CN102284247A - Method for cleaning reverse osmosis system - Google Patents
Method for cleaning reverse osmosis system Download PDFInfo
- Publication number
- CN102284247A CN102284247A CN2010102039012A CN201010203901A CN102284247A CN 102284247 A CN102284247 A CN 102284247A CN 2010102039012 A CN2010102039012 A CN 2010102039012A CN 201010203901 A CN201010203901 A CN 201010203901A CN 102284247 A CN102284247 A CN 102284247A
- Authority
- CN
- China
- Prior art keywords
- acid
- counter
- cleaning
- cleaning fluid
- infiltration
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a method for cleaning a reverse osmosis system. The method comprises the following steps of: cleaning a reverse osmosis film with a cleaning solution which contains aqueous solution of a cleaning agent; and controlling the pH value of the cleaning solution to be 3.0+/-0.5, wherein the cleaning agent consists of mixed acid and a dirt dispersion agent, and the dirt dispersion agent is at least one of organic phosphonic acid, carboxylate homopolymer and carboxylate copolymer. The reverse osmosis film is cleaned by the method, the metallic oxide and scale pollutants slowly generating on the reverse osmosis film can be highlighted to solve, the salt content of water produced by the reverse osmosis system can be effectively reduced, the water output of the reverse osmosis system can be increased, and the pressure difference in front and behind the reverse osmosis film can be reduced.
Description
Technical field
The present invention relates to the cleaning method of reverse osmosis membrane in a kind of cleaning method of counter-infiltration system, particularly counter-infiltration system.
Background technology
Along with global water pollutes and water shortage, the high technology equipment-reverse osmosis desalination plant of water treatment (RO) from the end of the fifties U.S. develop rapidly after having made first high performance membrane.China adopts reverse osmosis desalination plant first the end of the seventies, but up to the appearance of the new film of TFC-HR high desalination in 1993, just obtains large development.Counter-infiltration be a kind of be the membrane separation technique of power by means of the function of selecting the permeability film with pressure reduction, when institute of system plus-pressure during greater than the osmotic pressure of solution, hydrone sees through film and enters central tube through producing water flow passage, at one end flows out.Enter the influent side that impurity (as ion, colloid, organic matter, bacterium) in the water is trapped within film and flow out, thereby reach the purpose of isolation of purified from dense water water side.Reverse osmosis technology is compared with technology such as traditional evaporimeter, electrodialysis, original characteristics and advantage is arranged, its total salt clearance height, water rate of recovery height, simple to operate, facility compact, easy to maintenance, can reduce labour intensity greatly, improve the operation level and the automaticity of whole water treatment technology, when uniting use, can greatly prolong the regeneration period of ion-exchange unit with ion-exchange unit, reduced the discharge capacity of soda acid, helped the conserve water resource and improve environment.At present, reverse osmosis technology has been contained nearly all industrial department, has particularly obtained using widely in multiple fields such as concentrating of desalinization, pure water preparation, boiler feedwater, wastewater treatment and drinking-water, beverage and chemical products.
Because counter-infiltration is different fully with traditional filtration, latter's water all passes through filtering layer, rely on the dirt that backwash will be dammed from filtering layer, to remove, RO then is a part of water to pass through film with the straight direction of costal fold, this moment, salt and colloidal substance concentrated on the film surface, relied on the dense water that flows with the film parallel direction that condensed matter is taken away.Reverse osmosis unit is after operation a period of time, dense water side can accumulate materials such as colloid, metal oxide, bacterium, organic matter, incrustation scale on film, causes that system's salt rejection rate descends, and water yield reduces, problems such as pressure reduction increase have just formed so-called film and have polluted.Specifically, film pollutes and is meant that the salt of suspended solid, microorganism and dissolving in the water is because of being concentrated, its concentration surpasses solubility product and generated unwanted deposit on the film surface, and these pollutions can be caused by following reason: the deposition of 1 inorganic matter (fouling), common pollutant has CaCO
3, CaSO
4, Ca
3(PO
4)
2Deng; The absorption of 2 organic molecules (organic contamination); The deposition of 3 particles (colloid pollution), common pollutant has iron hydroxide, aluminium hydroxide, silicon dioxide colloid etc.; 4 metal oxides deposition, common pollutant has iron oxide; Adhesion of 5 microorganisms and growth (biological pollution), common pollutant have bacterium, algae class.
The film pollution of reverse osmosis unit is slowly development, if do not take measures in early days, pollution will damage the performance of membrane component in the short relatively time.In the ordinary course of things, when one of following symptom appears in counter-infiltration system, show that reverse osmosis membrane is contaminated, should in time clean: under normal pressure, product discharge 10～15% of the normal value that descended; In order to keep normal product discharge, the feed pressure after temperature correction has increased by 10～15%; Product water salt transmitance increases by 10～15%.The water flux of membrane component is big more, and the rate of recovery is high more, and then vulnerable to pollution is got on its film surface.Under normal running (operation) conditions, all above-mentioned films pollute the aquifer yield that all will make reverse osmosis unit to be reduced, the pressure of supply water increase, and product water quality reduces, and increases the cleaning frequency of reverse osmosis unit, increases to produce water rate usefulness.Therefore, how to prevent or slow down reverse osmosis membrane and pollute that prolong the service life of film, the cleaning performance that improves film has become one of important subject in the current reverse osmosis technology.
In the reverse osmosis unit running, dissimilar pollutions usually takes place simultaneously, and influences each other, but at present the interaction between the dissimilar pollutions is known little about it.The reverse osmosis unit that uses in various fields is no matter how perfect it is, no matter also adopt the membrane component of which kind of type of which kind of manufacturer production, in a single day reverse osmosis unit puts into operation, in case feed liquid contacts with film, film pollutes and promptly begins, finally all need to clean, only cleaning frequency length difference.
The removal of general reverse osmosis unit pollutant can realize by physics flushing and two kinds of methods of Chemical cleaning.Physical method: if reducing has just appearred in the water permeability of film, enabled production water adopts low pressure high flow rate flushing membrane surface 20～40min, makes the water permeability of film obtain to a certain degree recovery; Chemical method: by severe contamination, after usefulness physical method cleaning performance is not obvious, adopt chemical method to clean usually at reverse osmosis membrane.When decision adopts chemical method to clean, must carry out chemical analysis, distinguish the kind of pollutant, and select corresponding chemicals and prescription according to different pollutants to pollutant.
For counter-infiltration system, no matter be that the flushing of employing physics or the method for Chemical cleaning are removed the pollutant on the reverse osmosis membrane, all suit to adopt lower operating pressure and bigger dense water flux.Only for balancing out the pressure drop from feedwater to dense water, essentially no infiltration water produces lower operating pressure, so just can reduce the again precipitation of booty on film; And bigger dense water flux can guarantee that then more cleaning fluid washes away the reverse osmosis membrane surface, and the lip-deep pollutant of reverse osmosis membrane is helpful for removing.
In addition, in the operating condition of counter-infiltration system, water temperature also is an important parameter.According to relevant theoretical, 1 ℃ of the every raising of water temperature, the permeability rate of reverse osmosis membrane can increase about 3%.In the process that counter-infiltration system is cleaned, cleaning fluid is heated to certain temperature, can be when improving the reverse osmosis membrane water permeability, significantly improve the cleaning performance of cleaning fluid for reverse osmosis membrane, but for the consideration to the reverse osmosis membrane material and the scope of application, the temperature of cleaning fluid should not be above 50 ℃.
The surface of reverse osmosis membrane is easy to be subjected to the pollution of foreign substance and produces dirt, and these foreign substances are present among the RO water inlet with various forms.Because various places source quality difference, the pretreated method that is adopted is not quite similar, so the pollutant of RO film also has nothing in common with each other.In the underground water bacterium seldom, the salt content height, iron ion exists with ferric iron and ferrous two kinds of forms, is difficult for removing by filter.
Usually mainly contain following several pollution mode with underground water (phreatic water) as the counter-infiltration system at water source: 1) calcium carbonate, the blocking microporous passage of calcium phosphate deposit; 2) the blocking microporous passage of calcium sulfate class deposit; 3) metal oxide is at the blocking microporous passage of film surface deposition.
Experimental study shows that the contamination phenomenon that various different pollutants cause is different: the deposit of calcium, its symptom are that salt rejection rate obviously descends, and system pressure drop increases, and system's aquifer yield is fallen slightly; Metal oxide, its symptom are that salt rejection rate obviously descends, and system pressure drop obviously raises, and system's aquifer yield obviously reduces.
Many chemical reagent are all effective to removing dirt and other deposits.Chemical cleaning comes down to make selected chemical agent and deposit, dirt, corrosion product and influences flux rates and produce other pollutant reactions of water water quality, impels it to break away from the film surface.Product four classes that these chemical reagent can be divided into acid, alkali, chelating agent and make by prescription.The pollutant difference that film pollutes, the cleaning agent difference of then selecting for use.Select a kind of suitable cleaning agent, can play a multiplier effect.
United States Patent (USP) 4,976,876 disclose the cleaning program that a kind of method by regular backwash is cleaned counter-infiltration system, but and not mentioned Chemical cleaning part.United States Patent (USP) 5,499,197 disclose a kind of automatic control scheme of counter-infiltration system, this cover counter-infiltration system is used to produce drinking water, by the various indexs that water is produced in the automatic control system monitoring, when the product water index that monitors was defective, the prompting counter-infiltration system that can give the alarm automatically needed to clean, and can under situation about not getting effective washing, stop the running of counter-infiltration system voluntarily, but and not mentioned concrete cleaning program.
Summary of the invention
The inventor discovers: preparation contains the cleaning fluid of mixed acid and dirt dispersion agent, adopt this cleaning fluid to clean counter-infiltration system, emphasis solves the metal oxide and the incrustation scale class that slowly take place on the reverse osmosis membrane and pollutes, can reduce the salt content that counter-infiltration system produces water effectively, improve the aquifer yield of counter-infiltration system and reduce the pressure differential of reverse osmosis membrane front and back.
The object of the present invention is to provide a kind of cleaning method of counter-infiltration system, emphasis solves the metal oxide and the incrustation scale class that slowly take place on the reverse osmosis membrane and pollutes.
For achieving the above object, the invention provides the cleaning method of counter-infiltration system, comprise with cleaning fluid and clean reverse osmosis membrane, described cleaning fluid is the aqueous solution that contains cleaning agent, and the pH value of control cleaning fluid is 3.0 ± 0.5, wherein cleaning agent is made up of mixed acid and dirt dispersion agent, and described dirt dispersion agent is to be selected from least a in organic phospho acid, homopolymer of carboxylic acid and the polymers of carboxylic acid.
Mixed acid is the mixed liquor of citric acid and sulfamic acid in the counter-infiltration system cleaning fluid of the present invention, and its mixed weight ratio is 0.5: 1-2: 1, preferred 0.8: 1-1.2: 1.
The quality that adds of mixed acid is 0.5～5% of a cleaning fluid gross mass in the counter-infiltration system cleaning fluid of the present invention, preferred 1.5～2.5%.
Dirt dispersion agent is that organic phospho acid is or/and the homopolymers of carboxylic acid or copolymer in the counter-infiltration system cleaning fluid of the present invention.
Organic phosphine acids dirt dispersion agent is at least a HEDP, ATMP, the 2-phosphonate group-1 of being selected from the counter-infiltration system cleaning fluid of the present invention, 2,4-butane tricarboxylate, hydroxyethylidene diphosphonic acid guanidine-acetic acid, ethylene diamine tetra methylene phosphonic acid, diethylene triamine pentamethylene phosphonic, to the acid of two phosphono and sulfonics, glycine two methene phosphonic acids, glutamic acid two methene phosphonic acids, sulfamic acid two methene phosphonic acids, tarine two methene phosphonic acids, be preferably 2-phosphonate group-1,2, the 4-butane tricarboxylate.
The homopolymers of carboxylic acid or copolymer analog dirt dispersion agent are at least a polyacrylic acid that is selected from the counter-infiltration system cleaning fluid of the present invention, HPMA, poly-aspartic-acid, poly-epoxy succinic acid, acrylic acid/hydroxypropyl acrylate copolymer, acrylic acid/hydroxypropyl acrylate/methyl acrylate copolymer, maleic acid (acid anhydride)/styrene sulfonic acid copolymer, acrylic acid/styrene sulfonic acid copolymer, acrylate/styrene sulfonic acid copolymer, maleic acid (acid anhydride)/allyl sulphonic acid copolymer, acrylic acid/allyl sulphonic acid copolymer, acrylic acid/vinyl sulfonic acid copolymer, acrylic acid/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer, acrylic acid/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/esters/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/maleic acid/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/2-acrylamido-2-methylpropanephosphonic acid/2-methyl-2 '-homopolymers and/or the copolymer of acrylamido propane sulfonic acid copolymer, be preferably acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer.
The concentration that adds of dirt dispersion agent is 30-200mg/L with respect to cleaning fluid in the counter-infiltration system cleaning fluid of the present invention, preferred 50-150mg/L.。
Available bases is regulated the pH value of counter-infiltration system cleaning fluid of the present invention, and described alkali can be selected NaOH, KOH or ammoniacal liquor for use, is preferably ammoniacal liquor.
When cleaning reverse osmosis membrane with cleaning fluid of the present invention, the temperature of control cleaning fluid is 10～50 ℃.
The present invention also can and/or wash reverse osmosis membrane before cleaning reverse osmosis membrane with cleaning fluid with water afterwards, and preferred water or counter-infiltration product water clean reverse osmosis membrane.Described counter-infiltration system cleaning method preferably comprises washing-cleaning fluid and washes-wash three unit.Concrete cleaning step is followed successively by:
(1) with counter-infiltration product water flushing counter-infiltration system, preferably washes 10～15min;
(2) counter-infiltration system cleaning fluid of the present invention is added system, wash cycles is preferably cleaned 1～2h;
(3) soak counter-infiltration system with cleaning fluid, preferably soak 3～6h or every immersion 20-30min, circulation 10～30min, soak with circulation timei summation be 1～6h, soak or circulation finishes the back and gets rid of cleaning fluid;
(4) with counter-infiltration product water flushing counter-infiltration system, preferably wash 10～40min.
In the process for preparation of cleaning fluid of the present invention, the order of adding of each medicament is unimportant, also can first water or counter-infiltration product water mix again after with the medicament dilution.The preferred counter-infiltration product water that uses is avoided bringing into of other polluters in the process for preparation of cleaning fluid.
Sulfamic acid easily with dirty pollutant reaction such as calcium carbonate, magnesium carbonate, calcium phosphate, can dissolve and remove various dirty classes pollutions effectively.Easy and the iron ion formation complex compound of citric acid, stronger than common acid solution de-iron ability, because of acid corrosion-resistant requirement pH 〉=2.0 of film, so institute's complex acid hydraulic control system pH value is 3.0 ± 0.5.Dirt dispersion agent is that performance well hinders calcium class dirt deposition medicament, especially the dirt dispersion agent that has very high chelating dispersive property and very high calcium tolerance and low phosphorus content, suit to be used in the effect of playing cleaning in the counter-infiltration system, stablizing and disperse, not only can improve cleaning performance but also can effectively avoid secondary pollution.Add ammoniacal liquor in the acid solution and then can overcome the phenomenon that forms the ferrous citrate of slightly solubility in the simple acid wash liquid.
Clean reverse osmosis membrane with cleaning fluid of the present invention, but emphasis solves the metal oxide and the incrustation scale class that slowly take place on the reverse osmosis membrane to be polluted, can reduce the salt content that counter-infiltration system produces water effectively, improve the aquifer yield of counter-infiltration system and reduce the pressure differential of reverse osmosis membrane front and back.
Description of drawings
Accompanying drawing is the reverse osmosis unit process chart, is the reverse osmosis water treatment method of a kind of routine in the prior art.
The specific embodiment
Describe the present invention in detail below in conjunction with drawings and Examples, but do not limit to its scope.
Former water among raw water box I and/or the raw water box II is delivered to the precipitation water tank after the booster pump supercharging, meanwhile flocculant is pumped in the settling tank by the flocculant interpolation, clear water after flocculation is delivered to the clarification water tank, add acid for adjusting pH value between 6-7 by adding sour measuring pump, add the reducing substances in the hypochlorite oxidation water and carry out sterilization by the clorox measuring pump simultaneously, and the addition by ORP detector control clorox, water outlet is sent into the filtration with manganese sand device and is filtered, filter through more medium filter and active carbon filter again, water outlet added sodium hydrogensulfite and consumes oxidizing substance excessive in the water before through security personnel's filter, and controlled the addition of sodium hydrogensulfite by the ORP detector.Water outlet is sent into intermediate water tank behind security personnel filter I and security personnel's filter II, the water of intermediate water tank further filters through security personnel's filter III after sending into the ultrafiltration apparatus filtration after the supercharging of ultrafiltration booster pump again, filtrate is sent into the first-stage reverse osmosis system after the high-pressure pump pressurization, the product water of first-stage reverse osmosis system enters flush box, and dense water is directly drained.For service time of prolongation reverse osmosis membrane, but dosing scale inhibition filtrate is sent into first-stage reverse osmosis and handled after the high-pressure pump pressurization before.The reverse osmosis water of flush box enters the two-pass reverse osmosis system after the high-pressure pump pressurization, the counter-infiltration product water that obtains enters the pure water case, and the concentrate recirculation of two-pass reverse osmosis system to first-stage reverse osmosis system carries out circular treatment.
Used former water is the regional surface water of Fangshan, Beijing swallowization in the following reverse-osmosis treated, and concrete water quality situation sees Table 1.
Table 1 raw water quality information slip
Annotate: pH does not have unit, and the unit of electrical conductivity is μ s/cm, and its counit is mg/L.
The mode that former water is described accompanying drawing by shown in the accompanying drawing and front with 200L/h water treatment amount by preceding method carries out preliminary treatment and two-pass reverse osmosis is handled, to counter-infiltration one-level mould difference increase 20% or pure water output reduce at 20% o'clock and stop.Used flocculant is an aluminium polychloride in preliminary treatment, filtrate is sent into after the high-pressure pump pressurization and is added Flocon135 (U.S. Biglake chemical Corp) antisludging agent for osmosis-reverse membrane before first-stage reverse osmosis is handled, and all uses the rolling PA membrane as reverse osmosis membrane in first-stage reverse osmosis and two-pass reverse osmosis processing.The performance indications of first-stage reverse osmosis film and two-pass reverse osmosis film see the following form 2 when putting into operation initial stage and stoppage in transit.
Embodiment 1
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 6g, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.0 with ammoniacal liquor.
Cleaning fluid with embodiment 1 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is as follows:
1) regulating counter-infiltration system one-level film pressure is 0.4MPa, and regulating the dense aquatic products amount of counter-infiltration system one-level is 160L/h, and primary reverse osmosis water output 40L/h closes the two-pass reverse osmosis film.With the counter-infiltration product water flushing counter-infiltration one-level film 12min of system;
2) cleaning fluid is heated to 30 ℃;
3) cleaning fluid after the preheating is added counter-infiltration one-level film system and extremely replace till original solution, open system circular flow 1.5h soaks 4h;
4) discharge cleaning fluid;
5) with the counter-infiltration product water flushing counter-infiltration one-level film 15min of system;
6) close counter-infiltration one-level film.Regulating counter-infiltration system secondary film pressure is 0.4MPa, and regulating the dense aquatic products amount of counter-infiltration system secondary is 160L/h, and secondary pure water output 40L/h is with the counter-infiltration product water flushing counter-infiltration secondary film 12min of system;
7) cleaning fluid is heated to 30 ℃;
8) cleaning fluid after the preheating is added counter-infiltration secondary film system, wash cycles 1.5h soaks 2h;
9) discharge cleaning fluid;
10) with the counter-infiltration product water flushing counter-infiltration secondary film 15min of system;
11) counter-infiltration one-level film, secondary film are opened simultaneously, kept one-level film pressure 0.4MPa, secondary film pressure 0.6MPa is with discharging behind the counter-infiltration product water wash cycles counter-infiltration system 20min.
Embodiment 2
Take by weighing citric acid/sulfamic acid mixed liquor 2.5Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 9g, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 6g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.1 with ammoniacal liquor.
Cleaning fluid with embodiment 2 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 3
Take by weighing citric acid/sulfamic acid mixed liquor 1.5Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 3g, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 2g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 2.9 with ammoniacal liquor.
Cleaning fluid with embodiment 3 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 4
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing HEDP 6g, poly-epoxy succinic acid 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.3 with ammoniacal liquor.
Cleaning fluid with embodiment 4 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 5
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing ethylene diamine tetra methylene phosphonic acid 6g, maleic acid/styrene sulfonic acid copolymer 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 2.8 with ammoniacal liquor.
Cleaning fluid with embodiment 5 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 6
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing glycine two methene phosphonic acids 6g, acrylic acid/2-methyl-2 '-acrylamido propane sulfonic acid copolymer 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.1 with ammoniacal liquor.
Cleaning fluid with embodiment 6 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 7
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 10g adds the 70Kg deionized water, stirs it is fully dissolved, adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.3 with ammoniacal liquor.
Cleaning fluid with embodiment 7 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 8
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 15g adds the 70Kg deionized water, stirs it is fully dissolved, adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 2.6 with ammoniacal liquor.
Cleaning fluid with embodiment 8 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 9
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 10g, add the 70Kg deionized water, stirring is fully dissolved it, adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 2.7 with ammoniacal liquor.
Cleaning fluid with embodiment 9 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 10
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 15g, add the 70Kg deionized water, stirring is fully dissolved it, adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.00 with ammoniacal liquor.
Cleaning fluid with embodiment 10 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 11
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 6g, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.4 with ammoniacal liquor.
Cleaning fluid with embodiment 11 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and the temperature of cleaning fluid is 15 ℃, and all the other cleaning methods are with embodiment 1.
Embodiment 12
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 6g, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.4 with ammoniacal liquor.
Cleaning fluid with embodiment 12 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and the temperature of cleaning fluid is 45 ℃, and all the other cleaning methods are with embodiment 1.
Embodiment 13
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 6g, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 2.8 with NaOH.
Cleaning fluid with embodiment 13 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Embodiment 14
Take by weighing citric acid/sulfamic acid mixed liquor 2Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, take by weighing 2-phosphonate group-1,2,4-butane tricarboxylate 6g, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer 4g, add the 70Kg deionized water, stirring is fully dissolved it, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 2.9 with KOH.
Cleaning fluid with embodiment 14 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Comparative Examples 1
Take by weighing citric acid 2Kg, 2-phosphonate group-1,2,4-butane tricarboxylate 10g adds the 70Kg deionized water, stirs it is fully dissolved, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.0 with ammoniacal liquor.
Cleaning fluid with Comparative Examples 1 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Comparative Examples 2
Take by weighing sulfamic acid 2Kg, 2-phosphonate group-1,2,4-butane tricarboxylate 10g adds the 70Kg deionized water, stirs it is fully dissolved, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 3.0 with ammoniacal liquor.
Cleaning fluid with Comparative Examples 2 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Comparative Examples 3
Take by weighing citric acid/sulfamic acid mixed liquor 3Kg, wherein the part by weight of citric acid and sulfamic acid is 1: 1, adds the 70Kg deionized water, stirs it is fully dissolved, and adding deionized water to solution weight is 100Kg, promptly obtains required counter-infiltration cleaning fluid 100Kg.And the pH value of cleaning fluid is adjusted to 2.9 with ammoniacal liquor.
Cleaning fluid with Comparative Examples 3 carries out the segmentation cleaning to the two-stage two-segment counter-infiltration, and concrete cleaning process is with embodiment 1.
Comparative Examples 4
Cleaning fluid is a counter-infiltration product water.Concrete cleaning process is with embodiment 1.
After pressing preceding method reverse osmosis membrane is cleaned with the cleaning fluid of embodiment or Comparative Examples, the mode that former water is described accompanying drawing by shown in the accompanying drawing and front with 200L/h water treatment amount by preceding method is carried out preliminary treatment and two-pass reverse osmosis processing again, and the performance indications of first-stage reverse osmosis film and two-pass reverse osmosis film see the following form 2 when putting into operation once more.
The main performance index of table 2 reverse osmosis membrane
Annotate: the unit of pure water flow, concentrated stream amount is L/h, and pressure drop unit is Mpa, and electrical conductivity unit is μ s/cm.
As can be seen from Table 2, clean counter-infiltration system with cleaning fluid of the present invention, cleaning performance obviously strengthens. as seen, cleaning agent adopts sour mixed liquor and dirt dispersion agent can significantly strengthen the cleaning performance of cleaning fluid, reduce reverse osmosis membrane front and back pressure, recover pure water flux and reduce product electrical conductivity of water, particularly pure water flux to have obtained good recovery.
Claims (11)
1. the cleaning method of a counter-infiltration system, comprise with the counter-infiltration system cleaning fluid and clean reverse osmosis membrane, described counter-infiltration system cleaning fluid is the aqueous solution that contains cleaning agent, and the pH value of control cleaning fluid is 3.0 ± 0.5, wherein cleaning agent is made up of mixed acid and dirt dispersion agent, and described dirt dispersion agent is to be selected from least a in organic phospho acid, homopolymer of carboxylic acid and the polymers of carboxylic acid.
2. the cleaning method of counter-infiltration system according to claim 1 is characterized in that with alkali the pH value of cleaning fluid being transferred to 3.0 ± 0.5, and described alkali is preferably NaOH, KOH or ammoniacal liquor, most preferably is ammoniacal liquor.
3. the cleaning method of counter-infiltration system according to claim 1 and 2 is characterized in that described mixed acid is the mixture of citric acid and sulfamic acid, and citric acid and sulfamic acid weight ratio are 0.5: 1-2: 1, be preferably 0.8: 1-1.2: 1.
4. according to the cleaning method of each described counter-infiltration system of claim 1-3, the dosage that it is characterized in that mixed acid is 0.5～5 weight % of cleaning fluid total amount, preferred 1.5～2.5 weight %.
5. according to the cleaning method of each described counter-infiltration system of claim 1-4, it is characterized in that described organic phospho acid is at least a HEDP, ATMP, the 2-phosphonate group-1 of being selected from, 2,4-butane tricarboxylate, hydroxyethylidene diphosphonic acid guanidine-acetic acid, ethylene diamine tetra methylene phosphonic acid, diethylene triamine pentamethylene phosphonic, to the compound of two phosphono and sulfonics, glycine two methene phosphonic acids, glutamic acid two methene phosphonic acids, sulfamic acid two methene phosphonic acids, tarine two methene phosphonic acids, be preferably 2-phosphonate group-1,2, the 4-butane tricarboxylate.
6. according to the cleaning method of each described counter-infiltration system of claim 1-5, the homopolymers or the copolymer that it is characterized in that described carboxylic acid are at least a polyacrylic acid that is selected from, HPMA, poly-aspartic-acid, poly-epoxy succinic acid, acrylic acid/hydroxypropyl acrylate copolymer, acrylic acid/hydroxypropyl acrylate/methyl acrylate copolymer, maleic acid/styrene sulfonic acid copolymer, maleic anhydride/styrene sulfonic acid copolymer, acrylic acid/styrene sulfonic acid copolymer, acrylate/styrene sulfonic acid copolymer, maleic acid/allyl sulphonic acid copolymer, maleic anhydride/allyl sulphonic acid copolymer acrylic acid/allyl sulphonic acid copolymer, acrylic acid/vinyl sulfonic acid copolymer, acrylic acid/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer, acrylic acid/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/esters/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/maleic acid/2-methyl-2 '-acrylamido propane sulfonic acid copolymer, acrylic acid/2-acrylamido-2-methylpropanephosphonic acid/2-methyl-2 '-copolymer of acrylamido propane sulfonic acid copolymer, be preferably acrylic acid/hydroxypropyl acrylate/2-acrylamide-2-methyl-propyl sulfonic acid copolymer.
7. according to the cleaning method of each described counter-infiltration system of claim 1-6, it is characterized in that the concentration that adds of dirt dispersion agent is 30-200mg/L with respect to cleaning fluid, preferred 50-150mg/L.
8. according to the cleaning method of each described counter-infiltration system of claim 1-7, when it is characterized in that with cleaning fluid cleaning reverse osmosis membrane, the temperature of control cleaning fluid is 10～50 ℃.
9. according to the cleaning method of each described counter-infiltration system of claim 1-8, it is characterized in that before cleaning reverse osmosis membrane and/or wash reverse osmosis membrane afterwards with water with cleaning fluid, preferably clean reverse osmosis membrane with counter-infiltration product water.
10. according to the cleaning method of the described counter-infiltration system of claim 9, it is characterized in that described cleaning comprises that washing-cleaning fluid washes-wash three unit.
11., it is characterized in that cleaning step is followed successively by according to the described counter-infiltration system cleaning method of claim 10:
(1) with counter-infiltration product water flushing counter-infiltration system, preferably washes 10～15min;
(2) the counter-infiltration system cleaning fluid is added system, wash cycles is preferably cleaned 1～2h;
(3) soak counter-infiltration system with cleaning fluid, preferably soak 3～6h or every immersion 20-30min, circulation 10～30min, soak with circulation timei summation be 1～6h, soak or circulation finishes the back and gets rid of cleaning fluid.
(4) with counter-infiltration product water flushing counter-infiltration system, preferably wash 10～40min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102039012A CN102284247A (en) | 2010-06-21 | 2010-06-21 | Method for cleaning reverse osmosis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102039012A CN102284247A (en) | 2010-06-21 | 2010-06-21 | Method for cleaning reverse osmosis system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102284247A true CN102284247A (en) | 2011-12-21 |
Family
ID=45331163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102039012A Pending CN102284247A (en) | 2010-06-21 | 2010-06-21 | Method for cleaning reverse osmosis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102284247A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658035A (en) * | 2012-05-09 | 2012-09-12 | 首钢总公司 | Method for preventing organic matters from polluting and blocking water treatment membrane |
| CN105709604A (en) * | 2015-08-13 | 2016-06-29 | 常州联江环保科技有限公司 | Acidic cleaning agent applicable to ultra-filtration membranes or reverse osmosis membranes |
| CN106630011A (en) * | 2015-11-04 | 2017-05-10 | 杭州天创环境科技股份有限公司 | Combined cleaning method of water reuse reverse osmosis system for printing and dyeing wastewater |
| CN107032509A (en) * | 2017-03-14 | 2017-08-11 | 成都云图控股股份有限公司 | A kind of terpolymer concentration slow-release scale inhibitor and preparation method thereof |
| CN107735365A (en) * | 2015-07-09 | 2018-02-23 | 栗田工业株式会社 | Cool down the recovery method and retracting device of draining |
| CN107789989A (en) * | 2017-11-24 | 2018-03-13 | 内蒙古农业大学 | A kind of preventative method for disinfection of reverse osmosis membrane whole process |
| CN108159885A (en) * | 2018-02-23 | 2018-06-15 | 珠海市城市排水有限公司 | A kind of PVDF ultrafiltration membrane inorganic pollution cleaning agent and cleaning method |
| CN108211806A (en) * | 2018-01-19 | 2018-06-29 | 广州水蓝环保科技有限公司 | A kind of without phosphorus become imitates scale inhibition film chemical agent |
| CN109289538A (en) * | 2017-07-25 | 2019-02-01 | 中国石油化工股份有限公司 | A kind of method of in-site chemical cleaning reverse osmosis membrane |
| US11292992B2 (en) | 2017-10-23 | 2022-04-05 | Dow Global Technologies Llc | Gradient copolymers for use in automatic dishwashing systems |
| CN114367200A (en) * | 2021-12-30 | 2022-04-19 | 上海丰信环保科技有限公司 | Cleaning agent and cleaning method for wastewater recycling membrane system in mineral processing industry |
| CN114380442A (en) * | 2021-12-24 | 2022-04-22 | 湖南艾迪奥电子科技有限公司 | MLCC surface treatment wastewater quality-based treatment and heavy metal zero-discharge method |
| CN115072885A (en) * | 2022-07-14 | 2022-09-20 | 欣格瑞（山东）环境科技有限公司 | Nanofiltration concentrated solution modifier and preparation method thereof |
| CN115228297A (en) * | 2022-07-15 | 2022-10-25 | 华北电力科学研究院有限责任公司 | Reverse osmosis automatic cleaning method and system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006055784A (en) * | 2004-08-23 | 2006-03-02 | Asahi Kasei Corp | Method for cleaning porous separation membrane |
| JP2006263510A (en) * | 2005-03-22 | 2006-10-05 | Kurita Water Ind Ltd | Slime preventing agent for membrane separation and membrane separation method |
| CN1864826A (en) * | 2006-04-27 | 2006-11-22 | 天津化工研究设计院 | A scale inhibitor for reverse osmosis membrane |
| CN101172721A (en) * | 2006-10-31 | 2008-05-07 | 湖州欧美化学有限公司 | Antisludging agent of reverse osmosis water treatment system |
| US20080169006A1 (en) * | 2007-01-16 | 2008-07-17 | Musale Deepak A | Method of cleaning fouled or scaled membranes |
| CN101352655A (en) * | 2008-08-14 | 2009-01-28 | 李洪社 | Scale inhibitor of reverse osmosis membrane and preparation method thereof |
| CN101455945A (en) * | 2007-12-13 | 2009-06-17 | 中芯国际集成电路制造(上海)有限公司 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
| CN101721916A (en) * | 2008-10-24 | 2010-06-09 | 中国石油化工股份有限公司 | Chemical cleaning method of reverse osmosis membrane |
-
2010
- 2010-06-21 CN CN2010102039012A patent/CN102284247A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006055784A (en) * | 2004-08-23 | 2006-03-02 | Asahi Kasei Corp | Method for cleaning porous separation membrane |
| JP2006263510A (en) * | 2005-03-22 | 2006-10-05 | Kurita Water Ind Ltd | Slime preventing agent for membrane separation and membrane separation method |
| CN1864826A (en) * | 2006-04-27 | 2006-11-22 | 天津化工研究设计院 | A scale inhibitor for reverse osmosis membrane |
| CN101172721A (en) * | 2006-10-31 | 2008-05-07 | 湖州欧美化学有限公司 | Antisludging agent of reverse osmosis water treatment system |
| US20080169006A1 (en) * | 2007-01-16 | 2008-07-17 | Musale Deepak A | Method of cleaning fouled or scaled membranes |
| CN101455945A (en) * | 2007-12-13 | 2009-06-17 | 中芯国际集成电路制造(上海)有限公司 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
| CN101352655A (en) * | 2008-08-14 | 2009-01-28 | 李洪社 | Scale inhibitor of reverse osmosis membrane and preparation method thereof |
| CN101721916A (en) * | 2008-10-24 | 2010-06-09 | 中国石油化工股份有限公司 | Chemical cleaning method of reverse osmosis membrane |
Non-Patent Citations (3)
| Title |
|---|
| 周军等: "反渗透膜污染及其清洗的研究", 《过滤与分离》 * |
| 张青松等: "反渗透膜的污染及清洗", 《广东化工》 * |
| 马丽萍: "反渗透膜的污染与清洗", 《石油化工应用》 * |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658035A (en) * | 2012-05-09 | 2012-09-12 | 首钢总公司 | Method for preventing organic matters from polluting and blocking water treatment membrane |
| CN107735365A (en) * | 2015-07-09 | 2018-02-23 | 栗田工业株式会社 | Cool down the recovery method and retracting device of draining |
| CN107735365B (en) * | 2015-07-09 | 2020-11-13 | 栗田工业株式会社 | Method and apparatus for recovering cooling drainage |
| CN105709604A (en) * | 2015-08-13 | 2016-06-29 | 常州联江环保科技有限公司 | Acidic cleaning agent applicable to ultra-filtration membranes or reverse osmosis membranes |
| CN106630011A (en) * | 2015-11-04 | 2017-05-10 | 杭州天创环境科技股份有限公司 | Combined cleaning method of water reuse reverse osmosis system for printing and dyeing wastewater |
| CN107032509A (en) * | 2017-03-14 | 2017-08-11 | 成都云图控股股份有限公司 | A kind of terpolymer concentration slow-release scale inhibitor and preparation method thereof |
| CN109289538A (en) * | 2017-07-25 | 2019-02-01 | 中国石油化工股份有限公司 | A kind of method of in-site chemical cleaning reverse osmosis membrane |
| US11292992B2 (en) | 2017-10-23 | 2022-04-05 | Dow Global Technologies Llc | Gradient copolymers for use in automatic dishwashing systems |
| CN107789989A (en) * | 2017-11-24 | 2018-03-13 | 内蒙古农业大学 | A kind of preventative method for disinfection of reverse osmosis membrane whole process |
| CN107789989B (en) * | 2017-11-24 | 2021-06-01 | 内蒙古农业大学 | Reverse osmosis membrane full-process preventive sterilization method |
| CN108211806A (en) * | 2018-01-19 | 2018-06-29 | 广州水蓝环保科技有限公司 | A kind of without phosphorus become imitates scale inhibition film chemical agent |
| CN108159885A (en) * | 2018-02-23 | 2018-06-15 | 珠海市城市排水有限公司 | A kind of PVDF ultrafiltration membrane inorganic pollution cleaning agent and cleaning method |
| CN108159885B (en) * | 2018-02-23 | 2020-10-30 | 珠海市城市排水有限公司 | PVDF ultrafiltration membrane inorganic pollution cleaning agent and cleaning method |
| CN114380442A (en) * | 2021-12-24 | 2022-04-22 | 湖南艾迪奥电子科技有限公司 | MLCC surface treatment wastewater quality-based treatment and heavy metal zero-discharge method |
| CN114367200A (en) * | 2021-12-30 | 2022-04-19 | 上海丰信环保科技有限公司 | Cleaning agent and cleaning method for wastewater recycling membrane system in mineral processing industry |
| CN115072885A (en) * | 2022-07-14 | 2022-09-20 | 欣格瑞（山东）环境科技有限公司 | Nanofiltration concentrated solution modifier and preparation method thereof |
| CN115072885B (en) * | 2022-07-14 | 2022-11-15 | 欣格瑞（山东）环境科技有限公司 | Nanofiltration concentrated solution modifier and preparation method thereof |
| CN115228297A (en) * | 2022-07-15 | 2022-10-25 | 华北电力科学研究院有限责任公司 | Reverse osmosis automatic cleaning method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102284247A (en) | Method for cleaning reverse osmosis system | |
| CN102285705B (en) | Method for cleaning reverse osmosis system | |
| CN102826686B (en) | Double-membrane treatment method of iron and steel industrial wastewater | |
| CN100450592C (en) | Metal smelting factory sewage reclaiming method based on membrane filtering technique | |
| CN103539288B (en) | Industrial wastewater recovery method and wastewater recovery system | |
| CN103143260B (en) | Cleaning agent composition and cleaning method for reverse osmosis membrane | |
| CN201817357U (en) | Full-reuse treatment device for coking wastewater through Fenton oxidation and double-membrane process | |
| CN102417253B (en) | In-depth treatment zero-discharge recovery equipment for heavy metal waste water | |
| CN204848545U (en) | Electroplating effluent retrieves zero discharging equipment | |
| CN100457645C (en) | Zero discharge and circular utilization method of industrial effluent in regeneration treatment | |
| CN103143262A (en) | Cleaning agent composition and cleaning method for reverse osmosis membrane | |
| CN210030227U (en) | Concentration treatment device for chemical nickel plating rinsing wastewater | |
| CN104529018A (en) | Process for treating and recycling printing and dyeing wastewater by virtue of electro-coagulation | |
| CN201610402U (en) | Recycling and deep treatment device for electronic electroplating wastewater | |
| CN103143263B (en) | Cleaning agent composition and cleaning method for reverse osmosis membrane | |
| CN112028270A (en) | Concentration treatment device and treatment method for chemical nickel plating rinsing wastewater | |
| CN103143261B (en) | Cleaning agent composition and cleaning method for reverse osmosis membrane | |
| CN202265468U (en) | Equipment for deeply treating and recovering heavy metal waste water with zero discharge | |
| CN112028273A (en) | High-recovery-rate reclaimed water recycling advanced treatment system and treatment method | |
| CN203498181U (en) | System for recycling waste acid and waste alkali | |
| CN207958039U (en) | A kind of pickle liquor Treatment and recovery utilizes device | |
| CN106430701A (en) | High-salinity water purifying treatment system | |
| CN110330140A (en) | Saline and alkaline region water pollution improvement and system for regenerating and recycling and method | |
| CN109775899A (en) | The recovery method of nickel in a kind of stainless steel acid cleaning waste water | |
| CN211394158U (en) | Electroplating effluent zero release sewage treatment plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111221 |