CN103896431A - Water treatment method combining coagulation-precipitation-re-flocculation-ultrafiltration - Google Patents
Water treatment method combining coagulation-precipitation-re-flocculation-ultrafiltration Download PDFInfo
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- CN103896431A CN103896431A CN201410102865.9A CN201410102865A CN103896431A CN 103896431 A CN103896431 A CN 103896431A CN 201410102865 A CN201410102865 A CN 201410102865A CN 103896431 A CN103896431 A CN 103896431A
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Abstract
The invention belongs to water treatment process methods and particularly relates to a water treatment method combining coagulation-precipitation-re-flocculation-ultrafiltration. The water treatment method comprises the following steps: coagulating sedimentation step; re-flocculation step; ultrafiltration step and the like. The water treatment method combining coagulation-precipitation-re-flocculation-ultrafiltration provided by the invention effectively improves the removal effect of organic matters, wherein the removal rate reaches 50-70% and the removal rate of soluble organic matters reaches 40-60%. Meanwhile, as the organic matters are efficiently removed, membrane pollution can be effectively controlled and reduced and the chemical cleaning period of ultrafiltration membrane equipment can be prolonged, so that the service life of the ultrafiltration membrane equipment is greatly prolonged, thereby further alleviating the operational management difficulty of the water treatment process and lowering the water making cost.
Description
Technical field
The invention belongs to water treatment process method, especially relate to the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling.
Background technology
Develop rapidly and the continuous expansion of scale of urbanization due to industrialized, the contaminated present situation of drinking water sources is increasingly serious, and in water, Organic pollutants can not be ignored.Take remove suspended substance and colloid as main conventional processes (coagulation-precipitation-filtering system) limited to organic removal usefulness in water.When water source is polluted, water quality standard for drinking water improves constantly.In recent years, various countries' water quality standard is also improving constantly.China has also issued through " drinking water sanitary standard " of revision and (GB5749-2006) and has progressively implemented in December, 2006.Compared with old standard, water-quality guideline quantity has had significantly to be increased, and detects index and increases to 106 from 35, and particularly the index of organic compound is increased to 53 from 5, some is had a strong impact on to the index limits of HUMAN HEALTH also stricter simultaneously.For the strict demand of water quality standard, the conventional treatment process of existing water factory is difficult to guarantee stably reaching standard, introduces new technology improvement water technology extremely urgent.
In numerous new type water treatment process, ultrafiltration technology due to have do not need to add the pollutent scope of chemical agent, removal wide, reliable, be easy to realize the advantages such as automatic control, become and improve conventional handling technology of water supply and have one of prospect technique most.Ultra-filtration membrane can all be removed the bacterium in former water, virus, two worms, algae and hydrobiont substantially, is considered to guarantee the effective technology of tap water microbial safety.In recent years, ultrafiltration technology has become one of hot spot technology to water treatment field, and except the ground large-scale application such as North America, Japan, also Kao-hsiung water factory at home, Dongying southern suburbs water factory, Wuxi jackshaft water factory etc. come into operation.But ultra-filtration membrane can not effectively be removed organism, especially very low to dissolved organic matter removal efficiency, therefore must adopt the removal of the front pretreatment technology of effective ultra-filtration membrane with organic matter-water-organic matter in fortified water.
The conventional water technology that relates to ultra-filtration membrane mainly contains at present: (1) former water-coagulation-ultrafiltration-sterilization; (2) former water-coagulation-precipitation-ultrafiltration-sterilization; (3) former water-coagulation-precipitation-gac-ultrafiltration-sterilization; (4) former water-coagulation-precipitation-ozone-biological activity-membrane sepn-sterilization.(1) and (2) although technique has alleviated film load because carried out coagulation, precipitation before film, can play part controlling diaphragm and pollute the effect that the cross-film differential pressure that causes rises, but that these two kinds of techniques can only partly be removed in water organism is especially poor to dissolved organic matter removal effect.(3) and (4) although technique is processed water water quality and film pollutes and control effect and significantly improve than (1) and (2) technique, system complex, flow process is long, invests high and operational management difficulty is larger.Therefore need to propose a kind of can cost-effective removal water in organism guarantee the water treatment method of ultra-filtration membrane steady running.
Summary of the invention
The present invention is directed to above-mentioned deficiency provides a kind of water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling.
The present invention adopts following technical scheme:
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration of the present invention, the device of processing water comprises mixing equipment, flocculation basin, settling tank, reflocculation equipment, device for ultrafiltration membrane, mixing equipment is connected with flocculation basin, flocculation basin is connected with settling tank, settling tank is connected with reflocculation equipment, and reflocculation equipment is connected with device for ultrafiltration membrane.Pending water is through having formed a large amount of flcos after coagulation for the first time, then after precipitation process, removed partial organic substances and most suspended substances and colloid.In the water outlet after coagulation-precipitation process, add certain coagulating agent, thereby utilize suspended substance remaining in water and colloid to take off for the second time surely, condense and form small flco (being reflocculation) and the organism in water is combined as flocculation core, then utilize the good cutoff performance of ultra-filtration membrane that the flco of being combined with organism is held back, thereby further remove organism and remove remaining suspended substance and colloid simultaneously.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, its step of processing water is as follows:
1), coagulating sedimentation step: enter mixing equipment after pending water dosing coagulant, mixed water enters flocculation basin flocculation, and the water after flocculation enters settling tank and precipitates;
2), reflocculation step: by above-mentioned steps 1) coagulating sedimentation water outlet after treatment sends into reflocculation equipment after dosing coagulant again;
3), ultrafiltration step: above-mentioned steps 2) reflocculation water outlet after treatment sends into device for ultrafiltration membrane and filters.
4), by above-mentioned steps 3) in device for ultrafiltration membrane water after treatment send into clean water basin, after sterilization, enter the distribution system of water supply.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, the mixing equipment in coagulation step can be realized for tubular static mixer or diffusion mixer or mechanically mixing pond or other equipment of coagulating agent and water Quick uniform mixing effect.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, the flocculation basin in coagulation step can be grid flocculation or folded plate flocculator or dividing plate flocculation basin or mechanical flocculation basin;
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, settling tank can be rectangular sedimentation tank or tube settler or inclined-plate clarifying basin.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, wherein coagulation-settling step also can adopt the settling pond that integrates coagulation and precipitation function to replace, and comprises accelerator or circulatior clarifier or plusator or sludge blanket clarifier etc.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, wherein then reflocculation process realizes through reflocculation equipment by dosing coagulant in the water outlet after coagulation-precipitation process.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, device for ultrafiltration membrane can be that inner pressed device for ultrafiltration membrane can be also external pressure type ultra-filtration membrane equipment.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, its coagulating agent adding before reflocculation equipment can be Tai-Ace S 150 or polymerize aluminum chloride or iron trichloride or bodied ferric sulfate, the coagulant charging quantity of optimization is 5 ~ 15mg/L.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, wherein reflocculation equipment is made up of mixing equipment and two parts of flocculation apparatus.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, mixing equipment in reflocculation equipment generally adopts tubular static mixer, also can adopt diffusion mixer or orifice mixer or mechanically mixing pond or other can realize the equipment of coagulating agent and water Quick uniform mixing effect.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, the flocculation apparatus in reflocculation equipment is generally mechanical flocculation basin, can be also grid flocculation or folded plate flocculator or dividing plate flocculation basin; The flocculation time of optimizing is 1 ~ 3min, and the flocculating strength of optimization is take velocity slope measurement as 15 ~ 30s
-1.
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention, especially in the time that ultrafiltration apparatus adopts immerseable external pressure device for ultrafiltration membrane, in the time that ultra-filtration membrane membrane cisterna can play the throwing out suitable with flocculation apparatus, can save the flocculation apparatus in reflocculation process, thereby simplify water treatment technological process.
Beneficial effect
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling provided by the invention, has improved effectively to organic removal effect, and its clearance reaches 50%～70%, and wherein dissolved organic matter clearance reaches 40%～60%; Simultaneously due to organic efficient removal, can effectively control and reduce film pollutes, thereby the matting cycle that has extended device for ultrafiltration membrane extends the work-ing life of device for ultrafiltration membrane greatly, and then alleviate the operational management difficulty of water technology and reduce water producing cost.
The present invention can be applicable to the process field of all kinds of surface water and micro-polluted source water.The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling provided by the invention can be used for newly-built water factory, also can be applicable to transformation, the enlarging of original water factory, has higher economic benefit.
Accompanying drawing explanation
Fig. 1 inner pressed device for ultrafiltration membrane process flow sheet;
Fig. 2 is immerseable external pressure device for ultrafiltration membrane process flow sheet.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in more detail:
A water treatment method for coagulation-precipitation-reflocculation-ultrafiltration coupling, the method is specifically related to the step of following order:
(1) coagulation
Adopt liquid aluminium sulfate as coagulating agent, adopt METERING DIAPHRAGM PUMPS to add Tai-Ace S 150 to former water, add the short mix that water after Tai-Ace S 150 enters tubular static mixer and carry out itself and former water, after mixing, water enters folded plate flocculator and flocculates, the flocs unit that formation can sedimentation.The dosage of Tai-Ace S 150 should regulate according to the former water water yield and water quality, and should to make post precipitation pond delivery turbidity be 1 ~ 3NTU, generally coagulant charging quantity 10 ~ 30mg/L.Folded plate flocculator flocculation time is 15min, and average velocity gradient is 32s
-1.
(2) precipitation
After step 1), flocculation basin water outlet enters tube settler, and flocs unit is deposited to settling tank bottom under action of gravity, thereby removes partial organic substances and most suspended substance and particulate matter in water.Settling tank delivery turbidity is controlled at 1 ~ 3NTU, and sludge discharging period is 6h, and settling tank surface load is 6.2m
3/ (m
2h).
(3) reflocculation
A. in the present embodiment, what after reflocculation, connect is immerseable external pressure ultrafiltration membrane system, because current flowing in membrane cisterna can reach the throwing out suitable with flocculation apparatus, therefore save the flocculation apparatus in reflocculation equipment in the present embodiment.Adopt METERING DIAPHRAGM PUMPS to step 2) enter tubular static mixer after adding Tai-Ace S 150 in water outlet, complete Tai-Ace S 150 and mix with the Quick uniform of water.Enter external pressure type ultra-filtration membrane membrane cisterna through mixed water, utilize mobile the complete reflocculation process of current in membrane cisterna.In the present embodiment, in reflocculation process, the dosage of Tai-Ace S 150 is 6mg/L.
B. in the present embodiment, what after reflocculation, connect is inner pressed ultrafiltration membrane system, and reflocculation facility is tubular static mixer and mechanical flocculation basin.Adopt METERING DIAPHRAGM PUMPS to step 2) enter tubular static mixer after adding Tai-Ace S 150 in water outlet, complete Tai-Ace S 150 and mix with the Quick uniform of water.Enter mechanical flocculation basin through mixed water, flocculation time 3min, flocculating strength is take velocity slope measurement as 15s
-1, in mechanical flocculation basin, completing reflocculation process, the water after reflocculation enters inner pressed ultra-filtration membrane.In the present embodiment, in reflocculation process, the dosage of Tai-Ace S 150 is 6mg/L.
(4) ultrafiltration
A. the device for ultrafiltration membrane adopting in the present embodiment is immersion external pressure polysulfone hollow fiber ultrafiltration membrane system.Ultra-filtration membrane flux is 30L/ (m
2h), the ultra-filtration membrane cycle of operation is 60min.The backwash mode of ultra-filtration membrane is: first aeration is cleaned 40 seconds, and aeration intensity is 18 m
3/ (m
2h); Then carry out air water and combine flushing, flush time is 60s, and aeration intensity is 18m
3/ (m
2h), water backwash rate is 60L/ (m
2h).
B. originally executing the device for ultrafiltration membrane adopting in example is inner pressed polysulfone hollow fiber ultrafiltration membrane system.Ultra-filtration membrane flux is 20L/ (m
2h), the ultra-filtration membrane cycle of operation is 90min.The back flushing of ultra-filtration membrane comprises backwash and two steps of lower backwash.Upper backwash: generally adopt ultrafiltration to produce water as back-flushing, produce the mouth of a river enter by assembly, dense water out flows out.Now water inlet is closed, water (flow) direction with produce when water contrary.Residual pollutent in fenestra and film surface can be taken out of to membrane module by backwash.This process oppositely sees through the water on film surface and discharges from film pipe top, better to the developing result on top-film surface.The upper backwash time is 10 seconds, and water backwash rate is 60L/ (m
2h).Lower backwash: this process oppositely sees through the water on film surface and discharges from film pipe bottom, better to the developing result on bottom film surface.30 seconds lower backwash time, water backwash rate is 60L/ (m
2h).
The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling of the present invention and the contrast of other common ultrafiltration combination process treatment effect:
From above result, the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling, for turbidity, organism (particularly dissolved organic matter), all has good removal effect, far above coagulation-ultrafiltration technique and coagulation-precipitation-ultrafiltration.The water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling is lower slightly to organic clearance, but method provided by the present invention is simple, do not need the large-scale water treatment design such as newly-built ozonizer, ozone contact tank, gac pond, cost of investment is low above-mentioned two kinds of methods far away.
Claims (6)
1. the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling, the device of processing water comprises mixing equipment, flocculation basin, settling tank, reflocculation equipment, device for ultrafiltration membrane; Mixing equipment is connected with flocculation basin, and flocculation basin is connected with settling tank, and settling tank is connected with reflocculation equipment, and reflocculation equipment is connected with device for ultrafiltration membrane; The step that it is characterized in that water treatment is as follows:
1), coagulating sedimentation step: enter mixing equipment after pending water dosing coagulant, mixed water enters flocculation basin flocculation, and the water after flocculation enters settling tank to carry out solid-liquid and divide separation;
2), reflocculation step: by above-mentioned steps 1) coagulating sedimentation water outlet after treatment sends into reflocculation equipment after dosing coagulant again;
3), ultrafiltration step: above-mentioned steps 2) water outlet after treatment sends in device for ultrafiltration membrane and filters;
4), by above-mentioned steps 3) in device for ultrafiltration membrane water after treatment send into clean water basin, after sterilization, enter the distribution system of water supply.
2. the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling according to claim 1, is characterized in that: reflocculation process is by realizing through reflocculation equipment after dosing coagulant in the water outlet after coagulation-precipitation.
3. the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling according to claim 1, is characterized in that: device for ultrafiltration membrane can be inner pressed device for ultrafiltration membrane or external pressure type ultra-filtration membrane equipment.
4. the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling according to claim 2, it is characterized in that: the coagulating agent adding in reflocculation process is Tai-Ace S 150 or polymerize aluminum chloride or iron trichloride or bodied ferric sulfate, and its dosage is generally 5 ~ 15mg/L.
5. the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling according to claim 2, is characterized in that: in reflocculation process, mixing equipment adopts tubular static mixer or adopts diffusion mixer or orifice mixer or mechanically mixing pond.
6. the water treatment method of coagulation-precipitation-reflocculation-ultrafiltration coupling according to claim 2, described flocculation apparatus is mechanical flocculation basin, or grid flocculation or folded plate flocculator or dividing plate flocculation basin; General 1 ~ the 3min that adopts of flocculation time, flocculating strength is take velocity slope measurement as 15 ~ 30s
-1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104724855A (en) * | 2015-03-26 | 2015-06-24 | 中国华电工程(集团)有限公司 | Joint micro flocculation and ultrafiltration water treatment method and system of low-temperature and low-turbidity water |
| CN106430707A (en) * | 2016-09-28 | 2017-02-22 | 武汉万安环保工程技术有限公司 | Skid-mounted system used for treating oily sewage |
| CN106830427A (en) * | 2017-03-03 | 2017-06-13 | 济南大学 | A kind of short distance coagulating sedimentation and the efficient joint water treatment technology for filtering |
| CN112093996A (en) * | 2020-09-28 | 2020-12-18 | 中国科学院生态环境研究中心 | Constructed wetland-coagulation combined pretreatment ultrafiltration water supply treatment system and water treatment method |
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| CN101381113A (en) * | 2008-08-29 | 2009-03-11 | 北京桑德环保集团有限公司 | Filtration processing system and processing method of water supply plant |
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2014
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101381113A (en) * | 2008-08-29 | 2009-03-11 | 北京桑德环保集团有限公司 | Filtration processing system and processing method of water supply plant |
Non-Patent Citations (1)
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| 罗旺兴等: "二次在线混凝对浸没式超滤膜性能的影响", 《中国给水排水》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104724855A (en) * | 2015-03-26 | 2015-06-24 | 中国华电工程(集团)有限公司 | Joint micro flocculation and ultrafiltration water treatment method and system of low-temperature and low-turbidity water |
| CN106430707A (en) * | 2016-09-28 | 2017-02-22 | 武汉万安环保工程技术有限公司 | Skid-mounted system used for treating oily sewage |
| CN106830427A (en) * | 2017-03-03 | 2017-06-13 | 济南大学 | A kind of short distance coagulating sedimentation and the efficient joint water treatment technology for filtering |
| CN112093996A (en) * | 2020-09-28 | 2020-12-18 | 中国科学院生态环境研究中心 | Constructed wetland-coagulation combined pretreatment ultrafiltration water supply treatment system and water treatment method |
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Application publication date: 20140702 |