CN103964619A - Advanced treatment and reuse method of pre-coated membrane of tail water of sewage plant - Google Patents
Advanced treatment and reuse method of pre-coated membrane of tail water of sewage plant Download PDFInfo
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- CN103964619A CN103964619A CN201410220714.3A CN201410220714A CN103964619A CN 103964619 A CN103964619 A CN 103964619A CN 201410220714 A CN201410220714 A CN 201410220714A CN 103964619 A CN103964619 A CN 103964619A
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Abstract
The invention discloses an advanced treatment and reuse method of a pre-coated membrane of tail water of a sewage plant. The method comprises the following steps: firstly, feeding tail water into an adjusting pool so as to be homogenized, and then passing through a sand filter; passing through an ultrafiltration membrane by a solution containing a pre-coated membrane material and sand filtered effluent and effectively forming a dynamic membrane on the surface of the ultrafiltration membrane, wherein concentrated water of the ultrafiltration membrane returns to the adjusting pool while the effluent enters into a middle water tank; backwashing the ultrafiltration membrane through a pump by part of water in the middle water tank periodically, wherein the pre-coated membrane automatically falls and the sediment of the coating material is recycled to a pre-coated membrane material dosing device repeatedly, so that the operating cost is lowered; entering into reverse osmosis membrane treatment by water in the middle water tank, fresh reverse osmosis membrane is used as industrial water in the park to be returned, and the concentrated water is treated by an electrochemical reactor, and the effluent reaches the standard to be discharged. By adopting the pre-coated membrane method, the ultrafiltration backwashing frequency is low, and the water yield of the ultrafiltration membrane is improved. Loose filter cake layers with great holes can be formed to effectively relieve the rate of descent of membrane flux, improve the anti-pollution capacity of the membrane and improve the removal effect of the membrane on the water quality index at the same time.
Description
Technical field
The invention belongs to advanced treatment of wastewater and reuse project field, relate to the method for the Sewage Plant Tailwater Depth processing of a kind of industry park and reuse.
Background technology
The water scarcity of growing tension and water environment pollution problem, caused domestic and international great attention.Industrial sewage regeneration is to alleviate water scarcity situation, the effective way of alleviate water pollution degree, improving the ecological environment, how rationally effectively sewage resource in garden to be fully utilized, become the key that solves garden water resources utilization and water environment pollution problem.Sewage Plant tail water main water-quality guideline in industrial park can not meet reuse standard as organism, ammonia nitrogen, salt grade, and needs further advanced treatment.And membrane separation technique is worldwide paid much attention to, its great advantage is exactly that separation efficiency is high, product water can be back to production process.But polluting, film becomes the further bottleneck problem of application of restriction membrane separation technique.
Two embrane methods refer to a kind of water treatment method that ultra-filtration membrane (UF) and reverse osmosis membrane (RO) combine, although two embrane methods have more advantage, but in actual motion, still there are these problems, be mainly manifested in how controlling diaphragm pollutes, thereby raising membrane flux, to obtain longer membrane lifetime.Ultra-filtration membrane can reduce the pollution of follow-up reverse osmosis membrane, but ultra-filtration membrane is through the operation of certain hour, the film surface materials such as partial organic substances, virus, bacterium, algae that all can dam, and ultra-filtration membrane also can inevitably be polluted.Be in operation and need to carry out regular backwash to ultrafiltration, the part trapped substance that can take away film surface, delays the decay of membrane flux, and backwash frequency is generally every 20 minutes by 60 minutes once, each backwash time is 20 seconds to 80 seconds, and high-frequency backwash meeting obviously reduces the producing water ratio of ultra-filtration membrane.In addition, the dense glassware for drinking water of film has saltiness higher, and the feature that biodegradability is poor is processed difficulty relatively.Therefore, how efficient recovery membrane backwashing and the dense water of film are also the problems that membrane technique must solve in advanced treatment of wastewater application.
Summary of the invention
Goal of the invention: for the problems referred to above that exist in the two film advanced treatment of Sewage Plant tail water in industry park in prior art and reuse method, the invention provides a kind of method of Sewage Plant tail water pre-coating film advanced treatment and reuse.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A method for Sewage Plant tail water pre-coating film advanced treatment and reuse, it comprises the following steps:
(1) first tail water is sent into equalizing tank homogeneous;
(2) pass through again sand-bed filter, remove the suspended impurity of larger particles in waste water;
(3) pre-coating film material adds in sand-bed filter water outlet by class coating material chemicals dosing plant, passes through ultra-filtration membrane containing the sand-bed filter water outlet of pre-coating film material solution, forms dynamic precoated layer on ultra-filtration membrane surface, and ultra-filtration membrane concentrate recirculation is to equalizing tank, and water outlet enters intermediate pool;
(4) water of intermediate pool enters into reverse osmosis membrane processing, the reuse of reverse osmosis membrane fresh water, and dense water enters into dense pond;
(5) dense tank water is passed through electrochemical reactor processing again, water outlet qualified discharge.
As a further improvement on the present invention, between step (3) and (4), also comprise backwash step,, the part water of intermediate pool regularly carries out back flushing by pump to ultra-filtration membrane, make precoated layer Automatic-falling, taken out of by backwash water, enter into class coating material settling tank, class coating material precipitation in class coating material settling tank is back to use class coating material chemicals dosing plant and recycles, and class coating material settling tank supernatant liquor enters into dense pond.
As a further improvement on the present invention, described ultra-filtration membrane is hollow-fibre membrane, and accurate filter is set before membrane module, filtering accuracy 5 ~ 40 μ m.
As a further improvement on the present invention, described ultra-filtration membrane concentrate recirculation, reflux ratio is 3% ~ 8%.
As a further improvement on the present invention, in described class coating material chemicals dosing plant, pre-coating film material is zeolite powder and/or diatomite and/or gac, and particle diameter is 400 ~ 2000 orders, and chemical feeding quantity is 50 ~ 400 mg/L.
As a further improvement on the present invention, described ultra-filtration membrane backwash, backwash frequency be every 1 hour to 3 hours once, each backwash time is 20 seconds to 80 seconds, backwash flow is 1.5 times to 3.0 times of ultrafiltration flooding velocity.
As a further improvement on the present invention, described class coating material settling tank is divided into reaction zone and settling region, adds polyacrylamide flocculant in reaction zone, and chemical feeding quantity is 0.5 ~ 3 mg/L.
As a further improvement on the present invention, described electrochemical reactor is two-dimensional electrode or three-diemsnional electrode catalytic reaction device, and adjusting current density is 5 ~ 50mA/cm
2, 30 ~ 90 minutes electrolysis residence time.
Beneficial effect of the present invention:
Adopt the method for pre-coating film of the present invention, can form effectively " protective layer " on ultra-filtration membrane surface, to hold back the pollutent that is deposited on film surface, pollution abatement thing and the direct of film contact.By class coating material settling tank, pre-coating film hyperfiltration reverse-rinsing water is carried out to solid-liquid separation, class coating material loops back and closes in pre-coating film material chemicals dosing plant, and is again used in pre-coating film ultrafiltration system, can efficient recovery class coating material, realize the recycling of backwash water, reduce running cost.
This precoating embrane method hyperfiltration reverse-rinsing frequency is low, can improve the producing water ratio of ultra-filtration membrane; And can form the cake layer loose, hole is larger, relatively loose, adsorbable partial organic substances and inorganic salt, and be easily backwashed, the lowering speed of ultra-filtration membrane flux effectively alleviated, delay the pollution of film, the contamination resistance of reinforced film, membrane flux fall off rate slows down more than 30%, improves the removal effect of ultra-filtration membrane to water-quality guideline simultaneously, the clearance of COD, TN and UV254 improves more than 25%, and follow-up reverse osmosis membrane flux fall off rate slows down more than 15%.The dense water saltiness of membrane backwashing and film is higher, good conductivity, and electrochemical oxidation can be realized higher current density under lower voltage, contributes to the raising of oxidation efficiency, can effectively process membrane backwashing and the dense water of film.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention;
Fig. 2 is the SEM figure of fresh ultra-filtration membrane;
Fig. 3 is the SEM figure of precoating ultra-filtration membrane.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The flow process of the method for a kind of industry park of the present invention Sewage Plant tail water pre-coating film advanced treatment and reuse as shown in Figure 1, the steps include:
First the tail water after secondary biochemical treatment is sent into equalizing tank homogeneous, then pass through quartz filter, remove the suspended impurity of larger particles in waste water; Pre-coating film material adds by chemicals dosing plant, together passes through ultra-filtration membrane containing pre-coating film material solution and sand filtration water outlet, effectively forms Dynamic Membrane on ultra-filtration membrane surface, and ultra-filtration membrane concentrate recirculation is to equalizing tank, and water outlet enters intermediate pool; The part water of intermediate pool regularly carries out back flushing by pump to ultra-filtration membrane, make pre-coating film Automatic-falling, taken out of by backwash water, enter into class coating material settling tank, class coating material precipitation is back to use pre-coating film material chemicals dosing plant and recycles, and settling tank supernatant liquor enters into dense pond; The water of intermediate pool enters into reverse osmosis membrane processing, and reverse osmosis membrane fresh water is as garden process water reuse, and dense water enters into dense pond; Dense tank water is passed through electrochemical reactor processing again, water outlet qualified discharge.
Wherein, ultra-filtration membrane is hollow-fibre membrane, and accurate filter is set before membrane module, filtering accuracy 5 ~ 40 μ m.The structure of fresh ultra-filtration membrane and precoating ultra-filtration membrane respectively as shown in Figures 2 and 3.
Wherein, ultra-filtration membrane concentrate recirculation, reflux ratio is 3% ~ 8%.
Wherein, in chemicals dosing plant, pre-coating film material is zeolite powder, diatomite or gac, and particle diameter is 400 ~ 2000 orders, and chemical feeding quantity is 50 ~ 400 mg/L.
Wherein, ultra-filtration membrane backwash, backwash frequency be every 1 hour to 3 hours once, each backwash time is 20 seconds to 80 seconds, backwash flow is 1.5 times to 3.0 times of ultrafiltration flooding velocity.
Wherein, class coating material settling tank is divided into reaction zone and settling region, adds polyacrylamide flocculant in reaction zone, and chemical feeding quantity is 0.5 ~ 3 mg/L.
Wherein, electrochemical reactor is two-dimensional electrode or three-diemsnional electrode catalytic reaction device, and adjusting current density is 5 ~ 50mA/cm
2, 30 ~ 90 minutes electrolysis residence time.
Be described further as embodiment using three kinds of situations of method Dui Mou of the present invention industry park sewage treatment plant tail water processing below.
Case study on implementation 1:
Certain industry park sewage treatment plant tail water, water quality characteristic is as follows: COD 55 mg/L, TN 17.3 mg/L, UV
2540.232 cm
-1, turbidity 2.6, specific conductivity 5610 μ s/cm.Tail water pre-coating film advanced treatment and reuse concrete technology flow process as shown in Figure 1, are first sent the tail water after secondary biochemical treatment into equalizing tank homogeneous, then are passed through quartz filter, remove the suspended impurity of larger particles in waste water; Zeolite powder adds by chemicals dosing plant as pre-coating film material, particle diameter is 2000 orders, chemical feeding quantity is 200 mg/L, together pass through ultra-filtration membrane containing pre-coating film material solution and sand filtration water outlet, ultra-filtration membrane is hollow-fibre membrane, and the accurate filter that filtering accuracy is 10 μ m is set before membrane module, and ultra-filtration membrane concentrate recirculation is to equalizing tank, reflux ratio is 5%, and water outlet enters intermediate pool; The part water of intermediate pool regularly carries out back flushing by pump to ultra-filtration membrane, backwash frequency be every 2 hours once, each backwash time is 50 seconds, backwash flow is 2 times of ultrafiltration flooding velocity, backwash water enters into class coating material settling tank, adds polyacrylamide flocculant in reaction zone, and chemical feeding quantity is 2mg/L, recycle by being back to use pre-coating film material chemicals dosing plant after settling region class coating material precipitation, settling tank supernatant liquor enters into dense pond; The water of intermediate pool enters into reverse osmosis membrane processing, and reverse osmosis membrane fresh water is as garden process water reuse, and dense water enters into dense pond; Dense tank water is passed through the processing of two-dimensional electrode electrochemical reactor again, and adjusting current density is 20mA/cm
2, 45 minutes electrolysis residence time, water outlet qualified discharge (GB 18918-2002 one-level B standard).With do not add under the same process parameter of pre-coating film material, this pre-coating film advanced treatment and reuse method, make ultra-filtration membrane flux fall off rate slow down 45%, improves the removal effect of ultra-filtration membrane to water-quality guideline, COD, TN and UV simultaneously
254clearance improve respectively 33%, 30% and 31%, follow-up reverse osmosis membrane flux fall off rate slows down 20%.Principal pollutant removal efficiency is in table 1.
Table 1 technique unit removal efficiency table
Case study on implementation 2:
Certain industry park sewage treatment plant tail water, water quality characteristic is as follows: COD 42 mg/L, TN 13.6 mg/L, UV
2540.207 cm
-1, turbidity 1.5, specific conductivity 3950 μ s/cm.Tail water pre-coating film advanced treatment and reuse concrete technology flow process as shown in Figure 1, are first sent the tail water after secondary biochemical treatment into equalizing tank homogeneous, then are passed through quartz filter, remove the suspended impurity of larger particles in waste water; Gac adds by chemicals dosing plant as pre-coating film material, particle diameter is 500 orders, chemical feeding quantity is 100mg/L, together pass through ultra-filtration membrane containing pre-coating film material solution and sand filtration water outlet, ultra-filtration membrane is hollow-fibre membrane, and the accurate filter that filtering accuracy is 30 μ m is set before membrane module, and ultra-filtration membrane concentrate recirculation is to equalizing tank, reflux ratio is 3%, and water outlet enters intermediate pool; The part water of intermediate pool regularly carries out back flushing by pump to ultra-filtration membrane, backwash frequency be every 3 hours once, each backwash time is 30 seconds, backwash flow is 1.5 times of ultrafiltration flooding velocity, backwash water enters into class coating material settling tank, adds polyacrylamide flocculant in reaction zone, and chemical feeding quantity is 1mg/L, recycle by being back to use pre-coating film material chemicals dosing plant after settling region class coating material precipitation, settling tank supernatant liquor enters into dense pond; The water of intermediate pool enters into reverse osmosis membrane processing, and reverse osmosis membrane fresh water is as garden process water reuse, and dense water enters into dense pond; Dense tank water is passed through the processing of two-dimensional electrode electrochemical reactor again, and adjusting current density is 10mA/cm
2, 30 minutes electrolysis residence time, water outlet qualified discharge (GB 18918-2002 one-level A standard).With do not add under the same process parameter of pre-coating film material, this pre-coating film advanced treatment and reuse method, make ultra-filtration membrane flux fall off rate slow down 30%, improves the removal effect of ultra-filtration membrane to water-quality guideline, COD, TN and UV simultaneously
254clearance improve respectively 29%, 25% and 27%, follow-up reverse osmosis membrane flux fall off rate slows down 15%.Principal pollutant removal efficiency is in table 2.
Table 2 technique unit removal efficiency table
Case study on implementation 3:
Certain industry park sewage treatment plant tail water, water quality characteristic is as follows: COD 60 mg/L, TN 19.5 mg/L, UV
2540.271 cm
-1, turbidity 3.1, specific conductivity 6630 μ s/cm.Tail water pre-coating film advanced treatment and reuse concrete technology flow process as shown in Figure 1, are first sent the tail water after secondary biochemical treatment into equalizing tank homogeneous, then are passed through quartz filter, remove the suspended impurity of larger particles in waste water; Diatomite adds by chemicals dosing plant as pre-coating film material, particle diameter is 1000 orders, chemical feeding quantity is 400 mg/L, together pass through ultra-filtration membrane containing pre-coating film material solution and sand filtration water outlet, ultra-filtration membrane is hollow-fibre membrane, and the accurate filter that filtering accuracy is 20 μ m is set before membrane module, and ultra-filtration membrane concentrate recirculation is to equalizing tank, reflux ratio is 8%, and water outlet enters intermediate pool; The part water of intermediate pool regularly carries out back flushing by pump to ultra-filtration membrane, backwash frequency be every 1.5 hours once, each backwash time is 80 seconds, backwash flow is 3 times of ultrafiltration flooding velocity, backwash water enters into class coating material settling tank, adds polyacrylamide flocculant in reaction zone, and chemical feeding quantity is 3mg/L, recycle by being back to use pre-coating film material chemicals dosing plant after settling region class coating material precipitation, settling tank supernatant liquor enters into dense pond; The water of intermediate pool enters into reverse osmosis membrane processing, and reverse osmosis membrane fresh water is as garden process water reuse, and dense water enters into dense pond; Dense tank water is passed through the processing of two-dimensional electrode electrochemical reactor again, and adjusting current density is 40mA/cm
2, 60 minutes electrolysis residence time, water outlet qualified discharge (GB 18918-2002 one-level B standard).With do not add under the same process parameter of pre-coating film material, this pre-coating film advanced treatment and reuse method, make ultra-filtration membrane flux fall off rate slow down 35%, improves the removal effect of ultra-filtration membrane to water-quality guideline, COD, TN and UV simultaneously
254clearance improve respectively 27%, 25% and 26%, follow-up reverse osmosis membrane flux fall off rate slows down 15%.Principal pollutant removal efficiency is in table 3.
Table 3 technique unit removal efficiency table
As fully visible, this precoating embrane method hyperfiltration reverse-rinsing frequency is low, can improve the producing water ratio of ultra-filtration membrane; And can form the cake layer loose, hole is larger, and effectively alleviate the lowering speed of membrane flux, the contamination resistance of reinforced film improves the removal effect of film to water-quality guideline simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a method for Sewage Plant tail water pre-coating film advanced treatment and reuse, it comprises the following steps:
(1) first tail water is sent into equalizing tank homogeneous;
(2) pass through again sand-bed filter, remove the suspended impurity of larger particles in waste water;
(3) pre-coating film material adds in sand-bed filter water outlet by class coating material chemicals dosing plant, passes through ultra-filtration membrane containing the sand-bed filter water outlet of pre-coating film material solution, forms dynamic precoated layer on ultra-filtration membrane surface, and ultra-filtration membrane concentrate recirculation is to equalizing tank, and water outlet enters intermediate pool;
(4) water of intermediate pool enters into reverse osmosis membrane processing, the reuse of reverse osmosis membrane fresh water, and dense water enters into dense pond;
(5) dense tank water is passed through electrochemical reactor processing again, water outlet qualified discharge.
2. the method for a kind of Sewage Plant tail water pre-coating film advanced treatment according to claim 1 and reuse, it is characterized in that: between step (3) and (4), also comprise backwash step,, the part water of intermediate pool regularly carries out back flushing by pump to ultra-filtration membrane, make precoated layer Automatic-falling, taken out of by backwash water, enter into class coating material settling tank, class coating material precipitation in class coating material settling tank is back to use class coating material chemicals dosing plant and recycles, and class coating material settling tank supernatant liquor enters into dense pond.
3. according to a kind of Sewage Plant tail water pre-coating film advanced treatment described in claim 1 or 2 and the method for reuse, it is characterized in that: described ultra-filtration membrane is hollow-fibre membrane, accurate filter is set before membrane module, filtering accuracy 5 ~ 40 μ m.
4. the method for a kind of Sewage Plant tail water pre-coating film advanced treatment according to claim 1 and 2 and reuse, is characterized in that: described ultra-filtration membrane concentrate recirculation, reflux ratio is 3% ~ 8%.
5. the method for a kind of Sewage Plant tail water pre-coating film advanced treatment according to claim 1 and 2 and reuse, it is characterized in that: in described class coating material chemicals dosing plant, pre-coating film material is zeolite powder and/or diatomite and/or gac, particle diameter is 400 ~ 2000 orders, and chemical feeding quantity is 50 ~ 400 mg/L.
6. the method for a kind of Sewage Plant tail water pre-coating film advanced treatment according to claim 2 and reuse, it is characterized in that: described ultra-filtration membrane backwash, backwash frequency be every 1 hour by 3 hours once, each backwash time is 20 seconds to 80 seconds, and backwash flow is 1.5 times to 3.0 times of ultrafiltration flooding velocity.
7. the method for a kind of Sewage Plant tail water pre-coating film advanced treatment according to claim 2 and reuse, it is characterized in that: described class coating material settling tank is divided into reaction zone and settling region, in reaction zone, add polyacrylamide flocculant, chemical feeding quantity is 0.5 ~ 3 mg/L.
8. the method for a kind of Sewage Plant tail water pre-coating film advanced treatment according to claim 1 and 2 and reuse, is characterized in that: described electrochemical reactor is two-dimensional electrode or three-diemsnional electrode catalytic reaction device, and adjusting current density is 5 ~ 50mA/cm
2, 30 ~ 90 minutes electrolysis residence time.
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| CN109761386A (en) * | 2019-03-15 | 2019-05-17 | 吉林海普科技发展有限公司 | Water paint cleans solvent slop processing unit |
| CN109761386B (en) * | 2019-03-15 | 2024-03-08 | 吉林海普科技发展有限公司 | Water paint washs useless solvent processing apparatus |
| CN112321074A (en) * | 2020-10-26 | 2021-02-05 | 中海油节能环保服务有限公司 | Coal chemical wastewater treatment process |
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