CN102008737A - Online method for sterilizing and inhibiting bacteria of reverse osmosis membranes - Google Patents
Online method for sterilizing and inhibiting bacteria of reverse osmosis membranes Download PDFInfo
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- CN102008737A CN102008737A CN200910169872XA CN200910169872A CN102008737A CN 102008737 A CN102008737 A CN 102008737A CN 200910169872X A CN200910169872X A CN 200910169872XA CN 200910169872 A CN200910169872 A CN 200910169872A CN 102008737 A CN102008737 A CN 102008737A
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Abstract
The invention discloses an online method for sterilizing and inhibiting bacteria of reverse osmosis membranes, which relates to a method for preventing the reverse osmosis membranes from microbial contamination. The method is characterized by comprising the following steps of: firstly, determining the sterilization cycle of the reverse osmosis membranes; secondly, carrying out the first round of sterilization with a cleaning solution prepared by choosing one non-oxide bactericide; thirdly, carrying out the second round of sterilization with the cleaning solution prepared by choosing another non-oxide bactericide; and fourthly, repeating the second and the third steps. The method makes the impact sterilization cycle of the reverse osmosis membranes clear, can kill microbes before apposition growth on the reverse osmosis membranes massively, improves the sterilization efficiency and effect, guarantees the long-term stable operation of a reverse osmosis system, and prolongs the service life of the reverse osmosis membranes.
Description
Technical field
The present invention relates to control the method that reverse osmosis membrane is subjected to microbial contamination, the online bactericidal method of a kind of specifically reverse osmosis membrane, relate in particular to and adopt membrane technology to carry out in the system of advanced treatment of wastewater reuse, the control reverse osmosis membrane is subjected to the method for microbial contamination.
Background technology
Along with the scarcity day by day of industrial expansion and water resource, greatly develop water reuse cause, become a big subject direction of environmental protection industry development.And greatly develop the reusing sewage cause, and can not only save limited water resource, alleviate outstanding day by day short water supply contradiction, and can reduce sewage emissions, alleviate the pollution of water body on every side, improve the human residential environment, can also save the great lot of water resources expense.
And in the evolution of reusing sewage cause, membrane technology has become the important means of reusing sewage.Reverse osmosis membrane is being obtained great success in extensive sea water, bitter desalination, become the dominant technology in 21 century desalination field.And in the processing of industrial wastewater, same very attractive is because the reuse on the spot of treated water.Reverse osmosis has high removal efficiency to dissolved salt, but removes Organic substance that contains in the chemical substance industrial wastewater etc. with it, still has certain risk.
At present, more existing petrochemical industries adopt reverse osmosis technology that its sewage up to standard is carried out advanced treating and reuse, and from the situation of present operation, the main feature of sewage up to standard is a complicated component, and organism kinds is various and content is higher.Owing to contain abundant Organic substance in the petrochemical industry sewage up to standard, for microbial growth provides nutrition, contamination by micro causes reverse osmosis membrane steady in a long-term to move, and causes the dirt of reverse osmosis membrane stifled easily, comprises the pollution of colloid, inorganic scale, Organic substance and microorganism etc.From the ruuning situation of the present wastewater reusing device reverse osmosis that has moved, microbial contamination is one of subject matter of reverse osmosis stable operation.Therefore overcoming contamination by micro, is one of essential condition that guarantees reverse osmosis stable operation.
In the prior art, all are the cleaning methods when being subjected to the microorganism severe contamination and reaching the Chemical cleaning condition at reverse osmosis membrane.At this moment, microorganism is bred growth in a large number at the reverse osmosis membrane filtration face, and produces biological clay, has formed on the reverse osmosis membrane irreversiblely to adhere to and blocks, and the product water resistance of film increases, and aquifer yield descends, and the rising of filter pressure reduction has increased the difficulty of Chemical cleaning.The clear and definite germ-resistant cycle of the regular impact of reverse osmosis membrane that provides of disclosed document is not arranged as yet, and when adopting the impact sterilization processing at microbiological pollution in the existing open source literature, the medicament that is adopted is many with sodium sulfite NaHSO
3Be main, and NaHSO
3It is bigger to add dose as antibacterial, and efficient is low, and acting surface is narrow, and effect is not ideal enough.
Summary of the invention
At the defective that exists in the prior art, the object of the present invention is to provide the online bactericidal method of a kind of reverse osmosis membrane, the clear and definite germ-resistant cycle of the regular impact of reverse osmosis membrane that provided, microorganism a large amount of apposition growths on reverse osmosis membrane in time can be killed in the past, improve germicidal efficiency and effect, guarantee that counter-infiltration system moves steadily in the long term, prolong the service life of reverse osmosis membrane.
For reaching above purpose, the technical scheme that the present invention takes is:
The online bactericidal method of a kind of reverse osmosis membrane is characterized in that may further comprise the steps:
On the basis of technique scheme, said reusing sewage system comprises sewage reuse system and industrial effluent reusing system in the step 1.
On the basis of technique scheme, in the step 2 selected non-oxidative bactericide for the isothiazolone be main component, the end product quality percentage composition is 1.5% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for dibromo nitrilo propionic acid amide. be main component, the end product quality percentage composition is 99.6% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for the glutaraldehyde be main component, the end product quality percentage composition is 15% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 30-200mg/L.
On the basis of technique scheme, in the step 3 selected non-oxidative bactericide for the isothiazolone be main component, the end product quality percentage composition is 1.5% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for dibromo nitrilo propionic acid amide. be main component, the end product quality percentage composition is 99.6% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for the glutaraldehyde be main component, the end product quality percentage composition is 15% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 30-200mg/L.
On the basis of technique scheme, the concrete steps of said sterilization operation are as follows in the step 2,3:
Steps A. inject
Open the water intaking valve and the concentrated water discharge valve of counter-infiltration system, cleanout fluid is injected in the counter-infiltration system from the feed water by reverse osmosis end, injection pressure is 0.1～0.15MPa, and injecting the cleanout fluid flux is 5～20L/m
2H replaces the water in the reverse osmosis membrane, and emits a part of cleanout fluid from the reverse osmosis concentrated water discharge end;
Step B. circulation
Under 0.3～0.5MPa pressure, make cleanout fluid at the counter-infiltration system internal recycle, circulating path is: clean water tank-feed water by reverse osmosis end-reverse osmosis membrane filtration side-reverse osmosis concentrated water discharge end-cleaning water tank, the circulation flux is 10～30L/m
2H, circulation time are 10～30min, and guaranteeing to produce the water side does not have penetrating fluid;
Step C. soaks
Stop circulation, close the concentrated water discharge valve and the water intaking valve of counter-infiltration system, make reverse osmosis membrane be cleaned liquid and soak, soak time is 30～60min;
Step D. recirculation
Open the water intaking valve and the concentrated water discharge valve of counter-infiltration system once more, under 0.3～0.5MPa pressure, make cleanout fluid at the counter-infiltration system internal recycle, circulating path is: clean water tank-feed water by reverse osmosis end-reverse osmosis membrane filtration side-reverse osmosis concentrated water discharge end-cleaning water tank, the circulation flux is 10～30L/m
2H, circulation time are 10～30min, and guaranteeing to produce the water side does not have penetrating fluid;
Saidly in the step 2,3 comprise following concrete steps with reverse osmosis produced water flushing reverse osmosis membrane:
Step e. flushing
From feed water by reverse osmosis end flushing reverse osmosis membrane, flushing pressure is 0.3～0.5MPa with reverse osmosis produced water, and the flushing flux is 10～30L/m
2H, washing time is 10～20min, guarantees that the pH value of the water of discharging from the reverse osmosis concentrated water discharge end and electrical conductivity and reverse osmosis produced water are approaching, the pH value of reverse osmosis produced water is 5-6, reverse osmosis produced electrical conductivity of water＜100 μ s/cm.
Beneficial effect of the present invention:
From present industrial ruuning situation, reverse osmosis membrane in the reusing sewage system is subjected to microbial contamination commonplace, the present invention can reduce present reverse osmosis membrane and be used in the probability that existing microbiological pollution takes place in the advanced treatment of wastewater reuse, overcome reverse osmosis membrane because microbial contamination reaches the Chemical cleaning condition, even when causing irreversible pollution, clean the difficulty that is produced when recovering reverse osmosis membrane performance, as security personnel's filter is installed before the reverse osmosis membrane in the system, can prolong the replacing frequency of security personnel's filter greatly, reduce operating cost.
Therefore, the invention provides a kind of decision method of reverse osmosis membrane sterilization cycle,, provide a kind of online bactericidal control method simultaneously according to the sterilization cycle of being judged.According to the bacterium culture test of reverse osmosis concentrated water, draw growth curve of bacteria, determine that its increased logarithmic phase is the online impact type sterilization cycle of reverse osmosis membrane.In order to prevent that antibacterial from developing immunity to drugs,, adopt two or more non-oxidative bactericides that reverse osmosis membrane is replaced sterilization according to the determined sterilization cycle in front.Under this kind process condition, both can improve the cycle of operation of reverse osmosis membrane, avoid the reverse osmosis membrane severe contamination to reach the Chemical cleaning condition, increase and clean difficulty, even cause irreversible pollution, and prolong the service life of reverse osmosis membrane, can avoid the preceding security personnel of reverse osmosis filter to be subjected to microbial contamination again, prolong the replacing frequency of filter element greatly, reduce operating cost.
Description of drawings
Fig. 1 is the increased logarithmic phase sketch map of bacterium culture test.
Fig. 2 is the sketch map of bactericidal control method of the present invention.
Fig. 3 is the growth curve of bacteria figure of embodiment 1.
Fig. 4 is the growth curve of bacteria figure of embodiment 2.
The specific embodiment
The invention discloses the online bactericidal method of a kind of reverse osmosis membrane, may further comprise the steps:
On the basis of technique scheme, said reusing sewage system comprises sewage reuse system and industrial effluent reusing system in the step 1.
On the basis of technique scheme, in the step 2 selected non-oxidative bactericide for the isothiazolone be main component, the end product quality percentage composition is 1.5% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L; For example: concentration of lotion can be 50mg/L, 55mg/L, 60mg/L, 65mg/L, 70mg/L, 75mg/L, 80mg/L, 85mg/L, 90mg/L, 95mg/L, 100mg/L, 110mg/L, 120mg/L, 130mg/L, 140mg/L, 150mg/L, 160mg/L, 170mg/L, 180mg/L, 190mg/L, 200mg/L, 210mg/L, 220mg/L, 230mg/L, 240mg/L, 250mg/L, 260mg/L, 270mg/L, 280mg/L, 290mg/L or 300mg/L;
Or for dibromo nitrilo propionic acid amide. be main component, the end product quality percentage composition is 99.6% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L; For example: concentration of lotion can be 50mg/L, 55mg/L, 60mg/L, 65mg/L, 70mg/L, 75mg/L, 80mg/L, 85mg/L, 90mg/L, 95mg/L, 100mg/L, 110mg/L, 120mg/L, 130mg/L, 140mg/L, 150mg/L, 160mg/L, 170mg/L, 180mg/L, 190mg/L, 200mg/L, 210mg/L, 220mg/L, 230mg/L, 240mg/L, 250mg/L, 260mg/L, 270mg/L, 280mg/L, 290mg/L or 300mg/L;
Or for the glutaraldehyde be main component, the end product quality percentage composition is 15% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 30-200mg/L.For example: concentration of lotion can be 30mg/L, 35mg/L, 40mg/L, 45mg/L, 50mg/L, 55mg/L, 60mg/L, 65mg/L, 70mg/L, 75mg/L, 80mg/L, 85mg/L, 90mg/L, 95mg/L, 100mg/L, 110mg/L, 120mg/L, 130mg/L, 140mg/L, 150mg/L, 160mg/L, 170mg/L, 180mg/L, 190mg/L or 200mg/L;
On the basis of technique scheme, in the step 3 selected non-oxidative bactericide for the isothiazolone be main component, the end product quality percentage composition is 1.5% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for dibromo nitrilo propionic acid amide. be main component, the end product quality percentage composition is 99.6% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for the glutaraldehyde be main component, the end product quality percentage composition is 15% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 30-200mg/L.
On the basis of technique scheme, the concrete steps of said sterilization operation are as follows in the step 2,3:
Steps A. inject
Open the water intaking valve and the concentrated water discharge valve of counter-infiltration system, cleanout fluid is injected in the counter-infiltration system from the feed water by reverse osmosis end, injection pressure is 0.1～0.15MPa, and injecting the cleanout fluid flux is 5～20L/m
2H replaces the water in the reverse osmosis membrane, and emits a part of cleanout fluid from the reverse osmosis concentrated water discharge end; For example: injection pressure can be 0.10MPa, 0.11MPa, 0.12MPa, 0.13MPa, 0.14MPa or 0.15MPa; Inject the cleanout fluid flux and can be 5L/m
2H, 6L/m
2H, 7L/m
2H, 8L/m
2H, 9L/m
2H, 10L/m
2H, 11L/m
2H, 12L/m
2H, 13L/m
2H, 14L/m
2H, 15L/m
2H, 16L/m
2H, 17L/m
2H, 18L/m
2H, 19L/m
2H or 20L/m
2H;
Step B. circulation
Under 0.3～0.5MPa pressure, make cleanout fluid at the counter-infiltration system internal recycle, circulating path is: clean water tank-feed water by reverse osmosis end-reverse osmosis membrane filtration side-reverse osmosis concentrated water discharge end-cleaning water tank, the circulation flux is 10～30L/m
2H, circulation time are 10～30min, and guaranteeing to produce the water side does not have penetrating fluid; For example: pressure can be 0.3MPa, 0.32MPa, 0.34MPa, 0.36MPa, 0.38MPa, 0.4MPa, 0.42MPa, 0.44MPa, 0.46MPa, 0.48MPa or 0.5MPa; The circulation flux can be 10L/m
2H, 11L/m
2H, 12L/m
2H, 13L/m
2H, 14L/m
2H, 15L/m
2H, 16L/m
2H, 17L/m
2H, 18L/m
2H, 19L/m
2H, 20L/m
2H, 21L/m
2H, 22L/m
2H, 23L/m
2H, 24L/m
2H, 25L/m
2H, 26L/m
2H, 27L/m
2H, 28L/m
2H, 29L/m
2H or 30L/m
2H; Circulation time can be 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min, 20min, 21min, 22min, 23min, 24min, 25min, 26min, 27min, 28min, 29min or 30min;
Step C. soaks
Stop circulation, close the concentrated water discharge valve and the water intaking valve of counter-infiltration system, make reverse osmosis membrane be cleaned liquid and soak, soak time is 30～60min; For example: soak time can be 30min, 35min, 40min, 45min, 50min, 55min or 60min;
Step D. recirculation
Open the water intaking valve and the concentrated water discharge valve of counter-infiltration system once more, under 0.3～0.5MPa pressure, make cleanout fluid at the counter-infiltration system internal recycle, circulating path is: clean water tank-feed water by reverse osmosis end-reverse osmosis membrane filtration side-reverse osmosis concentrated water discharge end-cleaning water tank, the circulation flux is 10～30L/m
2H, circulation time are 10～30min, and guaranteeing to produce the water side does not have penetrating fluid;
Said sterilization back comprises following concrete steps with reverse osmosis produced water flushing reverse osmosis membrane in the step 2,3:
Step e. flushing
From feed water by reverse osmosis end flushing reverse osmosis membrane, flushing pressure is 0.3～0.5MPa with reverse osmosis produced water, and the flushing flux is 10～30L/m
2H, washing time is 10～20min, guarantees that the pH value of the water of discharging from the reverse osmosis concentrated water discharge end and electrical conductivity and reverse osmosis produced water are approaching, the pH value of reverse osmosis produced water is 5-6, reverse osmosis produced electrical conductivity of water＜100 μ s/cm.For example: flushing pressure can be 0.3MPa, 0.32MPa, 0.34MPa, 0.36MPa, 0.38MPa, 0.4MPa, 0.42MPa, 0.44MPa, 0.46MPa, 0.48MPa or 0.5MPa; The flushing flux can be 10L/m
2H, 11L/m
2H, 12L/m
2H, 13L/m
2H, 14L/m
2H, 15L/m
2H, 16L/m
2H, 17L/m
2H, 18L/m
2H, 19L/m
2H, 20L/m
2H, 21L/m
2H, 22L/m
2H, 23L/m
2H, 24L/m
2H, 25L/m
2H, 26L/m
2H, 27L/m
2H, 28L/m
2H, 29L/m
2H or 30L/m
2H; Washing time can be 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min or 20min.
The flow process of the method for the invention can be as shown in Figure 2, influent side at counter-infiltration system 1 is provided with security personnel's filter 4, part reverse osmosis produced water 6 enters and cleans water tank 2, after cleaning the reverse osmosis produced water process flushing water pump (water circulating pump) 3 in the water tank 2, enter pipeline from the influent side of security personnel's filter 4, counter-infiltration system 1 and 2 in water tank of cleaning are provided with one road pipeline, and are provided with dense water sampling mouth (floss hole) 5 on this pipeline, and dotted line is a wash cycles route 7 among the figure.Valve among Fig. 2 can adopt existing techniques in realizing.
The method of the invention with reverse osmosis concentrated water as cultivating the water source culture of bacteria, then with the sterilization cycle of antibacterial increased logarithmic phase as reverse osmosis, two kinds of different germ-resistant modes of non-oxidative bactericide alternately impinge formula of periodic employing are carried out online bactericidal control to reverse osmosis.Adopt the method can reduce present counter-infiltration system and be used in existing microbiological pollution in the advanced treatment of wastewater reuse, overcome counter-infiltration system because microbial contamination reaches the Chemical cleaning condition, even when causing irreversible pollution, clean the difficulty that is produced when recovering the reverse osmosis performance, guarantee that counter-infiltration system moves steadily in the long term, prolong the service life of reverse osmosis membrane.As security personnel's filter is installed before reverse osmosis membrane in the system, can also prolong the replacing frequency of security personnel's filter greatly, reduce operating cost.
There is certain risk in application of membrane in the middle of the advanced treatment of wastewater reuse.From the ruuning situation of the present wastewater reusing device counter-infiltration system that has moved, microbial contamination is the subject matter of counter-infiltration system stable operation.And present existing technology all is the cleaning methods when being subjected to the microorganism severe contamination and reaching the Chemical cleaning condition at reverse osmosis membrane.At this moment, microorganism is bred growth in a large number at the reverse osmosis membrane filtration face, and produces biological clay, formed on the reverse osmosis membrane and irreversiblely adhered to and block, the product water resistance of reverse osmosis membrane increases, and aquifer yield descends, filter pressure reduction raises, and has increased the difficulty of Chemical cleaning.The present invention has not only provided the decision method of reverse osmosis membrane sterilization cycle, and according to the sterilization cycle of being judged, provides a kind of online bactericidal control method simultaneously.Overcome reverse osmosis membrane and be subjected to the drawback that is difficult to clean behind the microorganism severe contamination, before on the membrane filtration face taking place the initial quick growth and breeding of the adhesion stage, just it has been killed, prevented the microorganisms biological clay, the serious dirty reverse osmosis membrane that blocks up in microorganism.
Below further specify the method for the invention by specific embodiment.
The oil refining factory effluent of certain factory after secondary biochemical treatment, its advanced treatment recycling technique flow process is: pretreatment-super filtering-reverse osmosis, the design amount of inlet water of reverse osmosis is 200m
3/ h.Its, reverse osmosis concentrated water water quality situation was as follows in summer: COD is that 190mg/L, TOC are that 62.8mg/L, bacterial content are 1100cfu/ml, and temperature is 40 ℃.
Get reverse osmosis concentrated water as cultivating the water source from sample tap, setting cultivation temperature is 40 ℃, and measuring frequency is that every 4-8h surveys once, and setting incubation time is 6 days.Obtain under 40 ℃ growth curve of bacteria as shown in Figure 3.
Can determine that from Fig. 3 the increased logarithmic phase of antibacterial is 72-100h, be roughly equal to 3-4 days.Determine that summer, the impact type sterilization cycle was 3 days.The alternate cycle that two-wheeled cleans was 4 next cycles.
The first round cleans and selects isothiazolone (1.5%) for use is antibacterial, and the concentration of lotion of preparation is 150mg/L, and alternate cycle was 4 next cycles.Cleanout fluid injects in the counter-infiltration system from the feed water by reverse osmosis end, and injection pressure is 0.12MPa, and injecting the cleanout fluid flux is 9L/m
2H (is that flow is 100m
3/ h), replace after the water in the reverse osmosis membrane, and discharge a part of cleanout fluid from the reverse osmosis concentrated water discharge end.Under the pressure of 0.4MPa, the circulation flux is 18L/m
2H (is that flow is 200m
3Under/h) the condition, circulation 10min.Back immersion 40min stops to circulate.Under the pressure of 0.4MPa, the circulation flux is 18L/m
2H (is that flow is 200m
3/ h), recirculation 10min.Wash reverse osmosis membrane with reverse osmosis produced water, flushing pressure is 0.3MPa, and the flushing flux is 18L/m
2H (is that flow is 200m
3/ h), washing time is 10min.The pH of flushing discharge water is 6.2, and electrical conductivity is about 60 μ s/cm.
Through 4 impact type sterilizations (first round sterilization), after promptly 12 days, enter second and take turns cleaning.
Second takes turns and cleans that to select dibromo nitrilo propionic acid amide. (99.6%) for use be antibacterial, and the concentration of lotion of preparation is 100mg/L, and alternate cycle was 4 next cycles.Cleanout fluid injects in the counter-infiltration system from the feed water by reverse osmosis end, and injection pressure is 0.12MPa, and injecting the cleanout fluid flux is 9L/m
2H (is that flow is 100m
3/ h), after the water in the displacement membrane component, and discharge a part of cleanout fluid.Under the pressure of 0.4MPa, the circulation flux is 18L/m
2H (is that flow is 200m
3Under/h) the condition, circulation 10min, 40min, recirculation 10min are soaked in the back that stops to circulate.Wash reverse osmosis membrane with reverse osmosis produced water, flushing pressure is 0.4MPa, and the flushing flux is 18L/m
2H (is that flow is 200m
3/ h), washing time is 10min.The pH of flushing discharge water is 6.3, and electrical conductivity is about 64 μ s/cm.
According to this in proper order, the impact type sterilization operation that the first round and second of hocketing takes turns.
Under this kind impact type sterilization conditions, counter-infiltration system can steady in a long-termly move more than 2 months, and security personnel's filter element replacement cycle is about 6 months.
Reusing sewage system among the embodiment 1, its, reverse osmosis concentrated water water quality situation was in winter: COD is that 210mg/L, TOC are that 70mg/L, bacterial content are 150cfu/m, and temperature is 25 ℃.
Get reverse osmosis concentrated water as cultivating the water source from sample tap, setting cultivation temperature is 25 ℃, and measuring frequency is 1 time/4-12h, and setting incubation time is 12 days.Growth curve of bacteria under 25 ℃ as shown in Figure 4.
Can determine that from Fig. 4 the increased logarithmic phase of antibacterial is 170-210h, be roughly equal to 7-9 days.Determine that winter, the impact type sterilization cycle was 7 days.
The first round cleans and selects isothiazolone (1.5%) for use is antibacterial, and the concentration of lotion of preparation is 150mg/L, and alternate cycle was 2 next cycles.With the flux is 9L/m
2H, promptly flow is 100m
3/ h injects cleanout fluid, after the water in the displacement membrane component, and discharges a part of cleanout fluid.Under the pressure of 0.4MPa, the circulation flux is 18L/m
2H, promptly flow is 200m
3Under the condition of/h, circulation 10min, 40min, recirculation 10min are soaked in the back that stops to circulate.Utilize reverse osmosis produced water flushing reverse osmosis membrane, the flushing flux is 18L/m
2H, promptly flow is 200m
3/ h, washing time are 10min.The pH of flushing discharge water is 6.1, and electrical conductivity is about 61 μ s/cm.
Through 2 impact type sterilizations, promptly 14 days, enter second and take turns cleaning.Selecting dibromo nitrilo propionic acid amide. (99.6%) for use is antibacterial, and the concentration of lotion of preparation is 100mg/L, and alternate cycle was 4 next cycles.With the flux is 9L/m
2H, promptly flow is 100m
3/ h injects cleanout fluid, after the water in the displacement membrane component, and discharges a part of cleanout fluid.Under the pressure of 0.4MPa, the circulation flux is 18L/m
2H, promptly flow is 200m
3Under the condition of/h, circulation 10min, 40min, recirculation 10min are soaked in the back that stops to circulate.Utilize reverse osmosis produced water flushing reverse osmosis membrane, the flushing flux is 18L/m
2H, promptly flow is 200m
3/ h, washing time are 10min.The pH of flushing discharge water is 6.2, and electrical conductivity is about 60 μ s/cm.
According to this in proper order, the impact type sterilization operation that the first round and second of hocketing takes turns.
Under this kind impact type sterilization conditions, reverse osmosis can steady in a long-termly move more than 3 months, and security personnel's filter element replacement cycle is about 6 months.
Comparative Examples 1
In embodiment 1, do not adopt the germ-resistant technology of impact type, security personnel's filter element needed change once in 3 days in summer before the reverse osmosis, and the reverse osmosis cycle of operation is about 1 month.Judge that according to cleaning performance reverse osmosis is subjected to microbial contamination more serious.
From the actual motion effect, the pollution cycle of security personnel's filter matches with determined sterilization cycle in the bacterium culture test.
Comparative Examples 2
In embodiment 2, do not adopt the germ-resistant technology of impact type, security personnel's filter element needed change once in the winter time in 10 days before the reverse osmosis, and the reverse osmosis cycle of operation is about 1.5 months.Judge that according to cleaning performance reverse osmosis is subjected to microbial contamination more serious.
From the actual motion effect, the pollution cycle of security personnel's filter matches with determined sterilization cycle in the bacterium culture test.
Claims (5)
1. online bactericidal method of reverse osmosis membrane is characterized in that may further comprise the steps:
Step 1, determine the sterilization cycle of reverse osmosis membrane: with the reverse osmosis concentrated water in the reusing sewage system as cultivating the water source culture of bacteria, the antibacterial culturing temperature is 15～40 ℃, or according to the actual motion temperature setting of reusing sewage system, incubation time is 2～15 days, adopt the Standard Plate Count method to measure total number of bacteria, obtain growth curve of bacteria after, with the sterilization cycle of pairing time of increased logarithmic phase in the growth curve of bacteria as reverse osmosis membrane;
Step 2, select for use a kind of non-oxidative bactericide to be configured to carry out first round sterilization behind the cleanout fluid: with the definite sterilization cycle of step 1, reverse osmosis membrane in the counter-infiltration system is carried out sterilization operation 1～10 time, each sterilization operation includes injection, circulation, immersion, four steps of recirculation, and reverse osmosis membrane is washed with reverse osmosis produced water in the sterilization back;
Step 3, select for use the non-oxidative bactericide different to be configured to carry out second behind the cleanout fluid and take turns sterilization: the sterilization cycle of determining with step 1 with first round sterilization, reverse osmosis membrane in the counter-infiltration system is carried out sterilization operation 1～10 time, each sterilization operation includes injection, circulation, immersion, four steps of recirculation, and reverse osmosis membrane is washed with reverse osmosis produced water in the sterilization back;
Step 4, repeating step 2,3.
2. the online bactericidal method of reverse osmosis membrane as claimed in claim 1 is characterized in that: said reusing sewage system comprises sewage reuse system and industrial effluent reusing system in the step 1.
3. the online bactericidal method of reverse osmosis membrane as claimed in claim 1, it is characterized in that: in the step 2 selected non-oxidative bactericide for the isothiazolone be main component, the end product quality percentage composition is 1.5% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for dibromo nitrilo propionic acid amide. be main component, the end product quality percentage composition is 99.6% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for the glutaraldehyde be main component, the end product quality percentage composition is 15% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 30-200mg/L.
4. the online bactericidal method of reverse osmosis membrane as claimed in claim 1, it is characterized in that: in the step 3 selected non-oxidative bactericide for the isothiazolone be main component, the end product quality percentage composition is 1.5% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for dibromo nitrilo propionic acid amide. be main component, the end product quality percentage composition is 99.6% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 50-300mg/L;
Or for the glutaraldehyde be main component, the end product quality percentage composition is 15% antibacterial, and itself and reverse osmosis produced water or fresh water are mixedly configured into the cleanout fluid that concentration is 30-200mg/L.
5. the online bactericidal method of reverse osmosis membrane as claimed in claim 1, it is characterized in that: the concrete steps of said sterilization operation are as follows in the step 2,3:
Steps A. inject
Open the water intaking valve and the concentrated water discharge valve of counter-infiltration system, cleanout fluid is injected in the counter-infiltration system from the feed water by reverse osmosis end, injection pressure is 0.1～0.15MPa, and injecting the cleanout fluid flux is 5～20L/m
2H replaces the water in the reverse osmosis membrane, and emits a part of cleanout fluid from the reverse osmosis concentrated water discharge end;
Step B. circulation
Under 0.3～0.5MPa pressure, make cleanout fluid at the counter-infiltration system internal recycle, circulating path is: clean water tank-feed water by reverse osmosis end-reverse osmosis membrane filtration side-reverse osmosis concentrated water discharge end-cleaning water tank, the circulation flux is 10～30L/m
2H, circulation time are 10～30min, and guaranteeing to produce the water side does not have penetrating fluid;
Step C. soaks
Stop circulation, close the concentrated water discharge valve and the water intaking valve of counter-infiltration system, make reverse osmosis membrane be cleaned liquid and soak, soak time is 30～60min;
Step D. recirculation
Open the water intaking valve and the concentrated water discharge valve of counter-infiltration system once more, under 0.3～0.5MPa pressure, make cleanout fluid at the counter-infiltration system internal recycle, circulating path is: clean water tank-feed water by reverse osmosis end-reverse osmosis membrane filtration side-reverse osmosis concentrated water discharge end-cleaning water tank, the circulation flux is 10～30L/m
2H, circulation time are 10～30min, and guaranteeing to produce the water side does not have penetrating fluid;
Saidly in the step 2,3 comprise following concrete steps with reverse osmosis produced water flushing reverse osmosis membrane:
Step e. flushing
From feed water by reverse osmosis end flushing reverse osmosis membrane, flushing pressure is 0.3～0.5MPa with reverse osmosis produced water, and the flushing flux is 10～30L/m
2H, washing time is 10～20min, guarantees that the pH value of the water of discharging from the reverse osmosis concentrated water discharge end and electrical conductivity and reverse osmosis produced water are approaching, the pH value of reverse osmosis produced water is 5-6, reverse osmosis produced electrical conductivity of water＜100 μ s/cm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107244714A (en) * | 2017-08-15 | 2017-10-13 | 吴腾飞 | A kind of water-purifying device |
| CN112066527A (en) * | 2020-09-15 | 2020-12-11 | Tcl空调器(中山)有限公司 | Humidifier, water quantity judging method thereof, control system and storage medium |
| CN114538659A (en) * | 2022-02-28 | 2022-05-27 | 深圳市中电加美电力技术有限公司 | Circulating water quality control treatment method and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100581641C (en) * | 2006-03-20 | 2010-01-20 | 天津化工研究设计院 | Bactericide for reverse osmosis membrane and method for preparing the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107244714A (en) * | 2017-08-15 | 2017-10-13 | 吴腾飞 | A kind of water-purifying device |
| CN107244714B (en) * | 2017-08-15 | 2021-09-24 | 淮北醴恒净水科技有限公司 | Water purifier device |
| CN112066527A (en) * | 2020-09-15 | 2020-12-11 | Tcl空调器(中山)有限公司 | Humidifier, water quantity judging method thereof, control system and storage medium |
| CN112066527B (en) * | 2020-09-15 | 2022-01-04 | Tcl空调器(中山)有限公司 | Humidifier, water quantity judging method thereof, control system and storage medium |
| CN114538659A (en) * | 2022-02-28 | 2022-05-27 | 深圳市中电加美电力技术有限公司 | Circulating water quality control treatment method and system |
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