CN101759309A - Water treatment technology - Google Patents
Water treatment technology Download PDFInfo
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- CN101759309A CN101759309A CN200810244553A CN200810244553A CN101759309A CN 101759309 A CN101759309 A CN 101759309A CN 200810244553 A CN200810244553 A CN 200810244553A CN 200810244553 A CN200810244553 A CN 200810244553A CN 101759309 A CN101759309 A CN 101759309A
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Abstract
The invention discloses a water treatment technology, which comprises that coagulant is added and mixed in raw water, the raw water is treated through an upflow filter tank, the outlet water enters an ultrafiltration membrane for filtration and the product water is obtained. Through the upflow filtration, the coagulation reaction is accelerated and large particles are filtered, so the ultrafiltration membrane is protected, the removal rate of organic matters is improved and the membrane pollution speed is reduced. The ultrafiltration membrane can effectively remove particles in water and can ensure the quality of the outlet water. The chemical cleaning period can be prolonged by two to five months and the removal rate of the organic matters and SiO2 can be improved by 20-60 percent. The method can effectively improve the removal rate of the organic matters, reduce the energy consumption and prolong the service life of the ultrafiltration membrane.
Description
Technical field
The invention belongs to water technology, be specifically related to a kind of going up to filtering the technology of coagulation ultrafiltration coupling to surface water, seawater or sewage disposal.
Background technology
Ultra-filtration technique has that floor space is little, stable effluent quality, to the effective advantage such as removal of pathogeny body, in water treatment field broad application prospect is arranged.But because the membrane pore size of ultrafiltration is bigger, to the organic matter removal weak effect.In application process, accumulate gradually on the film surface and can not be caused film to pollute by the material of hydrodynamic cleaning, film pollutes and causes frequent matting to reduce the life-span.For the hollow fibre filament ultra-filtration membrane, fracture of wire causes delivery turbidity to increase, and the pathogeny body leaks.Coagulation is the technology of widespread use in the water treatment, and coagulating sedimentation can reduce the turbidity in the water effectively, and enhanced coagulation has removal effect to organism in the water.Coagulating sedimentation can not effectively reduce film and pollute speed, and enhanced coagulation causes the fracture of wire frequency to improve.
Dong Bingzhi etc. adopt coagulation ultrafiltration coupling technology, are under the micro-polluted surface water condition at former water, adopt coagulation ultrafiltration coupling technique, and effluent quality reaches drinking water standard.(Treatment of Industrial Water, 2008 the 28th the 1st phases of volume, 40-43 page or leaf) but this technology can not effectively prevent film pollutes can not reduce the fracture of wire frequency.
Summary of the invention
The objective of the invention is to overcome the shortcoming in the above-mentioned ultra-filtration technique, a kind of coagulation-go up to filtrations-ultrafiltration coupling is provided, technology is simple, and to organism, turbidity removal efficient height, the film that can control simultaneously ultra-filtration membrane pollutes, the water technology of reduction wire broken rate.
Purpose of the present invention can reach by following measure:
A kind of water technology, this technology comprises: dosing coagulant among the Xiang Yuanshui, after the mixing, to handle to filtering basin on the process, water outlet enters ultra-filtration membrane and filters, and obtains product water.
Wherein coagulating agent is polyaluminium sulfate, aluminum chloride or iron(ic) chloride, and the addition of coagulating agent is in Al or Fe 0.5～30mg/L.
Go up and to comprise water distributing area, homogeneous filtering layer and protective belt to filtering basin, wherein the filtrate of homogeneous filtering layer particle diameter be 3～70mm, thickness is 60～150cm, the height of this protective belt is preferably 30～50cm.Upward comprise and filtering and two operation phase of back flushing, intake by raw water pump to filtering basin.During filtration, open V2, close V1, it is 8～25m/h that the adjusting raw water pump makes surface load; During back flushing, close V2, open V2, it is 10～50m/h that the adjusting raw water pump makes surface load.
In this technology, go up to filtering basin and mainly play the effect of removing larger particles and improving coagulation effect.After larger particles is removed, can effectively reduce the wire broken rate of ultra-filtration membrane.After improving coagulation effect, it is retarded that the film of ultra-filtration membrane pollutes speed.Because filtering layer is low, the filtrate granularity is big, and this technical load is higher than common process.Go up to filtering basin water inlet and flushing and adopt same pump, simple in structure.Filtering velocity brings the high problem of delivery turbidity to overcome by subsequent ultrafiltration technology more greatly.
Ultra-filtration membrane can be a pressure type, also can be immersion, and dead-end filtration technology is preferably adopted in ultrafiltration.Its working pressure is preferably 0.02～0.15MPa in the dead-end filtration technology.During filtration, open out water pump, open V3, the diafiltration cycle is preferably 20～60min excessively; During back flushing, open V4, open V5, open backwashing pump, close V3, close out water pump, back washing strength is preferably 60～200L/m2/h, and flush time is preferably 30～60s.
Technology of the present invention can be handled surface water, seawater or sewage.
Adopting the present invention to handle in the water of back does not have particulate matter, and delivery turbidity is lower than 0.15NTU.When former water is surface water, can reach drinking water standard.When applying the present invention in the brine disposal, water outlet can be advanced reverse osmosis.
Water technology of the present invention has following advantage:
1, coagulating agent forms the organism that pollutes ultra-filtration membrane in the flco planar water through the mixing of pump with upward to filtering stirring among the present invention, improves ultrafiltration to removal effect of organic matter, compares this technology with direct ultra-filtration and can improve 20～60% organism.
2, the present invention adopts to filtering the coagulation ultra-filtration technique, filters out large particulate matter in the water, thereby the protection ultra-filtration membrane reduces wire broken rate, compares with coagulation ultrafiltration coupling technology, adopts this invention can obviously reduce the direct filtration wire broken rate.
3, in the employing to filtering the coagulation ultra-filtration technique, coagulating agent makes organism can not be trapped in fenestra inside on the film surface, thereby reduce the speed of irreversible pollution, adopt the present invention can prolong the 2～May of cycle of matting, cut down the consumption of energy and prolong work-ing life of ultra-filtration membrane.
Description of drawings
Fig. 1 is the schema of this technology.
V1 among the figure～5 are valve.
Embodiment
Testing method:
(1) SDI; The mud pollution index adopts 0.45 micron to filter mensuration, and 15min before and after the contrast filters the 500ml water filtration time;
(2) COD
Mn: alkali formula potassium permanganate process
(3) turbidity: HACH turbidometer
Measure frequency: 1 time/2 days
Embodiment 1
In the former water of certain micro-polluted water, use the present invention.In surface water, add aluminum chloride 5mg/L (in Al) and squeeze into to filtration, go up to filtering water outlet and directly enter the pressure type ultra-filtration membrane through pump; Upward flow filter particle diameter 5mm, filtering layer filtrate thickness 70cm, protective belt height 30cm, filtering surface load 10m/h, flushing surface load 30m/h, the flushing frequency is 1 time/day.Ultra-filtration membrane flux 1.5m/d, filtration time 30min, back flushing 1min, gas bleed 30s; Do not have particulate matter in this handicraft product water, turbidity is lower than 0.15NTU; This technology is to the organic removal rate height, to the organic COD of representative in the water
MnAnd UV
254Clearance be respectively 70% and 50%; Film pollutes and is effectively controlled, and matting goes the cycle greater than 100 days; In this stage operational process, fracture of wire does not appear in ultra-filtration membrane.
| ??COD Mn(mg/L) | ??UV 254(cm-1) | Turbidity (NTU) | |
| Former water | ??8.0 | ??0.100 | ??20 |
| Product water | ??2.4 | ??0.050 | ??0.12 |
Embodiment 2:
In coastal polluted seawater, adopt this technology.Add iron(ic) chloride 5mg/L (in Fe) in the former water and squeeze into to filtration, go up to filtering water outlet and directly enter submerged ultrafiltration through pump; Upward flow filter particle diameter 8mm, the thick 80cm of filtering layer filtrate, protective belt height 30cm, filtering surface load 12m/h, flushing surface load 40m/h, the flushing frequency is 1 time/day; Ultra-filtration membrane flux 1.0m/d, filtration time 30min, back flushing 1min simultaneously gas towards 1min; The product water turbidity is less than 0.1NTU, and SDI is less than 3, COD
MnClearance is 42%, can directly enter reverse osmosis system; Film pollutes and is effectively controlled, and the matting cycle was greater than 90 days.There is not fracture of wire in the operational process.
| ??COD Mn(mg/L) | ??SDI | Turbidity (NTU) | |
| Former water | ??6.0 | ??＞6.7 | ??10 |
| Product water | ??3.5 | ??2.1 | ??0.08 |
Comparative example 1
In the former water with embodiment 1, do not have coagulation, no upward flow filter, test.Direct forced ultra-filtration membrane; Ultra-filtration membrane flux 1.3m/d, filtration time 30min, back flushing 1min; To the organic COD of representative in the water
MnAnd UV
254Clearance be respectively 45% and 33%.Move to 20 days, fracture of wire occurs, turbidity surpasses 1.0NTU, and the matting cycle is shorter than 30 days.
| ??COD Mn(mg/L) | ??UV 254(cm-1) | |
| Former water | ??8.2 | ??0.100 |
| Product water | ??4.5 | ??0.067 |
Comparative example 2
In the former water with embodiment 2, carry out coagulation-precipitation-sand filtration-ultrafiltration test.Former water enters mechanical stirring-tube settler after adding iron(ic) chloride 5mg/L (in Fe), and the settling tank water outlet enters the gravity valveless filter tank, and the filter tank water outlet enters submerged ultrafiltration.Ultra-filtration membrane flux 1.0m/d, filtration time 30min, back flushing 1min simultaneously gas towards 1min; Pollution of Ultrafiltration Membrane is uncontrollable, moves 24 hours continuously, and filter pressure surpasses 80KPa (the ultra-filtration membrane operation upper limit), and by forced-stopping machine, the matting cycle is about 1 day.
Claims (7)
1. water technology is characterized in that this technology comprises: dosing coagulant among the Xiang Yuanshui, after the mixing, to handle to filtering basin on the process, and water outlet enters ultra-filtration membrane and filters, and obtains product water.
2. water technology according to claim 1 is characterized in that described coagulating agent is polyaluminium sulfate, aluminum chloride or iron(ic) chloride.
3. water technology according to claim 1 and 2, the addition that it is characterized in that described coagulating agent is in Al or Fe 0.5～30mg/L.
4. water technology according to claim 1 is characterized in that described go up comprises water distributing area, homogeneous filtering layer and protective belt to filtering basin, wherein the filtrate of homogeneous filtering layer particle diameter be 3～70mm, thickness is 60～150cm.
5. according to claim 1 or 4 described water technologies, it is characterized in that described going up to filtering basin comprises filtration and two operation phase of back flushing, during filtration, surface load is 8～25m/h; During back flushing, surface load is 10～50m/h.
6. water technology according to claim 1 is characterized in that ultrafiltration adopts the mode of dead-end filtration.
7. according to claim 1 or 6 described water technologies, it is characterized in that the dead-end filtration working pressure is 0.02～0.15MPa, backwashing period 20～60min, back washing strength 60～200L/m
2/ h, flush time 30～60s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810244553A CN101759309A (en) | 2008-12-10 | 2008-12-10 | Water treatment technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810244553A CN101759309A (en) | 2008-12-10 | 2008-12-10 | Water treatment technology |
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| Publication Number | Publication Date |
|---|---|
| CN101759309A true CN101759309A (en) | 2010-06-30 |
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ID=42490715
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810244553A Pending CN101759309A (en) | 2008-12-10 | 2008-12-10 | Water treatment technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102464385A (en) * | 2010-11-15 | 2012-05-23 | 东丽纤维研究所（中国）有限公司 | Integrated coagulation/immersion type membrane filter system |
| CN103030199A (en) * | 2012-12-20 | 2013-04-10 | 中国科学院生态环境研究中心 | Method for filtering water |
| CN108341528A (en) * | 2018-03-01 | 2018-07-31 | 北京市自来水集团有限责任公司技术研究院 | The method that fouling membrane is reduced in the processing method and water treatment procedure of tap water |
| CN110255755A (en) * | 2019-05-28 | 2019-09-20 | 天津城建大学 | For mitigating the integral water treating method of fouling membrane |
| CN112358119A (en) * | 2020-06-30 | 2021-02-12 | 北京工业大学 | Graded micro-flocculation-activated alumina slow filtration-gravity drive type ultrafiltration combined system |
-
2008
- 2008-12-10 CN CN200810244553A patent/CN101759309A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102464385A (en) * | 2010-11-15 | 2012-05-23 | 东丽纤维研究所（中国）有限公司 | Integrated coagulation/immersion type membrane filter system |
| CN102464385B (en) * | 2010-11-15 | 2014-07-30 | 东丽纤维研究所（中国）有限公司 | Integrated coagulation/immersion type membrane filter system |
| CN103030199A (en) * | 2012-12-20 | 2013-04-10 | 中国科学院生态环境研究中心 | Method for filtering water |
| CN108341528A (en) * | 2018-03-01 | 2018-07-31 | 北京市自来水集团有限责任公司技术研究院 | The method that fouling membrane is reduced in the processing method and water treatment procedure of tap water |
| CN110255755A (en) * | 2019-05-28 | 2019-09-20 | 天津城建大学 | For mitigating the integral water treating method of fouling membrane |
| CN112358119A (en) * | 2020-06-30 | 2021-02-12 | 北京工业大学 | Graded micro-flocculation-activated alumina slow filtration-gravity drive type ultrafiltration combined system |
| CN112358119B (en) * | 2020-06-30 | 2023-01-20 | 北京工业大学 | Graded micro-flocculation-activated alumina slow filtration-gravity drive type ultrafiltration combined system |
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Open date: 20100630 |