CN112551786A - Method for removing epichlorohydrin from saponified wastewater by oxidation - Google Patents

Method for removing epichlorohydrin from saponified wastewater by oxidation Download PDF

Info

Publication number
CN112551786A
CN112551786A CN202011214974.1A CN202011214974A CN112551786A CN 112551786 A CN112551786 A CN 112551786A CN 202011214974 A CN202011214974 A CN 202011214974A CN 112551786 A CN112551786 A CN 112551786A
Authority
CN
China
Prior art keywords
treatment
water sample
filtering
oxidation
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011214974.1A
Other languages
Chinese (zh)
Inventor
张磊
张志强
冯为林
申高忠
黄留堂
陈正娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Ruixiang Chemical Co Ltd
Original Assignee
Jiangsu Ruixiang Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Ruixiang Chemical Co Ltd filed Critical Jiangsu Ruixiang Chemical Co Ltd
Priority to CN202011214974.1A priority Critical patent/CN112551786A/en
Publication of CN112551786A publication Critical patent/CN112551786A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46176—Galvanic cells
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/36—Organic compounds containing halogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/12—Prevention of foaming
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The invention provides a method for removing epichlorohydrin in saponified wastewater by oxidation, which comprises the following steps: s1, filtering the water sample, removing calcium hydroxide and magnesium hydroxide, adding hydrochloric acid to adjust the pH value to 7, and filtering to obtain suspended matters; s2, adjusting the temperature and the pH value of the water sample in S1 to be 40-80 ℃ and 2.0-4.0, and adding an oxidant into the pretreated water sample; s3, placing the water sample obtained in the step S2 in a conical flask, adding a defoaming agent, vibrating in a constant-temperature water bath vibrator for 45-60 min, cooling, standing for 60min, filtering and concentrating; the filtering treatment is any one of an activated carbon adsorption method, a micro-electrolysis method, a Fenton reagent treatment method and a hydrogen peroxide treatment method; the defoaming agent in S3 is one or two of hydrogen peroxide or potassium dichromate. The method is simple and convenient to operate, reduces large-scale equipment required during treatment, reduces the treatment cost, and simultaneously determines the treatment temperature and the treatment PH value through a single-factor experiment, thereby greatly improving the excellence during treatment.

Description

Method for removing epichlorohydrin from saponified wastewater by oxidation
Technical Field
The invention relates to the technical field of sewage treatment methods and processes, in particular to a method for removing epichlorohydrin from saponified wastewater by oxidation.
Background
Epichlorohydrin is also known as 3-chloro-1, 2-epoxypropane, commonly known as epichlorohydrin, abbreviated as EPI or ECH, and has a chemical formula of C3H5CIO, is a colorless liquid, an organic compound with a chloroform-like smell, and has a boiling point of 116.11 ℃, and is an important organic synthetic raw material and an intermediate. Can be used for producing epoxy resin and can be used as a diluent of the epoxy resin. Also useful for the manufacture of glycerin, nitroglycerin explosives, glass reinforced plastics, glycerol methacrylate, epichlorohydrin rubbers, glycidyl derivatives, surfactants, electrical insulation articles, and the like. Is also a common raw material for manufacturing products such as various adhesives, medicines, pesticides, plasticizers, ion exchange resins and the like.
In the prior method for removing epichlorohydrin in saponified wastewater on the market, the salinity of treatment liquid applicable to biological treatment is low, while the salinity of saponification treatment liquid is too high, so that microbial acclimation is difficult. Usually, the dilution is carried out first, and then the biological treatment is carried out. But contains high-concentration Ca2+, and can generate a large amount of CaCO3 precipitate through the action of aeration and CO2 in the air. These precipitates adhere to the surface of the activated sludge, reducing the activity of the sludge and greatly reducing the effect of biochemical treatment. Meanwhile, the higher salt content can inhibit the growth of microorganisms, so that the treatment difficulty is higher and the cost is higher; organic components in epoxy saponification are complex, organic wastes cannot be fundamentally treated by adopting activated carbon or molecular sieve for adsorption, the discharge amount is large, the catalytic cost is high when the organic wastes are treated by adopting a high-temperature high-pressure catalytic oxidation treatment technology, and the treatment process is complex, so that a method for removing epoxy chloropropane by oxidation is urgently needed in the market to solve the problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for removing epichlorohydrin in saponification wastewater by oxidation, so as to solve the problem that the three treatment methods in the market at present, which are provided in the background art, are insufficient.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for removing epichlorohydrin from saponified wastewater by oxidation comprises the following steps:
s1, filtering the water sample, removing calcium hydroxide and magnesium hydroxide, adding hydrochloric acid to adjust the pH value to 7, and filtering to obtain suspended matters;
s2, adjusting the temperature and the pH value of the water sample in S1 to be 40-80 ℃ and 2.0-4.0, and adding an oxidant into the pretreated water sample;
s3, placing the water sample obtained in the step S2 in a conical flask, adding a defoaming agent, vibrating in a constant-temperature water bath vibrator for 45-60 min, cooling, standing for 60min, filtering and concentrating;
the filtering treatment is any one of an activated carbon adsorption method, a micro-electrolysis method, a Fenton reagent treatment method and a hydrogen peroxide treatment method; the defoaming agent in S3 is one or two of hydrogen peroxide and potassium dichromate.
Further, the mass ratio of the oxidant to the water sample in the S2 is 1-1.5: 180.
further, the mass ratio of the hydrogen peroxide to the potassium dichromate is 1: 1.5.
further, when the oscillation time in the S3 is 35-40 min, adding a defoaming agent, wherein the defoaming agent is an organic silicon type emulsion defoaming agent, and the mass ratio of the defoaming agent to the water sample is 0.8-1: 200.
further, the rotation speed of the constant-temperature water bath oscillator in the S3 is 100-120 r/min.
Furthermore, the aperture of the filter screen in the S3 is 80-120 μm.
Compared with the prior art, the invention has the beneficial effects that:
1) the method is simple and convenient to operate, reduces large equipment required during treatment, reduces the treatment cost, and simultaneously determines the treatment temperature and the treatment PH value through single-factor experiments, thereby greatly improving the excellence during treatment, reducing the influence of inaccurate factor value on the treatment effect, reducing the occupational requirements of workers through simple operation steps, reducing the demands of the workers, reducing the labor cost of the workers, meeting the treatment standard of the saponification treatment liquid, and solving the problem that the three treatment methods in the market at present are insufficient.
2) According to the invention, impurities in water are greatly reduced by filtering a water sample, the value of COD concentration can be effectively reduced, meanwhile, the Fenton reagent is the method with the lowest cost in the filtering method, the production cost can be reduced, and the stability of the solution can be improved by adding the defoaming agent.
3) The invention converts insoluble alkali metal suspended matters into soluble salts through hydrochloric acid, can effectively remove the soluble salts, and solves the problems that the saponification treatment liquid has too high salinity, the microorganism domestication is difficult, and simultaneously the higher salinity can generate an inhibiting effect on the growth of microorganisms, the treatment difficulty is higher, and the cost is higher.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description is merely illustrative of the technical solutions of the present invention, and should not be construed as being all of the present invention or limiting or restricting the technical solutions of the present invention.
The technical solution of the present invention will be further described in detail with reference to the following examples.
A method for removing epichlorohydrin in saponified wastewater by oxidation comprises the following steps:
s1: filtering a water sample, pretreating to remove calcium hydroxide and magnesium hydroxide, adding a proper amount of hydrochloric acid to adjust the pH value to 7, converting insoluble alkali metal suspended matters into soluble salts, filtering and taking out;
the active carbon is a fine carbon grain with a large surface area and fine pores, namely capillaries. Such a capillary tube has a strong adsorption ability, and can sufficiently contact a gas (impurity) because the surface area of the carbon particle is large. When the gas (impurities) is adsorbed by the capillary, the purification effect is achieved.
The micro-electrolysis treatment refers to a method for purifying wastewater by utilizing an original electric reaction. Based on the electrochemical principle, two conductors with different electronegativities are directly connected together and immersed in a conductive electrolyte to form a primary battery. The electric field effect around the conductor is utilized to make the charged ions in the solution move to the electrode with opposite charges for reaction, and simultaneously, the product generated by the electric reaction and the chemical substances in the solution are chemically changed, thereby achieving the purpose of removing the chemical pollutants.
H2O2In Fe2+Has the capability of oxidizing various organic matters under the catalytic action of ions, wherein Fe2+The ion acts primarily as a homogeneous catalyst, and H2O2Oxidation is effected. Hydrogen peroxide and catalyst Fe2+The resulting oxidation system is commonly referred to as a Fenton reagent. Under the action of the catalyst, the hydrogen peroxide can generate two active hydroxyl radicals, so that the radical chain reaction is initiated and propagated, and the oxidation of organic matters and reducing substances is accelerated. The Fenton reagent is generally run at pH 3.5, where the hydroxyl radical formation rate is greatest.
The water sample filtering method is one of an activated carbon adsorption method, a micro-electrolysis method, a Fenton reagent treatment method and a hydrogen peroxide treatment method, wherein the Fenton reagent treatment method is the optimal Fenton reagent treatment method.
Performing single factor experiment
Three 180ml water samples with the temperature of 40 ℃, 60 ℃ and 80 ℃ are respectively taken out from 180g of water sample, the PH value is adjusted to 3.0, and the influence of the temperature is examined.
Adding 1.2g of hydrogen peroxide, placing the mixture in a conical flask, shaking the mixture in a constant-temperature water bath shaker for 45min, cooling the mixture, adjusting the pH value to 7, standing the mixture for 60min, filtering and purifying the mixture by using qualitative medium-speed filter paper, and determining the COD concentration.
And measuring and comparing to obtain that the temperature of 60 ℃ in the second step is the proper treatment temperature.
Then 180ml of water samples with the pH values of 2.0, 3.0 and 4.0 are taken, the temperature of the water samples is set to be 60 ℃, and the influence of the pH values is investigated.
Adding 1.2g of hydrogen peroxide, placing the mixture in a conical flask, shaking the mixture in a constant-temperature water bath shaker for 45min, cooling the mixture, adjusting the pH value to 7, standing the mixture for 60min, filtering and purifying the mixture by using qualitative medium-speed filter paper, and determining the COD concentration.
And (4) determining that the pH value in the second step is the proper pH value for treatment when the pH value is 3.0 by measurement and comparison.
S2: adjusting the temperature of a water sample to be 60 ℃ and the pH value to be 3 to obtain a pretreated water sample, adding an oxidant into the pretreated water sample, wherein the oxidant is one or a combination of two of hydrogen peroxide and potassium dichromate, and the mass ratio of the oxidant to the water sample is 1: 180 of the total weight of the composition; when the oxidizing agent adopts the combination of hydrogen peroxide and potassium dichromate, the mass ratio of the hydrogen peroxide to the potassium dichromate is 1: 1.5.
s3: placing a water sample in a conical flask and oscillating for 45min in a constant-temperature water bath oscillator, wherein the rotating speed of the constant-temperature water bath oscillator is 100r/min, and when the oscillation time reaches 35min, adding a defoaming agent, wherein the defoaming agent is an organic silicon type emulsion defoaming agent, and the mass ratio of the defoaming agent to the water sample is 0.8: 200. after the oscillation is finished, the mixture is cooled and then stands for 60min, and is filtered and concentrated by a 80-micron filter screen.
The rotation speed of the constant temperature water bath oscillator is 100-120 r/min, and the aperture of the filter screen in S3 is 80-120 μm. Because the rotating speed of the constant-temperature water bath oscillator and the diameter of the filter screen in S3 have no substantial influence on the removal effect of the method for removing the epichlorohydrin by oxidation in the saponified wastewater, the rotating speed of the constant-temperature water bath oscillator can be any rotating speed of 100-120 r/min, and the diameter of the filter screen in S3 can be any size of 80-120 mu m.
The method is simple and convenient to operate, reduces large equipment required during treatment, reduces the treatment cost, and simultaneously determines the treatment temperature and the treatment PH value through single-factor experiments, thereby greatly improving the excellence during treatment, reducing the influence of inaccurate factor value on the treatment effect, reducing the occupational requirements of workers through simple operation steps, reducing the demands of the workers, reducing the labor cost of the workers, meeting the treatment standard of the saponification treatment liquid, and solving the problem that the three treatment methods in the market at present are insufficient.
Insoluble alkali metal suspended matters are converted into soluble salts through hydrochloric acid, so that the soluble salts can be effectively removed, and the problems that the saponification treatment liquid is too high in salinity, the microbial domestication is difficult, the higher salt content can inhibit the growth of microorganisms, the treatment difficulty is higher, and the cost is higher are solved. The impurities in the water are greatly reduced by filtering the water sample, the value of the COD concentration can be effectively reduced, meanwhile, the Fenton reagent is the method with the lowest cost in the filtering method, the production cost can be reduced, and the stability of the solution can be improved by adding the defoaming agent.
It will be evident to those skilled in the art that the 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. The present embodiments are therefore 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.

Claims (6)

1. A method for removing epichlorohydrin from saponified wastewater by oxidation is characterized by comprising the following steps:
s1, filtering the water sample, removing calcium hydroxide and magnesium hydroxide, adding hydrochloric acid to adjust the pH value to 7, and filtering to obtain suspended matters;
s2, adjusting the temperature and the pH value of the water sample in S1 to be 40-80 ℃ and 2.0-4.0, and adding an oxidant into the pretreated water sample;
s3, placing the water sample obtained in the step S2 in a conical flask, adding a defoaming agent, vibrating in a constant-temperature water bath vibrator for 45-60 min, cooling, standing for 60min, filtering and concentrating;
the filtering treatment is any one of an activated carbon adsorption method, a micro-electrolysis method, a Fenton reagent treatment method and a hydrogen peroxide treatment method; the defoaming agent in S3 is one or two of hydrogen peroxide or potassium dichromate.
2. The method for removing epichlorohydrin from saponified wastewater by oxidation according to claim 1, wherein the mass ratio of the oxidant to the water sample in S2 is 1-1.5: 180.
3. the method for removing epichlorohydrin from saponified wastewater by oxidation according to claim 1, wherein the mass ratio of hydrogen peroxide to potassium dichromate is 1: 1.5.
4. the method for removing epichlorohydrin from saponified wastewater by oxidation according to claim 1, wherein an antifoaming agent is added when the oscillation time in S3 is 35-40 min, the antifoaming agent is an organosilicon type emulsion antifoaming agent, and the mass ratio of the antifoaming agent to the water sample is 0.8-1: 200.
5. the method for removing epichlorohydrin from saponified wastewater by oxidation as recited in claim 1, wherein the rotation speed of the constant-temperature water bath oscillator in S3 is 100-120 r/min.
6. The method for removing epichlorohydrin from saponified wastewater by oxidation as recited in claim 1, wherein said S3 medium screen has a pore size of 80 to 120 μm.
CN202011214974.1A 2020-11-04 2020-11-04 Method for removing epichlorohydrin from saponified wastewater by oxidation Pending CN112551786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011214974.1A CN112551786A (en) 2020-11-04 2020-11-04 Method for removing epichlorohydrin from saponified wastewater by oxidation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011214974.1A CN112551786A (en) 2020-11-04 2020-11-04 Method for removing epichlorohydrin from saponified wastewater by oxidation

Publications (1)

Publication Number Publication Date
CN112551786A true CN112551786A (en) 2021-03-26

Family

ID=75041398

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011214974.1A Pending CN112551786A (en) 2020-11-04 2020-11-04 Method for removing epichlorohydrin from saponified wastewater by oxidation

Country Status (1)

Country Link
CN (1) CN112551786A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295030A (en) * 1999-11-06 2001-05-16 巴陵石化鹰山石油化工厂 Method of solving the problem of alkali-carrying gas phase obtained by evaporating waste saponified alkali liquid
CN104609629A (en) * 2014-12-30 2015-05-13 中国天辰工程有限公司 Method for treating glycerin-based epoxy chloropropane saponification wastewater
CN107698087A (en) * 2017-11-23 2018-02-16 山东民基化工有限公司 Epoxychloropropane saponification waste-water decolouring removal of impurities processing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295030A (en) * 1999-11-06 2001-05-16 巴陵石化鹰山石油化工厂 Method of solving the problem of alkali-carrying gas phase obtained by evaporating waste saponified alkali liquid
CN104609629A (en) * 2014-12-30 2015-05-13 中国天辰工程有限公司 Method for treating glycerin-based epoxy chloropropane saponification wastewater
CN107698087A (en) * 2017-11-23 2018-02-16 山东民基化工有限公司 Epoxychloropropane saponification waste-water decolouring removal of impurities processing method

Similar Documents

Publication Publication Date Title
Zhang et al. Capacitive membrane stripping for ammonia recovery (CapAmm) from dilute wastewaters
CN1192817C (en) Apparatus for producing water containing dissolved ozone
CN105130087A (en) Nano quantum dot adsorption and film separating system for removing heavy metal in water
US20210198123A1 (en) Flexible electrocatalytic membrane for removing nitrate from water, preparation method and use thereof
CN104743717A (en) Method and system for reduction of concentrated brine
CN107349787A (en) A kind of application of the forward osmosis membrane preparation method for adding amination graphene quantum dot, prepared forward osmosis membrane and the film
US11795086B2 (en) Combined waste water and gas treatment system for efficiently decarbonizing and removing nitrogen
CN102153240A (en) Method for treating waste water from production of metronidazole
CN103936208A (en) Efficient micro-electrolysis multiphase flow air flotation reactor
CN108295812A (en) A kind of graphene oxide composite membrane for selective removal underwater gold category ion and preparation method thereof, application
CN104556473A (en) Deep phosphorus removal method for organophosphorus wastewater
CN111995020B (en) Preparation method of polymeric magnesium aluminum cerium chloride coagulant
CN112551786A (en) Method for removing epichlorohydrin from saponified wastewater by oxidation
CN107098513B (en) Method for treating high-concentration morpholine wastewater
CN111115661B (en) Nitric acid wastewater treatment system and method
CN112110524A (en) Two-membrane three-phase integrated device and method for ammonia nitrogen wastewater treatment
CN111440354A (en) Preparation method and application of bisphenol A molecularly imprinted composite membrane with through hierarchical pore structure
CN103846010B (en) A kind of preparation method of self assembly high salt high ammonia-nitrogen wastewater nanofiltration separation membrane
CN102976567B (en) A kind of technique of the multistage photocatalysis treatment paint waste water of ultraviolet visible light
CN110615501A (en) Method for treating landfill leachate
CN106045124B (en) A method of residual organic matter in removal bio-reaction system water outlet
CN109626757A (en) A kind of method of light electrolysis-MBR coupling technique treatment of laboratory waste water
CN112897771B (en) Treatment device and treatment method for rare earth smelting wastewater
Liu et al. Electrocatalytic reduction of nitrate using Pd-Cu modified carbon nanotube membranes
CN203754535U (en) Efficient micro-electrolysis multiphase flow air flotation reactor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210326

RJ01 Rejection of invention patent application after publication