CN102210978A - Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode - Google Patents
Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode Download PDFInfo
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- CN102210978A CN102210978A CN2011100604050A CN201110060405A CN102210978A CN 102210978 A CN102210978 A CN 102210978A CN 2011100604050 A CN2011100604050 A CN 2011100604050A CN 201110060405 A CN201110060405 A CN 201110060405A CN 102210978 A CN102210978 A CN 102210978A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
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- 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
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- 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
- B01D65/025—Removal of membrane elements before washing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/40—Automatic control of cleaning processes
Abstract
The invention discloses a method and reagent for cleaning and repairing a discarded reverse osmosis film in an offline mode, which are used for washing and repairing reverse osmosis film fouling of different types, solve the problem of non-thorough cleaning caused by the original crude cleaning mode, initiatively develop a repairing reagent and method of a damage film and fill domestic gaps in the aspect. Various parameters of the film obtained by cleaning and repairing with the method and the reagent approach those of a new film more closely, the film repair rate is greatly strengthened, the pertinence is higher, and the defect of chemically damaging a perfect film in the traditional cleaning method is avoided at the same time. The method and the reagent for cleaning and repairing the discarded reverse osmosis film in the offline mode can ensure that the performance of the washed film reaches or approaches that of the new film more closely, greatly reduce the film consumption cost of an enterprise, ensure non-interference of production and film cleaning and avoid the damage to a normal film during online chemical cleaning.
Description
Technical field
The present invention relates to electrochemical analysis, the screening of Chemical cleaning reagent, formulation field, cleaning, restorative procedure and the reagent of particularly waste and old reverse osmosis membrane under off-line state.
Background technology
All having adopted reverse osmosis technology, reverse osmosis membrane in the purified water preparation of every field (food, pharmacy, electric power, running water etc.) at present is the core of counter-infiltration system, the whether good performance that directly influences counter-infiltration system of its service behaviour.
Counter-infiltration system is after operation a period of time, the film surface can generate bacterium layer, metal dirt, silicon dirt and other organic and inorganic pollutant of indissoluble, cause the increase of counter-infiltration system inlet pressure, aquifer yield to reduce, produce water conductivity and rise, influence product water water quality, reverse osmosis membrane consumes high.
According to present technology, to the online simple cleaning technique of the most of employing of waste and old reverse osmosis membrane, and this kind mode can cause an obstruction just must carry out Chemical cleaning to all films (comprising still normal film) for many films in the many film pipes, the film not bad to function produces unnecessary chemical damage, prior art is not carried out specialty analysis to different fouling situations and water quality, also do not carry out the chemical analysis of specialty at different dirty classes, provide proprietary formula, this will cause a kind of comparatively rough film cleaning way, clean the back effect and be difficult to guarantee.
Find that the desalination performance suppression ratio of reverse osmosis membrane is more serious on the basis to waste and old reverse osmosis membrane and the analysis of film dirt, reverse osmosis membrane has the perforation phenomenon, and chemical reparation has been carried out on the reverse osmosis membrane surface, increases substantially film desalination performance demands to reach.Prior art does not relate to the restorative procedure that damages film at present, and research herein still is blank.
Summary of the invention
The object of the invention has been to disclose a kind of waste and old targetedly reverse osmosis membrane off-line type that carries out drawing behind the specialty analysis at different fouling situations and water quality and has cleaned method and the reagent of repairing.
The present invention seeks to be achieved by the following scheme:
The reagent that the waste and old reverse osmosis membrane off-line type of the present invention cleans is:
Prescription one, for inorganic salt crust class, the reagent that waste and old reverse osmosis membrane off-line type cleans is 0.1-0.5%HCl solution, cleaning condition is: pH value 1-4, temperature＜38 ℃; Wherein, described inorganic salt crust class is preferably the calcium dirt.
Prescription two, for metal oxide dirt class, the reagent that waste and old reverse osmosis membrane off-line type cleans is 0.6-1.2%Na
2S
2O
4Solution, cleaning condition is: temperature＜35 ℃; Wherein, described metal oxide dirt class is preferably iron or/and the aluminium dirt.
Prescription three, for the dirty class that is insoluble to acid, the reagent that waste and old reverse osmosis membrane off-line type cleans is 0.08-0.14%NaOH solution and 0.8-1.3%Na
4The mixed solution of EDTA solution, mixed proportion is: 1: 1, cleaning condition was: pH value 11-12, temperature＜30 ℃; Wherein, the described dirty class that is insoluble to acid is preferably CaF
2, BaSO
4, SrSO
4Or CaSO
4
Prescription four, for inorganic colloid dirt class, silicon dirt or microorganism dirt class, the reagent that waste and old reverse osmosis membrane off-line type cleans is the mixed solution of 0.08-0.14%NaOH solution and 0.020-0.029% dodecyl sodium sulfate (Na-SDS), mixed proportion is: 1: 1, cleaning condition is: pH value 11-12, temperature＜30 ℃; Wherein, described inorganic colloid dirt class is preferably mud.
Prescription five, for organic matter dirt class, the reagent that waste and old reverse osmosis membrane off-line type cleans is the mixed solution of 0.08-0.14%NaOH solution and 0.020-0.029%Na-SDS solution, mixed proportion: 1: 1, cleaning condition is: pH value 11-12, temperature＜30 ℃, use the 0.1-0.5%HCl acidic cleaning solution after the alkali cleaning, cleaning condition is: pH value 1-2, temperature＜38 ℃.
The waste and old reverse osmosis membrane off-line type of the present invention is repaired reagent: the U.S. wins the pore former MXFJ-400 that Da Yake skill Co., Ltd produces, and lot number is: FJ-090708DT.
The waste and old reverse osmosis membrane off-line type of the present invention cleans the method for repairing and comprises the steps:
(1) to the dirty constituent analysis of the film of waste and old reverse osmosis membrane, step is: the trapped substance sample of at first gathering waste and old reverse osmosis membrane surface, use chemical analysis, ESEM (SEM) analysis, X diffractometer identification and analysis trapped substance sample respectively, the dirty class that forms in the waste and old reverse osmosis membrane is characterized and analyzes, and the affirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical methodes, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, finally draw the film dirt constituent analysis result of waste and old reverse osmosis membrane;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, prosthetic appliance (see figure 7), use is at the waste and old reverse osmosis membrane cleaning agent of the present invention and the renovation agent of above-mentioned different film dirt, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is normal temperature for the running water water temperature, clean and repair to reaching criterion of acceptability: the desalination rate reaches more than 85.0%, the water rate of recovery reaches more than 12%, and pressure reduction is lower than 0.2MPa.
Wherein, color, the density of residue on the described test counter-infiltration diaphragm that utilizes the SDI instrument, judge that dirt is categorized as: the brown residue is the iron dirt; White residue is silicon, dauk, calcium dirt; The crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant is thick judgement, also contains biofouling or organic dirt.
Wherein, described film properties relevant parameter comprises the desalination rate, the water rate of recovery, and pressure reduction, computational methods are desalination rate=(the Ei-Eo)/Ei water rate of recovery=Vo/Vi pressure reduction=Pi-Po, wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Wherein, definite method of described criterion of acceptability is:
(1) in cleaning repair process, be the running water of electrical conductivity at 450-550 μ s/cm at medium, measuring pressure is 1.5MPa, and measuring temperature is under the normal temperature condition for the running water water temperature, measures the various performance parameters of new reverse osmosis membrane and waste and old reverse osmosis membrane respectively;
(2) parameters that measures is compared, difference mainly contains: 1. pressure reduction raises, and the pressure reduction of new reverse osmosis membrane is 0.1MPa, and the initial pressure reduction of waste and old reverse osmosis membrane is all far above 0.2MPa; 2. the water rate of recovery descends, and the water rate of recovery of new reverse osmosis membrane is 15%, and the water rate of recovery of waste and old reverse osmosis membrane is 10%; 3. the desalination rate descends; New film desalination rate is generally greater than 99%, and the desalination rate of waste and old reverse osmosis membrane descends a lot, generally is lower than 80%;
(3) clean respectively at various dirty class, under same test condition, carry out the measurement of parameters;
The performance of waste and old reverse osmosis membrane after (4) contrast is cleaned and new reverse osmosis membrane, and each parameter demarcated, suitable up to the performance that reaches both, established the waste and old reverse osmosis membrane of the present invention and cleaned the criterion of acceptability of repairing: the desalination rate reaches more than 85.0%, the water rate of recovery reaches more than 12%, and pressure reduction is lower than 0.2MPa.
Wherein, described waste and old reverse osmosis membrane cleaning, prosthetic appliance can be that following structure is seen Figure of description 7:
This equipment is mainly by valve, flowmeter, conductivity meter, Pressure gauge and water inlet instrument pH, force (forcing) pump P and accurate filter PP1 and PP2 form, and described valve is by filter core exhaust-valve V0, water valve V1 from the beginning, running water inlet valve V2, running water outlet valve V3, acid lotion water intaking valve V4, basic lotion water intaking valve V5, renovation agent water intaking valve V6, total water intaking valve V7, old film water intaking valve V8, the dense water out valve of old film V9, old film short valve V10, system pure water-Xin film water intaking valve V11, old film water outlet valve V12, new film water intaking valve V13, the new dense water out valve of film V14, new film short valve V15, fresh water drain valve V16, concentrated water discharge valve V17, renovation agent concentrate recirculation valve V18, renovation agent fresh water return valve V19, alkali cleaning concentrate recirculation valve V20, alkali cleaning fresh water return valve V21, pickling fresh water return valve V22, pickling concentrate recirculation valve V23, dense water check (non-return) valve V24, V25, V26, V27, discharging of waste liquid valve V28 forms; Described flowmeter is made up of old film flow of inlet water meter F1, new film flow of inlet water meter F2, old film fresh-water flow meter F3 and new film fresh-water flow meter F4; Described conductivity meter is made up of old film water inlet conductivity meter E1, new film water inlet conductivity meter E2 and old film fresh water conductivity meter E3; Described Pressure gauge is made up of water inlet gross pressure table P1, new film inlet gage P2 and new film delivery gauge P3;
Accurate filter PP1 inlet passes through from the beginning, and water valve V1 is connected with the municipal tap water pipe, outlet is connected with city water tank 1 import by running water inlet valve V2, city water tank 1, acid cleaning tank 2, alkali cleaning case 3,4 outlets of renovation agent case are respectively by running water outlet valve V3, acid lotion water intaking valve V4, basic lotion water intaking valve V5, renovation agent water intaking valve V6 links to each other with force (forcing) pump 5 water inlets, the old film water inlet of middle serial connection conductivity meter E1, water inlet instrument pH, the outlet of force (forcing) pump 5 is by total water intaking valve V7, old film water intaking valve V8, old film flow of inlet water meter F1 links to each other with waste and old RO film 6 imports, simultaneously by old film short valve V10, new film flow of inlet water meter F2, new film water intaking valve V13 links to each other with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2, waste and old RO film 6 dense water outs are by the dense water out valve of old film V9, new film flow of inlet water meter F2, new film water intaking valve V13 links to each other with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2, link to each other with PP2 accurate filter inlet by new film short valve V15 simultaneously, waste and old RO film water outlet is by old film water outlet valve V12, old film fresh-water flow meter F3, renovation agent fresh water return valve V19, alkali cleaning fresh water return valve V21, pickling fresh water return valve V22 respectively with renovation agent case 4, alkali cleaning case 3, acid cleaning tank 2 imports link to each other, the old film fresh water conductivity meter E3 of middle serial connection, end meets fresh water drain valve V16, link to each other with new film 7 imports by system pure water-Xin film water intaking valve V11 simultaneously, new RO film 7 dense water outs are by the dense water out valve of new film V14, dense water check (non-return) valve V24 links to each other with accurate filter PP2 inlet, the new film delivery gauge P3 of middle serial connection, new RO film 7 water outlets are by new film fresh-water flow meter F4, renovation agent dilute side return valve V19, alkali cleaning fresh water return valve V21, pickling fresh water return valve V22 respectively with renovation agent case 4, alkali cleaning case 3, acid cleaning tank 2 imports link to each other, end meets fresh water drain valve V16, the outlet of PP2 accurate filter is by renovation agent concentrate recirculation valve V18, alkali cleaning concentrate recirculation valve V20, pickling concentrate recirculation valve V23 respectively with renovation agent case 4, alkali cleaning case 3, acid cleaning tank 2 imports link to each other, and end meets concentrated water discharge valve V17.
Waste and old reverse osmosis membrane off-line type disclosed by the invention cleans restorative procedure and reagent, different types of reverse osmosis membrane dirt class is cleaned reparation targetedly, solved the halfway problem of cleaning that former rough formula cleaning way causes, and researched and developed reparation reagent and the method for damaging film in a creative way, filled up domestic blank in this regard.This method and reagent clean the more approaching new film of parameters of repairing the film that obtains, and the film repair rate strengthens greatly, and specific aim is higher, have avoided the drawback of in the existing cleaning method intact membrance chemistry being damaged simultaneously.Off-line of the present invention cleans method and the reagent of repairing waste and old reverse osmosis membrane, can guarantee that the performance after film cleans reaches or approaching new film, greatly reduce enterprise's film consuming cost, guaranteed that the cleaning of production and film is independent of each other, and has stopped the damage of online Chemical cleaning to normal film.
Following experimental example and embodiment are used to further specify but are not limited to the present invention
Experimental example
Experimental example 1 each metal ion species is to the Effect on Performance of renovation agent MXFJ-400
(1) solution of repairing waste and old reverse osmosis membrane front and back with MXFJ-400 being carried out ultraviolet characterizes
The solution of repairing waste and old reverse osmosis membrane front and back with MXFJ-400 is carried out ultraviolet characterize result such as Fig. 2.From ultraviolet spectrogram as can be seen, repair the preceding MXFJ-400 of waste and old reverse osmosis membrane and have two maximum absorption bands, and 213nm place absworption peak absorbs peak height than the 272nm place at 213nm and 272nm place; Also there is maximum absorption band in remaining MXFJ-400 solution at 213nm and 272nm place after repairing waste and old reverse osmosis membrane, but its UV absorption at the 213nm place diminishes, and the UV absorption at the 272nm place becomes big.The back adds some common metal ions in the MXFJ-400 aqueous solution, to investigate the influence of common metal ion to MXFJ-400.
(2) influence of the various ion pair renovation agent MXFJ-400 of investigation
Fe
3+Influence to MXFJ-400
In the MXFJ-400 aqueous solution, add Fe
3+, find original water white MXFJ-400 aqueous solution browning look.The MXFJ-400 solution that adds different amounts is carried out uv scan, as shown in Figure 3, from spectrogram as can be seen, add Fe
3+Tangible red shift takes place in the MXFJ-400 ultraviolet absorption peak afterwards, and reduces significantly in the UV absorption at 213nm and 272nm place; MXFJ-400 is to Fe in this explanation
3+Has very strong chelation, if a large amount of Fe is contained on the film surface
3+, the valid density of MXFJ-400 sharply reduces in the time of can causing chemistry to be repaired, and causes its repair ability to descend.So in to waste and old reverse osmosis membrane repair process, the iron dirt on film surface thoroughly need be cleaned, the water that liquid is repaired in preparation also will remove Fe
3+Handle.
Al
3+Influence to MXFJ-400
In MXFJ-400, add Al
3+, this mixed liquor is carried out uv scan.The result as shown in Figure 4.As can be seen from the figure in MXFJ-400, add Al
3+Remarkable red shift has taken place in the ultraviolet maximum absorption band afterwards, and the UV absorption at 213nm and 272nm place reduces simultaneously.MXFJ-400 is to Al in this explanation
3+Chelation is arranged.Al
3+Exist and also can make the valid density of MXFJ-400 descend.Therefore, the water of preparation MXFJ-400 need remove Al
3+Handle, the Al dirt on waste and old reverse osmosis membrane surface also need thoroughly be removed before cleaning.
Ca
2+Influence to MXFJ-400
In the MXFJ-400 aqueous solution, add Ca
2+, mixed solution is carried out uv scan, the result is as shown in Figure 5.As can be seen from the figure, in MXFJ-400, add Ca
2+After the red shift of ultraviolet absorption peak does not take place, the UV absorption intensity at 213nm and 272nm place also remains unchanged substantially simultaneously.This illustrates Ca
2+Little to the MXFJ-400 influence.Can not consider Ca during preparation MXFJ-400
2+Influence.
Zn
2+Influence to MXFJ-400
In the MXFJ-400 aqueous solution, add Zn
2+, mixed solution is carried out uv scan, the result is as shown in Figure 6.As can be seen from the figure, add Zn
2+After, the maximum absorption band of MXFJ-400 does not change.In addition, the UV absorption at 213nm and 272nm place of MXFJ-400 all strengthens.This illustrates Zn
2+MXFJ-400 there is synergistic effect, Zn
2+To a certain extent MXFJ-400 is activated, make the valid density of MXFJ-400 be improved.So, in the repair process of waste and old counter-infiltration, can add Zn
2+To improve the repair ability of MXFJ-400.
The present invention, need remove the Fe and the Al dirt class on film surface earlier when using it that waste and old reverse osmosis membrane is repaired by the performance study to renovation agent MXFJ-400, and the solvent of preparing renovation agent simultaneously also needs to remove Fe wherein
3And Al
3+Ca
2+Little to the renovation agent influence.Zn
2+Can increase the ability of renovation agent, carry out in renovation agent, to add Zn when reverse osmosis membrane is repaired
2+
Description of drawings
Fig. 1. film dirt crystal structure pattern amplifies 1000 times of figure and amplifies 5000 times of figure
Fig. 2 .MXFJ-400 repairs reverse osmosis membrane front and back ultraviolet spectrogram
Add Fe among Fig. 3 .MXFJ-400
3+Back ultraviolet spectrogram
Add Al among Fig. 4 .MXFJ-400
3+Back ultraviolet spectrogram
Add Ca among Fig. 5 .PMXFJ-400
2+Back ultraviolet spectrogram
Add Zn among Fig. 6 .MXFJ-400
2+Back ultraviolet spectrogram
The waste and old reverse osmosis membrane of Fig. 7 cleans, the structure chart of prosthetic appliance
Among the figure: filter core exhaust-valve V0, water valve V1 from the beginning, running water inlet valve V2, running water outlet valve V3, acid lotion water intaking valve V4, basic lotion water intaking valve V5, renovation agent water intaking valve V6, total water intaking valve V7, old film water intaking valve V8, the dense water out valve of old film V9, old film short valve V10, system pure water-Xin film water intaking valve V11, old film water outlet valve V12, new film water intaking valve V13, the new dense water out valve of film V14, new film short valve V15, fresh water drain valve V16, concentrated water discharge valve V17, renovation agent concentrate recirculation valve V18, renovation agent fresh water return valve V19, alkali cleaning concentrate recirculation valve V20, alkali cleaning fresh water return valve V21, pickling fresh water return valve V22, pickling concentrate recirculation valve V23, dense water check (non-return) valve V24, V25, V26, V27, discharging of waste liquid valve V28, old film flow of inlet water meter F1, new film flow of inlet water meter F2, old film fresh-water flow meter F3, new film fresh-water flow meter F4, old film water inlet conductivity meter E1, new film water inlet conductivity meter E2, old film fresh water conductivity meter E3, water inlet instrument pH, force (forcing) pump P, water inlet gross pressure table P1, new film inlet gage P2, new film delivery gauge P3, accurate filter PP1 and PP2, city water tank 1, acid cleaning tank 2, alkali cleaning case 3, renovation agent case 4.
The specific embodiment
Following embodiment all can realize the effect of above-mentioned experimental example.
Embodiment 1:
The model that Nitto Denko Corp is produced is that No. 25 waste and old reverse osmosis membranes of CPA3-8080 carry out the constituent analysis of film dirt, step is: the trapped substance sample of at first gathering waste and old reverse osmosis membrane surface, use chemical analysis, ESEM (SEM), x diffractometer to identify the trapped substance sample respectively, film dirt crystal structure pattern such as Fig. 1.The dirty class that forms in the waste and old reverse osmosis membrane is characterized and analyzes, confirm that pollution type is silicate and/or carbonate; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical methodes, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, white residue is silicon, dauk, calcium dirt; The crystalline lens profile is inorganic colloid, calcium dirt; The film dirt constituent analysis result who finally draws waste and old reverse osmosis membrane is SiO for film dirt main component
2, also contain illite, micarex and clinochlore, mainly constitute by Si, K, Ca, Mg, Al element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in the Figure of description 7, use is carried out at the cleaning agent of the present invention and the renovation agent of different film dirts, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are:
The desalination rate=(Ei-Eo)/Ei
The water rate of recovery=Vo/Vi
Pressure reduction=Pi-Po,
Wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, and measuring pressure is 1.5MPa, and measuring temperature is normal temperature for the running water water temperature.
The various parameters such as the table 1 that measure.The initial pressure reduction of this film is 1.25MPa before cleaning, and film is blocked, can't measure its initial desalination performance.At first carry out back flush, the stream of film is by open-minded.Subsequently, use a pair of its of prescription to clean, its pressure reduction drops to 0.17MPa gradually, and the desalination rate and the water rate of recovery are respectively 71.9% and 11.4%.After again to its three cleanings of filling a prescription, mainly for the organic matter of removing the film surface, colloid, and SiO2 etc.Clean back desalination rate and drop to 69.9%, the water rate of recovery rises to 19.2%, and pressure reduction drops to 0.15MPa.Through repeatedly filling a prescription one, after prescription three cleans repeatedly, using renovation agent that it is carried out chemistry reparation at last, making the desalination rate is 86.9%, and the water rate of recovery is 13.8%, and pressure reduction is 0.15MPa.
Table 1.25 film cleaning reagent and parameter
The assay method of the cleaning criterion of acceptability of waste and old reverse osmosis membrane is
(1) in cleaning repair process, at medium is the running water of electrical conductivity at 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is under the normal temperature condition for the running water water temperature, measure the various performance parameters of new reverse osmosis membrane and waste and old reverse osmosis membrane respectively, the desalination rate is 99.5%, fresh water electrical conductivity 2.51 μ s cm
-1, the water rate of recovery 17.9%, permeable amount are 40.3M
3d
-1, pressure reduction is 0.07MPa.
(2) parameters that measures is compared, difference mainly contains: 1. pressure reduction raises, and the pressure reduction of new reverse osmosis membrane is about 0.1MPa, and the initial pressure reduction of waste and old reverse osmosis membrane is all far above 0.2MPa; 2. the water rate of recovery descends, and the water rate of recovery of new reverse osmosis membrane is about about 15%, and the water rate of recovery of waste and old reverse osmosis membrane is worth far below this; 3. the desalination rate descends.New film desalination rate is generally greater than 99%, and the desalination rate of waste and old reverse osmosis membrane descends a lot.
(3) clean respectively at various dirty class, under same test condition, carry out the measurement of parameters.
The performance of waste and old reverse osmosis membrane after (4) contrast is cleaned and new reverse osmosis membrane, and each parameter demarcated, suitable up to the performance that reaches both, the criterion of acceptability of having established waste and old reverse osmosis membrane cleaning is: the desalination rate reaches more than 85.0%, the water rate of recovery reaches more than 12%, and pressure reduction is lower than 0.2MPa.
The parameters that records after the above-mentioned cleaning reparation has all reached the cleaning criterion of acceptability, and the basic and new film of this waste and old reverse osmosis membrane performance is approaching.
Embodiment 2:
The model that Dow Chemical is produced is that No. 5 waste and old reverse osmosis membranes of BW30-400 carry out the constituent analysis of film dirt according to method and the step of embodiment 1, confirms that at first pollution type is silicate and/or carbonate; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical analysis methods, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, white residue is silicon, dauk, calcium dirt; The crystalline lens profile is the calcium dirt; , the film dirt constituent analysis result who finally draws waste and old reverse osmosis membrane is SiO for film dirt main component
2, also contain illite, micarex and clinochlore, mainly constitute by Si, K, Ca, Mg, Al element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in the Figure of description 7, use is carried out at the cleaning agent of the present invention and the renovation agent of different film dirts, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are:
The desalination rate=(Ei-Eo)/Ei
The water rate of recovery=Vo/Vi
Pressure reduction=Pi-Po,
Wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, and measuring pressure is 1.5MPa, and measuring 1 temperature is normal temperature for the running water water temperature.
The various parameters such as the table 2 that record.The initial desalination rate of this film is 96.6%, and the fresh water electrical conductivity is 17.6%, and pressure reduction is 0.20MPa.Through prescription one, three clean repeatedly and the repair process of renovation agent chemistry after, the desalination rate of film is 98.7%, has risen 2.1%; The water rate of recovery is 14.4%, pressure reduction is the 0.12MPa 0.08MPa that descended, determine the cleaning criterion of acceptability of waste and old reverse osmosis membrane according to the method for embodiment 1, both parameters are compared discovery, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached the cleaning criterion of acceptability, and this old reverse osmosis membrane is basic near the performance of new film.
Table 2.5 film cleaning reagent and parameter
Embodiment 3:
The model that Nitto Denko Corp is produced is that No. 6 waste and old reverse osmosis membranes of CPA3-8080 carry out the constituent analysis of film dirt according to method and the step of embodiment 1, and the affirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical analysis methods, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, the brown residue is the iron dirt; White residue is silicon, dauk, calcium dirt; The crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant is thick judgement, also contains biofouling or organic dirt, and the film dirt constituent analysis result who finally draws waste and old reverse osmosis membrane is SiO for film dirt main component
2, also contain illite, micarex and clinochlore, mainly constitute by Si, K, Ca, Mg, Fe, Al, C element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in the Figure of description 7, use is carried out at the cleaning agent of the present invention and the renovation agent of different film dirts, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are:
The desalination rate=(Ei-Eo)/Ei
The water rate of recovery=Vo/Vi
Pressure reduction=Pi-Po,
Wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, and measuring pressure is 1.5MPa, and measuring temperature is normal temperature for the running water water temperature.
The various parameters such as the table 3 that record.The initial desalination rate of this film film is 97.5%, and the water rate of recovery is 12.0%, and pressure reduction is 0.30MPa; It is characterized in that pressure reduction is big.From the initial desalination performance of film as can be seen, the film water rate of recovery is on the low side, and pressure reduction is higher.Through desalination rate after cleaning is 98.8%, the water rate of recovery is 18.6%, risen 6.6%, pressure reduction is 0.19MPa, the 0.11MPa that descended determines the cleaning criterion of acceptability of waste and old reverse osmosis membrane both parameters to be compared discovery according to the method for embodiment 1, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached the cleaning criterion of acceptability, and this old reverse osmosis membrane is basic near the performance of new film.
Table 3.6 film cleaning reagent and parameter
Embodiment 4:
The model that Nitto Denko Corp is produced is that No. 267 waste and old reverse osmosis membranes of CPA3-8080 carry out the constituent analysis of film dirt according to method and the step of embodiment 1, confirms that pollution type is silicate and/or ferriferous oxide; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical analysis methods, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, the brown residue is the iron dirt; White residue is silicon, dauk, calcium dirt; The crystalline lens profile is inorganic colloid, calcium dirt; The film dirt constituent analysis result who finally draws waste and old reverse osmosis membrane is SiO for film dirt main component
2, also contain illite, micarex and clinochlore, mainly constitute by Si, Ca, Mg, Fe, C element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in the Figure of description 7, use is carried out at the cleaning agent of the present invention and the renovation agent of different film dirts, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are:
The desalination rate=(Ei-Eo)/Ei
The water rate of recovery=Vo/Vi
Pressure reduction=Pi-Po,
Wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, and measuring pressure is 1.5MPa, and measuring temperature is normal temperature for the running water water temperature.
The various parameters such as the table 4 that record.The initial desalination rate of this film film is 89.9%, and the water rate of recovery is 20.4%, and pressure reduction is 0.22MPa.Through cleaning treatment, its desalination rate rises to 94.4%, risen 4.5%, pressure reduction drops to 0.16MPa, the 0.06MPa that descended determines the cleaning criterion of acceptability of waste and old reverse osmosis membrane both parameters to be compared discovery according to the method for embodiment 1, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached the cleaning criterion of acceptability, and this old reverse osmosis membrane is basic near the performance of new film.
Table 4.267 film cleaning reagent and parameter
Embodiment 5:
The model that Nitto Denko Corp is produced is that No. 47 waste and old reverse osmosis membranes of CPA3-8080 carry out the constituent analysis of film dirt according to method and the step of embodiment 1, confirms that pollution type is silicate and/or ferriferous oxide; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical analysis methods, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, the brown residue is the iron dirt; From the form of smell and pollutant is thick judgement, also contains biofouling or organic dirt, and the film dirt constituent analysis result who finally draws waste and old reverse osmosis membrane is SiO for film dirt main component
2, also contain illite, micarex and clinochlore, mainly constitute by Si, K, Ca, Mg, Fe, Al, C element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in the Figure of description 7, use is carried out at the cleaning agent of the present invention and the renovation agent of different film dirts, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are:
The desalination rate=(Ei-Eo)/Ei
The water rate of recovery=Vo/Vi
Pressure reduction=Pi-Po,
Wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, and measuring pressure is 1.5MPa, and measuring temperature is normal temperature for the running water water temperature.
The various parameters such as the table 5 that record.The initial pressure reduction of this film is 1.26MPa before cleaning, and film is blocked, can't measure its initial desalination performance.At first carry out back flush, the stream of film is by open-minded.Subsequently, use a pair of its of prescription to clean, its pressure reduction drops to 0.16MPa gradually, and the desalination rate and the water rate of recovery are respectively 70.9% and 11.8%.After again to its three cleanings of filling a prescription, mainly for the organic matter of removing the film surface, colloid, and SiO2 etc.Clean back desalination rate and drop to 69.4%, the water rate of recovery rises to 19.7%, and pressure reduction drops to 0.15MPa.Through repeatedly fill a prescription two, after the cleaning repeatedly of prescription four, use renovation agent that it is carried out chemistry reparation at last, making the desalination rate is 87.2%, the water rate of recovery is 13.9%, pressure reduction is 0.15MPa, determines the cleaning criterion of acceptability of waste and old reverse osmosis membrane both parameters to be compared discovery according to the method for embodiment 1, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached the cleaning criterion of acceptability, and this old reverse osmosis membrane is basic near the performance of new film.
Table 5.47 film cleaning reagent and parameter change
Embodiment 6:
The model that Nitto Denko Corp is produced is that No. 56 waste and old reverse osmosis membranes of CPA3-8080 carry out the constituent analysis of film dirt according to the method and the step of experimental example 1, confirms that pollution type is silicate and/or carbonate; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical analysis methods, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, from the form of smell and pollutant is thick judgement, contain biofouling or organic dirt in the waste and old reverse osmosis membrane dirt, the film dirt constituent analysis result who finally draws waste and old reverse osmosis membrane is SiO for film dirt main component
2, also contain organic matter, mainly constitute by Si, K, Ca, Al, C element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in the Figure of description 7, use is carried out at the cleaning agent of the present invention and the renovation agent of different film dirts, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are:
The desalination rate=(Ei-Eo)/Ei
The water rate of recovery=Vo/Vi
Pressure reduction=Pi-Po,
Wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, and measuring pressure is 1.5MPa, and measuring temperature is normal temperature for the running water water temperature.
The various parameters such as the table 6 that record.The initial pressure reduction of this film is 1.25MPa before cleaning, and film is blocked, can't measure its initial desalination performance.At first carry out back flush, the stream of film is by open-minded.Subsequently, use a pair of its of prescription to clean, its pressure reduction drops to 0.17MPa gradually, and the desalination rate and the water rate of recovery are respectively 72.9% and 11.8%.After again to its two cleanings of filling a prescription, mainly for the organic matter of removing the film surface, colloid, and SiO2 etc.Clean back desalination rate and drop to 69.8%, the water rate of recovery rises to 19.2%, and pressure reduction drops to 0.15MPa.Through repeatedly fill a prescription four, after prescription five cleans repeatedly, use renovation agent that it is carried out chemistry reparation at last, making the desalination rate is 87.2%, the water rate of recovery is 14.6%, pressure reduction is 0.15MPa, determines the cleaning criterion of acceptability of waste and old reverse osmosis membrane both parameters to be compared discovery according to the method for embodiment 1, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached the cleaning criterion of acceptability, and this old reverse osmosis membrane is basic near the performance of new film.
Table 6.56 film cleaning reagent and parameter change
Embodiment 7:
The model that Nitto Denko Corp is produced is that No. 38 waste and old reverse osmosis membranes of CPA3-8080 carry out the constituent analysis of film dirt according to the method and the step of experimental example 1, and the affirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical analysis methods, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge the dirt classification, white residue is silicon, dauk, calcium dirt; The crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant is thick judgement, also contains biofouling or organic dirt, and the film dirt constituent analysis result who finally draws waste and old reverse osmosis membrane is SiO for film dirt main component
2, also contain illite, micarex and clinochlore, mainly constitute by Si, K, Ca, Mg, Al, C element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in the Figure of description 7, use is carried out at the cleaning agent of the present invention and the renovation agent of different film dirts, under flow rate of liquid 〉=10 meter per second conditions, carry out high speed and clean, under pressure 〉=1.5Mpa condition, repair;
(3) be determined at the relevant parameter of film properties in Chemical cleaning, the chemical repair process, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are:
The desalination rate=(Ei-Eo)/Ei
The water rate of recovery=Vo/Vi
Pressure reduction=Pi-Po,
Wherein, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
Condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, and measuring pressure is 1.5MPa, and measuring temperature is normal temperature for the running water water temperature.
The various parameters such as the table 7 that record.The initial pressure reduction of this film is 1.25MPa before cleaning, and film is blocked, can't measure its initial desalination performance.At first carry out back flush, the stream of film is by open-minded.Subsequently, use a pair of its of prescription to clean, its pressure reduction drops to 0.17MPa gradually, and the desalination rate and the water rate of recovery are respectively 72.1% and 11.8%.After again to its three cleanings of filling a prescription, mainly for the organic matter of removing the film surface, colloid, and SiO2 etc.Clean back desalination rate and drop to 69.7%, the water rate of recovery rises to 19.4%, and pressure reduction drops to 0.15MPa.Through repeatedly fill a prescription four, after prescription two cleans repeatedly, use renovation agent that it is carried out chemistry reparation at last, making the desalination rate is 87.8%, the water rate of recovery is 14.2%, pressure reduction is 0.15MPa, determines the cleaning criterion of acceptability of waste and old reverse osmosis membrane both parameters to be compared discovery according to the method for embodiment 1, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached the cleaning criterion of acceptability, and this old reverse osmosis membrane is basic near the performance of new film.
No. 38 film cleaning reagents of table 7 and parameter change
Claims (13)
1. reagent that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes cleans, repairs, it is characterized in that for inorganic salt crust class, the reagent that waste and old reverse osmosis membrane off-line type cleans is 0.1-0.5%HCl solution, cleaning condition is: pH value 1-4, temperature＜38 ℃; For metal oxide dirt class, the reagent that waste and old reverse osmosis membrane off-line type cleans is 0.6-1.2%Na
2S
2O
4Solution, cleaning condition is: temperature＜35 ℃; For the dirty class that is insoluble to acid, the reagent that waste and old reverse osmosis membrane off-line type cleans is 0.08-0.14%NaOH solution and 0.8-1.3%Na
4The mixed solution of EDTA solution, mixed proportion is: 1: 1, cleaning condition was: pH value 11-12, temperature＜30 ℃; For inorganic colloid dirt class, silicon dirt or microorganism dirt class, the reagent that waste and old reverse osmosis membrane off-line type cleans is the mixed solution of 0.08-0.14%NaOH solution and 0.020-0.029% dodecyl sodium sulfate (Na-SDS), mixed proportion is: 1: 1, cleaning condition is: pH value 11-12, temperature＜30 ℃; For organic matter dirt class, the reagent that waste and old reverse osmosis membrane off-line type cleans is the mixed solution of 0.08-0.14%NaOH solution and 0.020-0.029%Na-SDS solution, mixed proportion: 1: 1, cleaning condition is: pH value 11-12, temperature＜30 ℃, use the 0.2%HCl acidic cleaning solution after the alkali cleaning, cleaning condition is: pH value 1-2, temperature＜38 ℃; Waste and old reverse osmosis membrane off-line type is repaired reagent: the U.S. wins the pore former MXFJ-400 that Da Yake skill Co., Ltd produces, and lot number is: FJ-090708D.
2. the reagent that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 1 cleans, repairs is characterized in that described inorganic salt crust class is the calcium dirt.
3. the reagent that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 1 cleans, repairs is characterized in that, described metal oxide dirt class is that iron is or/and the aluminium dirt.
4. the reagent that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 1 cleans, repairs is characterized in that, described inorganic colloid dirt class is a mud.
5. the reagent that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 1 cleans, repairs is characterized in that the described dirty class that is insoluble to acid is CaF
2, BaSO
4, SrSO
4Or CaSO
4
6. the reagent that cleans, repairs according to the described off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes of one of claim 1-5 is characterized in that, described reparation reagent MXFJ-400 adds Zn when repairing during obtain solution carrying out reverse osmosis membrane
2+
7. an application rights requires the method that the described off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes of one of 1-5 cleans, the reagent of reparation carries out the off-line type cleaning, repairs, and it is characterized in that comprising the steps:
(1) to the dirty constituent analysis of the film of waste and old reverse osmosis membrane, step is: the trapped substance sample of at first gathering waste and old reverse osmosis membrane surface, use chemical analysis, scanning electron microscope analysis, X diffractometer Analysis and Identification trapped substance sample respectively, the dirty class that forms in the waste and old reverse osmosis membrane is characterized and analyzes, and the affirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly to the film dirt of different pollution types analysis and the mensuration through three kinds of chemical methodes, the film dirt that draws waste and old reverse osmosis membrane becomes to be grouped into; At last in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judge that dirt is categorized as: the brown residue is the iron dirt; White residue is silicon, dauk, calcium dirt; The crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant is thick judgement, also contains biofouling or organic dirt; Finally draw the film dirt constituent analysis result of waste and old reverse osmosis membrane: film dirt main component is SiO
2, also contain illite, micarex and clinochlore, mainly constitute by Si, K, Ca, Mg, Fe, Al element;
(2) according to the dirty constituent analysis result of the film of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, prosthetic appliance, use requires cleaning agent and renovation agent among the 1-5 to carry out the high speed cleaning under flow rate of liquid 〉=10 meter per second conditions at the application rights of different film dirts, repairs under pressure 〉=1.5Mpa condition;
(3) in Chemical cleaning, chemical repair process, the relevant parameter of METHOD FOR CONTINUOUS DETERMINATION film properties, condition determination is: medium is the running water of electrical conductivity at 450-550 μ s/cm, measuring pressure is 1.5MPa, measuring temperature is normal temperature for the running water water temperature, cleans and repairs to reaching criterion of acceptability.
8. the method that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 6 cleans, repairs is characterized in that described waste and old reverse osmosis membrane cleans, prosthetic appliance is the structure formation and annexation is as follows:
This equipment is mainly by valve, flowmeter, conductivity meter, Pressure gauge and water inlet instrument pH, force (forcing) pump P and accurate filter PP1 and PP2 form, and described valve is by filter core exhaust-valve V0, water valve V1 from the beginning, running water inlet valve V2, running water outlet valve V3, acid lotion water intaking valve V4, basic lotion water intaking valve V5, renovation agent water intaking valve V6, total water intaking valve V7, old film water intaking valve V8, the dense water out valve of old film V9, old film short valve V10, system pure water-Xin film water intaking valve V11, old film water outlet valve V12, new film water intaking valve V13, the new dense water out valve of film V14, new film short valve V15, fresh water drain valve V16, concentrated water discharge valve V17, renovation agent concentrate recirculation valve V18, renovation agent fresh water return valve V19, alkali cleaning concentrate recirculation valve V20, alkali cleaning fresh water return valve V21, pickling fresh water return valve V22, pickling concentrate recirculation valve V23, dense water check (non-return) valve V24, V25, V26, V27, discharging of waste liquid valve V28 forms; Described flowmeter is made up of old film flow of inlet water meter F1, new film flow of inlet water meter F2, old film fresh-water flow meter F3 and new film fresh-water flow meter F4; Described conductivity meter is made up of old film water inlet conductivity meter E1, new film water inlet conductivity meter E2 and old film fresh water conductivity meter E3; Described Pressure gauge is made up of water inlet gross pressure table P1, new film inlet gage P2 and new film delivery gauge P3;
Accurate filter PP1 inlet passes through from the beginning, and water valve V1 is connected with the municipal tap water pipe, outlet is connected with city water tank 1 import by running water inlet valve V2, city water tank 1, acid cleaning tank 2, alkali cleaning case 3,4 outlets of renovation agent case are respectively by running water outlet valve V3, acid lotion water intaking valve V4, basic lotion water intaking valve V5, renovation agent water intaking valve V6 links to each other with force (forcing) pump 5 water inlets, the old film water inlet of middle serial connection conductivity meter E1, water inlet instrument pH, the outlet of force (forcing) pump 5 is by total water intaking valve V7, old film water intaking valve V8, old film flow of inlet water meter F1 links to each other with waste and old reverse osmosis membrane 6 imports, simultaneously by old film short valve V10, new film flow of inlet water meter F2, new film water intaking valve V13 links to each other with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2, waste and old reverse osmosis membrane 6 dense water outs are by the dense water out valve of old film V9, new film flow of inlet water meter F2, new film water intaking valve V13 links to each other with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2, link to each other with PP2 accurate filter inlet by new film short valve V15 simultaneously, waste and old reverse osmosis membrane water outlet is by old film water outlet valve V12, old film fresh-water flow meter F3, renovation agent fresh water return valve V19, alkali cleaning fresh water return valve V21, pickling fresh water return valve V22 respectively with renovation agent case 4, alkali cleaning case 3, acid cleaning tank 2 imports link to each other, the old film fresh water conductivity meter E3 of middle serial connection, end meets fresh water drain valve V16, link to each other with new film 7 imports by system pure water-Xin film water intaking valve V11 simultaneously, new reverse osmosis membrane 7 dense water outs are by the dense water out valve of new film V14, dense water check (non-return) valve V24 links to each other with accurate filter PP2 inlet, the new film delivery gauge P3 of middle serial connection, new reverse osmosis membrane 7 water outlets are by new film fresh-water flow meter F4, renovation agent dilute side return valve V19, alkali cleaning fresh water return valve V21, pickling fresh water return valve V22 respectively with renovation agent case 4, alkali cleaning case 3, acid cleaning tank 2 imports link to each other, end meets fresh water drain valve V16, the outlet of PP2 accurate filter is by renovation agent concentrate recirculation valve V18, alkali cleaning concentrate recirculation valve V20, pickling concentrate recirculation valve V23 respectively with renovation agent case 4, alkali cleaning case 3, acid cleaning tank 2 imports link to each other, and end meets concentrated water discharge valve V17.
9. the method that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 6 cleans, repairs, it is characterized in that, described film properties relevant parameter, comprise the desalination rate, the water rate of recovery, pressure reduction, computational methods are desalination rate=(the Ei-Eo)/Ei water rate of recovery=Vo/Vi pressure reduction=Pi-Po,, the water inlet electrical conductivity of Ei-reverse osmosis membrane; The fresh water electrical conductivity of Eo-reverse osmosis membrane; The fresh-water flow of Vo-reverse osmosis membrane; The flow of inlet water of Vi-reverse osmosis membrane; The water inlet inlet pressure of Pi-reverse osmosis membrane; The dense water out pressure of Po-reverse osmosis membrane.
10. the method that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 6 cleans, repairs, it is characterized in that, described criterion of acceptability reaches more than 85.0% for referring to the desalination rate, and the water rate of recovery reaches more than 12%, and pressure reduction is lower than 0.2MPa.
11. the method that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 6 cleans, repairs is characterized in that definite method of described criterion of acceptability is:
(1) in cleaning repair process, be the running water of electrical conductivity at 450-550 μ s/cm at medium, measuring pressure is 1.5MPa, and measuring temperature is under the normal temperature condition for the running water water temperature, measures the various performance parameters of new reverse osmosis membrane and waste and old reverse osmosis membrane respectively;
(2) parameters that measures is compared, difference mainly contains: 1. pressure reduction raises, and the pressure reduction of new reverse osmosis membrane is 0.1MPa, and the initial pressure reduction of waste and old reverse osmosis membrane is all far above 0.2MPa; 2. the water rate of recovery descends, and the water rate of recovery of new reverse osmosis membrane is 15%, and the water rate of recovery of waste and old reverse osmosis membrane is 10%; 3. the desalination rate descends; New film desalination rate is generally greater than 99%, and the desalination rate of waste and old reverse osmosis membrane descends a lot, generally is lower than 80%;
(3) clean respectively at various dirty class, under same test condition, carry out the measurement of parameters;
The performance of the waste and old reverse osmosis membrane after (4) contrast is cleaned and new reverse osmosis membrane, and each parameter demarcated, suitable up to the performance that reaches both, established the criterion of acceptability that waste and old reverse osmosis membrane cleans reparation.
12. the method that the off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes according to claim 6 cleans, repairs is characterized in that, removes Fe earlier before the described waste and old reverse osmosis membrane reparation
3+And Al
3+
13. the method that one of according to Claim 8-11 described off-line type that carries out at the film dirt of different waste and old reverse osmosis membranes cleans, repairs is characterized in that, removes Fe earlier before the described waste and old reverse osmosis membrane reparation
3+And Al
3+
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110060405.0A CN102210978B (en) | 2011-03-14 | 2011-03-14 | Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode |
| PCT/CN2012/071724 WO2012122892A1 (en) | 2011-03-14 | 2012-02-28 | Off-line cleaning and repairing method for different fouling of waste reverse osmosis membrane |
| PCT/CN2012/071702 WO2012122890A2 (en) | 2011-03-14 | 2012-02-28 | Reagent for off-line cleaning and repairing specifically aimed at different types of membrane fouling of waste and old reverse osmosis membranes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110060405.0A CN102210978B (en) | 2011-03-14 | 2011-03-14 | Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode |
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| Publication Number | Publication Date |
|---|---|
| CN102210978A true CN102210978A (en) | 2011-10-12 |
| CN102210978B CN102210978B (en) | 2014-03-05 |
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ID=44742652
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|---|---|---|---|
| CN201110060405.0A Active CN102210978B (en) | 2011-03-14 | 2011-03-14 | Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode |
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| Country | Link |
|---|---|
| CN (1) | CN102210978B (en) |
| WO (2) | WO2012122892A1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122892A1 (en) * | 2011-03-14 | 2012-09-20 | 四川科伦药业股份有限公司 | Off-line cleaning and repairing method for different fouling of waste reverse osmosis membrane |
| WO2012122883A1 (en) * | 2011-03-14 | 2012-09-20 | 四川科伦药业股份有限公司 | Multifunctional off-line washing and repairing device for waste reverse osmosis membrane |
| EP2745917A1 (en) * | 2012-12-18 | 2014-06-25 | Grundfos Holding A/S | A liquid fluid filter assembly |
| CN108217841A (en) * | 2017-12-04 | 2018-06-29 | 山东聊城鲁西硝基复肥有限公司 | A kind of reverse osmosis water treatment system method for cleaning |
| CN108502982A (en) * | 2018-04-25 | 2018-09-07 | 天津碧水源膜材料有限公司 | A kind of renovation agent of the reverse-osmosis membrane element to desalinize seawater |
| CN109966921A (en) * | 2019-04-26 | 2019-07-05 | 北京亦庄水务有限公司 | A kind of minimizing technology of counter-infiltration system pollutant |
| CN110520209A (en) * | 2017-03-14 | 2019-11-29 | 海水淡化科技有限公司 | Antifouling reverse osmosis and film cleaning systems are integrated for pre- |
| CN111229048A (en) * | 2020-01-16 | 2020-06-05 | 西藏华阳供热工程服务有限公司 | Chemical cleaning agent for reverse osmosis device and cleaning method thereof |
| CN111389233A (en) * | 2020-03-20 | 2020-07-10 | 北京碧水源膜科技有限公司 | Preparation method of microfiltration membrane repairing liquid for functional layer damage and microfiltration membrane repairing method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122892A1 (en) * | 2011-03-14 | 2012-09-20 | 四川科伦药业股份有限公司 | Off-line cleaning and repairing method for different fouling of waste reverse osmosis membrane |
| WO2012122883A1 (en) * | 2011-03-14 | 2012-09-20 | 四川科伦药业股份有限公司 | Multifunctional off-line washing and repairing device for waste reverse osmosis membrane |
| EP2745917A1 (en) * | 2012-12-18 | 2014-06-25 | Grundfos Holding A/S | A liquid fluid filter assembly |
| WO2014095303A1 (en) * | 2012-12-18 | 2014-06-26 | Grundfos Holding A/S | A liquid fluid filter assembly |
| CN110520209A (en) * | 2017-03-14 | 2019-11-29 | 海水淡化科技有限公司 | Antifouling reverse osmosis and film cleaning systems are integrated for pre- |
| CN108217841A (en) * | 2017-12-04 | 2018-06-29 | 山东聊城鲁西硝基复肥有限公司 | A kind of reverse osmosis water treatment system method for cleaning |
| CN108502982A (en) * | 2018-04-25 | 2018-09-07 | 天津碧水源膜材料有限公司 | A kind of renovation agent of the reverse-osmosis membrane element to desalinize seawater |
| CN109966921A (en) * | 2019-04-26 | 2019-07-05 | 北京亦庄水务有限公司 | A kind of minimizing technology of counter-infiltration system pollutant |
| CN111229048A (en) * | 2020-01-16 | 2020-06-05 | 西藏华阳供热工程服务有限公司 | Chemical cleaning agent for reverse osmosis device and cleaning method thereof |
| CN111389233A (en) * | 2020-03-20 | 2020-07-10 | 北京碧水源膜科技有限公司 | Preparation method of microfiltration membrane repairing liquid for functional layer damage and microfiltration membrane repairing method |
| CN111389233B (en) * | 2020-03-20 | 2022-07-01 | 北京碧水源膜科技有限公司 | Preparation method of microfiltration membrane repairing liquid for functional layer damage and microfiltration membrane repairing method |
| CN114249509A (en) * | 2022-02-28 | 2022-03-29 | 利津绿瑞环保科技有限公司 | Chemical cleaning and sewage treatment process for reverse osmosis membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012122890A2 (en) | 2012-09-20 |
| WO2012122892A1 (en) | 2012-09-20 |
| CN102210978B (en) | 2014-03-05 |
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