scheme, cleaning in a single-membrane test machine, finely adjusting the cleaning solution in the cleaning process, verifying the effect of the cleaning scheme formulated at the early stage, and simultaneously optimizing the final cleaning scheme;
4) large-scale cleaning: soaking membrane elements with high heavy metal and calcium sulfate content in dirt with a cleaning agent, wherein two containers are soaked, more than 20 containers can be filled in each container, the medicament contains components which are easy to complex with calcium ions, and after 12 hours of full soaking, calcium sulfate crystals are disintegrated and taken out to be installed in a membrane cleaning device;
5) the first-stage acid washing process comprises the following steps: opening a valve of a pickling barrel, wherein the pickling speed is high, because the residual heavy metal and inorganic salt scale are matched with a non-oxidation type bactericide under the acidic condition of low-concentration nitric acid and the like, the reaction speed is very high, the theoretical reaction time is within 15 minutes, opening an ultrasonic generator, opening a cleaning water pump, adjusting the water inlet pressure to 1Mpa for circular cleaning, and stopping pickling when the pressure difference between the front and the back of the membrane is less than or equal to 0.05 Mpa. The membrane elements after acid washing are placed for a period of time and basically contain no alkaline cleaning solution, and the cleaning capacity of the acidic cleaning solution is reduced when the membrane elements accumulate to about 100. Starting to carry out the second stage of alkaline cleaning solution cleaning;
6) the second stage alkali washing process comprises the following steps: opening a valve of an alkaline washing water barrel, adjusting the pH of alkaline water to 10-11 by using sodium hydroxide, adding a small amount of surfactant and a chelating agent which is easy to generate a matching action with metal ions according to the dirt condition, opening an ultrasonic generator, starting a pump to circularly clean for 1.5 hours, intermittently cleaning by pulses in the middle, and taking out a cleaned membrane element;
7) and (3) detection and cleaning at the third stage: opening a valve of a brine barrel for detecting, adjusting the conductivity of brine to 1000 mu S/m by using sodium chloride, opening a water inlet pump to adjust the pressure of brine before a membrane to be 1MPa, reading the conductivity after the membrane by an online conductivity measuring instrument after the membrane, calculating and removing the desalination rate according to a formula (desalination rate = 1-pure water conductivity after the membrane/brine before the membrane), and converting and calculating the yield and the yield of pure water according to a pure water flowmeter after the membrane and a concentrated water flowmeter;
8) and fourth-stage tap water sodium bisulfite cleaning: and after the detection and cleaning are finished, simply circulating tap water for 3-5 minutes, and often adding 100PPM sodium bisulfite into the tap water to stabilize the pH value of the membrane after delivery.
The formula of the pickling agent used in cleaning comprises: 0.5 percent of oxalic acid, 0.5 percent of citric acid and 0.05 percent of hydrochloric acid, if heavy metals need to be removed, 0.05 percent of nitric acid is used for replacing the hydrochloric acid, and the PH2-3 of the pickling agent is maintained; alkali washing: one or more of 0.05% of sodium hydroxide, 0.05% of potassium hydroxide, 0.05% of sodium dodecyl benzene sulfonate and 0.05% of sodium dodecyl sulfate, and if heavy metal needs to be removed, 1.5% of EDTA-4Na1 needs to be added to chelate the heavy metal ions after dissolution; non-oxidizing biocides: one or more of dibromocyanoacetamide 200PPM, isothiazolinone 200PPM, and sodium hypochlorite (low concentration) 100 PPM.
Ultrasonic cavitation: the micro bubble nucleus in the liquid generates vibration under the action of ultrasonic wave, when the sound pressure reaches a certain value, the bubble rapidly expands and then is suddenly closed, and when the bubble is closed, shock wave is generated, and a series of dynamic processes such as expansion, closing, oscillation and the like are called ultrasonic cavitation. When the ultrasonic energy is high enough, the phenomenon of ultrasonic cavitation is generated. The micro bubbles (cavitation nuclei) existing in the liquid vibrate, grow and continuously gather the energy of a sound field under the action of an ultrasonic field, and when the energy reaches a certain threshold value, the cavitation bubbles are rapidly collapsed and closed. The lifetime of the bubble is about 0.1. mu.s, which releases a large energy in the event of a sharp collapse and generates a microjet with a velocity of about 110m/s and a strong impact force, with a collision density of up to 1.5kg/cm 2. The phenomenon that bubbles generate local high temperature and high pressure (5000K, 1800 atm) at the moment of rapid collapse, and the cooling speed can reach 9 times K/s of 10.
The small bubbles formed by cavitation will move, grow or suddenly disappear with the vibration of the surrounding medium. When the liquid is broken, the surrounding liquid suddenly rushes into bubbles to generate high temperature and high pressure, and simultaneously shock waves are generated. Internal friction associated with cavitation can create electrical charges and create a glow phenomenon within the bubble due to electrical discharge. The technique of sonication in a liquid is mostly associated with cavitation. Cavitation generally comprises 3 stages: formation, growth and violent collapse of cavitation bubbles. When a container filled with liquid is introduced with ultrasonic waves, tens of thousands of tiny bubbles, namely cavitation bubbles, are generated due to the vibration of the liquid. These bubbles grow in the negative pressure zone formed by the longitudinal propagation of the ultrasound waves and rapidly close in the positive pressure zone, thus being compressed and stretched under alternating positive and negative pressures. At the moment the bubble is compressed until collapse, a large instantaneous pressure is generated, typically up to tens to hundreds of mpa. Sufficient shaking stirring force is formed, so that the dirt attached to the membrane is desorbed and separated.
The barreled medium and the detection calculation method comprise the following steps: the media in the five buckets 1 are respectively as follows: bactericide, oxalic acid, citric acid, hydrochloric acid/nitric acid, sodium hydroxide/potassium hydroxide and EDTA, saline water, pure water and sodium bisulfite; multistage centrifugal pump 5: and (4) carrying out corrosion resistance, wherein the lift is 15m, and the flow is 50 m/h. An online pressure gauge, an online conductivity tester 7 and a flowmeter 6 are respectively arranged in front of and behind the membrane and used for calculating the desalination rate and the water yield of the reverse osmosis membrane. A water passing pipe is arranged between the water barrel 1 and the membrane barrel 3, a ball valve 2 is arranged on the water passing pipe, and an ultrasonic vibration plate 4 is arranged outside the membrane barrel 3; salt rejection = 1-pure water conductivity after membrane/brine conductivity before membrane; the water yield = the flow of the pure water flowmeter at the water inlet pressure of 1 MPa; water yield = pure water flow after membrane/water flow before membrane (water inlet pressure 1 MPa); cleaning time: when the pressure difference of the pressure gauge before and after the membrane is less than 0.05MPa, the cleaning is defined to be finished; and (3) qualified detection: and (3) replacing pure water with brine, starting a pump to operate, and when the desalination rate is more than or equal to 95% and the water yield is more than or equal to 1t/h, determining that the cleaning is qualified and the product can leave the factory.
A sewage treatment process comprises the following steps:
1) air flotation: introducing sewage into an air flotation device, bringing macromolecular organic matters to the surface of the air flotation device through bubbles generated by the air flotation device, concentrating floating slag at the bottom of the air flotation device, and carbonizing and incinerating the floating slag and activated sludge;
2) flocculation, chelation and sedimentation: adding a coagulant, a metal chelating agent and a flocculant into an aqueous solution according to a certain proportion, condensing organic matters, suspended matters SS and heavy metal ions in sewage into a charged colloidal state, adding the flocculant to perform complexing, settling and separating the colloidal state, concentrating sediment generated by the sewage and the flocculant, and performing carbonization and incineration treatment on the sediment and activated sludge;
3) hydrolysis and acidification: hydrolyzing and acidifying organic matters in water through the cultured hydrolytic acidification zymophyte to generate micromolecule acids and serve as a carbon source for nitrate denitrification;
4) AO biochemistry: sequentially injecting sewage into a pool A and a pool O for AO biochemical treatment, wherein the sewage is injected into the pool A and stays for 8 hours, the pool A is in an anoxic environment, the pool A denitrifies nitrate in water into nitrogen, the denitrification is enhanced by adopting a biofilm formation method, and the pool O degrades COD into CO2；
5) Fenton reaction: and (3) injecting the treated purified water into a secondary sedimentation tank for sedimentation and standing, generating a large amount of hydroxyl free radicals after the sewage undergoes Fenton reaction, oxidizing and breaking chains of organic matters which are difficult to be biochemically in the water, and generating degradable organic matters.
As a preferred embodiment of the present invention, in step 2), the coagulant includes one or more of polyaluminium chloride, polyaluminium sulfate, polyferric sulfate and polyferric chloride, the chelating agent includes one or more of EDTA-2Na, sodium α -glucoheptonate and EDTA-4Na, and the flocculant is polyacrylamide.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (6)
1. A chemical cleaning and sewage treatment process of a reverse osmosis membrane is characterized by comprising the following steps:
1) performing element analysis on the fouling: collecting dirt blocking objects on the surface of the membrane element, analyzing the components of the dirt blocking objects and judging the type of the dirt;
2) determining the type and proportion of the fouling: collecting and analyzing the dirt in the on-site dirt blocking membrane, judging the general components and accurate content of the dirt through analysis, and further selecting and making a corresponding cleaning scheme;
3) and (3) carrying out single membrane cleaning test by a small test machine: preparing a cleaning solution according to the determined cleaning scheme, then cleaning in a single-membrane test machine, finely adjusting the cleaning solution in the cleaning process and optimizing the cleaning scheme;
4) large-scale cleaning: soaking a membrane element with high heavy metal and calcium sulfate content in dirt by using a cleaning agent, wherein the agent contains a component which is easily complexed with calcium ions, and after the membrane element is fully soaked, a calcium sulfate crystal body is disintegrated and taken out to be installed in a membrane cleaning device;
5) the first-stage acid washing process comprises the following steps: opening a valve of a pickling barrel, pickling, after the reaction is finished, opening an ultrasonic generator, adjusting the water inlet pressure of a cleaning water pump to 1Mpa, circularly cleaning, and stopping pickling when the pressure difference between the front and the back of the membrane is less than or equal to 0.05 Mpa;
6) the second stage alkali washing process comprises the following steps: opening a valve of an alkaline washing water barrel, adjusting the pH of alkaline water to 10-11 by using sodium hydroxide, adding a small amount of surfactant and chelating agent according to the dirt condition, opening an ultrasonic generator, and taking out a membrane element after cleaning;
7) and (3) detection and cleaning at the third stage: opening a valve of a brine barrel for detecting, adjusting the conductivity of brine to 1000 mu S/m by using sodium chloride, opening a water inlet pump, adjusting the pressure of brine in front of a membrane to 1MPa, reading the conductivity behind the membrane by using an online conductivity measuring instrument behind the membrane, calculating and removing the desalination rate according to a formula (desalination rate = 1-pure water conductivity behind the membrane/brine conductivity in front of the membrane), and converting and calculating the yield and the yield of pure water according to a pure water flowmeter behind the membrane and a concentrated water flowmeter;
8) and fourth-stage tap water sodium bisulfite cleaning: after the detection and cleaning are finished, simple running water circulation is carried out on the membrane element;
9) air flotation: introducing sewage into an air flotation device, carrying macromolecular organic matters to the surface of the air flotation device through bubbles generated by the air flotation device, and carrying out carbonization and incineration treatment on scum at the bottom of the air flotation device and activated sludge after the scum is concentrated;
10) flocculation, chelation and sedimentation: adding a coagulant, a metal chelating agent and a flocculant into an aqueous solution according to a certain proportion, condensing organic matters, suspended matters SS and heavy metal ions in sewage into a charged colloidal state, adding the flocculant to perform complexing, settling and separating the colloidal state, concentrating the sewage and sediments generated by the flocculant, and performing carbonization and incineration treatment on the sewage and activated sludge;
11) hydrolysis and acidification: hydrolyzing and acidifying organic matters in water through the cultured hydrolytic acidification zymophyte to generate micromolecule acids and serve as a carbon source for nitrate denitrification;
12) AO biochemistry: sewage is injected into a tank A and a tank O in sequence for AO biochemical treatment, nitrate radical in the sewage is denitrified into nitrogen in the tank A, the denitrification is enhanced by adopting a film-forming method, COD is degraded into CO in the tank O2；
13) Fenton reaction: and (3) injecting the treated purified water into a secondary sedimentation tank for sedimentation and standing, generating a large amount of hydroxyl free radicals after the sewage undergoes Fenton reaction, oxidizing and breaking chains of organic matters which are difficult to be biochemically in the water, and generating degradable organic matters.
2. The process for chemical cleaning of reverse osmosis membranes and wastewater treatment according to claim 1, wherein in step 5), the formulation of the acid wash reagent is: 0.5% of oxalic acid, 0.5% of citric acid and 0.05% of hydrochloric acid.
3. The process for chemical cleaning of reverse osmosis membranes and wastewater treatment according to claim 1, wherein in step 6), the alkaline detergent formulation is: 0.05% of sodium hydroxide, 0.05% of potassium hydroxide, 0.05% of sodium dodecyl benzene sulfonate and 0.05% of sodium dodecyl sulfate.
4. A process for chemical cleaning of a reverse osmosis membrane and treating wastewater according to claim 1, wherein in step 10), the coagulant comprises one or more of polyaluminium chloride, polyaluminium sulphate, polyferric sulphate and polyferric chloride.
5. The process for chemically cleaning a reverse osmosis membrane and treating sewage according to claim 1, wherein in the step 10), the metal chelating agent comprises one or more of EDTA-2Na, sodium alpha-glucoheptonate and EDTA-4Na, and the flocculating agent comprises polyacrylamide.
6. The process for chemical cleaning of a reverse osmosis membrane and treating wastewater according to claim 1, wherein in step 12), the wastewater is injected into the tank A and stays for 8 hours, and the tank A is in an anoxic environment.
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