CN108970412A - A kind of cleaning method of ceramic membrane - Google Patents
A kind of cleaning method of ceramic membrane Download PDFInfo
- Publication number
- CN108970412A CN108970412A CN201811165720.8A CN201811165720A CN108970412A CN 108970412 A CN108970412 A CN 108970412A CN 201811165720 A CN201811165720 A CN 201811165720A CN 108970412 A CN108970412 A CN 108970412A
- Authority
- CN
- China
- Prior art keywords
- cleaning
- ceramic membrane
- flow rate
- cleaning method
- predetermined time
- 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
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/06—Flat membranes
-
- 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
- B01D2321/04—Backflushing
-
- 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
Abstract
The present invention provides a kind of cleaning method of ceramic membrane, cleaning step includes: (1) physical cleaning: ultrapure water hydro-peening, with predetermined flow rate and predetermined time ultrapure water backwashing；(2) chemical cleaning: with predetermined flow rate and predetermined time with compound drug wash cycles and static immersing.The temperature of chemical cleaning is room temperature.The present invention can save energy consumption without heating；Chemical cleaning directlys adopt the compound drug cleaning prepared in advance, cleans without multi-step, enormously simplifies traditional cleaning step and scavenging period, and cleaning effect is good, cleaning efficiency height is suitable for commercial introduction and application.
Description
Technical field
The present invention relates to Membrane cleaning method and technology field more particularly to a kind of cleaning methods of ceramic membrane.
Background technique
In recent years, with the continuous quickening of urbanization process, water environment pollution is more serious, and shortage of water resources problem is prominent
Out.Recycling reuse is effectively treated and realized to waste water, is the important way for preventing and treating water pollution, alleviating shortage of water resources
Diameter.Membrane technology with its efficient, easy to operate, facility compact of separation, without phase-change with the advantages that energy conservation wastewater treatment with return
It is used widely with field.Inorganic ceramic membrane has that its corrosion-resistant, high temperature resistant, stable structure, mechanical strength be big, service life
The advantages that long, thus become the hot spot of membrane technology developmental research.However fouling membrane is to restrict membrane technology development and answer always
Problem.
The method of control fouling membrane has and improves membrane material characteristic, pretreatment, optimization filter condition, Membrane cleaning etc. before film.Film
Cleaning is the method for control membrane pollution problem the most efficient.Membrane cleaning includes physical cleaning and chemical cleaning.Physics is clear
Washing is the pollution (mainly concentration polarization pollution) that film surface is removed using the power of instrument, simple and easy.Mainly have hydrodynamic cleaning,
Aqueous vapor backwash, sponge balls washing and ultrasonic cleaning more advanced at present etc..
However, physical cleaning has little effect, there is no effect to the irreversible membrane fouling of film.Therefore, research film is clear both at home and abroad
In terms of that washes focuses on chemical cleaning.Chemical cleaning medicament have oxidant, chelating agent, acid, alkali and it is surfactant-based and
Some business cleaning agents emerged in large numbers on the market etc..
But these cleaning agents are lack of pertinence, and are usually required a variety of cleaning agent point multisteps and be cleaned multiple times, cleaning step
It is complicated；Some cleaning agents also need heating condition, and energy consumption is high, are not easy to promote the use of.Therefore, it is badly in need of a kind of with strong points, cleaning
Step is simple, low energy consumption high-efficient cleaning method.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of flat ceramic Membrane cleaning, and cleaning effect is good, high-efficient, are easy to
Operation, to solve the above problem.
To achieve the above object, a kind of flat ceramic Membrane cleaning provided by the invention method the following steps are included:
(1) ultrapure water hydro-peening；
(2) ultrapure water is backwashed with the first predetermined flow rate and the first predetermined time；
(3) compounding cleaning solution (neopelex+nonylphenol polyoxyethylene ether, ethylenediamine are added with the second predetermined flow rate
Tetraacethyl disodium+neopelex, disodium ethylene diamine tetraacetate+nonylphenol polyoxyethylene ether, sodium hypochlorite+dodecane
Base benzene sulfonic acid sodium salt, sodium hypochlorite+nonylphenol polyoxyethylene ether) in any one, and control pH 12, temperature is for room temperature
Can, the second predetermined time of wash cycles.
(4) with chemical agent Liquid Residue in third predetermined flow rate and third predetermined time ultrapure water film.
Compared with prior art, ceramic membrane cleaning method of the invention using the cleaning of cleaning pump circulation compound drug and
Static immersing has fabulous removal effect to the pollutant on film.Cleaning step and time greatly simplify, and without heating, save
Energy consumption is easy to industrially promote and apply.
In one preferred embodiment, the first predetermined flow rate is 1.5 ~ 2L/min, the first predetermined time in step (2)
For 3 ~ 5min.
In another preferred embodiment, the mass concentration of sodium hypochlorite is equal in compound drug combination in step (3)
It is 5 ‰.
In another preferred embodiment, in step (3) in compound drug combination, anionic surfactant 12
The concentration of sodium alkyl benzene sulfonate and nonionic surfactant nonylphenol polyoxyethylene ether is 4 times of respective micellar concentration, but
The molar ratio of neopelex and nonylphenol polyoxyethylene ether is 1:3 in combination.
In another preferred embodiment, in step (3) compound drug combination in, disodium ethylene diamine tetraacetate it is dense
Degree is 10mmol/L.
In another preferred embodiment, in step (3) in compound drug combination, the second predetermined flow rate is 0.5 ~ 1
L/min, the second predetermined time are 30 ~ 40min.
In another preferred embodiment, cleaning pump wash cycles finish in step (3), also need static immersing 30 ~
60min。
In another preferred embodiment, third predetermined flow rate is 1 ~ 1.5 L/min in step (4), and third is predetermined
Time is 15min.
In another preferred embodiment, both may be used in step (3) using cleaning pump pressurization compound drug wash cycles
To meet cleaning system head loss, also there is hydrodynamic cleaning effect；Alternately made using medical fluid circulation, static immersing or both
Cleaning way.
Specific embodiment: being described further below with reference to cleaning method of the example to ceramic membrane of the invention,
But it is not so limited the present invention.
Cleaning method of the invention carries out in film filtering reactor, and the cleaning equipment utilized includes cleaning pump and Membrane cleaning
Reactor.
The present invention provides a kind of methods of flat ceramic Membrane cleaning, method includes the following steps:
(1) ultrapure water hydro-peening；
(2) ultrapure water is backwashed with the first predetermined flow rate and the first predetermined time；
(3) compounding cleaning solution (neopelex+nonylphenol polyoxyethylene ether, ethylenediamine are added with the second predetermined flow rate
Tetraacethyl disodium+neopelex, disodium ethylene diamine tetraacetate+nonylphenol polyoxyethylene ether, sodium hypochlorite+dodecane
Base benzene sulfonic acid sodium salt, sodium hypochlorite+nonylphenol polyoxyethylene ether) in any one, and control pH 12, temperature is for room temperature
Can, the second predetermined time of wash cycles.
(4) with chemical agent Liquid Residue in third predetermined flow rate and third predetermined time ultrapure water film.
Compared with prior art, ceramic membrane cleaning method of the invention using the cleaning of cleaning pump circulation compound drug and
Static immersing has fabulous removal effect to the pollutant on film.Cleaning step and time greatly simplify, and without heating, save
Energy consumption is easy to industrially promote and apply.
In one preferred embodiment, the first predetermined flow rate is 1.5 ~ 2L/min, the first predetermined time in step (2)
For 3 ~ 5min.
In another preferred embodiment, the mass concentration of sodium hypochlorite is equal in compound drug combination in step (3)
It is 5 ‰.
In another preferred embodiment, in step (3) in compound drug combination, anionic surfactant 12
The concentration of sodium alkyl benzene sulfonate and nonionic surfactant nonylphenol polyoxyethylene ether is 4 times of respective micellar concentration, but
The molar ratio of neopelex and nonylphenol polyoxyethylene ether is 1:3 in combination.
In another preferred embodiment, in step (3) compound drug combination in, disodium ethylene diamine tetraacetate it is dense
Degree is 10mmol/L.
In another preferred embodiment, in step (3) in compound drug combination, the second predetermined flow rate is 0.5 ~ 1
L/min, the second predetermined time are 30 ~ 40min.
In another preferred embodiment, cleaning pump wash cycles finish in step (3), also need static immersing 30 ~
60min。
In another preferred embodiment, third predetermined flow rate is 1 ~ 1.5 L/min in step (4), and third is predetermined
Time is 15min.
In another preferred embodiment, both may be used in step (3) using cleaning pump pressurization compound drug wash cycles
To meet cleaning system head loss, also there is hydrodynamic cleaning effect；Alternately made using medical fluid circulation, static immersing or both
Cleaning way.
Main advantages of the present invention are:
The present invention provides a kind of cleaning method of ceramic membrane, this method can save energy consumption without heating；Chemical cleaning
The compound drug cleaning prepared in advance is directlyed adopt, is cleaned without multi-step, enormously simplifies traditional cleaning step and cleaning
Time, and cleaning effect is good, cleaning efficiency height is suitable for commercial introduction and application.
Below with reference to specific example, the present invention is further elaborated.But these examples are merely to illustrate the present invention
And it is not meant to limit the scope of the invention.
Example 1:
Process conditions: polluted membrane: the polluted membrane in flat ceramic film process municipal administration secondary effluent；
Cleaning way: medical fluid circulation+static immersing:
Cleaning temperature: room temperature:
Scavenging period: each step is different；
Cleaning solution is prepared: being all made of ultrapure water is solvent；
Sodium hypochlorite and disodium ethylene diamine tetraacetate compound cleaning solution: sodium hypochlorite mass concentration is 5 ‰, ethylenediamine tetra-acetic acid two
Na concn is 10mmol/L, and the pH to 12 of combination solution is adjusted with sodium hydroxide；With 1L/min flow velocity wash cycles 40min；
Cleaning step:
(1) ultrapure water hydro-peening；
(2) ultrapure water backwashes 5min with 2L/min flow velocity；
(3) the compounding cleaning solution of sodium hypochlorite and disodium ethylene diamine tetraacetate is added with 1L/min flow velocity, and with sodium hydroxide tune
Save the pH to 12 of combination solution；With 1L/min flow velocity wash cycles 40min, temperature is room temperature.
(4) with chemical agent Liquid Residue in 1.5L/min flow velocity ultrapure water film, washing time 15min.
Experimental result: clear water flux restores 102.8% to this experiment operation.
Example 2:
Process conditions: polluted membrane: the polluted membrane in flat ceramic film process municipal administration secondary effluent；
Cleaning way: medical fluid circulation+static immersing:
Cleaning temperature: room temperature:
Scavenging period: each step is different；
Cleaning solution is prepared: being all made of ultrapure water is solvent；
The compounding cleaning solution of disodium ethylene diamine tetraacetate and nonylphenol polyoxyethylene ether: disodium ethylene diamine tetraacetate concentration is
10mmol/L, the concentration of nonylphenol polyoxyethylene ether are 4 times of micellar concentrations, and the pH to 12 of combination solution is adjusted with sodium hydroxide；
With 1L/min flow velocity wash cycles 40min；
Cleaning step:
(1) ultrapure water hydro-peening；
(2) ultrapure water backwashes 5min with 2L/min flow velocity；
(3) the compounding cleaning solution of disodium ethylene diamine tetraacetate and nonylphenol polyoxyethylene ether is added with 1L/min flow velocity, uses hydrogen-oxygen
Change the pH to 12 that sodium adjusts combination solution；With 1L/min flow velocity wash cycles 40min, temperature is room temperature.
(4) with chemical agent Liquid Residue in 1.5L/min flow velocity ultrapure water film, washing time 15min.
Experimental result: clear water flux restores 102.79% to this experiment operation.
Embodiment 3:
Process conditions:
Polluted membrane: the polluted membrane in flat ceramic film process petrochemical wastewater；
Cleaning way: medical fluid circulation+static immersing:
Cleaning temperature: room temperature:
Scavenging period: each step is different；
Cleaning solution is prepared: being all made of ultrapure water is solvent；
The compounding cleaning solution of neopelex and nonylphenol polyoxyethylene ether: the molar ratio of the two is detergent alkylate sulphur
Sour sodium: nonylphenol polyoxyethylene ether=1:3 adjusts the pH to 12 of combination solution with sodium hydroxide；With 1L/min flow velocity circulation cleaning
Wash 40min；
Cleaning step:
(1) ultrapure water hydro-peening；
(2) ultrapure water backwashes 5min with 2L/min flow velocity；
(3) the compounding cleaning solution of neopelex and nonylphenol polyoxyethylene ether is added with 1L/min flow velocity, uses hydrogen-oxygen
Change the pH to 12 that sodium adjusts combination solution；With 1L/min flow velocity wash cycles 40min, temperature is room temperature.
(4) with chemical agent Liquid Residue in 1.5L/min flow velocity ultrapure water film, washing time 15min.
Experimental result: clear water flux restores 114.71% to this experiment operation.
Above-mentioned embodiment is only presently preferred embodiments of the present invention, practical range not for the purpose of limiting the invention.It is i.e. all
Change and modify on an equal basis made by the content of claim according to the present invention, all should be technology scope of the invention.
Claims (9)
1. a kind of cleaning method of ceramic membrane, method includes the following steps:
(1) ultrapure water hydro-peening；
(2) ultrapure water is backwashed with the first predetermined flow rate and the first predetermined time；
(3) compounding cleaning solution (neopelex+nonylphenol polyoxyethylene ether, ethylenediamine are added with the second predetermined flow rate
Tetraacethyl disodium+neopelex, disodium ethylene diamine tetraacetate+nonylphenol polyoxyethylene ether, sodium hypochlorite+dodecane
Base benzene sulfonic acid sodium salt, sodium hypochlorite+nonylphenol polyoxyethylene ether) in any one, and control pH 12, temperature is for room temperature
Can, the second predetermined time of wash cycles；
(4) with chemical agent Liquid Residue in third predetermined flow rate and third predetermined time ultrapure water film.
2. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: first in the step (2)
Predetermined flow rate is 1.5 ~ 2L/min, and the first predetermined time was 3 ~ 5min.
3. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: compounding in the step (3)
The mass concentration of sodium hypochlorite is 5 ‰ in pharmaceutical agent combinations.
4. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: compounding in the step (3)
In pharmaceutical agent combinations, anionic surfactant sodium dodecylbenzene sulfonate and nonionic surfactant nonylphenol polyoxyethylene ether
Concentration be 4 times of respective micellar concentration, but neopelex and Nonyl pheno in combination
The molar ratio of ether is 1:3.
5. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: compounding in the step (3)
In pharmaceutical agent combinations, the concentration of disodium ethylene diamine tetraacetate is 10mmol/L.
6. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: compounding in the step (3)
In pharmaceutical agent combinations, the second predetermined flow rate is 0.5 ~ 1 L/min, and the second predetermined time was 30 ~ 40min.
7. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: cleaning in the step (3)
Pump circulation cleaning finishes, and also needs 30 ~ 60min of static immersing.
8. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: third in the step (4)
Predetermined flow rate is 1 ~ 1.5 L/min, and the third predetermined time is 15min.
9. a kind of cleaning method of ceramic membrane as described in claim 1, it is characterised in that: utilize cleaning in step (3)
Pump pressurization compound drug wash cycles, both can satisfy cleaning system head loss, and had also had hydrodynamic cleaning effect；Using medical fluid
The cleaning way that circulation, static immersing or both are used alternatingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811165720.8A CN108970412A (en) | 2018-10-08 | 2018-10-08 | A kind of cleaning method of ceramic membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811165720.8A CN108970412A (en) | 2018-10-08 | 2018-10-08 | A kind of cleaning method of ceramic membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108970412A true CN108970412A (en) | 2018-12-11 |
Family
ID=64543290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811165720.8A Pending CN108970412A (en) | 2018-10-08 | 2018-10-08 | A kind of cleaning method of ceramic membrane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108970412A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109529631A (en) * | 2018-12-13 | 2019-03-29 | 合肥信达膜科技有限公司 | A kind of ceramic membrane cleaning method for ceramic filter |
| CN111330449A (en) * | 2020-04-01 | 2020-06-26 | 天津鼎芯膜科技有限公司 | Method for cleaning and regenerating reverse osmosis membrane pollution |
| CN112537823A (en) * | 2020-11-09 | 2021-03-23 | 济南大学 | Method for controlling aging of ultrafiltration membrane by micro-nano bubble technology enhanced chemical cleaning |
| CN114951158A (en) * | 2022-05-31 | 2022-08-30 | 佛山市海天(宿迁)调味食品有限公司 | Method for reducing coking and scaling of soy sauce sterilization equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101643253A (en) * | 2009-08-25 | 2010-02-10 | 山西太钢不锈钢股份有限公司 | Backwash method of ultrafiltration system in high hardness wastewater treatment |
| CN101829505A (en) * | 2009-03-09 | 2010-09-15 | 江西金达莱环保研发中心有限公司 | Chemical cleaning method of hollow fiber membrane and device thereof |
| CN103341326A (en) * | 2013-06-18 | 2013-10-09 | 吴章锋 | Cleaning agent of oxidized film and its preparation method and use |
| CN103752175A (en) * | 2014-01-22 | 2014-04-30 | 浙江卓锦工程技术有限公司 | Immersed type on-line cleaning method and device for slab ceramic membrane |
| CN103949163A (en) * | 2014-04-25 | 2014-07-30 | 山西太钢不锈钢股份有限公司 | Method for cleaning immersed ultrafiltration membrane in wastewater reuse |
| CN105983342A (en) * | 2015-01-29 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Method for cleaning ultrafiltration membrane |
| CN108570364A (en) * | 2017-08-24 | 2018-09-25 | 江苏赛瑞迈科新材料有限公司 | A kind of ceramic membrane dirt detergent and its preparation and application |
-
2018
- 2018-10-08 CN CN201811165720.8A patent/CN108970412A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829505A (en) * | 2009-03-09 | 2010-09-15 | 江西金达莱环保研发中心有限公司 | Chemical cleaning method of hollow fiber membrane and device thereof |
| CN101643253A (en) * | 2009-08-25 | 2010-02-10 | 山西太钢不锈钢股份有限公司 | Backwash method of ultrafiltration system in high hardness wastewater treatment |
| CN103341326A (en) * | 2013-06-18 | 2013-10-09 | 吴章锋 | Cleaning agent of oxidized film and its preparation method and use |
| CN103752175A (en) * | 2014-01-22 | 2014-04-30 | 浙江卓锦工程技术有限公司 | Immersed type on-line cleaning method and device for slab ceramic membrane |
| CN103949163A (en) * | 2014-04-25 | 2014-07-30 | 山西太钢不锈钢股份有限公司 | Method for cleaning immersed ultrafiltration membrane in wastewater reuse |
| CN105983342A (en) * | 2015-01-29 | 2016-10-05 | 东莞新科技术研究开发有限公司 | Method for cleaning ultrafiltration membrane |
| CN108570364A (en) * | 2017-08-24 | 2018-09-25 | 江苏赛瑞迈科新材料有限公司 | A kind of ceramic membrane dirt detergent and its preparation and application |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109529631A (en) * | 2018-12-13 | 2019-03-29 | 合肥信达膜科技有限公司 | A kind of ceramic membrane cleaning method for ceramic filter |
| CN109529631B (en) * | 2018-12-13 | 2021-07-23 | 合肥信达膜科技有限公司 | Ceramic membrane cleaning method for ceramic filter |
| CN111330449A (en) * | 2020-04-01 | 2020-06-26 | 天津鼎芯膜科技有限公司 | Method for cleaning and regenerating reverse osmosis membrane pollution |
| CN112537823A (en) * | 2020-11-09 | 2021-03-23 | 济南大学 | Method for controlling aging of ultrafiltration membrane by micro-nano bubble technology enhanced chemical cleaning |
| CN114951158A (en) * | 2022-05-31 | 2022-08-30 | 佛山市海天(宿迁)调味食品有限公司 | Method for reducing coking and scaling of soy sauce sterilization equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108970412A (en) | A kind of cleaning method of ceramic membrane | |
| CN101537315B (en) | Preparation technology of diethylene triamine pentacetic acid modified polyvinylidene fluoride separation membrane and resin | |
| CN102718359B (en) | MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and membrane component cleaning method | |
| CN108394960A (en) | A kind of electrochemical cathode micro-filtration membrane coupled reactor suitable for source water pollutant removal | |
| CN106045035A (en) | Ternary sewage treatment method coupling anaerobic acidogenesis, FO (Forward Osmosis) and MFC (Microbial Fuel Cell) | |
| CN109351203A (en) | A method of extending ceramic membrane service life | |
| CN101961605B (en) | Preparation process for diethylene triaminepentaacetic acid dianhydride modified polyvinylidene fluoride separation membrane and resin | |
| CN101502761A (en) | Technique for preparing ethylenediamine tetraacetic acid modified polyvinylidene fluoride separation membrane and resin | |
| CN215138682U (en) | Integrated device for offline cleaning and testing of water treatment membrane | |
| CN109971555A (en) | A kind of reverse osmosis membrane cleaning agent and its preparation and cleaning method | |
| CN212864421U (en) | Electroplating circuit board waste water recycling treatment facility | |
| CN112537823A (en) | Method for controlling aging of ultrafiltration membrane by micro-nano bubble technology enhanced chemical cleaning | |
| CN107721023A (en) | A kind of hydrazine hydrate wastewater treatment equipment and its technique | |
| CN205575719U (en) | Electroplating effluent recycling system | |
| JP4770633B2 (en) | Reverse osmosis membrane treatment method | |
| CN101961606B (en) | Process for preparing ethylenediaminetetraacetic dianhydride modified polyvinylidene fluoride separation membrane and resin | |
| CN110395828A (en) | A kind of cold rolling wastewater desalting system and method | |
| CN210505913U (en) | Make-up water treatment system suitable for natural gas distributed energy resource station | |
| CN114733355A (en) | Cleaning device and method for ion exchange membrane in electrodialysis membrane stack | |
| CN201249106Y (en) | Chemical cleaning device of hollow fiber filter membrane | |
| CN202449916U (en) | Membrane bioreactor based on surface-modified mesh-shaped nonwoven fabric | |
| CN206103720U (en) | A ultrafiltration system for leachate treatment | |
| CN105668870A (en) | Novel micro-discharging water purification machine | |
| CN205953609U (en) | Device that lower valency salt solution back flush alleviating milipore filter pollutes | |
| CN217594316U (en) | Cleaning device for ion exchange membrane in electrodialysis membrane stack |
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: 20181211 |
|
| RJ01 | Rejection of invention patent application after publication |