CN102773022A - Cross-flow ultrafiltration membrane backwashing method - Google Patents
Cross-flow ultrafiltration membrane backwashing method Download PDFInfo
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- CN102773022A CN102773022A CN2012102677455A CN201210267745A CN102773022A CN 102773022 A CN102773022 A CN 102773022A CN 2012102677455 A CN2012102677455 A CN 2012102677455A CN 201210267745 A CN201210267745 A CN 201210267745A CN 102773022 A CN102773022 A CN 102773022A
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Abstract
The invention relates to a cross-flow ultrafiltration membrane backwashing method and belongs to the field of water treatment. On the basis that single sodium hypochlorite-added enhanced backwashing is adopted to serve as a cross-flow ultrafiltration membrane backwashing mode, based on the characteristics that an ultrafiltration membrane device is high in oxidation resistance and is capable of resisting acid and base in material, the single sodium hypochlorite-added enhanced backwashing is aided with hydrochloric acid and sodium hydroxide-added chemical enhanced backwashing, i.e. an ultrafiltration membrane enhanced backwashing mode is hydrochloric acid-added backwashing aided with sodium hypochlorite and sodium hypochlorite-added enhanced backwashing. The effluent quality and the membrane flux are ensured during the operation period of a membrane system, so that transmembrane pressure is kept within a smaller range. Meanwhile, the energy consumption is also reduced, and the ultrafiltration membrane device can stably, economically and safely run for a long term.
Description
Technical field
The invention belongs to water treatment field.
Background technology
Milipore filter is widely used in the former water pretreatment system in fields such as desalinization, thermoelectricity, nuclear power, medicine, oil, chemical industry, and membrane technology shows its social benefit and economic benefit day and gives prominence to as a kind of advanced person, economic water technology.It is the most important performance recovery mode of milipore filter that backwash is strengthened in ultrafiltration, and can its selection of strengthening the backwash mode steady in a long-termly move most important to milipore filter.And the most widely used cross-current type milipore filter; It is strengthened, and backwash mode is normal to adopt the single clorox that adds to strengthen backwash, this reinforcement backwash mode help removing microorganism in the deposition on film surface, grow, but can not remove glutinous mud, dirt type the deposition in the water inlet on the film surface; Especially when water inlet adopts flocculant to handle; Add the improper flocculant that will cause of dose adjustment at the film surface deposition, the membrane flux of the deposition reduction system greatly operation of glutinous mud, dirt type, flocculant, cause that transmembrane pressure rises, energy consumption rises, when serious; The film silk blocks fully, causes ultrafiltration apparatus to move.Though dispose the chemical cleaning system of regular use, when film surface deposition amount acquired a certain degree, the normal water flux of film still can't recover in system after the Chemical cleaning.
Usually; Cross-current type milipore filter intake pressure maximum is 400～500 kPa; Normal intake pressure is 30～80kPa, and maximum transmembrane pressure is 200kPa, between the normal transmembrane pressure between 30～60kPa; When the ultrafiltration operation system water cycle reaches setting value or intake pressure increases by 30% or more or transmembrane pressure reaches 80～100kPa or keep intake pressure and produce discharge when constant when descending 15% (deduction temperature effect), all should adopt chemistry reinforcement backwash CEB.The conventional backwash CEB that strengthens of cross-current type milipore filter all adopts the backwash of several system water week after date adding clorox, and the ultrafiltration step is:
First makes the water cycle first step: ultrafiltration exhaust full water, and open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
First second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 30 minutes time;
First the 3rd step of system water cycle: hyperfiltration reverse-rinsing, open backwash water intaking valve, backwash draining valve, 1 minute time;
As above same procedure is carried out second system water cycle, the 3rd system water cycle, the 4th system water cycle and the 5th system water cycle;
The 6th the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
The 6th second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 30 minutes time;
The 6th the 3rd step of system water cycle: backwash is strengthened in ultrafiltration, opens backwash water intaking valve, backwash draining valve, advances hypochlorous acid sodium valves, clorox dosing pump, and clorox adds dose 50～100mg/L in the backwash water, 2 minutes time;
Reach the 6th all after date and get into first system water cycle automatically, circulation.
But aforesaid operations can not effectively be removed deposits such as the glutinous mud on the milipore filter, dirty class.
Summary of the invention
The present invention provides a kind of cross-current type milipore filter back-washing method, with solve exist in the present cross-current type milipore filter back-washing method can not effectively remove sedimental problems such as glutinous mud on the milipore filter, dirt class.
The technical scheme that the present invention takes is to comprise the following steps:
First makes the water cycle first step: ultrafiltration exhaust full water, and open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
First second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45～50 minutes time;
First the 3rd step of system water cycle: hyperfiltration reverse-rinsing, open backwash water intaking valve, backwash draining valve, 1 minute time;
As above same procedure is carried out second system water cycle, the 3rd system water cycle, the 4th system water cycle and the 5th system water cycle;
The 6th the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
The 6th second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45～50 minutes time;
The 6th step in system water cycle the 3rd: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, and hydrochloric acid adds dose 50～100mg/L or pH value 1.8 ~ 2.2 in the backwash water, 2～3 minutes time;
The 6th the 4th step of system water cycle: ultrafiltration adds soak, closes all valves, soak time 10～15 minutes;
The 6th the 5th step of system water cycle: ultrafiltration adds the flushing of sour backwash, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2～3 minutes;
11 system water cycles of the 7th system water cycle to the are identical with five system water cycles of first system water cycle to the as above;
The 12 the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
The 12 second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45～50 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 50～100mg/L, NaOH and adds dose 50～100mg/L or pH value 9.8 ~ 10.2,2～3 minutes time in the backwash water;
The 12 the 4th step of system water cycle: backwash is strengthened in ultrafiltration, and close all valves and soak, soak time 10～15 minutes,
The 12 the 5th step of system water cycle: the flushing of backwash is strengthened in ultrafiltration, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2～3 minutes;
Reach the 12 system water week after date and get into first system water cycle automatically, circulation.
The present invention strengthens the backwash mode at the cross-current type milipore filter and all adopts the single clorox that adds to strengthen on the basis of backwash; It is strong to have oxidation resistance based on milipore filter device material; Can resist the characteristics of soda acid; The chemistry that is aided with hydrochloric acid, NaOH is strengthened backwash, i.e. ultrafiltration strengthens the backwash mode for adding the hydrochloric acid backwash, adding clorox and NaOH reinforcement backwash.
Advantage of the present invention:
Though " cross-current type " ultrafiltration is with respect to " dead-end filtration " ultrafiltration; It is serious dirty stifled to be difficult for producing the film surface; But receive the influence that the water source changes, adds factors such as dose adjustment, water temperature variation during actual motion, " cross-current type " ultrafiltration is after certain cycle of operation, and film surface still ubiquity the dirty stifled phenomenon of serious deposition; The present invention not only help removing microorganism in the deposition on film surface, grow; Also remove the glutinous mud in the water inlet, dirty class, flocculant effectively in the surperficial deposition of film, rely on hydrochloric acid that inorganic scale class, NaOH are added efficiently the remove ability of clorox to organic deposition class, microorganism, bacterium, guaranteed the effluent quality and the membrane flux of film system run duration; Transmembrane pressure is maintained in the small range; Simultaneously also reduce energy consumption, guaranteed ultrafiltration apparatus operation steady in a long-term, economic, safe, avoided the influent quality of subordinate's water treatment facilities.
On existing equipment and system-based, improvement expenses is very low, and it is little to transform difficulty; Whole operation adopts Automatic Control, owing to consider clorox and NaOH compatibility, chemical reaction does not take place simultaneously; When therefore adding clorox hydro-oxidation sodium, adopt a pipeline.
In addition; Backwash drain time, soak time, washing time through revising in " adding the hydrochloric acid backwash cycle ", " adding clorox+NaOH backwash cycle " and the every kind of dosing backwash all can be changed, and help through the time strengthening when adjustment guarantees that different quality is adopted in water inlet the effect of backwash.Simultaneously, the discharging of hydrochloric acid, NaOH can not change pH value of waste water in the running.
Simultaneously, can add protective drug through the soda acid storage bin regularly protects ultrafiltration apparatus.
The specific embodiment
Embodiment 1
First makes the water cycle first step: ultrafiltration exhaust full water, and open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2 minutes time;
First second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45 minutes time;
First the 3rd step of system water cycle: hyperfiltration reverse-rinsing, open backwash water intaking valve, backwash draining valve, 1 minute time;
As above same procedure is carried out second system water cycle, the 3rd system water cycle, the 4th system water cycle and the 5th system water cycle;
The 6th the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2 minutes time;
The 6th second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45 minutes time;
The 6th the 3rd step of system water cycle: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, and hydrochloric acid adds 3 minutes dose 50mg/L time in the backwash water;
The 6th the 4th step of system water cycle: ultrafiltration adds soak, closes all valves, soak time 15 minutes;
The 6th the 5th step of system water cycle: ultrafiltration adds the flushing of sour backwash, and unlatching backwash water intaking valve, backwash draining valve wash washing time 3 minutes;
11 system water cycles of the 7th system water cycle to the are identical with five system water cycles of first system water cycle to the as above;
The 12 the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2 minutes time;
The 12 second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 50mg/L in the backwash water, NaOH adds dose 50mg/L, 3 minutes time;
The 12 the 4th step of system water cycle: backwash is strengthened in ultrafiltration, and close all valves and soak, soak time 15 minutes,
The 12 the 5th step of system water cycle: the flushing of backwash is strengthened in ultrafiltration, and unlatching backwash water intaking valve, backwash draining valve wash washing time 3 minutes;
Reach the 12 system water week after date and get into first system water cycle automatically, circulation.
Embodiment 2
First makes the water cycle first step: ultrafiltration exhaust full water, and open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2.5 minutes time;
First second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 47.5 minutes time;
First the 3rd step of system water cycle: hyperfiltration reverse-rinsing, open backwash water intaking valve, backwash draining valve, 1 minute time;
As above same procedure is carried out second system water cycle, the 3rd system water cycle, the 4th system water cycle and the 5th system water cycle;
The 6th the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2.5 minutes time;
The 6th second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 47.5 minutes time;
The 6th the 3rd step of system water cycle: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, and hydrochloric acid adds dose 75mg/L in the backwash water;
The 6th the 4th step of system water cycle: ultrafiltration adds soak, closes all valves, soak time 12.5 minutes;
The 6th the 5th step of system water cycle: ultrafiltration adds the flushing of sour backwash, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2.5 minutes;
11 system water cycles of the 7th system water cycle to the are identical with five system water cycles of first system water cycle to the as above;
The 12 the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2.5 minutes time;
The 12 second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 47.5 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 75mg/L in the backwash water, NaOH adds dose 75mg/L, 2.5 minutes time;
The 12 the 4th step of system water cycle: backwash is strengthened in ultrafiltration, and close all valves and soak, soak time 12.5 minutes,
The 12 the 5th step of system water cycle: the flushing of backwash is strengthened in ultrafiltration, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2.5 minutes;
Reach the 12 system water week after date and get into first system water cycle automatically, circulation.
Embodiment 3
First makes the water cycle first step: ultrafiltration exhaust full water, and open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 3 minutes time;
First second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 50 minutes time;
First the 3rd step of system water cycle: hyperfiltration reverse-rinsing, open backwash water intaking valve, backwash draining valve, 1 minute time;
As above same procedure is carried out second system water cycle, the 3rd system water cycle, the 4th system water cycle and the 5th system water cycle;
The 6th the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 3 minutes time;
The 6th second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 50 minutes time;
The 6th the 3rd step of system water cycle: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, and hydrochloric acid adds dose 100mg/L in the backwash water, 2 minutes time;
The 6th the 4th step of system water cycle: ultrafiltration adds soak, closes all valves, soak time 10 minutes;
The 6th the 5th step of system water cycle: ultrafiltration adds the flushing of sour backwash, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2 minutes;
11 system water cycles of the 7th system water cycle to the are identical with five system water cycles of first system water cycle to the as above;
The 12 the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 3 minutes time;
The 12 second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 50 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 100mg/L in the backwash water, NaOH adds dose 100mg/L, 2 minutes time;
The 12 the 4th step of system water cycle: backwash is strengthened in ultrafiltration, and close all valves and soak, soak time 10 minutes,
The 12 the 5th step of system water cycle: the flushing of backwash is strengthened in ultrafiltration, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2 minutes;
Reach the 12 system water week after date and get into first system water cycle automatically, circulation.
Embodiment 4
The 6th the 3rd step of system water cycle: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, adds hydrochloric acid in the backwash water, makes the pH value 2.2,3 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 50mg/L in the backwash water, adds NaOH and makes the pH value 9.8,3 minutes time;
All the other steps are with embodiment 1.
Embodiment 5
The 6th the 3rd step of system water cycle: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, adds hydrochloric acid in the backwash water, makes the pH value 2.0,2.5 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 75mg/L in the backwash water, adds NaOH and makes the pH value 10.0,2.5 minutes time;
All the other steps are with embodiment 2.
Embodiment 6
The 6th the 3rd step of system water cycle: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, adds hydrochloric acid in the backwash water, makes the pH value 1.8,2 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 100mg/L in the backwash water, adds NaOH and makes the pH value 10.2,2 minutes time;
All the other steps are with embodiment 3.
Bottom further specifies effect of the present invention through Test Example.
Certain the 2 * 300MW of genco unit is applied to ultrafiltration apparatus in the demineralized water treatment system, and demineralized water system current journey is: running water-variable frequency pump-security personnel's filter (aperture is 130 microns)-ultrafiltration apparatus-filtered water tank-clarified water pump-ion-exchanger.Ultrafiltration apparatus is the water source with the running water, adopts the mode of cross-current type, promptly in servicely discharges dense water simultaneously, removes the pollutant in the film tube with the mode that regularly adds clorox backwash and Chemical cleaning.Operating procedure is: operation-backwash-operation-backwash-operation-backwash chlorination backwash-operation, per 30 minutes in service automatic back-washings once each 1 minute backwash time, are made the chlorination backwash of water cycle once for per 3.Main supervision Inlet and outlet water turbidity in service, backwash chlorine residue, water outlet chlorine residue, water outlet oxidation-reduction potential, filter membrane tube pressure reduction and flow.Device design intake pressure maximum is 500 kPa, and normal intake pressure is 30～80kPa, and maximum transmembrane pressure is 200kPa, between the normal transmembrane pressure between 30～60kPa, and nominal output 100t/h, EIAJ 120t/h.
1,2, No. 3 ultrafiltration apparatus operations are after 1.5 months; Intake pressure is elevated to 160～180kPa by 30～80kPa under the normal condition, and transmembrane pressure is all greater than 100 kPa, film device discharge pressure 40kPa; Water flow is reduced to 62t/h by 100t/h, and the film transmitance is by 105 L/ (m
2H) reduce to 64 L/ (m
2H), because water temperature does not have variation basically, so temperature is little to the operational factor influence, opens ultrafiltration apparatus, and it is seriously dirty stifled to find that film takes place, and need carry out Chemical cleaning.Consider the ultrafiltration apparatus Chemical cleaning cycle normally should per 5～6 months once; So the ultrafiltration apparatus influent quality is defective or ultrafiltration apparatus is strengthened the backwash poor effect; But through water analysis being confirmed that influent quality meets the requirements, explains that causing the dirty stifled reason of ultrafiltration apparatus is to strengthen the backwash poor effect.
Take the inventive method to carry out the backwash of cross-current type milipore filter afterwards:
System transforms to the dosing backwash, single clorox is strengthened backwash change hydrochloric acid, clorox hydro-oxidation sodium reinforcement backwash into, has increased hydrochloric acid dosing tank, dosing pump and associated pipe newly, in liquor natrii hypochloritis's case, increases and joins sodium hydroxide solution.Transforming the back operation is:
First makes the water cycle first step: ultrafiltration exhaust full water, and to open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, behind the equal full water in both sides, this goes on foot completion, 2.5 minutes time;
First second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, produces 50 minutes water time;
First the 3rd step of system water cycle: hyperfiltration reverse-rinsing, open backwash water intaking valve, backwash draining valve, 1 minute time;
As above same procedure is carried out second system water cycle, the 3rd system water cycle, the 4th system water cycle and the 5th system water cycle;
The 6th the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 3 minutes time;
The 6th second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 50 minutes time;
The 6th the 3rd step of system water cycle: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, and hydrochloric acid adds dose 75mg/L in the backwash water;
The 6th the 4th step of system water cycle: ultrafiltration adds soak, closes all valves, soak time 12.5 minutes;
The 6th the 5th step of system water cycle: ultrafiltration adds the flushing of sour backwash, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2.5 minutes;
11 system water cycles of the 7th system water cycle to the are identical with five system water cycles of first system water cycle to the as above;
The 12 the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2.5 minutes time;
The 12 second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 47.5 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 75mg/L in the backwash water, NaOH adds dose 75mg/L, 2.5 minutes time;
The 12 the 4th step of system water cycle: backwash is strengthened in ultrafiltration, and close all valves and soak, soak time 12.5 minutes,
The 12 the 5th step of system water cycle: the flushing of backwash is strengthened in ultrafiltration, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2.5 minutes;
Reach the 12 system water week after date and get into first system water cycle automatically, circulation.
Transform about 7 months of running time of back ultrafiltration apparatus, three cover ultrafiltration apparatus system water cycles were brought up to 50 minutes from 30 minutes, had improved usage ratio of equipment greatly.Three cover ultrafiltration apparatus intake pressures are being between 50～80kPa all, and transmembrane pressure is all less than 60kPa, and maximum delivery turbidity is 0.27 NTU; Less than design load (＜1NTU), SDI is less than 2, less than design load (SDI＜3); Period three cover ultrafiltration apparatus was not all implemented Chemical cleaning; Wherein 1,2, No. 3 ultrafiltration is on average produced discharge and is reached metered flow 89.8%, 88.5%, 90.2% respectively, though do not reach the reason of design discharge be ultrafiltration apparatus water inlet in winter through heater, water temperature (actual 12～16 ℃) still is lower than 18～25 ℃ of optimum temperatures; This is a normal phenomenon, also is a measure of protection ultrafiltration apparatus.After the influence of deduction temperature factor, three cover ultrafiltration are exerted oneself and are all reached nominal output.Therefore move from transforming back three cover ultrafiltration, equipment operation condition is good, effluent quality is good, adheres to specification fully and the feed water by reverse osmosis water quality requirement, and operational factor is stable and all in scope of design.
Claims (1)
1. a cross-current type milipore filter back-washing method is characterized in that comprising the following steps:
First makes the water cycle first step: ultrafiltration exhaust full water, and open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
First second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45～50 minutes time;
First the 3rd step of system water cycle: hyperfiltration reverse-rinsing, open backwash water intaking valve, backwash draining valve, 1 minute time;
As above same procedure is carried out second system water cycle, the 3rd system water cycle, the 4th system water cycle and the 5th system water cycle;
The 6th the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
The 6th second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45～50 minutes time;
The 6th step in system water cycle the 3rd: ultrafiltration adds sour backwash, opens backwash water intaking valve, backwash draining valve, advances hydrochloric acid valve, hydrochloric acid dosing pump, and hydrochloric acid adds dose 50～100mg/L or pH value 1.8 ~ 2.2 in the backwash water, 2～3 minutes time;
The 6th the 4th step of system water cycle: ultrafiltration adds soak, closes all valves, soak time 10～15 minutes;
The 6th the 5th step of system water cycle: ultrafiltration adds the flushing of sour backwash, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2～3 minutes;
11 system water cycles of the 7th system water cycle to the are identical with five system water cycles of first system water cycle to the as above;
The 12 the system water cycle first step: ultrafiltration exhaust full water, open the influent side air bleeding valve, produce water exhaust valve side, water intaking valve, 2～3 minutes time;
The 12 second step of system water cycle: water is produced in the ultrafiltration operation, opens water intaking valve, produces water valve, 45～50 minutes time;
The 12 the 3rd step of system water cycle: backwash is strengthened in ultrafiltration; Add clorox and NaOH; Open backwash water intaking valve, backwash draining valve, advance the hypochlorous acid sodium valves, advance the hydroxide sodium valves, clorox dosing pump, NaOH dosing pump; Clorox adds dose 50～100mg/L, NaOH and adds dose 50～100mg/L or pH value 9.8 ~ 10.2,2～3 minutes time in the backwash water;
The 12 the 4th step of system water cycle: backwash is strengthened in ultrafiltration, and close all valves and soak, soak time 10～15 minutes,
The 12 the 5th step of system water cycle: the flushing of backwash is strengthened in ultrafiltration, and unlatching backwash water intaking valve, backwash draining valve wash washing time 2～3 minutes;
Reach the 12 system water week after date and get into first system water cycle automatically, circulation.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108686519A (en) * | 2018-08-16 | 2018-10-23 | 南京化学工业园热电有限公司 | A kind of back-washing method of ultrafiltration apparatus |
| CN115947416A (en) * | 2023-02-15 | 2023-04-11 | 高频美特利环境科技（北京）有限公司 | Treatment method for grinding recovered water |
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