CN110255755A - For mitigating the integral water treating method of fouling membrane - Google Patents
For mitigating the integral water treating method of fouling membrane Download PDFInfo
- Publication number
- CN110255755A CN110255755A CN201910454039.3A CN201910454039A CN110255755A CN 110255755 A CN110255755 A CN 110255755A CN 201910454039 A CN201910454039 A CN 201910454039A CN 110255755 A CN110255755 A CN 110255755A
- Authority
- CN
- China
- Prior art keywords
- mitigating
- fouling membrane
- treating method
- water
- water treating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
Abstract
The present invention discloses a kind of pre-oxidation for mitigating fouling membrane-tiny flocculation-high-rate fitration water process integral method, this method is that oxidant is added in raw water and sufficiently pre-oxidizes, later dosing coagulant and stirred carry out tiny flocculation reaction, and pass through high-rate fitration filter bed.The present invention not only significantly reduces fouling membrane process, and also improve the removal rate and water treatment efficiency of pollutant, save the energy consumption of membrane module operation, the cycle of operation for extending membrane module, scavenging period is shortened, reduces backwash cost, in addition occupied area is small, cost of investment is low, and is easy to implement flexibly, suitable for pre-processing before the advanced treating and film of municipal sewage and industrial wastewater.
Description
Technical field
The invention belongs to water-treatment technology fields, are related to dual-membrane process method and device, and in particular to one kind is for subtracting
The integral water treating method of light fouling membrane.
Background technique
In recent years, as sewage plant handles out the raising of pollution discharge standard and reuse water demand, membrane filtration technology
In micro-filtration, ultrafiltration, it is reverse osmosis frequently as sewage plant processing water outlet advanced treating and reuse water process core process.Although micro-
The membrane filtrations such as filter, ultrafiltration, reverse osmosis technology can effectively be removed particulate matter, bacterium and the dissolved organic matter in water,
But in the membrane module course of work, with film physics chemical action can occur for particulate matter, colloid and dissolved matter in water,
It adsorbed in the surface of film or fenestra, deposit and membrane aperture is gradually caused to become smaller or block, film is made to generate permeation flux reduction, separation
The phenomenon that characteristic variations, i.e. fouling membrane.This problem limits membrane technology in terms of advanced treatment of wastewater and reuse
Application.To cope with fouling membrane, alleviate fouling membrane frequently with oxidant is added online, and chemical cleaning is combined using backwash
Method makes the performance recovery of film or part be restored to original state.But there are many for current alleviation fouling membrane and Membrane cleaning technology
Problem, such as adding oxidant online will cause the oxidation of film filter layer and aging；Backwash and chemical cleaning are not only at high cost, and rush
Wash effect and not ideal enough.Therefore, how effectively to mitigate fouling membrane is this field technical problem urgently to be resolved.
Summary of the invention
The present invention be directed to membrane pollution problems existing for existing membrane filtration technology, provide a kind of pre-oxidation-for mitigating fouling membrane
Tiny flocculation-high-rate fitration integral method.
The integral water treating method for being used to mitigate fouling membrane of the invention, includes the following steps:
1) it pre-oxidizes: oxidant being added in raw water and is pre-oxidized, dosage 0.2-20mg/L, time of contact is
0.5-30min,；
2) tiny flocculation: to above-mentioned steps 1) oxidation after material dosing coagulant, be sufficiently mixed, carry out tiny flocculation reaction,
The hydraulics of application are to mix slowly 10~40s-1, time 2min, dosage is 1~10mg/L；
3) high-rate fitration: by high-rate fitration filter bed, filtering velocity is up to 20-85m/h.
Preferably, backwashing procedures are provided with.
Preferably, the backwashing procedures are rinsed using gas-gas water joint-water.
Preferably, any in the step 1) in the preferred ozone of oxidant, sodium hypochlorite, hydrogen peroxide or potassium permanganate
Kind.
Preferably, the preferred iron chloride of coagulant that is added in the step 2), aluminum sulfate, polyaluminium salts, polymeric ferric salt, multiple
It closes
Any one of ferro-aluminum or polyacrylamide.
Preferably, one or more of the preferred quartz sand of filter bed filter material, anthracite, haydite or manganese sand in the step 3)
Mixing.
Compared with prior art, the present invention having the positive effect that:
1, since the present invention first pre-oxidizes raw water, so that raw water small molecular organic matter is able to oxygenolysis,
Greatly reduce the phenomenon that it adsorbs in the surface of film or fenestra, deposits and membrane aperture is gradually caused to become smaller or block, goes forward side by side one
Step improves water treatment efficiency.Colloid and surface particles property are changed simultaneously, is that subsequent tiny flocculation and high-rate fitration process are created
Superiority condition.Meanwhile coagulant charging quantity is substantially reduced, reduce inorganic matter fouling membrane caused by coagulant dosage.
2, tiny flocculation and high-rate fitration technology are used after pre-oxidation due to the present invention, further to colloid in raw water and
Particulate matter is removed.Tiny flocculation is by being added coagulant into pipeline and being formed by pipe-line mixer and tiny flocculation pond small
Wadding body, high speed filter bed can effectively remove small wadding body, and realize high filtering velocity.The process can will cause the colloid of fouling membrane
It is effectively removed with particulate matter, and further increases water treatment efficiency.
3, since fouling membrane can be mitigated significantly using technical solution of the present invention, even if thus being backwashed, backwash
Process is also more easy, and cost can also be greatly lowered.
4, since the present invention is water process integrated technique, processing capacity is strong, and occupied area is small, and cost of investment is low, and real
Easy flexible (can assemble according to multiple collocation that need to carry out of processing water) is applied, Industrial Wastewater Treatment advanced treating is also suitable for
And film pre-treatment.
5, the present invention can be not only used for newly-built water treatment system, it can also be used to which the transformation to built equipment, application prospect is very
It is wide.
Specific embodiment
The present invention is further illustrated below with reference to example, but given embodiment should not be understood as to the present invention
The limitation of protection scope, thus professional and technical personnel is non-according to made by the content of aforementioned present invention and design philosophy
The modifications and adaptations of matter also should belong to protection scope of the present invention.
Backwashing procedures are rinsed using gas-gas water joint-water:
Gas flushing: unlatching backwash aerator, which carries out gas, to be washed, and gas backwash stage intensity is 10-15L (sm2)-1,
Last 4min.
Air water joint is rinsed: opening backwash aerator and backwash pump carries out air-water backwashing, stage gas punching
Intensity is constant；Water backwashing intensity is 20-25L (sm2)-1, last 4-5min.
Water rinses: closing backwash aerator, opens backwash pump and carry out water flushing, water backwashing intensity is 20-
25L·(s·m2)-1, last 4-5min.
Embodiment 1
The present invention is applied to pre-process before Tianjin petrifaction sewage treatment plant wastewater from chemical industry two stage biological handles out moisture film, adopts
With ozone pre-oxidation-tiny flocculation-high-rate fitration mode.
Each stage process parameter is as follows:
1, the ozone pre-oxidation stage: ozone dosage 7-20mg/L；Time of contact is 10-30min；
2, the tiny flocculation stage: flocculant uses iron chloride, aluminum sulfate, polyaluminium salts, polymeric ferric salt, Complex aluminium-iron or poly- third
Any one of acrylamide, dosage 1-5mg/L, mixing use pipe-line mixer；
3, the high-rate fitration stage: filtering velocity is lower than 5NTU up to 20-50m/h, delivery turbidity.
Embodiment 2
The present invention is applied to pre-process before Tianjin industrial park centralized wastewater treatment factory SBR goes out moisture film, using permanganic acid
Potassium pre-oxidation-tiny flocculation-high-rate fitration mode.
Each stage process parameter is as follows:
1, the Potassium Permanganate Preoxidation stage: dosage 0.1-10mg/L；Time of contact is 0.5min；
2, the tiny flocculation stage: flocculant uses iron chloride, aluminum sulfate, polyaluminium salts, polymeric ferric salt, Complex aluminium-iron or poly- third
Any one of acrylamide, dosage 0.2-5mg/L, mixing use pipe-line mixer；
3, the high-rate fitration stage: filtering velocity is lower than 5NTU up to 20-50m/h, delivery turbidity.
Embodiment 3
The present invention is discharged applied to Tianjin sewage treatment plant biological tank, using Potassium Permanganate Preoxidation-tiny flocculation-high speed
The mode of filtering.
Each stage process parameter is as follows:
1, the Potassium Permanganate Preoxidation stage: dosage 0.1-3mg/L；Time of contact is less than 0.5min；
2, the tiny flocculation stage: flocculant uses iron chloride, aluminum sulfate, polyaluminium salts, polymeric ferric salt, Complex aluminium-iron or poly- third
Any one of acrylamide, dosage 0.2-5mg/L, mixing use pipe-line mixer；
3, the high-rate fitration stage: for filtering velocity up to 20-85m/h, delivery turbidity is lower than 5NTU, and total phosphorus is less than 0.5mg/L.
Although the preferred embodiment of the present invention is described above, the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, is not restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very
Multi-form specific transformation, within these are all belonged to the scope of protection of the present invention.
Claims (7)
1. the integral water treating method for mitigating fouling membrane, which comprises the steps of:
1) it pre-oxidizes: oxidant being added in raw water and is pre-oxidized, dosage 0.2-20mg/L, time of contact 0.5-
30min,；
2) tiny flocculation: to above-mentioned steps 1) oxidation after material dosing coagulant, be sufficiently mixed, carry out tiny flocculation reaction, apply
Hydraulics be mix slowly 10~40s-1, time 2min, dosage is 1~10mg/L；
3) high-rate fitration: by high-rate fitration filter bed, filtering velocity is up to 20-85m/h.
2. according to claim 1 for mitigating the integral water treating method of fouling membrane, which is characterized in that the step
3) backwashing procedures are provided with.
3. according to claim 2 for mitigating the integral water treating method of fouling membrane, which is characterized in that the recoil
Washing procedure is rinsed using gas-gas water joint-water.
4. according to claim 2 for mitigating the integral water treating method of fouling membrane, which is characterized in that the recoil
Wash water reenters in system raw water after precipitating.
5. according to claim 1 for mitigating the integral water treating method of fouling membrane, which is characterized in that the step
1) any one of the preferred ozone of oxidant, sodium hypochlorite, hydrogen peroxide or potassium permanganate in.
6. according to claim 1 for mitigating the integral water treating method of fouling membrane, which is characterized in that the step
2) in the preferred iron chloride of the coagulant added in, aluminum sulfate, polyaluminium salts, polymeric ferric salt, Complex aluminium-iron or polyacrylamide
It is any.
7. according to claim 1 for mitigating the integral water treating method of fouling membrane, which is characterized in that the step
3) one or more of the preferred quartz sand of filter bed filter material, anthracite, haydite or manganese sand mix in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454039.3A CN110255755A (en) | 2019-05-28 | 2019-05-28 | For mitigating the integral water treating method of fouling membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454039.3A CN110255755A (en) | 2019-05-28 | 2019-05-28 | For mitigating the integral water treating method of fouling membrane |
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| Publication Number | Publication Date |
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| CN110255755A true CN110255755A (en) | 2019-09-20 |
Family
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| CN201910454039.3A Pending CN110255755A (en) | 2019-05-28 | 2019-05-28 | For mitigating the integral water treating method of fouling membrane |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997029995A1 (en) * | 1996-02-12 | 1997-08-21 | Aqua System A/S | Plant for production of drinking water from unfiltered water |
| CN101759309A (en) * | 2008-12-10 | 2010-06-30 | 东丽纤维研究所（中国）有限公司 | Water treatment technology |
| CN102259991A (en) * | 2010-05-28 | 2011-11-30 | 苏州立升净水科技有限公司 | Chemical pretreatment method for controlling membrane fouling |
| CN102583810A (en) * | 2011-01-10 | 2012-07-18 | 中国科学院生态环境研究中心 | Method for removing arsenic by using Fe (II) and Mn (II) in underground water |
-
2019
- 2019-05-28 CN CN201910454039.3A patent/CN110255755A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997029995A1 (en) * | 1996-02-12 | 1997-08-21 | Aqua System A/S | Plant for production of drinking water from unfiltered water |
| CN101759309A (en) * | 2008-12-10 | 2010-06-30 | 东丽纤维研究所（中国）有限公司 | Water treatment technology |
| CN102259991A (en) * | 2010-05-28 | 2011-11-30 | 苏州立升净水科技有限公司 | Chemical pretreatment method for controlling membrane fouling |
| CN102583810A (en) * | 2011-01-10 | 2012-07-18 | 中国科学院生态环境研究中心 | Method for removing arsenic by using Fe (II) and Mn (II) in underground water |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190920 |
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