CN104724855A - Joint micro flocculation and ultrafiltration water treatment method and system of low-temperature and low-turbidity water - Google Patents
Joint micro flocculation and ultrafiltration water treatment method and system of low-temperature and low-turbidity water Download PDFInfo
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- CN104724855A CN104724855A CN201510134941.9A CN201510134941A CN104724855A CN 104724855 A CN104724855 A CN 104724855A CN 201510134941 A CN201510134941 A CN 201510134941A CN 104724855 A CN104724855 A CN 104724855A
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Abstract
The invention discloses a joint micro flocculation and ultrafiltration water treatment method and system of low-temperature and low-turbidity water. The specific treatment method comprises three steps of flocculation, filtration and disinfection. The used system comprises mixing equipment (1), a flocculation basin (2), a filter (3), ultrafiltration membrane equipment (4) and a contact disinfecting tank (5), which are connected in sequence. The joint micro flocculation and ultrafiltration water treatment method and system disclosed by the invention can be used for effectively reducing the concentration of pollutants in water, prolonging the service life of the ultrafiltration membrane, relieving the operation and management difficulty of the water treatment process and lowering the water production cost.
Description
Technical field
The present invention relates to a kind of tiny flocculation ultrafiltration coupling water supply treatment process and system of low temperature and low turbidity water, belong to water-treatment technology field.
Background technology
In December, 2006, China has promulgated new " drinking water sanitary standard " (GB5749-2006) and has progressively implemented, and compared with old plant water-quality guideline (GB5749-1985), water-quality guideline expands 106 to from 35.In new standard, microbiological indicator increases to 6 by 2, drinking water disinfect increases to 4 by 1, in toxicological parameters, mineral compound increases to 21 by 10, in toxicological parameters, organic compound increases to 53 by 5, sensory properties and general chemical index increase to 20 by 15, and adjustment member specifies and adds annex and reference etc.According to new standard, traditional handling technology of water supply is difficult to satisfied strict drinking-water quality requirement, introduces New Technologies imperative.
Low temperature and low turbidity water be water temperature at about 4 DEG C, turbidity is the upper and lower water of 20NTU.Northern China take river as the water factory at water source, and there are the freezeup period reaching 5 ~ 6 months in annual October to next year 3, April, period source quality have that water temperature is low, turbidity is low, the problem of organic contamination aggravation.At present, the water supply plant of China adopts traditional coagulating sedimentation filter-sterilized four segment process mostly, but traditional technology is during low-temperature and low turbidity, coagulating sedimentation weak effect, even if it is also of no avail to strengthen medicine consumption, settling tank delivery turbidity even can be caused sometimes higher than influent turbidity.
Membrane separation technique has that efficiency is high, energy consumption is low, technique is simple, facility compact, filtering safe, the advantage such as pollution-free, to be widely deployed and application is in water treatment field, to be called as " water technology of 21st century ".At present, along with the development of membrane science technology, membrane separation technique is successfully applied in drink water purifying process field.According to having been reported, except except the ground large-scale application such as North America, Japan, also Kao-hsiung water factory, Dongying southern suburbs water factory, Wuxi jackshaft water factory etc. at home comes into operation.Ultra-filtration membrane can remove whole bacteriums in former water, virus, two worms, algae, hydrobiont substantially, and colloid, suspended substance.But can not the effective dissolubility pollutant such as separation of organic substances, effective pretreatment technology and ultra-filtration membrane coupling therefore must be adopted to strengthen the removal of Organic substance in water etc.
Summary of the invention
The object of the invention is to, a kind of tiny flocculation ultrafiltration coupling water supply treatment process and system of low temperature and low turbidity water are provided, it effectively can reduce the concentration of water pollutant, extends the work-ing life of ultra-filtration membrane, alleviates the operational management difficulty of water technology and reduces water producing cost.
Technical scheme of the present invention: a kind of tiny flocculation ultrafiltration coupling water supply treatment process of low temperature and low turbidity water, comprises the following steps:
Step a, flocculation, adds flocculation agent in the former water of low-temperature and low turbidity, and make suspended particle form aggregate after mixing, aggregate produces throw out by flocculation reaction, then filters;
Step b, filter, water outlet removes suspended substance, colloid, microorganism and polymer substance by device for ultrafiltration membrane;
Step c, sterilization, ultra-filtration water enters disinfecting tank, and after adding sterilizing agent, water outlet enters water supply network.Former water is after mixing, flocculation, precipitation and filtration, substantially can remove the bacterium in former water, virus, two worms and algae etc., but in order to ensure tap water Bacteriological Indexes, eliminate the pathogenic microorganism in water completely, anti-sealing causes the harm of transmissible disease, therefore adds sterilizing agent in disinfecting tank.
In the tiny flocculation ultrafiltration coupling water supply treatment process of aforesaid low temperature and low turbidity water, in described step a, when flocculating, hydraulic detention time is 2min ~ 8min, and velocity gradient g value is 15S
-1~ 50S
-1.G value refers to velocity slope, and according to theory of flocculation in the same way, owing to there is velocity contrast, the particle of adjacent water layer could collide, be the parameter of reaction stirring intensity, unit time endocorpuscular collision frequency in indirect reaction unit volume.
In the tiny flocculation ultrafiltration coupling water supply treatment process of aforesaid low temperature and low turbidity water, in described step a, when flocculating, hydraulic detention time is 5min, and velocity gradient g value is 40S
-1.
In the tiny flocculation ultrafiltration coupling water supply treatment process of aforesaid low temperature and low turbidity water, the flocculation agent added is polymerize aluminum chloride, and dosage is 5mg/L ~ 15mg/L.
In the tiny flocculation ultrafiltration coupling water supply treatment process of aforesaid low temperature and low turbidity water, the flocculation agent added is polymerize aluminum chloride, and dosage is 8mg/L ~ 10mg/L.
In the tiny flocculation ultrafiltration coupling water supply treatment process of aforesaid low temperature and low turbidity water, the flocculation agent added is polymerize aluminum chloride, and dosage is 9mg/L.
Realize a system for the tiny flocculation ultrafiltration coupling water supply treatment process of aforementioned low temperature and low turbidity water, comprise connect in turn mixing equipment, flocculation basin, filter tank, device for ultrafiltration membrane and disinfecting tank.
In the tiny flocculation ultrafiltration coupling water supply treatment system of aforesaid low temperature and low turbidity water, mixing equipment adopts mechanically mixing pond, tubular static mixer, diffusion mixer or orifice mixer.
In the tiny flocculation ultrafiltration coupling water supply treatment system of aforesaid low temperature and low turbidity water, flocculation basin is mechanical flocculation basin, grid flocculation, folded plate flocculator or dividing plate flocculation basin.
In the tiny flocculation ultrafiltration coupling water supply treatment system of aforesaid low temperature and low turbidity water, filter tank is conventional rapid filter, siphon filter, contact double-bed filter or valveless filtering pool.
In the tiny flocculation ultrafiltration coupling water supply treatment system of aforesaid low temperature and low turbidity water, be filled with filtrate in described filter tank, filtrate adopts hard coal, quartz sand double-layer filter material or individual layer quartz sand filter media.
In the tiny flocculation ultrafiltration coupling water supply treatment system of aforesaid low temperature and low turbidity water, device for ultrafiltration membrane adopts pressure type hollow fiber film assembly, the membrane pore size≤0.03um of pressure type hollow fiber film assembly.
Compared with prior art, the present invention is directed to the feature of raw water quality low-temperature and low turbidity, provide a kind of tiny flocculation ultrafiltration coupling water supply treatment system and method.The advantage of this technique and system is the throwing out utilizing flocculation agent, the efficient concentration reducing water pollutant; Especially organic efficient removal can control and reduce the film surface degree of compactness of cake layer and thickness to carry out controlling diaphragm and pollute, thus extend the matting cycle of ultra-filtration membrane, greatly extend the work-ing life of ultra-filtration membrane, and then alleviate the operational management difficulty of water technology and reduce water producing cost.
Accompanying drawing explanation
Fig. 1 is system flowchart of the present invention.
Being labeled as in accompanying drawing: 1-mixing equipment, 2-flocculation basin, 3-filter tank, 4-device for ultrafiltration membrane, 5-disinfecting tank, 6-flocculation agent, the former water of 7-.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
Embodiments of the invention 1: a kind of tiny flocculation ultrafiltration coupling water supply treatment process of low temperature and low turbidity water, comprises the following steps:
Step a, flocculation, METERING DIAPHRAGM PUMPS is utilized to add flocculation agent in the former water of low-temperature and low turbidity, flocculation agent adopts polymerize aluminum chloride, former water after adding enters tubular static mixer, the two short mix in tubular static mixer, makes suspended particle form aggregate after mixing, aggregate produces throw out by flocculation reaction, then filters; Generally the dosage of flocculant poly aluminum chloride is 9mg/L, and flocculation time is 5min, and average velocity gradient is 40S
-1.
Step b, filter, the water outlet after step a enters filter tank, and flocs unit is trapped removal under filter material layer crown_interception.Generally filtering velocity is 8m/h ~ 14m/h.Then enter ultrafiltration membrane system, utilize ultra-filtration membrane to remove the residue flco be combined with organism, and retain whole suspended substance, colloid, microorganism and polymer substance.
Step c, sterilization, ultra-filtration water enters disinfecting tank, and after adding sterilizing agent, water outlet enters water supply network.
In a kind of system of the tiny flocculation ultrafiltration coupling water supply treatment process realizing aforementioned low temperature and low turbidity water, as shown in Figure 1, comprise connect in turn mixing equipment 1, flocculation basin 2, filter tank 3, device for ultrafiltration membrane 4 and disinfecting tank 5.
Mixing equipment 1 adopts mechanically mixing pond, and flocculation basin 2 is mechanical flocculation basin, and filter tank 3 is conventional rapid filter, is filled with filtrate in filter tank 3, and filtrate adopts hard coal; Device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, and its internal diameter is 1.0mm, and external diameter is 1.66mm, membrane area 40m
2, membrane pore size≤0.03um, molecular weight cut-off is 100ku.Dead-end filtration, membrane flux is 73L/ (m
2h), cycle of operation 30min, backwash intensity is 15m
3/ h, the backwash time is 1 ~ 1.5min, and the matting cycle is 1 ~ 2 month.
Embodiments of the invention 2: a kind of tiny flocculation ultrafiltration coupling water supply treatment process of low temperature and low turbidity water, comprises the following steps:
Step a, flocculation, METERING DIAPHRAGM PUMPS is utilized to add flocculation agent in the former water of low-temperature and low turbidity, flocculation agent adopts polymerize aluminum chloride, former water after adding enters tubular static mixer, the two short mix in tubular static mixer, makes suspended particle form aggregate after mixing, aggregate produces throw out by flocculation reaction, then filters; Generally the dosage of flocculant poly aluminum chloride is 5mg/L, and flocculation time is 2min, and average velocity gradient is 15S
-1.
Step b, filter, the water outlet after step a enters filter tank, and flocs unit is trapped removal under filter material layer crown_interception.Generally filtering velocity is 8m/h ~ 14m/h.Then enter ultrafiltration membrane system, utilize ultra-filtration membrane to remove the residue flco be combined with organism, and retain whole suspended substance, colloid, microorganism and polymer substance.
Step c, sterilization, ultra-filtration water enters disinfecting tank, and after adding sterilizing agent, water outlet enters water supply network.
In a kind of system of the tiny flocculation ultrafiltration coupling water supply treatment process realizing aforementioned low temperature and low turbidity water, as shown in Figure 1, comprise connect in turn mixing equipment 1, flocculation basin 2, filter tank 3, device for ultrafiltration membrane 4 and disinfecting tank 5.
Mixing equipment 1 adopts tubular static mixer, and flocculation basin 2 is grid flocculation, and filter tank 3 is siphon filter, is filled with filtrate in filter tank 3, and filtrate adopts quartz sand double-layer filter material.Device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, and device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, and its internal diameter is 1.0mm, and external diameter is 1.66mm, membrane area 40m
2, membrane pore size≤0.03um, molecular weight cut-off is 100ku.Dead-end filtration, membrane flux is 73L/ (m
2h), cycle of operation 30min, backwash intensity is 15m
3/ h, the backwash time is 1 ~ 1.5min, and the matting cycle is 1 ~ 2 month.
Embodiments of the invention 3: a kind of tiny flocculation ultrafiltration coupling water supply treatment process of low temperature and low turbidity water, comprises the following steps:
Step a, flocculation, METERING DIAPHRAGM PUMPS is utilized to add flocculation agent in the former water of low-temperature and low turbidity, flocculation agent adopts polymerize aluminum chloride, former water after adding enters tubular static mixer, the two short mix in tubular static mixer, makes suspended particle form aggregate after mixing, aggregate produces throw out by flocculation reaction, then filters; Generally the dosage of flocculant poly aluminum chloride is 15mg/L, and flocculation time is 8min, and average velocity gradient is 50S
-1.
Step b, filter, the water outlet after step a enters filter tank, and flocs unit is trapped removal under filter material layer crown_interception.Generally filtering velocity is 8m/h ~ 14m/h.Then enter ultrafiltration membrane system, utilize ultra-filtration membrane to remove the residue flco be combined with organism, and retain whole suspended substance, colloid, microorganism and polymer substance.
Step c, sterilization, ultra-filtration water enters disinfecting tank, and after adding sterilizing agent, water outlet enters water supply network.
In a kind of system of the tiny flocculation ultrafiltration coupling water supply treatment process realizing aforementioned low temperature and low turbidity water, as shown in Figure 1, comprise connect in turn mixing equipment 1, flocculation basin 2, filter tank 3, device for ultrafiltration membrane 4 and disinfecting tank 5.
Mixing equipment 1 adopts diffusion mixer, and flocculation basin 2 is folded plate flocculator, and filter tank 3 is contact double-bed filter, and be filled with filtrate in filter tank 3, filtrate adopts individual layer quartz sand filter media.Device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, and device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, and device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, and its internal diameter is 1.0mm, and external diameter is 1.66mm, membrane area 40m
2, membrane pore size≤0.03um, molecular weight cut-off is 100ku.Dead-end filtration, membrane flux is 73L/ (m
2h), cycle of operation 30min, backwash intensity is 15m
3/ h, the backwash time is 1 ~ 1.5min, and the matting cycle is 1 ~ 2 month.
Embodiments of the invention 4: a kind of tiny flocculation ultrafiltration coupling water supply treatment process of low temperature and low turbidity water, comprises the following steps:
Step a, flocculation, METERING DIAPHRAGM PUMPS is utilized to add flocculation agent in the former water of low-temperature and low turbidity, flocculation agent adopts polymerize aluminum chloride, former water after adding enters tubular static mixer, the two short mix in tubular static mixer, makes suspended particle form aggregate after mixing, aggregate produces throw out by flocculation reaction, then filters; Generally the dosage of flocculant poly aluminum chloride is 5 ~ 15mg/L, and flocculation time is 5min, and average velocity gradient is 40S
-1.
Step b, filter, the water outlet after step a enters filter tank, and flocs unit is trapped removal under filter material layer crown_interception.Generally filtering velocity is 8m/h ~ 14m/h.Then enter ultrafiltration membrane system, utilize ultra-filtration membrane to remove the residue flco be combined with organism, and retain whole suspended substance, colloid, microorganism and polymer substance.
Step c, sterilization, ultra-filtration water enters disinfecting tank, and after adding sterilizing agent, water outlet enters water supply network.
In a kind of system of the tiny flocculation ultrafiltration coupling water supply treatment process realizing aforementioned low temperature and low turbidity water, as shown in Figure 1, comprise connect in turn mixing equipment 1, flocculation basin 2, filter tank 3, device for ultrafiltration membrane 4 and disinfecting tank 5.
Mixing equipment 1 adopts orifice mixer, and flocculation basin 2 is dividing plate flocculation basin, and filter tank 3 is valveless filtering pool, is filled with filtrate in filter tank 3, and filtrate adopts individual layer quartz sand filter media.Device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, device for ultrafiltration membrane 4 adopts pressure type hollow fiber film assembly, its internal diameter is 1.0mm, external diameter is 1.66mm, membrane area 40m
2, membrane pore size≤0.03um, molecular weight cut-off is 100ku.Dead-end filtration, membrane flux is 73L/ (m
2h), cycle of operation 30min, backwash intensity is 15m
3/ h, the backwash time is 1 ~ 1.5min, and the matting cycle is 1 ~ 2 month.
Claims (10)
1. a tiny flocculation ultrafiltration coupling water supply treatment process for low temperature and low turbidity water, is characterized in that: comprise the following steps:
Step a, flocculation, adds flocculation agent in the former water of low-temperature and low turbidity, and make suspended particle form aggregate after mixing, aggregate produces throw out by flocculation reaction, then filters;
Step b, filter, water outlet removes suspended substance, colloid, microorganism and polymer substance by device for ultrafiltration membrane;
Step c, sterilization, ultra-filtration water enters disinfecting tank, and after adding sterilizing agent, water outlet enters water supply network.
2. the tiny flocculation ultrafiltration coupling water supply treatment process of a kind of low temperature and low turbidity water according to claim 1, is characterized in that: in described step a, and when flocculating, hydraulic detention time is 2min ~ 8min, and velocity gradient g value is 15S
-1~ 50S
-1.
3. the tiny flocculation ultrafiltration coupling water supply treatment process of a kind of low temperature and low turbidity water according to claim 1 and 2, it is characterized in that: the flocculation agent added is polymerize aluminum chloride, dosage is 5mg/L ~ 15mg/L.
4. the tiny flocculation ultrafiltration coupling water supply treatment process of a kind of low temperature and low turbidity water according to claim 3, it is characterized in that: the flocculation agent added is polymerize aluminum chloride, dosage is 9mg/L.
5. realize a system for the tiny flocculation ultrafiltration coupling water supply treatment process of low temperature and low turbidity water described in any one in Claims 1 to 4, it is characterized in that: comprise connect in turn mixing equipment (1), flocculation basin (2), filter tank (3), device for ultrafiltration membrane (4) and disinfecting tank (5).
6. the tiny flocculation ultrafiltration coupling water supply treatment system of a kind of low temperature and low turbidity water according to claim 5, is characterized in that: mixing equipment (1) adopts mechanically mixing pond, tubular static mixer, diffusion mixer or orifice mixer.
7. the tiny flocculation ultrafiltration coupling water supply treatment system of a kind of low temperature and low turbidity water according to claim 5 or 6, is characterized in that: flocculation basin (2) is mechanical flocculation basin, grid flocculation, folded plate flocculator or dividing plate flocculation basin.
8. the tiny flocculation ultrafiltration coupling water supply treatment system of a kind of low temperature and low turbidity water according to claim 7, is characterized in that: filter tank (3) are conventional rapid filter, siphon filter, contact double-bed filter or valveless filtering pool.
9. the tiny flocculation ultrafiltration coupling water supply treatment system of a kind of low temperature and low turbidity water according to claim 8, is characterized in that: described filter tank is filled with filtrate in (3), and filtrate adopts hard coal, quartz sand double-layer filter material or individual layer quartz sand filter media.
10. the tiny flocculation ultrafiltration coupling water supply treatment system of a kind of low temperature and low turbidity water according to claim 9, it is characterized in that: device for ultrafiltration membrane (4) adopts pressure type hollow fiber film assembly, the membrane pore size≤0.03um of pressure type hollow fiber film assembly.
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Cited By (2)
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Effective date of registration: 20160913 Address after: 100160 Fengtai District Beijing Automobile Museum Road, No. 6, Ying Kun century A block, floor 11 Applicant after: Huadian Water Engineering Co., Ltd. Address before: 100160 Beijing, Fengtai District Automobile Museum Road, No. 6, Ying Kun century A block, floor 11 Applicant before: CHINA HUADIAN ENGINEERING CO., LTD. Applicant before: Huadian Water Engineering Co., Ltd. |
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Application publication date: 20150624 |