CN104098209A - Combined process and device for treating slightly polluted water - Google Patents
Combined process and device for treating slightly polluted water Download PDFInfo
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- CN104098209A CN104098209A CN201410342465.5A CN201410342465A CN104098209A CN 104098209 A CN104098209 A CN 104098209A CN 201410342465 A CN201410342465 A CN 201410342465A CN 104098209 A CN104098209 A CN 104098209A
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Abstract
The invention relates to a combined process and a device for treating slightly polluted water. The device comprises a raw water tank, a water pump, a pH (potential of hydrogen) adjusting tank, a stirring device, an electrocoagulation tank, an automatic phase-change pulsed power supply, a settling pond, a hollow fiber ultrafiltration membrane assembly and a clear water tank, wherein a plurality of electrode plates are arranged in the electrocoagulation tank and connected with the automatic phase-change pulsed power supply, the pH adjusting tank is connected with the raw water tank through the water pump, the electrocoagulation tank is connected with an inlet of the pH adjusting tank through the water pump and connected with the settling pond which is connected with a water inlet of the hollow fiber ultrafiltration membrane assembly through the water pump, and the hollow fiber ultrafiltration membrane assembly is connected with the clear water tank. According to the process and the device, respective advantages of electrocoagulation and ultrafiltration technologies are organically combined, and a combined process for treating the slightly polluted water is formed; the process and the device have the advantages of simple process, small occupied space, high stability, no secondary pollution and the like; the problem of high probability of pollution on a membrane in a conventional ultrafiltration process is solved; and meanwhile, various pollutants such as organic matters, nitrogen, phosphorus and the like are removed, and the removal effect is superior to a conventional chemical method and biological method.
Description
Technical field
The invention belongs to water pollution control field, relate to a kind of combination process and device of processing micro-polluted water.
Background technology
In recent years, in city, undressed trade effluent and sanitary sewage enter water body, cause water body persistence to pollute, and make some drinking water sources become micropollutant water.The organic pollutant that contains a variety of trace in these micropollutant waters, though its concentration is not high, but mostly is hazardous contaminant, even has teratogenesis, carcinogenic and suspicious carcinogenic effect, very big to human health damage; Nitrogen and phosphorus pollution in water body is on the rise simultaneously, makes the water bodys such as lake, river occur eutrophication in various degree, causes the excessive breeding of Measures of Algae in Water Body, and water treatment has been produced to multiple negative impact.
And the target of current conventional drinking water treatment mainly concentrates on the removal of turbidity and particulate matter, limited to organic clearance, lower for the organic removal rate of small molecules amount.Produced in this case many drinking water purifiers, its Main Means is to utilize gac or activated carbon fiber to adsorb.And gac is all bad with the organic removal effect that is less than 1000 for being greater than 3000.
Traditional chemical method, dosage is large, and expense is high, and can increase the content of muriate, vitriol etc. in water, makes water quality taste deterioration, also lower to the clearance of the organism in water and ammonia nitrogen.
Traditional biological process, can remove the organism of 60% left and right, and running cost is low, but floor space is large, invests highly, and the residence time is long, not manageability.
The method that visible tradition is single cannot meet the processing requirements of micro-polluted water, high in the urgent need to removal efficiency, invest micro-pollution problem that little combination process solves water source.
Membrane filtration technique is competitive new type water treatment process, utilizes and has the film of selecting perviousness, under certain external driving force effect, makes solute and the solute in solution, solute and separated from solvent, the object that reach purification, concentrates and purify.Compare with traditional technology, ultrafiltration technology has the effect of good removal turbidity and pathogenic micro-organism, but not high to nitrogen, phosphorus and organic clearance, and in water, organism can cause the pollution of film again, causes process costs to increase.Therefore, ultra-filtration technique needs with other process combination, micro-polluted water to be processed.
Electrocoagulation technology is a kind of eco-friendly water technology.Electrocoagulation carries out the weak point that pre-treatment can make up ultrafiltration, and it can remove nitrogen phosphorus and organism effectively, has slowed down the pollution of film simultaneously.
At present, take the research in water treatment of combination process that ultra-filtration technique is core also more and more.As coagulation-ultrafiltration combination process is widely applied in drinking water treatment, but adding in a large number not only of chemical coagulator can increase cost, also can cause secondary pollution; Although absorption-ultrafiltration combination process has improved organic clearance, very micro-to the nitrogen phosphorus removal effect in water; Biology-ultrafiltration combination process also has higher clearance to organism, but moves after for some time, and the amount reproduction of bacterium can make subsequent film assembly produce microbial contamination.Visible in actual application process, the phenomenon of film pollution grows worse still there will be.In addition, also there is the water treatment patent that some electrocoagulation-ultrafiltration are relevant, as treating oil extraction waste water by coagulation-electrocoagulation-ultrafiltration method device (application number: the leather-making waste water recycling device (application number: 201110044405.1) 200810012266.2) with based on electrochemistry and ultrafiltration, it is processed object and is respectively and recovers the oil and the process hides water such as give up, therefore at treating processes meeting dosing coagulant, if and such device is applied in the processing of micro-polluted water, seem too complicated, increased unnecessary cost and dropped into.
Therefore in Practical Project, should require and field condition according to raw water quality, effluent quality, determine the combination process of economization and environmental friendliness, simplification device as far as possible, gives full play to the advantage of each cell process, reaches the complementary effect promoting.
Summary of the invention
The object of the invention is the deficiency existing on existing micro-polluted water treatment technology, electrocoagulation and ultra-filtration technique are combined, form a kind of combination process that thing is wide, clearance is high, micro-polluted water easy and simple to handle, non-secondary pollution is processed of removing.
The combination unit of the processing micro-polluted water that the present invention proposes, this device comprises former pond 1, pH regulator pond 3, whipping appts 4, electrocoagulation groove 5, automatic commutator pulse power supply 7, settling tank 8, polysulfone hollow fiber ultrafiltration membrane system 9 and clean water basin 10, wherein: in described electrocoagulation groove 5, be provided with some electrode plate 6, automatically commutator pulse power supply 7 output ports are joined by wire and the battery lead plate 6 that is arranged in electrocoagulation groove 5, pH regulator pond 3 water inlets join by water pump and former pond 1 water outlet, electrocoagulation groove 5 water inlets join by water pump and pH regulator pond 3 water outlets, electrocoagulation groove 5 water outlets and settling tank 8 entrances join, the water outlet of settling tank 8 joins by the water-in of water pump and polysulfone hollow fiber ultrafiltration membrane system 9, the water outlet of polysulfone hollow fiber ultrafiltration membrane system 9 connects clean water basin.
In the present invention, described battery lead plate 6 is arranged in parallel in electrocoagulation groove 5, and battery lead plate 6 both sides are fixed in electrocoagulation groove 5 by draw-in groove 11, and the spacing of adjacent battery lead plate 6 is 5-40mm.
In the present invention, water-in and the water outlet of described electrocoagulation groove 5 are equipped with valve.
The technique that a kind of combination unit of processing micro-polluted water that the present invention proposes adopts, concrete steps are as follows:
(1) water that is stored in former pond is imported in pH regulator pond, carry out pH regulator;
(2) water after pH regulator is squeezed in electrocoagulation groove by water pump, when opening whipping appts, opened automatic commutator pulse power supply, make current density be stabilized in a value; According to the difference of micro-polluted water matter and processing requirements, controlling current density is 1-10mA/cm2, and electrolysis time is 5-60min;
(3) will import settling tank through the pretreated water of electrocoagulation, during quiet heavy 10-30min, chien shih electrolysis flco out obtains sedimentation;
(4) regulate transmembrane pressure and the Water discharge flow speed of polysulfone hollow fiber ultrafiltration membrane system, will by pump, import in polysulfone hollow fiber ultrafiltration membrane system through the supernatant liquor of step (3);
(5) water outlet of polysulfone hollow fiber ultrafiltration membrane system is imported in clean water basin.
In the present invention, the mode that described some battery lead plates 6 adopt single-stage to be connected with described automatic commutator pulse power supply 7, in treating processes, by the polarity of the continuous transfer electron plate of automatic commutator pulse power supply.
In the present invention, the rotating speed of described whipping appts 4 is 80-500r/min.
In the present invention, polysulfone hollow fiber ultrafiltration membrane system 9 is inner pressed PVC alloy, and trapped molecular weight is 5-50kDa, and water production rate is 0.5-6.4m3/h.
The present invention compares with traditional water technology, has the following advantages:
The oxyhydroxide that electrocoagulation air supporting produces has than the stronger activity of traditional chemical flocculation, and the organism in micro-polluted water and inorganics are had to powerful throwing out.
Coagulation cumulative produces uniform and stable micro-bubble, can air supporting remove minimum colloidal solid, and the hydrogen that negative electrode produces has than the strong twice floating power of carrying of pressure floatation air, has significantly strengthened the removal of oily substance, SS, COD in micro-polluted water.
Without adding chemical agent, saved corresponding material and cost of equipment, and can not produce secondary pollution.
Electrocoagulation applied widely, is not subject to water quality impact, can, according to the best electrolytic current density of different water quality regulation, make water outlet reach requirement.
In water, organism easily causes the pollution of ultra-filtration membrane, causes process costs to increase, and with electrocoagulation, carries out pre-treatment, has significantly slowed down the pollution of film, has extended the cleaning interval of film.
Itself does not have moving parts hyperfiltration membrane assembly, and power consumption is lower, to working temperature without particular requirement.
Processing profit ability and the scale of ultra-filtration membrane sepn process can be according to practical situation adjustment, and testing installation can direct proportional amplification be applied to Practical Project.
Plant area area is little, and running is simple, easy to operate, easily realizes automatization, easy care.
Accompanying drawing explanation
fig. 1 iselectrocoagulation, ultrafiltration and electrocoagulation-ultrafiltration combination process be the removal effect figure to pollutent respectively;
Fig. 2 is setting drawing of the present invention;
Fig. 3 is the schematic diagram of electrocoagulation groove.
number in the figure:1 is former pond, and 2 is water pump, and 3 is pH regulator pond, and 4 is whipping appts, and 5 is electrocoagulation groove, and 6 is battery lead plate, and 7 is automatic commutator pulse power supply, and 8 is settling tank, and 9 is polysulfone hollow fiber ultrafiltration membrane system, and 10 is clean water basin, and 11 is draw-in groove.
Embodiment
The present invention is further illustrated in connection with accompanying drawing for following examples.
Embodiment 1:
Referring to Fig. 2, the device of processing micro-polluted water of the present invention, comprises former pond 1, water pump 2, pH regulator pond 3, whipping appts 4, electrocoagulation groove 5, battery lead plate 6, automatic commutator pulse power supply 7, settling tank 8, polysulfone hollow fiber ultrafiltration membrane system 9, clean water basin 10.In draw-in groove 11 in described electrocoagulation groove 5, be provided with some electrode plate 6, automatically commutator pulse power supply 7 output ports are joined by wire and the battery lead plate 6 that is arranged in electrocoagulation groove 5, pH regulator pond 3 water inlets join by water pump and former pond 1 water outlet, electrocoagulation groove 5 water inlets join by water pump and pH regulator pond 3 water outlets, electrocoagulation groove 5 water outlets and settling tank 8 entrances join, the water outlet of settling tank 8 joins by the water-in of water pump and polysulfone hollow fiber ultrafiltration membrane system 9, and the water outlet of polysulfone hollow fiber ultrafiltration membrane system 9 connects clean water basin.
Micro-polluted water, after electrocoagulation-ultrafiltration combination process, reaches the requirement of tap water: electrocoagulation processing → uf processing.Concrete implementation step is as follows:
(1) water that is stored in former pond 1 is imported in pH regulator pond 3, carry out pH regulator;
(2) water in pH regulator pond 3 is imported in electrocoagulation groove 5 by pump, when opening whipping appts 4, open automatic commutator pulse power supply 7, make the current density in electrocoagulation groove be stabilized in a value;
(3) will import settling tank 8 through the pretreated water of electrocoagulation, and after quiet sinking, make flco obtain sedimentation;
(4) regulate transmembrane pressure and the Water discharge flow speed of polysulfone hollow fiber ultrafiltration membrane system 9, will by water pump, import in polysulfone hollow fiber ultrafiltration membrane system 9 through the supernatant liquor of step (3);
(5) water outlet of polysulfone hollow fiber ultrafiltration membrane system 9 is imported in clean water basin 10.
The processing that is used for simulating micro-polluted water with said apparatus.
In electrocoagulation groove 5, be arranged in parallel 6 blocks of pure aluminum plates as battery lead plate 6, polar plate spacing 20mm, the sudden change recurrence interval of the pulse power is 15s, change different current density (1.14mA/cm2, 2.28mA/cm2, 3.42mA/cm2, 4.56mA/cm2), electrolysis time 40min, polysulfone hollow fiber ultrafiltration membrane system 9 is inner pressed PVC alloy, trapped molecular weight is 50kDa, in water inlet, pH is 7.2, turbidity is 20NTU, TOC concentration is 100mg/L, ammonia nitrogen concentration is 1mg/L, total phosphorus concentration is under the condition of 1mg/L, the water outlet of electrocoagulation groove 5 is in settling tank 8 after standing 20min, again after polysulfone hollow fiber ultrafiltration membrane system 9 filters, measure the turbidity of water outlet, TOC, the concentration of ammonia nitrogen and total phosphorus, result is as shown in table 1.
The impact of the different current density of table 1 on each pollutant removal
| Current density | 1.14mA/cm2 | 2.28mA/cm2 | 3.42mA/cm2 | 4.56mA/cm2 |
| Turbidity removal rate | 98% | 99% | 99% | 99% |
| TOC clearance | 58.5% | 68.4% | 75.3% | 78.5% |
| Ammonia nitrogen removal frank | 34.9% | 41.3% | 51.4% | 57.0% |
| Total tp removal rate | 99% | 99% | 99% | 99% |
Embodiment 2
Described in employing embodiment 1, device is for the processing to Tongji University's three good room rivers.
The index of described pending micro-polluted water is as shown in table 2.
Table 2
In electrocoagulation groove 5, be arranged in parallel 6 blocks of pure aluminum plates as battery lead plate 6, polar plate spacing 10mm, the sudden change recurrence interval of the pulse power is 15s, constant current density is at 3.42mA/cm2, electrolysis time 40min, polysulfone hollow fiber ultrafiltration membrane system 9 is inner pressed PVC alloy, trapped molecular weight is under the condition of 50kDa, the water outlet of electrocoagulation groove 5 is in settling tank 8 after standing 20min, through polysulfone hollow fiber ultrafiltration membrane system 9, filter again, the concentration of the turbidity of water outlet, TOC, ammonia nitrogen is respectively 0.1NTU, 15.1mg/L, 0.42mg/L, and total phosphorus is almost all removed.
Embodiment 3
Described in employing embodiment 1, device is for the processing to Suzhou river.
The index of described pending micro-polluted water is as shown in table 3.
Table 3
In electrocoagulation groove 5, be arranged in parallel 6 blocks of pure aluminum plates as battery lead plate 6, polar plate spacing 10mm, the sudden change recurrence interval of the pulse power is 15s, constant current density is at 3.42mA/cm2, electrolysis time 30min, polysulfone hollow fiber ultrafiltration membrane system 9 is inner pressed PVC alloy, trapped molecular weight is under the condition of 50kDa, the water outlet of electrocoagulation groove 5 is in settling tank 8 after standing 20min, through polysulfone hollow fiber ultrafiltration membrane system 9, filter again, the concentration of the turbidity of water outlet, TOC, ammonia nitrogen can reach 0.2NTU, 11.8mg/L, 0.47mg/L respectively, and total phosphorus is almost all removed.In addition, also tested electrocoagulation and the treatment effect of ultra-filtration technique to Suzhou river single under the same terms, contrasted with combination process, result as shown in Figure 1, shows that combination process all increases with respect to monotechnics to the removal effect of each pollutent.
Claims (7)
1. a combination unit of processing micro-polluted water, this device comprises former pond (1), pH regulator pond (3), whipping appts (4), electrocoagulation groove (5), automatic commutator pulse power supply (7), settling tank (8), polysulfone hollow fiber ultrafiltration membrane system (9) and clean water basin (10), it is characterized in that: in described electrocoagulation groove (5), be provided with some electrode plate (6), automatically commutator pulse power supply (7) output port is joined by wire and the battery lead plate (6) that is arranged in electrocoagulation groove (5), pH regulator pond (3) water inlet joins by water pump and former pond (1) water outlet, electrocoagulation groove (5) water inlet joins by water pump and pH regulator pond (3) water outlet, electrocoagulation groove (5) water outlet and settling tank (8) entrance join, the water outlet of settling tank (8) joins by the water-in of water pump and polysulfone hollow fiber ultrafiltration membrane system (9), the water outlet of polysulfone hollow fiber ultrafiltration membrane system (9) connects clean water basin.
2. a kind of combination unit of processing micro-polluted water according to claim 1, it is characterized in that: described battery lead plate (6) is arranged in parallel in electrocoagulation groove (5), battery lead plate (6) both sides are fixed in electrocoagulation groove (5) by draw-in groove (11), and the spacing of adjacent battery lead plate (6) is 5-40mm.
3. a kind of combination unit of processing micro-polluted water according to claim 1, is characterized in that: water-in and the water outlet of described electrocoagulation groove (5) are equipped with valve.
4. a technique of processing the combination unit employing of micro-polluted water, is characterized in that, concrete steps are as follows:
(1) water that is stored in former pond is imported in pH regulator pond, carry out pH regulator;
(2) water after pH regulator is squeezed in electrocoagulation groove by water pump, when opening whipping appts, opened automatic commutator pulse power supply, make current density be stabilized in a value; According to the difference of micro-polluted water matter and processing requirements, controlling current density is 1-10mA/cm2, and electrolysis time is 5-60min;
(3) will import settling tank through the pretreated water of electrocoagulation, during quiet heavy 10-30min, chien shih electrolysis flco out obtains sedimentation;
(4) regulate transmembrane pressure and the Water discharge flow speed of polysulfone hollow fiber ultrafiltration membrane system, will by water pump, import in polysulfone hollow fiber ultrafiltration membrane system through the supernatant liquor of step (3);
(5) water outlet of polysulfone hollow fiber ultrafiltration membrane system is imported in clean water basin.
5. the technique that a kind of combination unit of processing micro-polluted water according to claim 4 adopts, it is characterized in that: the mode that described some battery lead plates (6) adopt single-stage to be connected with described automatic commutator pulse power supply (7), in treating processes, by the polarity of the continuous transfer electron plate of automatic commutator pulse power supply.
6. the technique that a kind of combination unit of processing micro-polluted water according to claim 1 adopts, is characterized in that: the rotating speed of described whipping appts (4) is 80-500r/min.
7. the technique that a kind of combination unit of processing micro-polluted water according to claim 1 adopts, is characterized in that: polysulfone hollow fiber ultrafiltration membrane system (9) is inner pressed PVC alloy, and trapped molecular weight is 5-50kDa, and water production rate is 0.5-6.4m3/h.
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| CN201410342465.5A CN104098209A (en) | 2014-07-18 | 2014-07-18 | Combined process and device for treating slightly polluted water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113023964A (en) * | 2021-03-01 | 2021-06-25 | 哈尔滨工业大学 | Pulse electric flocculation device for removing color and turbidity of source water and use method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792199A (en) * | 2010-02-26 | 2010-08-04 | 厦门市威士邦膜科技有限公司 | Sewage treatment technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792199A (en) * | 2010-02-26 | 2010-08-04 | 厦门市威士邦膜科技有限公司 | Sewage treatment technique |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113023964A (en) * | 2021-03-01 | 2021-06-25 | 哈尔滨工业大学 | Pulse electric flocculation device for removing color and turbidity of source water and use method thereof |
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Application publication date: 20141015 |