CN100558647C - A kind of double-membrane method water treatment system and water treatment method - Google Patents
A kind of double-membrane method water treatment system and water treatment method Download PDFInfo
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- CN100558647C CN100558647C CNB2006100495298A CN200610049529A CN100558647C CN 100558647 C CN100558647 C CN 100558647C CN B2006100495298 A CNB2006100495298 A CN B2006100495298A CN 200610049529 A CN200610049529 A CN 200610049529A CN 100558647 C CN100558647 C CN 100558647C
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Abstract
The invention provides a kind of double-membrane method water treatment system, it comprises pretreatment unit and desalination unit, behind pretreatment unit before the desalination unit, be provided with the pressure container for storing liquid, pretreatment unit provides feed liquor to the pressure container for storing liquid, the pressure container for storing liquid provides feed liquid to desalination unit, and the pressure container for storing liquid also provides backwash liquid to pretreatment unit.The present invention is stored in the pressure container for storing liquid energy, and carries feed liquid continuously, provides backwash liquid to pretreatment unit to desalination unit in view of the above.The present invention also provides a kind of double-membrane water treatment method that is based upon on the above-mentioned water treatment system.This method is utilized pretreatment unit that the storage of pressure receiver pressed and be closed feed liquor valve branch road to open the pressure difference that the pressure drop that causes produces because of wash water valve and is implemented instantaneous pulsation backwash, backwash speed is fast, the backwash liquid consumption is few, technology is simple, reliable, be applicable to and adopt in the continuous double-membrane method water treatment system that this pressure receiver is also as the continuous feeding liquid system of follow-up desalination unit simultaneously.
Description
Technical field
The present invention relates to a kind of double-membrane method water treatment system and water treatment method.
Background technology
Adopting two membrane process crafts is novel procesies of the present world and domestic active research.It mainly is the pretreatment unit before adopting membrane filtration as reverse osmosis or nanofiltration, the influent quality of reverse osmosis or nanofiltration is improved a lot and stable effluent quality than conventional pre-treatment, the operation life of reverse osmosis or nanofiltration membrane element is improved, and system's cycle of operation prolongs, and design variable improves.For the pretreatment unit that adopts membrane filtration, need regularly backwash to keep the long-time running flux of pretreatment unit.Currently used back-washing method all is in the pretreatment unit outlet transition water tank to be set, and the pretreatment unit filtrate is put into this water tank, and backwashing pump of water tank outlet operated by rotary motion provides backwash liquor to pretreatment unit.An intermediate booster pump is set again, the pretreatment unit filtrate is transported in reverse osmosis or the nanofiltration system by pump.Compare with conventional pretreatment technology, increased intermediate booster pump, also just increased energy consumption and the middle chance of polluting.
Summary of the invention
The present invention's technical problem at first to be solved provides a kind of a kind of double-membrane method water treatment system of saving energy consumption of comparing with conventional art.For this reason, the present invention is by the following technical solutions: it comprises pretreatment unit and desalination unit, pretreatment unit comprises one the road or the pre-treatment branch road of several parallel connection, branch road is provided with pretreatment unit, before the desalination unit, be provided with the pressure container for storing liquid behind pretreatment unit, pretreatment unit provides feed liquor to the pressure container for storing liquid, the pressure container for storing liquid provides feed liquid to desalination unit, and the pressure container for storing liquid also provides backwash liquid to pretreatment unit.The present invention is stored in the pressure container for storing liquid energy, and carries feed liquid continuously, provides backwash liquid to pretreatment unit to desalination unit in view of the above.Compare with double-membrane method water treatment system in the past, saved intermediate booster pump, reduced energy consumption and the middle chance of polluting.
Another technical problem to be solved of the present invention provides a kind of double-membrane water treatment method of saving energy consumption.For this reason, the present invention is by the following technical solutions: it utilizes aforementioned double-membrane method water treatment system, and may further comprise the steps:
Utilize the air pressure in the pressure container for storing liquid to provide feed liquor to desalination unit;
The pretreatment unit feed liquor valve of pre-treatment branch road is closed or closed by turns to certain hour at interval, and open the pretreatment unit wash water valve that is closed feed liquor valve branch road simultaneously, utilize the air pressure in the pressure container for storing liquid to provide backwash liquid to being closed feed liquor valve branch road pretreatment unit, behind the back flushing certain hour, open the pretreatment unit feed liquor valve that is closed feed liquor valve branch road, behind the flushing certain hour, close the pretreatment unit wash water valve that is rinsed branch road, this branch road returns to normal operation.
Water treatment method provided by the invention utilizes pretreatment unit that the storage of pressure receiver pressed and be closed feed liquor valve branch road to open the pressure difference that the pressure drop that causes produces because of wash water valve and implements instantaneous pulsation backwash, backwash speed is fast, the backwash liquid consumption is few, technology is simple, reliable, be applicable to and adopt in the continuous double-membrane method water treatment system, this pressure receiver reduces the energy consumption of two membrane process crafts also as the continuous feeding liquid system of follow-up desalination unit simultaneously.
Below with reference to accompanying drawing the present invention is done detailed explanation.But these explanations are not to be construed as limiting the scope of the invention.
Description of drawings
Fig. 1 is the synoptic diagram of a kind of embodiment of the present invention.
Embodiment
With reference to accompanying drawing.The present invention includes pretreatment unit 11 and desalination unit 9, pretreatment unit comprises one the road or the pre-treatment branch road of several parallel connection, branch road is provided with pretreatment unit, behind pretreatment unit before the desalination unit, be provided with pressure container for storing liquid 8, pretreatment unit provides feed liquor to the pressure container for storing liquid, and the pressure container for storing liquid provides feed liquid to desalination unit, and the pressure container for storing liquid also provides backwash liquid to pretreatment unit.
As shown in Figure 1, it is provided with to pretreatment unit liquid feeding pump 1 is provided, and pretreatment unit is divided into the pre-treatment branch road of several parallel connection, can recoil to branch road by turns like this, make that pretreatment unit can be constantly to pressure container for storing liquid 8 feed flows, and reduce the time and the fluid volume of each recoil.Be provided with pretreatment unit 6 on branch road, it can adopt ultrafiltration or micro-filtration filter assemblies.With respect to pretreatment unit, be provided with its feed liquor valve 2, liquor inlet 3, filtered solution outlet 7 and sewage draining exit 5, wash water valve 4.Sewage draining exit 5 should be to lower opening, the suitable upward opening of filtered solution outlet.Desalination parts in the desalination unit 9 can adopt reverse-osmosis membrane element or nanofiltration membrane element.
The pressure container for storing liquid is the container for storing liquid that contains certain air pressure of hermetic seal.The pressure container for storing liquid can be the container for storing liquid of hermetic seal also, is provided with the gas-storing bag with certain air pressure in the container for storing liquid.What present embodiment adopted is the former structure.
In order to realize automatic control, the present invention also can be provided with pilot circuit 10.Pilot circuit can adopt the pilot circuit that is made of the time relay, intermediate relay or control the pilot circuit that components and parts constitute automatically by PLC, the switch of its control pretreatment unit feed liquor valve 2, wash water valve 4, liquid feeding pump 1.Described circuit is the pilot circuit commonly used of present employing.
With regard to water treatment method, utilizing on the basis of aforementioned double-membrane method water treatment system, may further comprise the steps:
Utilize the air pressure in the pressure container for storing liquid to provide feed liquor to desalination unit;
Certain hour is closed the pretreatment unit feed liquor valve 2 of pre-treatment branch road by turns at interval, and open the pretreatment unit wash water valve 4 that is closed feed liquor valve branch road simultaneously, utilize the air pressure in the pressure container for storing liquid to provide backwash liquid to being closed feed liquor valve branch road pretreatment unit, behind the back flushing certain hour, open the pretreatment unit feed liquor valve that is closed feed liquor valve branch road, behind the flushing certain hour, close the pretreatment unit wash water valve that is rinsed branch road.This branch road pretreatment unit is finished cleaning step, continues to pressure container for storing liquid feed flow.Carry out the above-mentioned cleaning step of other branch road again.
But the gas of preliminary filling certain pressure (as 0.05MPa) and account for the feed liquid of tank volume about 2/3 in the pressure container for storing liquid.During normal the operation, under the supercharging of liquid feeding pump 1, feed liquid enters pretreatment unit, behind membrane filtration, filtrate enters the pressure receiver, and at this moment, gas volume is reduced, the jar internal pressure increases, and when the jar internal pressure increased 0.15MPa, material liquid volume was about 2/3 of tank volume in the pressure vessel at this moment.If be provided with under the situation of pilot circuit, the time of setting, close one of them or the pretreatment unit feed liquor valve of part pre-treatment branch road wherein, and open the wash water valve of the pretreatment unit that is closed feed liquor valve branch road simultaneously, the pressure that be closed the pretreatment unit influent side of feed liquor valve branch road this moment drops to 0 rapidly, this branch road pretreatment unit forms reverse pressure reduction, the instantaneous face that oppositely passes through of feed liquid in the pressure vessel, the dirt that is blocked in fenestra and face is washed open, open this branch road feed liquor valve after several seconds, because this moment, wash water valve did not close, therefore the feeding-passage resistance is very little, and the normal inlet amount increase of solid-liquid ratio of breaking through feeding side is many, and big flow washes away face after tens seconds, close wash water valve, recover the normal operation of this branch road pretreatment unit; Then carry out back flushing at the feed liquor valve of closing other branch road ... circulation is carried out.When a pretreatment unit carries out when Xian operates, because the reduction of feed volume that leaches of pretreatment unit reduces, also need to expend some filtrates simultaneously and be used for backwash, therefore the feed liquid in the pressure receiver can reduce, pressure can reduce, reduce to 0.1MPa as pressure from 0.15MPa, then the volume of feed liquid in jar reduces to about 1/2 from original about 2/3.The feed liquid reduction is about 1/6 of tank volume.As long as configure the time of flushing, just can calculate the reduction of pressure receiver feed liquid when washing, also just can calculate the volume of required pressure receiver.
Because the online backwash time is very short, the water yield of on-line cleaning autophage seldom, add one road pretreatment unit when carrying out backwash, other branch road pretreatment unit is still in normal operation, and because the filtrate wall pressure descends, the liquid outlet quantity of other branch road pretreatment unit can increase, and the total liquid outlet quantity of pretreatment unit is unlikely to reduce a lot, the feed liquid reduction of pressure container for storing liquid is less, and therefore a less pressure receiver just can be finished the work.
When the pre-treatment branch road of pretreatment unit has only one the tunnel, certain hour is closed the pretreatment unit feed liquor valve of pre-treatment branch road at interval, and open wash water valve simultaneously, utilize the air pressure in the pressure container for storing liquid to provide backwash liquid, behind the back flushing certain hour, open the feed liquor valve to being closed feed liquor valve branch road, behind the flushing certain hour, close wash water valve, carry out normal pre-treatment, circulation is carried out.Owing to when backwash, all be feed liquid in the pressure container for storing liquid to desalination unit institute feed liquid, also to consume some backwash liquids simultaneously, therefore, the space of container for storing liquid will be considered bigger, to guarantee the required feed liquid supply of desalination unit in flush time.
Claims (8)
1, a kind of double-membrane method water treatment system, comprise pretreatment unit and desalination unit, it is characterized in that pretreatment unit comprises one the road or the pre-treatment branch road of several parallel connection, branch road is provided with pretreatment unit, and described pretreatment unit is provided with feed liquor valve and wash water valve, behind pretreatment unit before the desalination unit, be provided with the pressure container for storing liquid, pretreatment unit provides feed liquor to the pressure container for storing liquid, and the pressure container for storing liquid provides feed liquid to desalination unit, and the pressure container for storing liquid also provides backwash liquid to pretreatment unit.
2, a kind of double-membrane method water treatment system as claimed in claim 1 is characterized in that described pressure container for storing liquid is the container for storing liquid that contains certain air pressure of hermetic seal.
3, a kind of double-membrane method water treatment system as claimed in claim 1 is characterized in that described pressure container for storing liquid is the container for storing liquid of hermetic seal, is provided with the gas-storing bag with certain air pressure in the container for storing liquid.
4,, it is characterized in that described pretreatment unit adopts ultrafiltration or micro-filtration filter assemblies as claim 1,2 or 3 described a kind of double-membrane method water treatment systems.
5,, it is characterized in that the desalination parts in the described desalination unit adopt reverse-osmosis membrane element or nanofiltration membrane element as claim 1,2 or 3 described a kind of double-membrane method water treatment systems.
6, as claim 1,2 or 3 described a kind of double-membrane method water treatment systems, it is characterized in that it also comprise constitute by the time relay and intermediate relay or control the pilot circuit that is used for controlling pretreatment unit wash water valve feed liquor threshold switch that components and parts constitute automatically by PLC.
7, a kind of double-membrane water treatment method is characterized in that it utilizes the described double-membrane method water treatment system of claim 1, and the pretreatment unit in the described double-membrane method water treatment system comprises the pre-treatment branch road of several parallel connection, and may further comprise the steps:
Utilize the air pressure in the pressure container for storing liquid to provide feed liquid to desalination unit;
The pretreatment unit feed liquor valve of pre-treatment branch road is closed or closed by turns to certain hour at interval, and open the pretreatment unit wash water valve that is closed feed liquor valve branch road simultaneously, utilize the air pressure in the pressure container for storing liquid to provide backwash liquid to being closed feed liquor valve branch road pretreatment unit, behind the back flushing certain hour, open the pretreatment unit feed liquor valve that is closed feed liquor valve branch road, behind the flushing certain hour, close the pretreatment unit wash water valve that is rinsed branch road, this branch road returns to normal operation.
8, a kind of double-membrane water treatment method is characterized in that it utilizes the described double-membrane method water treatment system of claim 1, and the pretreatment unit in the described double-membrane method water treatment system comprises one tunnel pre-treatment branch road, and may further comprise the steps:
Utilize the air pressure in the pressure container for storing liquid to provide feed liquid to desalination unit;
Certain hour is closed the pretreatment unit feed liquor valve of pre-treatment branch road at interval, and open the pretreatment unit wash water valve simultaneously, utilize the air pressure in the pressure container for storing liquid to provide backwash liquid to pretreatment unit, behind the back flushing certain hour, open pretreatment unit feed liquor valve, behind the flushing certain hour, close the pretreatment unit wash water valve, this branch road returns to normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100495298A CN100558647C (en) | 2006-02-16 | 2006-02-16 | A kind of double-membrane method water treatment system and water treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100495298A CN100558647C (en) | 2006-02-16 | 2006-02-16 | A kind of double-membrane method water treatment system and water treatment method |
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| CN1807268A CN1807268A (en) | 2006-07-26 |
| CN100558647C true CN100558647C (en) | 2009-11-11 |
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| CNB2006100495298A Expired - Fee Related CN100558647C (en) | 2006-02-16 | 2006-02-16 | A kind of double-membrane method water treatment system and water treatment method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462801B (en) * | 2009-01-16 | 2011-01-26 | 首钢总公司 | System and process for desalting steel comprehensive sewage reuse water by double-membrane method |
| CN101798128B (en) * | 2010-04-10 | 2012-07-04 | 龙口煤电有限公司 | Underground movable reverse osmosis water treating equipment and treating process thereof for coal mine |
| CN103787463B (en) * | 2014-03-07 | 2015-08-05 | 大连朗旭环境科技有限公司 | A kind of pressurized air that uses is as the membrane method water treatment system of driving-energy |
| CN106000111A (en) * | 2016-07-13 | 2016-10-12 | 王龙 | Filter element washing protecting system in reverse osmosis water production system |
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Owner name: HANGZHOU WATER TREATMENT TECHNOLOGY RESEARCH DEVEL Free format text: FORMER NAME: HANGZHOU WATER TREATMENT TECHNOLOGY RESEARCH DEVELOPMENT CENTER, NATIONAL OCEAN SERVICE |
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Address after: Xihu District city of Hangzhou in West Zhejiang province 310012 No. 50 Patentee after: Hangzhou Water Treatment Technology Development Center Co., Ltd. Address before: Xihu District city of Hangzhou in West Zhejiang province 310012 No. 50 Patentee before: Hangzhou Water Treatment Technology Research Development Center, The National Bu |
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