CN102210978B - 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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- CN102210978B CN102210978B CN201110060405.0A CN201110060405A CN102210978B CN 102210978 B CN102210978 B CN 102210978B CN 201110060405 A CN201110060405 A CN 201110060405A CN 102210978 B CN102210978 B CN 102210978B
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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
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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, particularly cleaning, restorative procedure and the reagent of waste and old reverse osmosis membrane under off-line state.
Background technology
Purified water preparation in every field (food, pharmacy, electric power, running water etc.) at present has all adopted reverse osmosis technology, the core that reverse osmosis membrane is counter-infiltration system, the whether good performance that directly affects counter-infiltration system of its service behaviour.
Counter-infiltration system is after operation a period of time, film surface can generate indissoluble bacterium layer, metal dirt, silicon is dirty and other organic and inorganic pollutant, cause the increase of counter-infiltration system inlet pressure, aquifer yield to reduce, produce water conductivity and rise, impact product water water quality, reverse osmosis membrane consumes high.
According to current technology, to the online simple cleaning technique of the most of employing of waste and old reverse osmosis membrane, and this kind of mode can cause an obstruction just must carry out Chemical cleaning to all films (comprising still normal film) for many films in many film pipes, the not bad film of function is produced to unnecessary chemical damage, prior art is not carried out specialty analysis to different fouling situations and water quality, for different dirty classes, do not carry out professional chemical analysis yet, provide proprietary formula, this will cause a kind of comparatively rough film cleaning way, and after cleaning, effect is difficult to guarantee.
On to the basis of waste and old reverse osmosis membrane and the analysis of film dirt, find, the desalination hydraulic performance decline of reverse osmosis membrane is more serious, and reverse osmosis membrane may have perforation phenomenon, and chemical reparation has been carried out in reverse osmosis membrane surface, to reach the requirement that increases substantially film desalination performance.Currently available technology does not relate to the restorative procedure that damages film, and research is herein still blank.
Summary of the invention
The object of the invention has been to disclose a kind of waste and old reverse osmosis membrane off-line type targetedly that carries out drawing after specialty analysis for 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:
Formula 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 1-4,38 ℃ of temperature <; Wherein, described inorganic salt crust class is preferably calcium dirt.
Formula 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: 35 ℃ of temperature <; Wherein, described metal oxide dirt class is preferably iron or/and aluminium is dirty.
Formula three, for being insoluble to sour dirty class, 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 11-12,30 ℃ of temperature <; Wherein, the described sour dirty class that is insoluble to is preferably CaF
2, BaSO
4, SrSO
4or CaSO
4.
Formula 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 11-12,30 ℃ of temperature <; Wherein, described inorganic colloid dirt class is preferably mud.
Formula 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 11-12,30 ℃ of temperature <, after alkali cleaning, use 0.1-0.5%HCl acidic cleaning solution, cleaning condition is: pH value 1-2,38 ℃ of temperature <.
The waste and old reverse osmosis membrane off-line type of the present invention is repaired reagent: the pore former MXFJ-400 that U.S. Sheng Daya Science and Technology Ltd. produces, 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) the film dirt constituent analysis to waste and old reverse osmosis membrane, step is: the trapped substance sample that first gathers waste and old reverse osmosis membrane surface, use respectively chemical analysis, ESEM (SEM) analysis, X diffractometer identification and analysis trapped substance sample, the dirty class forming in waste and old reverse osmosis membrane is characterized and analyzed, and confirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly analysis and the mensuration through three kinds of chemical methodes to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, finally draws the film dirt constituent analysis result of waste and old reverse osmosis membrane;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, prosthetic appliance (seeing Fig. 7), use is for the waste and old reverse osmosis membrane cleaning agent of the present invention and the renovation agent of above-mentioned different film dirt, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, condition determination is: medium is that electrical conductivity is at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is normal temperature, clean and repair to reaching criterion of acceptability: 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 SDI instrument, judgement dirt is categorized as: brown residue is iron dirt; White residue is silicon, dauk, calcium dirt; Crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant, be thick judgement, also contain biofouling or organic dirt.
Wherein, described film properties relevant parameter, comprises 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, medium be electrical conductivity at the running water of 450-550 μ s/cm, mensurations pressure is 1.5MPa, mensuration temperature is that running water water temperature is under normal temperature condition, measures respectively the various performance parameters of new reverse osmosis membrane and waste and old reverse osmosis membrane;
(2) parameters measuring 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 declines, 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. desalination rate declines; New film desalination rate is generally greater than 99%, and the desalination rate of waste and old reverse osmosis membrane declines a lot, generally lower than 80%;
(3) for various dirty class, clean respectively, under same test condition, carry out the measurement of parameters;
(4) performance of the waste and old reverse osmosis membrane of contrast after cleaning and new reverse osmosis membrane, and parameters is demarcated, until it is suitable to reach both performances, established the waste and old reverse osmosis membrane of the present invention and cleaned the criterion of acceptability of repairing: desalination rate has reached 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 shown in 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, described valve is by filter core exhaust-valve V0, running water valve V1, 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, pure water-Xin film water intaking valve V11 processed, 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 comprised 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 comprised 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 comprised of the gross pressure table P1 of intaking, new film inlet gage P2 and new film delivery gauge P3,
Accurate filter PP1 entrance is connected with municipal tap water pipe by running water valve V1, and 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 is connected 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 is connected 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 is connected with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2, the dense water out of waste and old RO film 6 is by the dense water out valve of old film V9, new film flow of inlet water meter F2, new film water intaking valve V13 is connected with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2 is connected with PP2 accurate filter entrance by new film short valve V15 simultaneously, and 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 are connected, the old film fresh water conductivity meter E3 of middle serial connection, and end meets fresh water drain valve V16, is connected by pure water-Xin film water intaking valve V11 processed with new film 7 imports simultaneously, and the new dense water out of RO film 7 is by the dense water out valve of new film V14, dense water check (non-return) valve V24 is connected with accurate filter PP2 entrance, the new film delivery gauge P3 of middle serial connection, and 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 are connected, and end meets fresh water drain valve V16, and 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 are connected, 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 to reparation targetedly, solved the halfway problem of cleaning that former rough formula cleaning way causes, and researched and developed in a creative way reparation reagent and the method for damaging film, filled up domestic blank in this regard.The parameters that the film obtaining is repaired in the method and reagent cleaning more approaches new film, and film repair rate strengthens greatly, and specific aim is higher, has avoided the drawback to intact membrance chemistry damage in existing cleaning method simultaneously.Off-line of the present invention cleans method and the reagent of repairing waste and old reverse osmosis membrane, can guarantee that performance after film cleans reaches or approaches new film, greatly reduce enterprise's film consuming cost, guaranteed that production and film cleaning are independent of each other, and have stopped the damage of online Chemical cleaning to normal film.
Experimental example and embodiment are used for further illustrating but are not limited to the present invention below
Experimental example
Experimental example 1 impact of each metal ion species on the performance of renovation agent MXFJ-400
(1) to repair the solution of waste and old reverse osmosis membrane front and back with MXFJ-400, carry out ultraviolet sign
To repair the solution of waste and old reverse osmosis membrane front and back with MXFJ-400, carry out ultraviolet sign, result is as Fig. 2.From ultraviolet spectrogram, can find out, repair the front MXFJ-400 of waste and old reverse osmosis membrane and have two maximum absorption bands at 213nm and 272nm place, and 213nm place absworption peak absorb peak height than 272nm place; After repairing waste and old reverse osmosis membrane also there is maximum absorption band at 213nm and 272nm place in remaining MXFJ-400 solution, but its UV absorption at 213nm place diminishes, and the UV absorption at 272nm place becomes large.After in the MXFJ-400 aqueous solution, add some common metal ions, to investigate the impact of common metal ion on MXFJ-400.
(2) investigate the impact of various ion pair renovation agent MXFJ-400
Fe
3+impact on MXFJ-400
In the MXFJ-400 aqueous solution, add Fe
3+, find original water white MXFJ-400 aqueous solution browning look.To adding the MXFJ-400 solution of different amounts to carry out uv scan, as shown in Figure 3, from spectrogram, can find out, add Fe
3+there is obvious red shift in MXFJ-400 ultraviolet absorption peak afterwards, and significantly reduce in the UV absorption at 213nm and 272nm place; MXFJ-400 is to Fe in this explanation
3+there is very strong chelation, if a large amount of Fe is contained on film surface
3+, in the time of can causing chemistry to be repaired, the valid density of MXFJ-400 sharply reduces, and causes its repair ability to decline.So in to waste and old reverse osmosis membrane repair process, the iron dirt on film surface thoroughly need to be cleaned, the water that liquid is repaired in preparation also will remove Fe
3+process.
Al
3+impact on MXFJ-400
In MXFJ-400, add Al
3+, this mixed liquor is carried out to uv scan.Result as shown in Figure 4.As can be seen from the figure in MXFJ-400, add Al
3+there is remarkable red shift in 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+there is chelation.Al
3+exist and also can make the valid density of MXFJ-400 decline.Therefore, the water of preparation MXFJ-400 need remove Al
3+process, the Al dirt on waste and old reverse osmosis membrane surface also need to thoroughly be removed before cleaning.
Ca
2+impact on MXFJ-400
In the MXFJ-400 aqueous solution, add Ca
2+, mixed solution is carried out to uv scan, result is as shown in Figure 5.As can be seen from the figure, in MXFJ-400, add Ca
2+the red shift of ultraviolet absorption peak does not occur afterwards, and the UV absorption intensity at 213nm and 272nm place also remains unchanged substantially simultaneously.This illustrates Ca
2+little on MXFJ-400 impact.During preparation MXFJ-400, can not consider Ca
2+impact.
Zn
2+impact on MXFJ-400
In the MXFJ-400 aqueous solution, add Zn
2+, mixed solution is carried out to uv scan, 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 is had to synergistic effect, Zn
2+to a certain extent MXFJ-400 is activated, the valid density of MXFJ-400 is 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, by the performance study to renovation agent MXFJ-400, when using it to repair waste and old reverse osmosis membrane, need to first remove the Fe on film surface and Al dirt class, and the solvent of simultaneously preparing renovation agent also needs to remove Fe wherein
3and Al
3+.Ca
2+little on renovation agent impact.Zn
2+can increase the ability of renovation agent, carry out when reverse osmosis membrane is repaired in renovation agent, adding Zn
2+.
Accompanying drawing explanation
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
In Fig. 3 .MXFJ-400, add Fe
3+rear ultraviolet spectrogram
In Fig. 4 .MXFJ-400, add Al
3+rear ultraviolet spectrogram
In Fig. 5 .PMXFJ-400, add Ca
2+rear ultraviolet spectrogram
In Fig. 6 .MXFJ-400, add Zn
2+rear ultraviolet spectrogram
The waste and old reverse osmosis membrane of Fig. 7 cleans, the structure chart of prosthetic appliance
In figure: filter core exhaust-valve V0, running water valve V1, 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, pure water-Xin film water intaking valve V11 processed, 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:
No. 25 waste and old reverse osmosis membranes that the model that Nitto Denko Corp is produced is CPA3-8080 carry out the constituent analysis of film dirt, step is: the trapped substance sample that first gathers waste and old reverse osmosis membrane surface, use respectively chemical analysis, ESEM (SEM), x diffractometer to identify trapped substance sample, film dirt crystal structure pattern is as Fig. 1.The dirty class forming in waste and old reverse osmosis membrane is characterized and analyzed, confirm that pollution type is silicate and/or carbonate; Secondly analysis and the mensuration through three kinds of chemical methodes to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, white residue is silicon, dauk, calcium dirt; Crystalline lens profile is inorganic colloid, calcium dirt; The film dirt constituent analysis result that finally draws waste and old reverse osmosis membrane is that film dirt main component is SiO
2, also contain illite, micarex and clinochlore, mainly by Si, K, Ca, Mg, Al element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in Figure of description 7, use is carried out for cleaning agent of the present invention and the renovation agent of different film dirts, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, comprise desalination rate, the water rate of recovery, pressure reduction, computational methods are:
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 be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is normal temperature.
The various parameters that measure are as table 1.Before cleaning, the initial pressure reduction of this film is 1.25MPa, and film is blocked, cannot measure its initial desalination performance.First carry out back flush, the stream of film is opened.Subsequently, use a pair of its of formula to clean, its pressure reduction drops to 0.17MPa gradually, and 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 removing organic matter, colloid and the SiO2 etc. on film surface.After cleaning, desalination rate drops to 69.9%, and the water rate of recovery rises to 19.2%, and pressure reduction drops to 0.15MPa.Through repeatedly filling a prescription one, fill a prescription three repeatedly clean after, finally use renovation agent to carry out chemistry reparation to it, making desalination rate is 86.9%, the water rate of recovery is 13.8%, 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, be that electrical conductivity is at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is under normal temperature condition, measure respectively the various performance parameters of new reverse osmosis membrane and waste and old reverse osmosis membrane, desalination rate is 99.5%, fresh water electrical conductivity 2.51 μ s cm
-1, the water rate of recovery 17.9%, permeable amount is 40.3M
3d
-1, pressure reduction is 0.07MPa.
(2) parameters measuring 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 declines, and the water rate of recovery of new reverse osmosis membrane is about 15% left and right, and the water rate of recovery of waste and old reverse osmosis membrane is worth far below this; 3. desalination rate declines.New film desalination rate is generally greater than 99%, and the desalination rate of waste and old reverse osmosis membrane declines a lot.
(3) for various dirty class, clean respectively, under same test condition, carry out the measurement of parameters.
(4) performance of the waste and old reverse osmosis membrane of contrast after cleaning and new reverse osmosis membrane, and parameters is demarcated, until it is suitable to reach both performances, the criterion of acceptability of having established waste and old reverse osmosis membrane cleaning is: 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 recording after above-mentioned cleaning reparation has all reached cleaning criterion of acceptability, and this waste and old reverse osmosis membrane performance is basic and new film is approaching.
Embodiment 2:
No. 5 waste and old reverse osmosis membranes that the model that Dow Chemical is produced is BW30-400 carry out the constituent analysis of film dirt according to the method for embodiment 1 and step, first confirm that pollution type is silicate and/or carbonate; Secondly analysis and the mensuration through three kinds of chemical analysis methods to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, white residue is silicon, dauk, calcium dirt; Crystalline lens profile is calcium dirt; , the film dirt constituent analysis result that finally draws waste and old reverse osmosis membrane is that film dirt main component is SiO
2, also contain illite, micarex and clinochlore, mainly by Si, K, Ca, Mg, Al element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in Figure of description 7, use is carried out for cleaning agent of the present invention and the renovation agent of different film dirts, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, comprise desalination rate, the water rate of recovery, pressure reduction, computational methods are:
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 be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring 1 temperature is that running water water temperature is normal temperature.
The various parameters that record are as table 2.The initial desalination rate of this film is 96.6%, and fresh water electrical conductivity is 17.6%, and pressure reduction is 0.20MPa.Through formula one, three repeatedly clean 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 declined, according to the method for embodiment 1, determine the cleaning criterion of acceptability of waste and old reverse osmosis membrane, both parameters are compared to discovery, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached cleaning criterion of acceptability, and this old reverse osmosis membrane has approached the performance of new film substantially.
Table 2.5 film cleaning reagent and parameter
Embodiment 3:
No. 6 waste and old reverse osmosis membranes that the model that Nitto Denko Corp is produced is CPA3-8080 carry out the constituent analysis of film dirt according to the method for embodiment 1 and step, and confirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly analysis and the mensuration through three kinds of chemical analysis methods to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, brown residue is iron dirt; White residue is silicon, dauk, calcium dirt; Crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant, be thick judgement, also contain biofouling or organic dirt, the film dirt constituent analysis result that finally draws waste and old reverse osmosis membrane is that film dirt main component is SiO
2, also contain illite, micarex and clinochlore, mainly by Si, K, Ca, Mg, Fe, Al, C element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in Figure of description 7, use is carried out for cleaning agent of the present invention and the renovation agent of different film dirts, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, comprise desalination rate, the water rate of recovery, pressure reduction, computational methods are:
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 be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is normal temperature.
The various parameters that record are as table 3.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 large.From the initial desalination performance of film, can find out, the film water rate of recovery is on the low side, and pressure reduction is higher.Through desalination rate after cleaning, be 98.8%, the water rate of recovery is 18.6%, risen 6.6%, pressure reduction is 0.19MPa, the 0.11MPa that declined, determines according to the method for embodiment 1 and the cleaning criterion of acceptability of waste and old reverse osmosis membrane both parameters is compared to discovery, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached cleaning criterion of acceptability, and this old reverse osmosis membrane has approached the performance of new film substantially.
Table 3.6 film cleaning reagent and parameter
Embodiment 4:
No. 267 waste and old reverse osmosis membranes that the model that Nitto Denko Corp is produced is CPA3-8080 carry out the constituent analysis of film dirt according to the method for embodiment 1 and step, confirm that pollution type is silicate and/or ferriferous oxide; Secondly analysis and the mensuration through three kinds of chemical analysis methods to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, brown residue is iron dirt; White residue is silicon, dauk, calcium dirt; Crystalline lens profile is inorganic colloid, calcium dirt; The film dirt constituent analysis result that finally draws waste and old reverse osmosis membrane is that film dirt main component is SiO
2, also contain illite, micarex and clinochlore, mainly by Si, Ca, Mg, Fe, C element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in Figure of description 7, use is carried out for cleaning agent of the present invention and the renovation agent of different film dirts, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, comprise desalination rate, the water rate of recovery, pressure reduction, computational methods are:
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 be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is normal temperature.
The various parameters that record are as table 4.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 declined, determines according to the method for embodiment 1 and the cleaning criterion of acceptability of waste and old reverse osmosis membrane both parameters is compared to discovery, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached cleaning criterion of acceptability, and this old reverse osmosis membrane has approached the performance of new film substantially.
Table 4.267 film cleaning reagent and parameter
Embodiment 5:
No. 47 waste and old reverse osmosis membranes that the model that Nitto Denko Corp is produced is CPA3-8080 carry out the constituent analysis of film dirt according to the method for embodiment 1 and step, confirm that pollution type is silicate and/or ferriferous oxide; Secondly analysis and the mensuration through three kinds of chemical analysis methods to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, brown residue is iron dirt; From the form of smell and pollutant, be thick judgement, also contain biofouling or organic dirt, the film dirt constituent analysis result that finally draws waste and old reverse osmosis membrane is that film dirt main component is SiO
2, also contain illite, micarex and clinochlore, mainly by Si, K, Ca, Mg, Fe, Al, C element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in Figure of description 7, use is carried out for cleaning agent of the present invention and the renovation agent of different film dirts, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, comprise desalination rate, the water rate of recovery, pressure reduction, computational methods are:
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 be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is normal temperature.
The various parameters that record are as table 5.Before cleaning, the initial pressure reduction of this film is 1.26MPa, and film is blocked, cannot measure its initial desalination performance.First carry out back flush, the stream of film is opened.Subsequently, use a pair of its of formula to clean, its pressure reduction drops to 0.16MPa gradually, and 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 removing organic matter, colloid and the SiO2 etc. on film surface.After cleaning, desalination rate drops to 69.4%, and the water rate of recovery rises to 19.7%, and pressure reduction drops to 0.15MPa.Through repeatedly filling a prescription two, after four the cleaning repeatedly of filling a prescription, finally use renovation agent to carry out chemistry reparation to it, making 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 according to the method for embodiment 1, and both parameters are compared to discovery, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached cleaning criterion of acceptability, and this old reverse osmosis membrane has approached the performance of new film substantially.
Table 5.47 film cleaning reagent and parameter change
Embodiment 6:
No. 56 waste and old reverse osmosis membranes that the model that Nitto Denko Corp is produced is CPA3-8080 carry out the constituent analysis of film dirt according to the method for experimental example 1 and step, confirm that pollution type is silicate and/or carbonate; Secondly analysis and the mensuration through three kinds of chemical analysis methods to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, from the form of smell and pollutant, it is thick judgement, in waste and old reverse osmosis membrane dirt, contain biofouling or organic dirt, the film dirt constituent analysis result that finally draws waste and old reverse osmosis membrane is that film dirt main component is SiO
2, also contain organic matter, mainly by Si, K, Ca, Al, C element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in Figure of description 7, use is carried out for cleaning agent of the present invention and the renovation agent of different film dirts, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, comprise desalination rate, the water rate of recovery, pressure reduction, computational methods are:
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 be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is normal temperature.
The various parameters that record are as table 6.Before cleaning, the initial pressure reduction of this film is 1.25MPa, and film is blocked, cannot measure its initial desalination performance.First carry out back flush, the stream of film is opened.Subsequently, use a pair of its of formula to clean, its pressure reduction drops to 0.17MPa gradually, and 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 removing organic matter, colloid and the SiO2 etc. on film surface.After cleaning, desalination rate drops to 69.8%, and the water rate of recovery rises to 19.2%, and pressure reduction drops to 0.15MPa.Through repeatedly filling a prescription four, fill a prescription five repeatedly clean after, finally use renovation agent to carry out chemistry reparation to it, making 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 according to the method for embodiment 1, and both parameters are compared to discovery, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached cleaning criterion of acceptability, and this old reverse osmosis membrane has approached the performance of new film substantially.
Table 6.56 film cleaning reagent and parameter change
Embodiment 7:
No. 38 waste and old reverse osmosis membranes that the model that Nitto Denko Corp is produced is CPA3-8080 carry out the constituent analysis of film dirt according to the method for experimental example 1 and step, and confirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly analysis and the mensuration through three kinds of chemical analysis methods to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, the classification of judgement dirt, white residue is silicon, dauk, calcium dirt; Crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant, be thick judgement, also contain biofouling or organic dirt, the film dirt constituent analysis result that finally draws waste and old reverse osmosis membrane is that film dirt main component is SiO
2, also contain illite, micarex and clinochlore, mainly by Si, K, Ca, Mg, Al, C element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, the prosthetic appliance shown in Figure of description 7, use is carried out for cleaning agent of the present invention and the renovation agent of different film dirts, under the meter per second condition of flow rate of liquid >=10, 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, chemical repair process, comprise desalination rate, the water rate of recovery, pressure reduction, computational methods are:
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 be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa, measuring temperature is that running water water temperature is normal temperature.
The various parameters that record are as table 7.Before cleaning, the initial pressure reduction of this film is 1.25MPa, and film is blocked, cannot measure its initial desalination performance.First carry out back flush, the stream of film is opened.Subsequently, use a pair of its of formula to clean, its pressure reduction drops to 0.17MPa gradually, and 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 removing organic matter, colloid and the SiO2 etc. on film surface.After cleaning, desalination rate drops to 69.7%, and the water rate of recovery rises to 19.4%, and pressure reduction drops to 0.15MPa.Through repeatedly filling a prescription four, fill a prescription two repeatedly clean after, finally use renovation agent to carry out chemistry reparation to it, making 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 according to the method for embodiment 1, and both parameters are compared to discovery, the parameters of cleaning the waste and old reverse osmosis membrane after repairing has all reached cleaning criterion of acceptability, and this old reverse osmosis membrane has approached the performance of new film substantially.
No. 38 film cleaning reagents of table 7 and parameter change
Claims (11)
1. for the film dirt of different waste and old reverse osmosis membranes, carry out a method for off-line type cleaning, reparation, comprise the steps:
(1) the film dirt constituent analysis to waste and old reverse osmosis membrane, step is: the trapped substance sample that first gathers waste and old reverse osmosis membrane surface, use respectively chemical analysis, scanning electron microscope analysis, X diffractometer Analysis and Identification trapped substance sample, the dirt forming in waste and old reverse osmosis membrane is characterized and analyzed, and confirmation pollution type is silicate, carbonate and/or ferriferous oxide; Secondly analysis and the mensuration through three kinds of chemical methodes to the film dirt of different pollution types, show that the film dirt of waste and old reverse osmosis membrane becomes to be grouped into; Finally in the time can not carrying out chemical analysis, utilize color, the density of residue on the test counter-infiltration diaphragm of SDI instrument, judgement dirt is categorized as: brown residue is iron dirt; White residue is silicon, dauk, calcium dirt; Crystalline lens profile is inorganic colloid, calcium dirt; From the form of smell and pollutant, be thick judgement, also contain 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 by Si, K, Ca, Mg, Fe, Al element, formed;
(2) according to the film dirt constituent analysis result of waste and old reverse osmosis membrane, utilize waste and old reverse osmosis membrane cleaning, prosthetic appliance, use is carried out high speed cleaning for cleaning agent and the renovation agent of different film dirts under the meter per second condition of flow rate of liquid >=10, under pressure >=1.5Mpa condition, repairs;
Wherein, described cleaning agent and renovation agent be, for inorganic salt crust, the reagent that waste and old reverse osmosis membrane off-line type cleans is 0.1-0.5%HCl solution, and cleaning condition is: pH value 1-4, temperature <38 ℃; For metal oxide dirt, 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 being insoluble to sour dirt, 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 is: pH value 11-12, temperature <30 ℃; For inorganic colloid is dirty, silicon is dirty or microorganism is dirty, 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, 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 ℃, after alkali cleaning, use 0.2%HCl acidic cleaning solution, cleaning condition is: pH value 1-2, temperature <38 ℃; Waste and old reverse osmosis membrane off-line type is repaired reagent: the pore former MXFJ-400 that U.S. Sheng Daya Science and Technology Ltd. produces, and lot number is: FJ-090708D;
(3) in Chemical cleaning, chemical repair process; the relevant parameter of METHOD FOR CONTINUOUS DETERMINATION film properties, condition determination is: medium be electrical conductivity at the running water of 450-550 μ s/cm, mensuration pressure is 1.5MPa; measuring temperature is that running water water temperature is normal temperature, cleans and repairs to reaching criterion of acceptability;
It is characterized in that, described waste and old reverse osmosis membrane cleans, the structure of prosthetic appliance forms 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, described valve is by filter core exhaust-valve V0, running water valve V1, 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, pure water-Xin film water intaking valve V11 processed, 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 comprised 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 comprised 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 comprised of the gross pressure table P1 of intaking, new film inlet gage P2 and new film delivery gauge P3,
Accurate filter PP1 entrance is connected with municipal tap water pipe by running water valve V1, and 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 is connected 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 is connected 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 is connected with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2, the dense water out of waste and old reverse osmosis membrane 6 is by the dense water out valve of old film V9, new film flow of inlet water meter F2, new film water intaking valve V13 is connected with new film 7 imports, the new film inlet gage P2 of middle serial connection, new film water inlet conductivity meter E2 is connected with PP2 accurate filter entrance by new film short valve V15 simultaneously, and 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 are connected, the old film fresh water conductivity meter E3 of middle serial connection, and end meets fresh water drain valve V16, is connected by pure water-Xin film water intaking valve V11 processed with new film 7 imports simultaneously, and the new dense water out of reverse osmosis membrane 7 is by the dense water out valve of new film V14, dense water check (non-return) valve V24 is connected with accurate filter PP2 entrance, the new film delivery gauge P3 of middle serial connection, and 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 are connected, and end meets fresh water drain valve V16, and 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 are connected, and end meets concentrated water discharge valve V17.
2. a kind of method of carrying out off-line type cleaning, reparation for the film dirt of different waste and old reverse osmosis membranes according to claim 1, is characterized in that, described inorganic salt crust is calcium dirt.
3. a kind of method of carrying out off-line type cleaning, reparation for the film dirt of different waste and old reverse osmosis membranes according to claim 1, is characterized in that, described metal oxide dirt is that iron is or/and aluminium is dirty.
4. a kind of method of carrying out off-line type cleaning, reparation for the film dirt of different waste and old reverse osmosis membranes according to claim 1, is characterized in that, described inorganic colloid dirt is mud.
5. a kind of method of carrying out off-line type cleaning, reparation for the film dirt of different waste and old reverse osmosis membranes according to claim 1, is characterized in that, the described sour dirt that is insoluble to is CaF
2, BaSO
4, SrSO
4or CaSO
4.
6. according to the arbitrary described method of carrying out off-line type cleaning, reparation for the film dirt of different waste and old reverse osmosis membranes of claim 1-5, it is characterized in that, described reparation reagent MXFJ-400 adds Zn while repairing during obtain solution carrying out reverse osmosis membrane
2+.
7. the method that the off-line type carrying out for 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 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.
8. the method that the off-line type carrying out for 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 desalination rate, and the water rate of recovery reaches more than 12%, and pressure reduction is lower than 0.2MPa.
9. the method that the off-line type carrying out for 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, medium be electrical conductivity at the running water of 450-550 μ s/cm, mensurations pressure is 1.5MPa, mensuration temperature is that running water water temperature is under normal temperature condition, measures respectively the various performance parameters of new reverse osmosis membrane and waste and old reverse osmosis membrane;
(2) parameters measuring 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 declines, 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. desalination rate declines; New film desalination rate is generally greater than 99%, and the desalination rate of waste and old reverse osmosis membrane declines a lot, generally lower than 80%;
(3) for various dirt, clean respectively, under same test condition, carry out the measurement of parameters;
(4) performance of the waste and old reverse osmosis membrane of contrast after cleaning and new reverse osmosis membrane, and parameters is demarcated, until it is suitable to reach both performances, established the criterion of acceptability that waste and old reverse osmosis membrane cleans reparation.
10. the method that the off-line type carrying out for the film dirt of different waste and old reverse osmosis membranes according to claim 6 cleans, repairs, is characterized in that, before described waste and old reverse osmosis membrane reparation, first removes Fe
3+and Al
3+.
The method that 11. off-line types that carry out according to the arbitrary described film dirt for different waste and old reverse osmosis membranes of claim 7-10 clean, repair, is characterized in that, before described waste and old reverse osmosis membrane reparation, first removes Fe
3+and Al
3+.
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| 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 |
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| 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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| CN102179180B (en) * | 2011-03-14 | 2013-05-15 | 四川科伦药业股份有限公司 | Off-line washing and repairing device for multifunctional waste reverse osmosis membrane |
| CN102210978B (en) * | 2011-03-14 | 2014-03-05 | 四川科伦药业股份有限公司 | Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode |
| EP2745917B1 (en) * | 2012-12-18 | 2022-01-19 | Grundfos Holding A/S | A liquid fluid filter assembly |
| IL251168B (en) * | 2017-03-14 | 2019-08-29 | Efraty Avi | Integrated reverse osmosis and membrane cleaning systems for fouling prevention |
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| WO2012122892A1 (en) | 2012-09-20 |
| CN102210978A (en) | 2011-10-12 |
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