CN102085455A - Chemical cleaning and chemical repairing method and system for waste reverse osmosis membrane - Google Patents
Chemical cleaning and chemical repairing method and system for waste reverse osmosis membrane Download PDFInfo
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- CN102085455A CN102085455A CN 201010600223 CN201010600223A CN102085455A CN 102085455 A CN102085455 A CN 102085455A CN 201010600223 CN201010600223 CN 201010600223 CN 201010600223 A CN201010600223 A CN 201010600223A CN 102085455 A CN102085455 A CN 102085455A
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Abstract
The invention discloses a chemical cleaning and chemical repairing method and system for a waste reverse osmosis membrane, belonging to the field of water treatment, wherein the method and system can be used for regenerating the waste reverse osmosis membrane, reducing the water production cost and saving resources. The method disclosed by the invention comprises the following steps: producing pure water for preparing a chemical cleaning-repairing liquid, and storing the pure water in a corresponding container; carrying out back flushing on the waste membrane by utilizing a high-pressure pump, and flushing out the dirt deposited in the water inlet area of the membrane; carrying out forward pumping pm the cleaning liquid into the waste membrane, wherein one part of the cleaning liquid passes through the waste membrane and flows back to the container, and the other part of the cleaning liquid is subjected to chemical reaction with the residual dirt on the surface of the membrane; removing insoluble substances by utilizing a filter before the cleaning liquid flows back to the container; and performing circular cleaning; and if the water recovery rate of the waste membrane is excessively high and the salt removal rate is relatively low after the chemical cleaning, pumping the repairing liquid into the waste membrane again, wherein the repairing liquid passes through the waste membrane to perform circular repairing, and finally the performance parameters of the repaired waste membrane are approximate to those of a new membrane. The method and system disclosed by the invention have the characteristics that the performance parameters of the membrane cleaning process are calculated by use of the display values of a monitoring instrument of the cleaning system, and the chemical cleaning and repairing processes for the membrane are further instructed.
Description
Technical field
The present invention relates to waste and old Chemical Cleaning for Reverse Osmosis and chemical method and system of repairing, belong to water-treatment technology field.Be applicable to the mensuration of waste and old reverse osmosis membrane being carried out Chemical cleaning and chemistry reparation and reverse osmosis membrane performance.
Background technology
Reverse osmosis technology is widely used in water treatment field at present, and its operation principle is to be power with the pressure differential, utilizes the selection permeability of film to reach separating of solvent and solute.Because the selection permeability of film, solute concentrates on the reverse osmosis membrane surface in the water inlet, and the formation precipitation is attached to the reverse osmosis membrane surface or is jammed in the reverse osmosis membrane fenestra, causes reverse osmosis membrane to pollute, and performance descends.Because the difference of influent quality, the material that pollutes reverse osmosis membrane comprises hydrated metal oxide, carbonate, Sulfates, silicic acid class, organic matter class, microbiology class etc.; The difference of the time length that forms according to pollutant, the dirt that pollutant forms may be durable or loose, thereby can remove at film surface formation eddy current by improving flow of inlet water for loose dirt, take the method for Chemical cleaning to dissolve removal for solid dirt.
At the pollutant of heterogeneity, need to adopt the chemical cleaning solution of different formulations to clean.The alkaline cleaning fluid that contains EDTA and NaOH is more effective to the cleaning of microorganism, organic matter and silica; HCl is then to metal oxide colloids, hardness (Ca
2+And Mg
2+), the carbonate pollutant has better cleaning effect; NaHSO
3Solution has effect preferably for the microorganism that kills in the reverse osmosis membrane; Then need NaOH solution and HCl solution alternately to clean for organic matter class, silicates pollutant, then take in NaOH solution, to add the cleaning fluid of EDTA at the Sulfates pollutant.
Industrial reverse osmosis membrane mostly is 8 inches reverse-osmosis membrane elements, and this class reverse osmosis membrane aquifer yield is generally 1.5 ~ 1.8 m
3h
-1, price be 5000-8000 unit/, quality guarantee is generally 3 years.At present, the domestic industry aquifer yield surpasses 100 m
3h
-1Counter-infiltration system surpassed 200 covers.The maximum engineering of having built up is chemical plant, Cangzhou 750 m
3h
-114000mg L
-1Inferior desalinization engineering; 2002 is two covers, 2000 m of Shanghai Golconda steel mill and Taiyuan steel mill in the maximum engineering of building
3h
-1R level steel rolling water system; The maximum project of power industry is 100 m in Yantai and Dalian
3h
-1The power plant water engineering; Barreled, bottled water counter-infiltration production line aquifer yield surpass 500 m
3d
-1Existing tens covers, that maximum is 1000 m
3d
-1Estimate near in two years will be in Shandong, the drinking water production system of ten thousand tons of daily outputs appears in Dalian.Along with the aggravation of the northern area of China climate arid and industry, civilian to the improving constantly of the water yield, water quality requirement, the embrane method desalinization must be from present peculiar to vessel, island with being main to industry, the development of municipal field, the having a high potential of market.Reverse-osmosis membrane element is widely used, but because of the factor of water quality usually pollutes, causes reverse osmosis membrane desalination performance to descend, produce water-based energy variation etc.; If do not regenerate these waste and old reverse osmosis membranes, will improve production cost greatly; And dispose the difficult problem that waste and old reverse osmosis membrane also can become environmental protection.If can carry out cheaply (reverse-osmosis membrane element price about 10%) Chemical cleaning to waste and old reverse osmosis membrane and chemistry is repaired, old reverse osmosis membrane can be recycled, will reduce industry greatly and produce the water cost, reduce resource, the environmental problem brought when waste and old reverse osmosis membrane is disposed; In view of this, waste and old reverse osmosis membrane is carried out Chemical cleaning and just seem particularly important with chemistry reparation.
At present, the cleaning for reverse osmosis membrane is divided into on-line cleaning and off-line cleaning two big classes.On-line cleaning does not refer to reverse-osmosis membrane element is taken out, and directly imports chemical cleaning solution on system water production line and cleans.This cleaning method is effective to polluting very light reverse-osmosis membrane element, but the membrane component that the degree of depth is polluted is invalid.Its reason is: (1). various system water conservancy project factory is when carrying out the reverse osmosis membrane on-line cleaning, often only can take simple cleaning way and single cleaning formulation to go to tackle dissimilar pollutants or dirty class in the membrane component, chemical cleaning solution can not carry out chemical reaction with pollutant, dirty class pointedly, so cleaning performance is very poor; (2). and since be communicated with in the reverse osmosis membrane water manufacturing system membrane module pipeline length difference, resistance to water-flow difference, cause chemical cleaning solution in every membrane module series connection or in parallel, evenly not distribute, cause chemical cleaning solution different, make the cleaning performance of water inlet end membrane module and rear end membrane module widely different with the dirty class extent of reaction; (3). the dirty class that front end washes down during many membrane component series connection enters the membrane component of rear end, because change in flow is detained in it it, the rear end membrane component is caused secondary pollution; (4). very low in higher in the front end membrane component, the rear end membrane component of the concentration of chemical cleaning solution during the series connection of many membrane components, cause the cleaning performance of rear and front end membrane component widely different.In a word, the on-line cleaning of film can not make the pollutant in the reverse osmosis membrane thoroughly be cleaned, and causes the waste of Chemical cleaning reagent.
The off-line of reverse osmosis membrane cleans several different methods, below narration respectively.
A kind of reverse osmosis membrane cleaning device that utility model patent (No. ZL200420033221.0) is described, its structure is comparatively simple, only can monitor the water inlet conductance of reverse osmosis membrane and produce water conductivity, and the product water-based that can not provide reverse osmosis membrane can index, can't judge cleaning performance when therefore, carrying out Chemical cleaning with this device; In addition,,, then need waste discharge repeatedly and prepare different types of cleaning fluid repeatedly, cause a large amount of wastes of chemical reagent carrying out acid, alkali when alternately cleaning because this device only has a soda liquor container; The bottom does not have drain valve in this device soda liquor container, makes that the thorough discharging of cleaning fluid is also very difficult; Though many reverse osmosis modules of this system are arranged in parallel, also can only carry out unimodule when cleaning and clean, can not in parallelly simultaneously clean, if in parallel simultaneously the cleaning, the drawback when then having above-mentioned on-line cleaning.
Subsequently, above-mentioned patent is being carried out on the improved basis, reverse osmosis membrane assembly off-line of describing in two utility model patents (ZL200520025713.X, 200520025746.4) and online anti-cleaning device realize that the fresh water of reverse osmosis membrane oppositely cleans.But, owing in the use of reverse osmosis membrane, require the back pressure of film very low (Tao Shi reverse osmosis membrane product requirement back pressure≤0.35bar), so utilize this system to carry out fresh water when oppositely cleaning, backwashing pump institute's applied pressure and reverse osmosis membrane surface pressing difference will keep very little, cause operation easier to increase, and the operation that this fresh water oppositely cleans is abnormally dangerous, be easy to the functional membrane of reverse-osmosis membrane element is punctured, cause membrane component to be scrapped.In addition, this device is to clean many reverse-osmosis membrane elements simultaneously, and with the on-line cleaning similar process of film, cleaning performance is very poor.
A kind of multifunctional off-line cleaning device for reverse osmosis membrane (200510016025.1) that Tianjin Chemical Research ﹠ Desing Inst proposes also can carry out fresh water to reverse osmosis membrane and oppositely clean, and some performance datas of reverse osmosis membrane also can be provided; But, cause the reverse osmosis membrane of severe contamination can not obtain Chemical cleaning completely because the reverse osmosis membrane of this device parallel connection is too much; And its conductivity meter is installed in total pure water end and total dense water end (W.E.), and the desalination performance, the product water-based that cause obtaining can all be the data of whole system, rather than the data of single reverse osmosis membrane, and the result can't judge the quality that every reverse osmosis membrane cleans; The cleaning fluid fresh water that this system produces can not be back to soda liquor container, causes concentration of lotion increase infringement reverse osmosis membrane, pollutant levels to increase and pollutes reverse osmosis membrane again; Do not filter during the cleaning fluid concentrate recirculation, the particulate matter that causes washing down enters reverse osmosis membrane once more, causes the damage of reverse osmosis membrane.
In the offline model reverse osmosis membrane cleaning device of in utility model patent (ZL200620108379.9), describing, for improving rinse liquid temperature, to soda liquor container a heater has been installed, but that the problem of bringing simultaneously is a heating power is big, power consumption, the electric leakage in the operation is dangerous to increase; In the cleaning operation process of reality, because the effect of pump, the temperature of cleaning fluid can constantly raise, and does not need extra heater.It is the preparation and discharging difficulty of cleaning fluid that also there is following shortcoming in this device, can't realize the back flush procedure that flushing water flows out from dense water side inflow, influent side; A soda liquor container can not be realized alternately cleaning fast of variety classes cleaning fluid, the waste chemical reagent; This device is not provided with relevant chemical instruments, can not provide every reverse osmosis membrane after the Chemical cleaning the desalination performance, produce water-based energy and two ends pressure reduction; This device can not clean single reverse osmosis membrane, can't judge the cleaning performance of single film.
The cleaning method (ZL200710036315.1) that also has a kind of film is that the coiled reverse osmosis membrane after polluting is disintegrated, and every page of film is cleaned respectively, utilizes industrial process with the film backrush of disintegrating, fw frp shell more afterwards.Though this method can thoroughly be cleaned film surface dirt, owing to take film body apart reduced film compressive property, thereby cause difficult cleaning of dirt in the fenestra, and this method complex process, complex operation, cost are higher, are unfavorable for promoting.
The subject matter that existing reverse osmosis membrane membrane off-line cleaning system exists is: can not carry out specific performance properties mensuration, specific Chemical cleaning, specific chemistry reparation at various specific reverse osmosis membranes, cause the off-line Chemical cleaning of reverse osmosis membrane to have blindness, the Chemical cleaning effect is undesirable; And the operation that fresh water oppositely cleans is easy to reverse osmosis membrane is punctured, and causes film to be scrapped; Complete reverse osmosis membrane membrane off-line cleaning system and device at first will have the function of every reverse osmosis membrane performance parameter of timely on-line monitoring, and then set cleaning program, cleaning step and operating process according to the film properties parameter that obtains, judge cleaning performance according to the changing value of every reverse osmosis membrane performance parameter at last.
Summary of the invention
The objective of the invention is in order to solve the problem that prior art exists, develop a kind of method and system that waste and old Chemical Cleaning for Reverse Osmosis and chemistry are repaired that are specifically designed to, solve the problem that existing off-line cleaning device for reverse osmosis membrane runs into when Chemical cleaning: can not monitor single film properties, clean not thoroughly, chemical reagent waste, fresh water oppositely clean and cause reverse osmosis membrane puncture etc.By our invention, the off-line of reverse osmosis membrane is cleaned can be simple to operate, save chemical reagent, improve Chemical cleaning economy, reduce environmental pollution, and can carry out performance measurement to reverse osmosis membrane in real time, judge whether thoroughly to clean waste and old reverse osmosis membrane.
Technical scheme of the present invention is made up of with chemical repair method and system Chemical cleaning.
Chemical cleaning of the present invention and chemical repair method scheme: the first step prepares fresh water and is used to dispose various solution, and the measured performance parameter that carries out new reverse osmosis membrane simultaneously is used for the comparison with old reverse osmosis membrane; Concrete grammar is, under the pressure of running water, running water is through charcoal filter, first candle filter enters the running water container, under the effect of high-pressure pump, the running water of the running water container new reverse osmosis membrane water inlet pipe of flowing through enters new reverse osmosis membrane, the fresh water that produces flows into the acidic cleaning solution container respectively through new reverse osmosis membrane fresh water return duct, alkaline cleaning fluid container and reparation liquid container, this fresh water is used to prepare various relevant chemical solutions, the dense water that new reverse osmosis membrane produces is through new reverse osmosis membrane concentrate recirculation pipe, second candle filter returns the running water container, the system that circulates water; Second step, use the initial performance parameter of the running water of water stabilization as the old reverse osmosis membrane of sample determination, then old reverse osmosis membrane is carried out running water backwash in advance; Concrete grammar is, under the pressure of running water, running water enters the running water container through charcoal filter, first candle filter, then, running water is under the effect of high-pressure pump, the old reverse osmosis membrane concentrate recirculation pipe of flowing through enters old reverse osmosis membrane, and the dirt on reverse osmosis membrane surface is carried out back flush, again from the concentrated water discharge valve discharging of old reverse osmosis membrane water inlet pipe; The 3rd step, acidic cleaning solution flows out from the acidic cleaning solution container under the effect of high-pressure pump, enter old reverse osmosis membrane through old reverse osmosis membrane water inlet pipe, the fresh water that produces returns the acidic cleaning solution container through old reverse osmosis membrane fresh water return duct, the dense water that produces returns the acidic cleaning solution container through old reverse osmosis membrane concentrate recirculation pipe, second candle filter, and acidic cleaning solution is recycled; The 4th step, alkaline cleaning fluid flows out from the alkaline cleaning fluid container under the effect of high-pressure pump, enter old reverse osmosis membrane through old reverse osmosis membrane water inlet pipe, the fresh water that produces returns the alkaline cleaning fluid container through old reverse osmosis membrane fresh water return duct, the dense water that produces returns the alkaline cleaning fluid container through old reverse osmosis membrane concentrate recirculation pipe, second candle filter, and alkaline cleaning fluid is recycled; The 5th step, repairing liquid flows out from repairing liquid container under the effect of high-pressure pump, enter old reverse osmosis membrane through old reverse osmosis membrane water inlet pipe, the fresh water that produces returns the reparation liquid container through old reverse osmosis membrane fresh water return duct, the dense water that produces returns the reparation liquid container through old reverse osmosis membrane concentrate recirculation pipe, second candle filter, and reparation liquid is recycled.
Reverse osmosis membrane performance parametric measurement process of the present invention: running water enters the running water container through charcoal filter, first candle filter, under the effect of high-pressure pump, the running water of water stabilization is as specimen, from the running water container, flow out, enter old reverse osmosis membrane through old reverse osmosis membrane water inlet pipe, the fresh water that produces returns the running water container through old reverse osmosis membrane fresh water return duct, and the dense water of generation returns the running water container through old reverse osmosis membrane concentrate recirculation pipe, second candle filter; Simultaneously, the dense water pressure table of intake pressure value, old reverse osmosis membrane in the time of can obtaining running water by old reverse osmosis membrane by the old reverse osmosis membrane inlet gage in the system can obtain the dense water lateral pressure of old reverse osmosis membrane value, thereby obtains old reverse osmosis membrane two ends pressure reduction.The size of reverse osmosis membrane two ends pressure difference has reflected the degree of reverse osmosis membrane pollution, fouling and obstruction, and the big more reverse osmosis membrane of pressure difference is contaminated serious more; Its calculating formula is seen formula 1:
△P?=?P
1?–?P
2 (1)
In the formula 1, △ P is pressure differential (MPa), P
1Be old reverse osmosis membrane intake pressure (MPa), P
2Be the dense water lateral pressure of old reverse osmosis membrane (MPa); By the water inlet conductivity value of water inlet conductivity meter when obtaining running water, obtain its fresh water conductivity value, can obtain the desalination rate of old reverse osmosis membrane as calculated by the fresh water conductivity meter by old reverse osmosis membrane; The desalination rate has reflected the desalination performance of reverse osmosis membrane; Desalination rate height illustrates that the purity height of reverse osmosis produced water, contained soluble salts are few; Its calculating formula is seen formula 2:
y?=?(E
1-E
2)/E
1?×?100% (2)
In the formula, y is the desalination rate, E
1Be water inlet electrical conductivity (μ s/cm), E
2Be fresh water electrical conductivity (μ s/cm); Flow of inlet water when obtaining running water by old reverse osmosis membrane, obtain its fresh-water flow, can obtain the water rate of recovery and the water yield per day of old reverse osmosis membrane as calculated by the fresh-water flow meter by old reverse osmosis membrane flow of inlet water meter; The water rate of recovery and water yield per day have all reflected the water-yielding capacity of reverse osmosis membrane, and the aquifer yield that the water rate of recovery is crossed low then reverse osmosis membrane is just little, otherwise the desalination rate of film reduces, produces the water deteriorating water quality; The calculating formula of the water rate of recovery and water yield per day is suc as formula shown in 3,4:
z?=?V
2/V
1?×?100% (3)
Q?=?24?×V
2 (4)
In the formula 3, V
2Be fresh-water flow (m
3/ h), V
1Be flow of inlet water (m
3/ h); In the formula 4, Q is water yield per day (m
3/ d), V
2Be fresh-water flow (m
3/ h).The performance parameters such as pressure reduction, desalination rate, the water rate of recovery and water yield per day of the present invention by the on-line monitoring reverse osmosis membrane be the performance of overall merit reverse osmosis membrane in time, and can instruct the Chemical cleaning and the repair process of reverse osmosis membrane according to these parameters, when the performance parameter of old reverse osmosis membrane during near new film, Chemical cleaning with repair and can finish.
Chemical cleaning of the present invention and chemical repair system device are by the running water water intaking valve, charcoal filter, the charcoal filter backwash valve, first candle filter, the filter atmospheric valve, the running water container, the acidic cleaning solution container, the alkaline cleaning fluid container, repair liquid container, running water concentrate recirculation valve, running water fresh water return valve, the running water outlet valve, acidic cleaning solution concentrate recirculation valve, acidic cleaning solution fresh water return valve, the acidic cleaning solution outlet valve, alkaline cleaning fluid fresh water return valve, alkaline cleaning fluid concentrate recirculation valve, the alkaline cleaning fluid outlet valve, repair liquid fresh water return valve, repair liquid concentrate recirculation valve, repair the liquid outlet valve, pH meter, the water inlet conductivity meter, high-pressure pump, pressure-reducing valve, total water intaking valve, old reverse osmosis membrane inlet gage, old reverse osmosis membrane backwash non-return valve, old reverse osmosis membrane flow of inlet water meter, old reverse osmosis membrane water intaking valve, old reverse osmosis membrane, old reverse osmosis membrane bypass valve, old reverse osmosis membrane backwash water intaking valve, the dense water pressure table of old reverse osmosis membrane, old reverse osmosis membrane fresh water valve, old reverse osmosis membrane fresh water conductivity meter, old reverse osmosis membrane fresh-water flow meter, new reverse osmosis membrane backwash non-return valve, the dense water sampling valve of old reverse osmosis membrane, old reverse osmosis membrane fresh water sample valve, the dense water valve of old reverse osmosis membrane, the high purity water gate valve, new reverse osmosis membrane flow of inlet water meter, new reverse osmosis membrane inlet gage, new reverse osmosis membrane water inlet conductivity meter, new reverse osmosis membrane water intaking valve, new reverse osmosis membrane, new reverse osmosis membrane backwash water intaking valve, the new dense water pressure table of reverse osmosis membrane, the new dense water valve of reverse osmosis membrane, new reverse osmosis membrane fresh water conductivity meter, new reverse osmosis membrane fresh-water flow meter, new reverse osmosis membrane fresh water valve, new reverse osmosis membrane bypass valve, the new dense water non-return valve of reverse osmosis membrane, the new dense water sampling valve of reverse osmosis membrane, new reverse osmosis membrane fresh water sample valve, the second candle filter water intaking valve, the second candle filter bypass valve, second candle filter, the second candle filter Pressure gauge, pollution index analyzer (SDI), the SDI sample valve, the concentrated water discharge valve, the fresh water drain valve, the running water drain valve, the acidic cleaning solution drain valve, the alkaline cleaning fluid drain valve, repair the liquid drain valve, old reverse osmosis membrane water inlet pipe, old reverse osmosis membrane concentrate recirculation pipe, old reverse osmosis membrane fresh water return duct, new reverse osmosis membrane water inlet pipe, new reverse osmosis membrane concentrate recirculation pipe, new reverse osmosis membrane fresh water return duct, blow-off pipe, the charcoal filter blow-off pipe, receptacle stand is formed.
Advantage of the present invention is as follows:
1. the present invention has designed the backwash stream of reverse osmosis membrane in system, before carrying out Chemical cleaning, earlier with big flow, wash in advance through the running water of first candle filter loose dirt the reverse osmosis membrane surface, can recover the desalination performance of reverse osmosis membrane to a certain extent, the secondary pollution that pollutant enters in the middle part of the lighter reverse-osmosis membrane element of pollution and tail region causes of film water inlet region clustering be can reduce, the difficulty that reduces the film surface clean, the purpose of saving scavenging period, saving cleaning reagent reached;
2. the present invention gathers the insoluble matter that membrane surface flushing comes out by the pollution index analyzer on the SDI sample valve, can prejudge the composition of insoluble matter or dirt, and then different cleaning steps is taked in decision; Can realize simplifying the operation, using targetedly the purpose of chemical cleaning solution like this;
3. the present invention has designed several special-purpose Chemical cleaning liquid containers and has repaired liquid container in system, make the chemical cleaning solution or the reparation liquid of first use preserve, be used for cleaning next time, the consumption that can save chemical reagent greatly alleviates the carrying capacity of environment of chemical waste discharge;
4. the present invention has designed the closed circuit of cleaning fluid and reparation liquid in system, and filtration by second candle filter, saved chemical reagent on the one hand, can the insoluble matter that clean out in time be filtered on the other hand, prevent that these insoluble matters from entering reverse osmosis membrane once more, make secondary pollution and the film surface abrasion and the destruction of pair of films;
5. the present invention has complete performance monitoring system, the on-line determination instrument that every reverse osmosis membrane assembly is all had independent intake pressure, dense water pressure, water inlet electrical conductivity, fresh water electrical conductivity, flow of inlet water, fresh-water flow, so not only can in time monitor the performance and the state of reverse osmosis membrane, in time adjust cleaning fluid prescription and cleaning process, and can reduce because the DATA REASONING error (for example, the pressure drop that causes by system pipeline) that system pipeline itself causes;
6. the present invention can utilize the needed pure water of equipment of itself production preparation cleaning fluid;
7. the present invention can also provide condition of high voltage, and reverse osmosis membrane performance is done complete mensuration.
The present invention is applicable to that the reverse-osmosis membrane element to the different brands different model carries out Chemical cleaning, reparation and performance measurement; Also reverse osmosis membrane assembly can be replaced with the hyperfiltration membrane assembly of vertical placement, become the chemical cleaning system of a ultrafiltration membrane elements, be used for the off-line pickling and the alkali cleaning of milipore filter.Scientific domain involved in the present invention has multiple subjects such as membrane technology, water treatment technology, Chemical cleaning, chemistry reparation, chemical instruments, is the comprehensive study achievement of cross discipline, has very important use meaning and social value.
Description of drawings
Waste and old Chemical Cleaning for Reverse Osmosis of Fig. 1 and chemical repair system schematic diagram.
(1) running water water intaking valve among the figure, (2) charcoal filter, (3) charcoal filter backwash valve, (4b) first candle filter, (5) filter atmospheric valve, (6a) running water container, (7a) acidic cleaning solution container, (8a) alkaline cleaning fluid container, (9a) repair liquid container, (10) running water concentrate recirculation valve, (11) running water fresh water return valve, (12) running water outlet valve, (13) acidic cleaning solution concentrate recirculation valve, (14) acidic cleaning solution fresh water return valve, (15) acidic cleaning solution outlet valve, (16) alkaline cleaning fluid fresh water return valve, (17) alkaline cleaning fluid concentrate recirculation valve, (18) alkaline cleaning fluid outlet valve, (19) repair liquid fresh water return valve, (20) repair liquid concentrate recirculation valve, (21) repair the liquid outlet valve, (22) pH meter, (23) water inlet conductivity meter, (24) high-pressure pump, (25) pressure-reducing valve, (26) total water intaking valve, (27) old reverse osmosis membrane inlet gage, (28) old reverse osmosis membrane backwash non-return valve, (29) old reverse osmosis membrane flow of inlet water meter, (30) old reverse osmosis membrane water intaking valve, (31) old reverse osmosis membrane, (32) old reverse osmosis membrane bypass valve, (33) old reverse osmosis membrane backwash water intaking valve, (34) the dense water pressure table of old reverse osmosis membrane, (35) old reverse osmosis membrane fresh water valve, (36) old reverse osmosis membrane fresh water conductivity meter, (37) old reverse osmosis membrane fresh-water flow meter, (38) new reverse osmosis membrane backwash non-return valve, the dense water sampling valve of (39) old reverse osmosis membrane, (40) old reverse osmosis membrane fresh water sample valve, (41) the dense water valve of old reverse osmosis membrane, (42) high purity water gate valve, (43) new reverse osmosis membrane flow of inlet water meter, (44) new reverse osmosis membrane inlet gage, (45) new reverse osmosis membrane water inlet conductivity meter, (46) new reverse osmosis membrane water intaking valve, (47) new reverse osmosis membrane, (48) new reverse osmosis membrane backwash water intaking valve, (49) the new dense water pressure table of reverse osmosis membrane, (50) the new dense water valve of reverse osmosis membrane, (51) new reverse osmosis membrane fresh water conductivity meter, (52) new reverse osmosis membrane fresh-water flow meter, (53) new reverse osmosis membrane fresh water valve, (54) new reverse osmosis membrane bypass valve, (55) new dense water non-return valve of reverse osmosis membrane, (56) new dense water sampling valve of reverse osmosis membrane, (57) new reverse osmosis membrane fresh water sample valve, (58) second candle filter water intaking valves, (59) second candle filter bypass valves, (60b) second candle filter, (61) second candle filter Pressure gauges, (62) second candle filter pollution index analyzer (SDI) sample valves, (63) concentrated water discharge valve, (64) fresh water drain valve, (65) running water drain valve, (66) acidic cleaning solution drain valve, (67) alkaline cleaning fluid drain valve, (68) repair the liquid drain valve, (69) old reverse osmosis membrane water inlet pipe, (70) old reverse osmosis membrane concentrate recirculation pipe, (71) old reverse osmosis membrane fresh water return duct, (72) new reverse osmosis membrane water inlet pipe, (73) new reverse osmosis membrane concentrate recirculation pipe, (74) new reverse osmosis membrane fresh water return duct, (75) blow-off pipe, (76) charcoal filter blow-off pipe (77) receptacle stand.
The new reverse osmosis membrane desalination of Fig. 2 embodiment 1 BW30-400 type rate is with pressure history figure.
The new counter-infiltration film water of Fig. 3 embodiment 1 BW30-400 type rate of recovery is with pressure history figure.
Desalination rate and the water rate of recovery change curve of the old reverse osmosis membrane of Fig. 4 embodiment 2 BW30-400 types after the different chemical cleaning step.
The specific embodiment
In conjunction with the accompanying drawings embodiments of the invention are further described:
Embodiment 1.
Utilize method of the present invention and device (see figure 1) that the performance of the new reverse osmosis membrane of BW30-400 is measured.Experimentation is, utilize process charcoal filter (2) and the pretreated running water of first candle filter (4b) (6) as test solution, investigated the variation tendency of water inlet electrical conductivity, fresh water electrical conductivity, flow of inlet water and the fresh-water flow of new reverse osmosis membrane under different intake pressures, the related data that obtains sees Table 1.According to these data, calculate the desalination rate and the water rate of recovery curve (0.13 ~ 1.48MPa) of the new reverse osmosis membrane shown in Fig. 2,3.
Embodiment 2
Present embodiment is the overall process of the waste and old reverse osmosis membrane of BW30-400 type being carried out Chemical cleaning.After carrying out different cleaning steps, use process charcoal filter (2) and the pretreated running water of first candle filter (4b) (6) as test solution respectively, be respectively 1.20 at intake pressure, measured water inlet electrical conductivity, fresh water electrical conductivity, flow of inlet water, fresh-water flow, intake pressure and the dense water pressure of reverse osmosis membrane under the 1.50MPa respectively, obtained experimental data in the table 2,3 and the various change curves of Fig. 4.According to these data, calculate the Specifeca tion speeification after the waste and old reverse osmosis membrane different chemical cleaning step shown in the table 4.
Embodiment 3
Utilize method of the present invention and device that the old reverse osmosis membrane of CPA3-8040 High Pressure Difference has been carried out Chemical cleaning, the results are shown in Table 5.The feature of this film is that initial pressure reduction is too big, is 1.25MPa, and film is blocked, can't measure its initial desalination performance.Through back flush, the stream of film is by open-minded.Subsequently, use acidic cleaning solution that it is cleaned, its pressure reduction drops to 0.17MPa gradually, but its desalination rate and the water rate of recovery are still lower, are respectively 71.9% and 11.4%, so use alkaline cleaning fluid that it is cleaned again.Alkali cleaning is mainly for the organic matter of removing the film surface, colloid, and SiO
2Deng.The desalination rate drops to 69.9% after the alkali cleaning, and the water rate of recovery rises to 19.2%, and pressure reduction drops to 0.15MPa.After, alkaline cleaning fluid alkaline through repeatedly using cleans, use chemical renovation agent that it is carried out chemistry reparation at last, make its desalination rate rise to 87%, the water rate of recovery is 14%, and pressure reduction is 0.15MPa, and this old reverse osmosis membrane is basic near the performance of new film.
Table 6 is the Chemical cleaning situation of the old reverse osmosis membrane of BW30-400 type High Pressure Difference.As can be seen, the desalination rate (96.6%) and the water rate of recovery (17.6%) that this film is initial are all better, but pressure reduction (0.20MPa) bigger than normal.Utilize the present invention to carry out after Chemical cleaning and the chemical repair process, the desalination rate of old film and the water rate of recovery be improved significantly, the mould difference drops to 0.12MPa from 0.20MPa, pressure reduction has descended 40%, its performance is also basic near the performance of new film.
Embodiment 4
Utilize method of the present invention and device that the low old reverse osmosis membrane of water rate of recovery BW30-400 type is carried out Chemical cleaning, the results are shown in Table 7.As can be seen from the table, desalination rate (94.6%) that this film is initial and mould poor (0.13MPa) are all better, but its water rate of recovery (12.6%) and aquifer yield (30.2 m on the low side
3d
-1).Carry out after the multistep Chemical cleaning with the present invention, the desalination rate of old film rises to 98%, and the water rate of recovery rises to 17.8% from 12.6%, and aquifer yield is also from 30.2 m
3d
-1Rise to 43.2 m
3d
-1, pressure reduction also descends to some extent, and its performance is also basic near the performance of new film.
Table 8 is the wash result of the low old film of water rate of recovery BW30-365 type.The initial desalination rate of old film is 95.1%, and pressure reduction is 0.11MPa, and the water rate of recovery is 7.9%, and permeable amount is
18.9m
3d
-1Clearly, the water rate of recovery of old film and permeable amount are too low.Carry out finally making the water rate of recovery of old film rise to 12.6% after the multistep Chemical cleaning with the present invention, risen 4.7%, permeable amount has risen 60%, and its key property is near the performance of new film.
Embodiment 5
Utilize method of the present invention and device that the low old reverse osmosis membrane of desalination rate CPA2-8040 type is carried out Chemical cleaning, the results are shown in Table 9.As can be seen, the initial desalination rate of this film only is 39.3%, and the water rate of recovery is 15.9%, and pressure reduction is 0.15MPa, and its desalination rate is very poor.Carry out after the multistep Chemical cleaning with the present invention, the desalination rate of this film rises to 93.5%, and its key property is near the performance of new film.
Table 10 is the cleaning process and the result of the low old reverse osmosis membrane of desalination rate CPA3-8040 type.As can be seen from the table, the initial desalination rate of film only is 63.8%, and its desalination rate is on the low side.Carry out after the multistep Chemical cleaning with the present invention, the desalination rate of this film is increased to 92.5%, has risen 28.7%, and the water rate of recovery, pressure reduction all return to normal range (NR) substantially, and its key property is near the performance of new film.
Claims (10)
1. a waste and old reverse-osmosis membrane element Chemical cleaning and the chemistry method of repairing, it is characterized in that: the first step, open running water water intaking valve (1), running water (W) is through charcoal filter (2), first candle filter (4b) enters running water container (6a), under the effect of high-pressure pump (24), the running water (6) of running water container (6a) the new reverse osmosis membrane water inlet pipe (72) of flowing through enters new reverse osmosis membrane (47), the fresh water that produces returns acidic cleaning solution container (7a) respectively through new reverse osmosis membrane fresh water return duct (74), alkaline cleaning fluid container (8a) and reparation liquid container (9a), this fresh water is used to prepare various relevant chemical solutions, the dense water that new reverse osmosis membrane (47) produces is through new reverse osmosis membrane concentrate recirculation pipe (73), second candle filter (60b) returns running water container (6a), the system that circulates water; Second step, running water (6) in the running water container (6a) is under the effect of high-pressure pump (24), enter old reverse osmosis membrane (31) from old reverse osmosis membrane concentrate recirculation pipe (70), it is carried out back flush, discharge from concentrated water discharge valve (63) through old reverse osmosis membrane water inlet pipe (69) again; The 3rd step, acidic cleaning solution (7) is under the effect of high-pressure pump (24), flow out from acidic cleaning solution container (7a), enter old reverse osmosis membrane (31) through old reverse osmosis membrane water inlet pipe (69) chemical reaction takes place, the fresh water that produces returns acidic cleaning solution container (7a) through old reverse osmosis membrane fresh water return duct (71), the dense water that produces is through old reverse osmosis membrane concentrate recirculation pipe (70), filter out wherein insoluble matter by second candle filter (60b), return acidic cleaning solution container (7a) then, acidic cleaning solution is recycled; The 4th step, alkaline cleaning fluid (8) is under the effect of high-pressure pump (24), flow out from alkaline cleaning fluid container (8a), enter old reverse osmosis membrane (31) through old reverse osmosis membrane water inlet pipe (69) chemical reaction takes place, the fresh water that produces returns alkaline cleaning fluid container (8a) through old reverse osmosis membrane fresh water return duct (71), the dense water that produces is through old reverse osmosis membrane concentrate recirculation pipe (70), filter out wherein insoluble matter by second candle filter (60b), return alkaline cleaning fluid container (8a) then, alkaline cleaning fluid is recycled; The 5th step, repair liquid (9) under the effect of high-pressure pump (24), flow out from repairing liquid container (9a), enter old reverse osmosis membrane (31) through old reverse osmosis membrane water inlet pipe (69) chemical reaction takes place, the fresh water that produces returns through old reverse osmosis membrane fresh water return duct (71) and repairs liquid container (9a), the dense water that produces returns and repairs liquid container (9a) through old reverse osmosis membrane concentrate recirculation pipe (70), filters out wherein insoluble matter by second candle filter (60b), and reparation liquid is recycled.
2. a waste and old reverse-osmosis membrane element Chemical cleaning and chemical system of repairing is characterized in that: by running water water intaking valve (1), charcoal filter (2), charcoal filter backwash valve (3), first candle filter (4b), filter atmospheric valve (5), running water container (6a), acidic cleaning solution container (7a), alkaline cleaning fluid container (8a), repair liquid container (9a), running water concentrate recirculation valve (10), running water fresh water return valve (11), running water outlet valve (12), acidic cleaning solution concentrate recirculation valve (13), acidic cleaning solution fresh water return valve (14), acidic cleaning solution outlet valve (15), alkaline cleaning fluid fresh water return valve (16), alkaline cleaning fluid concentrate recirculation valve (17), alkaline cleaning fluid outlet valve (18), repair liquid fresh water return valve (19), repair liquid concentrate recirculation valve (20), repair liquid outlet valve (21), pH meter (22), water inlet conductivity meter (23), high-pressure pump (24), pressure-reducing valve (25), total water intaking valve (26), old reverse osmosis membrane inlet gage (27), old reverse osmosis membrane backwash non-return valve (28), old reverse osmosis membrane flow of inlet water meter (29), old reverse osmosis membrane water intaking valve (30), old reverse osmosis membrane (31), old reverse osmosis membrane bypass valve (32), old reverse osmosis membrane backwash water intaking valve (33), the dense water pressure table of old reverse osmosis membrane (34), old reverse osmosis membrane fresh water valve (35), old reverse osmosis membrane fresh water conductivity meter (36), old reverse osmosis membrane fresh-water flow meter (37), new reverse osmosis membrane backwash non-return valve (38), the dense water sampling valve of old reverse osmosis membrane (39), old reverse osmosis membrane fresh water sample valve (40), the dense water valve of old reverse osmosis membrane (41), high purity water gate valve (42), new reverse osmosis membrane flow of inlet water meter (43), new reverse osmosis membrane inlet gage (44), new reverse osmosis membrane water inlet conductivity meter (45), new reverse osmosis membrane water intaking valve (46), new reverse osmosis membrane (47), new reverse osmosis membrane backwash water intaking valve (48), the new dense water pressure table of reverse osmosis membrane (49), the new dense water valve of reverse osmosis membrane (50), new reverse osmosis membrane fresh water conductivity meter (51), new reverse osmosis membrane fresh-water flow meter (52), new reverse osmosis membrane fresh water valve (53), new reverse osmosis membrane bypass valve (54), the new dense water non-return valve of reverse osmosis membrane (55), the new dense water sampling valve of reverse osmosis membrane (56), new reverse osmosis membrane fresh water sample valve (57), the second candle filter water intaking valve (58), the second candle filter bypass valve (59), second candle filter (60b), the second candle filter Pressure gauge (61), pollution index analyzer (SDI) sample valve (62), concentrated water discharge valve (63), fresh water drain valve (64), running water drain valve (65), acidic cleaning solution drain valve (66), alkaline cleaning fluid drain valve (67), repair liquid drain valve (68), old reverse osmosis membrane water inlet pipe (69), old reverse osmosis membrane concentrate recirculation pipe (70), old reverse osmosis membrane fresh water return duct (71), new reverse osmosis membrane water inlet pipe (72), new reverse osmosis membrane concentrate recirculation pipe (73), new reverse osmosis membrane fresh water return duct (74), blow-off pipe (75), charcoal filter blow-off pipe (76), receptacle stand (77) is formed.
3. a kind of waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 1 and chemical method of repairing, it is characterized in that: the intake pressure that obtains this film by old reverse osmosis membrane inlet gage (27), obtain the dense water lateral pressure of this film by the dense water pressure table of old reverse osmosis membrane (34), according to these two force value, obtain the two ends pressure reduction of old reverse osmosis membrane; Obtain into water electrical conductivity by water inlet conductivity meter (23), obtain the fresh water electrical conductivity, obtain the desalination rate of old reverse osmosis membrane according to two Conductivity Calculation by old reverse osmosis membrane fresh water conductivity meter (36); Obtain flow of inlet water by old reverse osmosis membrane flow of inlet water meter (29), obtain fresh-water flow, obtain the water rate of recovery and the water yield per day of old reverse osmosis membrane according to two flow rate calculation by old reverse osmosis membrane fresh-water flow meter (37); Obtain the basic initial performance parameter of old reverse osmosis membrane by described operation.
4. a kind of waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 1 and chemical method of repairing, it is characterized in that: the intake pressure that obtains new reverse osmosis membrane by new reverse osmosis membrane inlet gage (44), obtain the dense water lateral pressure of new reverse osmosis membrane by the dense water pressure table of new reverse osmosis membrane (49), thereby obtain new reverse osmosis membrane two ends pressure reduction; Obtain into water electrical conductivity by new reverse osmosis membrane water inlet conductivity meter (45), obtain the fresh water electrical conductivity, calculate the desalination rate of new reverse osmosis membrane by new reverse osmosis membrane fresh water conductivity meter (51); Obtain flow of inlet water by new reverse osmosis membrane flow of inlet water meter (43), obtain fresh-water flow, calculate the water rate of recovery and the water yield per day of new reverse osmosis membrane by new reverse osmosis membrane fresh-water flow meter (52); Obtain every performance data of new reverse osmosis membrane by described operation, be used for comparing with every performance data of old reverse osmosis membrane.
5. waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 1 and chemical method of repairing, it is characterized in that: wash liquid stream is through reverse osmosis membrane when surface and different dirty class generation chemical reactions, part cleaning fluid passes reverse osmosis membrane surface and forms cleaning fluid fresh water under the effect of pressure, the remainder reverse osmosis membrane surface of flowing through forms the dense water of cleaning fluid that contains dirty class material; When repairing liquid and flowing through the reverse osmosis membrane surface, under the effect of pressure, a part is repaired liquid and is passed the reverse osmosis membrane surface, carries out chemical reaction with the reverse osmosis membrane material, with big fenestra reparation, dwindle, forms and repairs liquid fresh water; Flow through reverse osmosis membrane surface of another part forms and repairs the dense water of liquid, all is back to the reparation liquid container then.
6. waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 1 and chemical method of repairing, it is characterized in that: chemical cleaning solution recycles, the insoluble matter that cleans out is filtered by on-line continuous in cyclic process, realize to save the chemical cleaning solution consumption, reduces the chemical reagent discharging and cause the purpose of environmental pollution; According to the pH meter show value, judge the variation of concentration of lotion, in time replenish and regulate cleaning fluid.
7. waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 1 and chemical method of repairing, it is characterized in that: be provided with old reverse osmosis membrane fresh water sample valve (40), the dense water sampling valve of old reverse osmosis membrane (39), new reverse osmosis membrane fresh water sample valve (57), the new dense water sampling valve of reverse osmosis membrane (56) among the present invention, be used for the off-line sampling and analysing; By the pollution index analyzer on the SDI sample valve (62) that is installed in second candle filter, can obtain the dirt sample and the composition on reverse osmosis membrane surface.
8. waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 2 and chemical system of repairing is characterized in that: can regulate pressure in 0.5 ~ 4.1MPa scope, obtain the continuous delta data of relevant reverse osmosis membrane performance under the different pressures.
9. waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 2 and chemical system of repairing, it is characterized in that: the reverse osmosis membrane assembly in the system can carry out a plurality of parallel connections or series connection as required; Or reverse osmosis membrane assembly is replaced with hyperfiltration membrane assembly, and become the chemical cleaning system of a ultrafiltration membrane elements, be used for the off-line pickling and the alkali cleaning of milipore filter.
10. the system that waste and old reverse-osmosis membrane element Chemical cleaning as claimed in claim 2 and chemistry are repaired is characterized in that: all valves in the system can follow procedure manual operation or operation automatically; Automatically operating process can be controlled by computer or program controller.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103331102A (en) * | 2013-06-21 | 2013-10-02 | 山西太钢不锈钢股份有限公司 | Offline cleaning and evaluating device of reverse osmosis membrane element and application method of device |
| CN104736226A (en) * | 2012-04-15 | 2015-06-24 | 本古里安大学内格夫研究及发展中心 | Effecting high recovery desalination with pressure driven membranes |
| CN104961198A (en) * | 2015-07-10 | 2015-10-07 | 沁园集团股份有限公司 | Reverse osmosis water purifier and de-scaling method for same |
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| US10245556B2 (en) | 2012-04-15 | 2019-04-02 | Ben Gurion University Of The Negev Research And Development Authority | Method and apparatus for effecting high recovery desalination with pressure driven membranes |
| ES2800549A1 (en) * | 2019-06-24 | 2020-12-30 | Consejo Superior Investigacion | INSTALLATION FOR WATER FILTRATION BY REVERSE OSMOSIS AND ULTRAFILTRATION (Machine-translation by Google Translate, not legally binding) |
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| CN104736226A (en) * | 2012-04-15 | 2015-06-24 | 本古里安大学内格夫研究及发展中心 | Effecting high recovery desalination with pressure driven membranes |
| CN104736226B (en) * | 2012-04-15 | 2019-10-08 | 本古里安大学内格夫研究及发展中心 | High-recovery desalination is realized using pressure drive membrane |
| US10245556B2 (en) | 2012-04-15 | 2019-04-02 | Ben Gurion University Of The Negev Research And Development Authority | Method and apparatus for effecting high recovery desalination with pressure driven membranes |
| CN103331102A (en) * | 2013-06-21 | 2013-10-02 | 山西太钢不锈钢股份有限公司 | Offline cleaning and evaluating device of reverse osmosis membrane element and application method of device |
| CN103331102B (en) * | 2013-06-21 | 2015-04-08 | 山西太钢不锈钢股份有限公司 | Offline cleaning and evaluating device of reverse osmosis membrane element and application method of device |
| CN104961198A (en) * | 2015-07-10 | 2015-10-07 | 沁园集团股份有限公司 | Reverse osmosis water purifier and de-scaling method for same |
| CN105536549B (en) * | 2015-12-18 | 2018-04-20 | 无锡德宝水务投资有限公司 | A kind of cleaning method of the fluorine-containing nitrogen-containing wastewater processing reverse osmosis membrane apparatus of electronics industry |
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| CN105664560A (en) * | 2016-04-14 | 2016-06-15 | 济南西斯普换热系统有限公司 | Online folded filter element cleaning machine and cleaning process |
| CN106861442A (en) * | 2017-04-14 | 2017-06-20 | 湖南北控威保特环境科技股份有限公司 | The purging system and cleaning method of a kind of tubular ultrafiltration membrane module |
| CN108854545A (en) * | 2017-05-08 | 2018-11-23 | 上海澄沥环保科技有限公司 | A kind of reverse osmosis nanofiltration system monitoring deviation prompts technology in time |
| ES2800549A1 (en) * | 2019-06-24 | 2020-12-30 | Consejo Superior Investigacion | INSTALLATION FOR WATER FILTRATION BY REVERSE OSMOSIS AND ULTRAFILTRATION (Machine-translation by Google Translate, not legally binding) |
| CN112999881A (en) * | 2021-03-17 | 2021-06-22 | 同济大学 | Method for treating scrapped PVDF (polyvinylidene fluoride) membrane by recycling water |
| CN112999881B (en) * | 2021-03-17 | 2021-11-12 | 同济大学 | Method for treating scrapped PVDF (polyvinylidene fluoride) membrane by recycling water |
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