CN102531278A - Process and system for deeply treating drinking water through two-section membrane method - Google Patents
Process and system for deeply treating drinking water through two-section membrane method Download PDFInfo
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- CN102531278A CN102531278A CN2011103809921A CN201110380992A CN102531278A CN 102531278 A CN102531278 A CN 102531278A CN 2011103809921 A CN2011103809921 A CN 2011103809921A CN 201110380992 A CN201110380992 A CN 201110380992A CN 102531278 A CN102531278 A CN 102531278A
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Abstract
The invention relates to a process and a system for deeply treating drinking water through a two-section membrane method. The process includes: firstly, leading particles and partial organic matter molecules in raw water to form alumen ustum sediment through the strengthening coagulation effect; secondly, removing ammonia nitrogen, nitrate nitrogen and biochemical organic carbon in water through the biochemical chemical effect of a biomembrane; thirdly, removing suspended particles and macromolecules in water through filteration; and fourthly, removing trace organic matter and microorganisms in water through the nanofiltration interception effect. The system includes a strengthening coagulation membrane bioreactor (MBR) pretreatment working section and a nanofiltration (NF) purification working section, wherein the working sections are connected through a water passage. The process for deeply treating drinking water through the two-section membrane method can effectively remove water furbidity, the organic matter and trace contaminants. The system for deeply treating drinking water through the two-section membrane method is short in flow, small in occupied area, excellent in outlet water quality and stable in operation, can be used for upgrading transformation of normal water purification processes, and has high practicality.
Description
Technical field
The present invention relates to water technology, be specifically related to a kind of two-part embrane method drinking water deep treatment process.The invention still further relates to the system that adopts said technology.
Background technology
Water pollutes the drinking water safety property problem serious threat that causes and the healthy of people.Micropollutant in the water has strong toxicity, low, the difficult characteristics of removing of content, and conventional drinking water treatment technology is difficult to effectively remove this type material.Toxic pollutant main in China's water body comprises: volatility halohydrocarbon, benzene series thing, chlorinated benzene class, nitrobenzene, phenyl amines, phenols, polycyclic aromatic hydrocarbons, agricultural chemicals and heavy metal and compound thereof etc.The total characteristics of these pollutents are that content is low, in water body, exist with trace or trace; Toxicity is big, and the pollution of denier just can influence HUMAN HEALTH; Difficult degradation is difficult to degraded under field conditions (factors), can be present in the water body for a long time and enrichment in bed mud, organism, human body.Technology such as the flocculation of conventional drinking water treatment technology, deposition, filtration are difficult to effectively remove these micropollutants.
Therefore, many conventional drink water purifyings factory needs technology upgrading, drops into advanced treatment process.Present domestic most widely used advanced treatment process is the ozone and activated carbon technology, but should technology have problems such as generating DBPs, biological leakage and microfauna.
Advantages such as nanofiltration is good, stable because of its effluent quality, and technical process is short obtain extensive studies and development in recent years, and begin to use in China.The 200 daltonian filtering accuracies that the nf membrane technology is had can effectively be removed the larger molecular organics in the water.For pollutents such as small organic molecule and ion, heavy metals, the unique charged repulsive interaction of nf membrane can guarantee that these pollutents are effectively held back, thereby produces high-quality healthy drinking water.
But owing in application process, there is problem such as film pollution, nanofiltration technique has strict requirement to pre-treatment.Main pretreatment mode has coagulation-deposition-sand filtration technology, activated carbon filtration technology, micro-filtration-ultrafiltration technology etc. at present.Wherein coagulation-deposition-sand filtration is a traditional filtering technology, but this technical process is long, floor space is big; Micro-filtration-ultrafiltration is a novel process, and this technological operation is simple, floor space is little but running cost is higher; The MBR technology of the combined reinforced coagulation of Powdered Activated Carbon has combined the advantage of traditional technology and membrane process, and floor space is little, and integrated level is high, but water purification performance has much room for improvement.If with of the pre-treatment of these conventional treatment processes as nanofiltration technique; It is short to bring into play the membrane process flow process effectively; The advantage that floor space is little, and the pre-treatment effluent quality is difficult to guarantee, can cause problems such as the decline of advanced treatment process effluent quality, nf membrane pollution.
The combined reinforced coagulation MBR of Powdered Activated Carbon technology can be integrated in common process, charcoal absorption, membrane filtration processes in the working cell.To the organism characteristic and the regularity of distribution in the former water; And exist micropollutant; Integral type MBR has multi-functional; Not only can pass through coagulation-flocculation process and realize removal, can also add powdered activated charcoal strengthened processing micropollutant and part toxic substance suspended particulate and colloidalmaterial; Simultaneously, accomplish the biological pre-oxidation process through the mikrobe among the MBR, effectively remove the ammonia nitrogen that exists in the former water with can biochemical organism; Moreover, because integral type system, coupled medicament adding equipment, can be according to former water characteristic real-time regulating system operational conditions, reach the purpose that guarantees that effluent quality is good, energy-saving and cost-reducing and practice thrift construction land.
Summary of the invention
First technical problem to be solved by this invention just provides a kind of two-part embrane method drinking water deep treatment process, and it can realize that nf membrane is difficult for polluting, and the pretreatment unit flow process is short, is easy to upgrading, the purpose that method for pretreating running cost is low.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of two-part embrane method drinking water deep treatment process may further comprise the steps successively:
A: Xiang Shuizhong is according to the ratio dosing coagulant of 10mgPAC/L water and fully stirring; Add Powdered Activated Carbon and fully stir according to the ratio of 2mgPAC/L water, per 2 days spoil disposals of mud discharging mouth 1 time make in the former water PM for particulate matter form alumen ustum with the partial organic substances molecule through the enhanced coagulation effect and precipitate;
B: aeration in the water of MBR pond, steam-water ratio is 20:1, makes the dissolved oxygen concentration of MBR district mixed solution in the pond be higher than 7mg/L, mixed solution and MBR film are controlled at 1h duration of contact; Remove ammonia nitrogen in the water, nitrate nitrogen and can biochemical organic carbon through biomembranous biochemical action:
C: with the aperture is that the curtain formula MBR film of 0.2-0.4 μ m is immersed in the mixed solution, sees through MBR film film silk 20L/ (m through make mixed solution with peristaltic pump negative pressure 10Kpa suction mode
2H) flow water outlet; Remove suspended particulate and macromole in the water through filteration:
D: nf membrane is filtered: the molecular weight cut-off of said nf membrane is 200-260 dalton, and filter pressure is controlled at 0.5-0.6MPa, and producing water ratio is controlled at 70%-80%, and the condensed water of nf membrane all is back to the MBR pond; Remove underwater micro-organic matter and mikrobe through the nanofiltration crown_interception:
E: the back flushing operation, the soaking and washing mode is adopted in back flushing, and clean-out system is a Hydrogen chloride, and soak time is 12h-15h.
Second technical problem to be solved by this invention just provides a kind of two-part embrane method drinking water deep treatment system that adopts above-mentioned technology, and it comprises: Powdered Activated Carbon adsorbs combined reinforced coagulation MBR reaction tank and nanofiltration membrane component 119; Described Powdered Activated Carbon adsorbs combined reinforced coagulation MBR reaction tank processes integral type, and it comprises: water inlet mixing section 101, enhanced coagulation adsorption precipitation working zone 102 and biochemical reaction membrane filtration working zone 103, each section have water channel to be communicated with successively;
Described water inlet mixing section 101 is a tubular coagulation tempering tank 107, establishes flash mixer 106 in it, and coagulation tempering tank 107 is intake, advanced medicine through volume pump 109 from the medicine pond from raw water tubes through intake pump 104;
Said enhanced coagulation working zone 102 is a coagulative precipitation tank 112, establishes whisking appliance 110 in it, imports the output of described coagulation tempering tank 107;
Said biochemical action membrane filtration working zone 103 is MBR pond 118; The pond inner bottom part is provided with the external air compressor machine of aeration tube 113 123, top is curtain formula MBR membrane module 114; The water side 115 of said MBR film is connected with said pump 116, carries out water outlet with the mode of peristaltic pump suction;
The nf membrane feed-water end 120 of described nanofiltration membrane component 119 through high pressure intake pump 116 from the concentrate recirculation of 103 water inlets of described biochemical reaction membrane filtration working zone, dense water end (W.E.) 122 to described water inlet mixing section 101, from the water side 121 output water purification.
Building at the bottom of the described MBR pond is 60 ° of slope shapes, and per 2 days spoil disposals of mud discharging mouth 1 time is arranged at the bottom of the pond, and the MBR pond is divided into aeration and sedimentation district and membrane biological reaction district, and its TV is an aquifer yield in 1 hour.
Coagulating agent of the present invention adopts poly-ferric chloride solution; Described coagulant dosage system comprises volume pump 109; Said tempering tank 107 is cylindrical cavity for the inner profile that flash mixer 106 is housed, said flash mixer 106 maximum speed of revolution 1350r/min.Said coagulative precipitation tank 112 is the cavity of inclined-plane, 60 ° of angles, built-in stirrer 110 for bottom and level.Said MBR reaction tank 118 is the cavity of 4 layers of MBR compartment parallel connection, and the MBR pond is divided into aeration and sedimentation district and membrane biological reaction district, and its TV is an aquifer yield in 1 hour, and every compartment bottom is provided with aeration tube and is connected with air compressor machine 123, and the MBR film is connected with pump 116.
Below the working process of two-part membrane process drinking water deep treatment system of the present invention is specified:
Former water promotes through feed-water end 105 through intake pump 104 and gets into tempering tank 107; Volume pump 109 through water sprayer with coagulant dosage in feed-water end 105; Under flash mixer 106 stirs, in cavity 107, mix, mixed water inlet gets into coagulative precipitation tank 112 through communication port 108, regularly in the pond, adds Powdered Activated Carbon; Reaction 30min forms granule sludge and is deposited at the bottom of the V-type pond, regularly spoil disposal.
Mixed solution through coagulation gets into the MBR reaction tank through riser 111, under aeration condition, removes the nutrient pollutant in the water by microbial process, through the water outlet of MBR membrane filtration.
The water outlet in MBR pond promotes the back at HPP and gets into the nf membrane system, working pressure 0.5-0.6MPa, and producing water ratio 70%-80%, dense water directly backflow advance tempering tank.
Beneficial effect: process program of the present invention can effectively be removed the conventional pollutent in the water, the little pollution organism and the trace toxic pollution substance of difficult degradation; Do not have poisonous and hazardous by product to generate, and realized the dense water purification processing of nanofiltration technique through concentrate recirculation.Two-part combined films of the present invention technical process is short, floor space is little, and working cost is cheap relatively, adapts to the upgrading demand of the conventional drinking water purification process of existing conventional drinking water plant, has very high practicality.
Description of drawings
Fig. 1 is a two-part membrane process drinking water deep treatment process embodiment process flow sheet of the present invention;
Fig. 2 is that two-part membrane process drinking water deep treatment system embodiment of the present invention forms and interface chart;
Fig. 3. be the front view of the combined reinforced coagulation MBR of charcoal absorption in embodiment of the invention device;
Fig. 4 is the vertical view of Fig. 3;
Fig. 5 is the left view of Fig. 3;
Fig. 6 is the sectional view of Fig. 4.
Among the figure: water inlet mixing section 101, coagulation-deposition working zone 102, biochemical membrane filtration working zone 103, intake pump 104, feed-water end 105, flash mixer 106, tempering tank 107, tempering tank water side 108, metering chemicals feed pump 109, whisking appliance 110, riser 111, coagulative precipitation tank 112, aeration tube 113, curtain formula MBR membrane module 114, MBR film water side 115, HPP 116, aeration tube communication port 117, MBR reaction tank 118, nanofiltration membrane component 119, nf membrane feed-water end 120; Nf membrane water side 121; The dense water end (W.E.) 122 of nf membrane, air compressor machine 123.
Embodiment
The present invention will be described below in conjunction with accompanying drawing and embodiment:
See also Fig. 1, embodiments of the invention-two-part membrane process drinking water deep processing technological flow figure specifically comprise step: first makes through the enhanced coagulation effect that PM for particulate matter and partial organic substances molecule form the alumen ustum deposition in the former water; Second removes ammonia nitrogen in the water, nitrate nitrogen and can biochemical organic carbon through biomembranous biochemical action; The 3rd through suspended particulate and macromole in the filteration removal water; Four-way is crossed the nanofiltration crown_interception and is removed underwater micro-organic matter and mikrobe.
In selection process scheme of the present invention, the said the first step is specially: Xiang Shuizhong is according to the ratio dosing coagulant of 10mgPAC/L water and fully stirring; Ratio according to 2mgPAC/L water adds Powdered Activated Carbon and fully stirring; The first step is specially the adsorption of the coagulation that utilizes coagulating agent and Powdered Activated Carbon and removes suspended particle and partial organic substances in the water; PM for particulate matter and organism form flco through coagulation and under the charcoal absorption effect, form large-size particles in the removal process, and most particles form mud through precipitating action and obtain removing.
Second step of the present invention is removed the trophicity organism in the water through the biochemical action of mikrobe; Be specially: with the vapor-liquid ratio 20:1 air that in the pond, exposes to the sun; Make the dissolved oxygen concentration of MBR district mixed solution in the pond be higher than 7mg/L, hydraulic detention time also is that mixed solution fully contacts 1 hour with film.
The 3rd step of the present invention is removed suspended particulate and macromole in the water through filteration; Be specially: curtain formula MBR membrane module is immersed in the MBR pond; Make in the pond mixed solution see through the water outlet of film silk with peristaltic pump suction mode, the 3rd step was specially: the MBR membrane material is PVDF (pvdf), 0.2 micron in aperture; Filter pressure 10KPa negative pressure, flux 20L/ (m
2H), membrane module submergence 10cm.
Be specially the crown_interception that utilizes nf membrane in the 4th step described in the optimal technical scheme of the present invention and remove underwater micro-organic matter and mikrobe; The molecular weight cut-off of said nf membrane is 200-260 dalton, and filter pressure is controlled at 0.5-0.6MPa, and producing water ratio is controlled at 70%-80%; Concentrate recirculation is to coagulation basin; The soaking and washing mode is adopted in back flushing, and clean-out system is a Hydrogen chloride, and soak time is 12h-15h.
See also Fig. 2 to Fig. 6, two-part membrane process drinking water deep treatment system embodiment of the present invention, Powdered Activated Carbon adsorbs combined reinforced coagulation MBR reaction tank structure iron.
A kind of two-part membrane process drinking water deep treatment system; Comprise that Powdered Activated Carbon adsorbs combined reinforced coagulation MBR reaction tank; Shown in Fig. 2 to 6, it comprises: enhanced coagulation, adsorption precipitation working zone 102 and biochemical reaction, membrane filtration working zone 103, and wherein said water inlet mixing section 101 is connected with coagulating sedimentation working zone 102; Said coagulating sedimentation working zone 102 links to each other with said biochemistry filtered working zone 103, and said biochemistry filtered working zone 103 cuts assembly 119 with nanofiltration and links to each other.
In selection process scheme of the present invention: said enhanced coagulation working zone 102 comprises: water inlet mixing section 101, intake pump 104, coagulation tempering tank 107, flash mixer 106, volume pump 109; The flat intake pump 104 of wherein said liquid level is connected with feed-water end 105; Said tempering tank water side 108 is connected with coagulative precipitation tank; Said flash mixer 106 is immersed in the tempering tank, and said volume pump 109 water sides are connected with feed-water end 105, and said whisking appliance 110 is immersed in the coagulative precipitation tank 112.
Said biochemical action, membrane filtration working zone 103 comprise: aeration tube 113, curtain formula MBR membrane module 114; Wherein, Said curtain formula MBR membrane module 114 is immersed in the 118 interior liquid of said MBR pond; The water side 115 of said MBR film is connected with said pump 116, and said aeration tube 113 is fixed in 118 bottoms, said MBR pond.
Coagulating agent in optimal technical scheme of the present invention adopts poly-ferric chloride solution; The coagulant dosage system comprises volume pump 109; Tempering tank 107 is the inner cylinder bodily form cavity that flash mixer 106 is housed; Flash mixer 106 maximum speed of revolution 1350r/min, coagulative precipitation tank 112 is the cavity that bottom and level are inclined-plane, 60 ° of angles, built-in stirrer 110, MBR reaction tank 118 is the cavitys of 4 layers of MBR compartments parallel connection; Every compartment bottom is provided with aeration tube and is connected with air compressor machine, and the MBR film is connected with pump 116.
Below the working process of two-part membrane process drinking water deep treatment system of the present invention is specified: former water promotes through feed-water end 105 through intake pump 104 and gets into tempering tanks 107; Said volume pump 109 through water sprayer with coagulant dosage in feed-water end 105;, in cavity 107, mixes by flash mixer 106 under stirring; Mixed water inlet gets into coagulative precipitation tank 112 through communication port 108; Regularly in the pond, add Powdered Activated Carbon, reaction 30min forms granule sludge and is deposited at the bottom of the V-type pond, regularly spoil disposal.
Mixed solution through coagulation gets into the MBR reaction tank through riser 111, under aeration condition, removes the nutrient pollutant in the water by microbial process, through the water outlet of MBR membrane filtration.
The water outlet in MBR pond promotes the back at HPP and gets into the nf membrane system, working pressure 0.5-0.6MPa, and producing water ratio 70%-80%, dense water directly backflow advance tempering tank.
Be through the healthy water after the purification of two ends membrane process through the final outflow water end 121 after the above two-part membrane process drinking water deep treatment system.
Claims (4)
1. two-part embrane method drinking water deep treatment process may further comprise the steps successively:
1) Xiang Shuizhong is in the ratio dosing coagulant of 10mgPAC/L water, throw Powdered Activated Carbon in the ratio of 2mgPAC/L water, fully stir mixed solution, mixed solution stops 30min ~ 60min in coagulative precipitation tank;
2) aeration in the mixed solution of MBR pond, steam-water ratio 20:1 makes the dissolved oxygen concentration of mixed solution be higher than 7mg/L, and mixed solution fully contacts 1h ~ 2h with the MBR film;
3) be that the curtain formula MBR film of 0.2-0.4 μ m is immersed in the mixed solution with the aperture, through the water pump suction with negative pressure 20KPa ~ 100KPa, flow 20L/ (m
2H) ~ 30 L/ (m
2H) water outlet;
4) the nf membrane filtration step 3) water outlet, make mixed solution see through the water outlet of nf membrane film silk with peristaltic pump suction mode, the molecular weight cut-off of nf membrane is 200-260 dalton, filter pressure 0.5-0.6MPa, producing water ratio 70%-80%, concentrate recirculation is to step 1);
5)When the nf membrane flux drops to 50%, nf membrane is carried out soaking and washing, clean-out system is a Hydrogen chloride, and soak time is 12h-15h.
2. two-part embrane method drinking water deep treatment system that adopts two-part embrane method drinking water deep treatment process as claimed in claim 1, it is characterized in that comprising: Powdered Activated Carbon adsorbs combined reinforced coagulation MBR reaction tank and nanofiltration membrane component (119); Described Powdered Activated Carbon adsorbs combined reinforced coagulation MBR reaction tank processes integral type, and it comprises: water inlet mixing section (101), enhanced coagulation adsorption precipitation working zone (102) and biochemical reaction membrane filtration working zone (103), each section have water channel to be communicated with successively;
Described water inlet mixing section (101) is a tubular coagulation tempering tank (107), establishes flash mixer (106) in it, and coagulation tempering tank (107) is intake, advanced medicine through volume pump (109) from the medicine pond from raw water tubes through intake pump (104);
Said enhanced coagulation working zone (102) is a coagulative precipitation tank (112), establishes whisking appliance (110) in it, imports the output of described coagulation tempering tank (107);
Said biochemical action membrane filtration working zone (103) is MBR pond (118); The pond inner bottom part is provided with the external air compressor machine of aeration tube (113) (123), top is curtain formula MBR membrane module (114); The water side of said MBR film (115) is connected with said pump (116), carries out water outlet with the mode of peristaltic pump suction;
The nf membrane feed-water end (120) of described nanofiltration membrane component (119) through high pressure intake pump (116) from concentrate recirculation to the described water inlet mixing section (101) of described biochemical reaction membrane filtration working zone (103) water inlet, dense water end (W.E.) (122), from the water side (121) output water purification.
3. two-part embrane method drinking water deep treatment system according to claim 2 is characterized in that: described coagulative precipitation tank (112) is the cavity of inclined-plane, 60 ° of angles, built-in stirrer (110) for bottom and level.
4. the system of two-part embrane method drinking water deep treatment process according to claim 3; It is characterized in that: said MBR pond (118) is the cavity of 4 layers of MBR compartment parallel connection; The MBR pond is divided into aeration and sedimentation district and membrane biological reaction district; Its TV is an aquifer yield in 1 hour, and every compartment bottom is provided with aeration tube and is connected with air compressor machine (123), and the MBR film is connected with pump (116).
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| CN 201110380992 CN102531278B (en) | 2012-03-01 | 2012-03-01 | Process and system for deeply treating drinking water through two-section membrane method |
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|---|---|---|---|
| CN 201110380992 CN102531278B (en) | 2012-03-01 | 2012-03-01 | Process and system for deeply treating drinking water through two-section membrane method |
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| CN102531278B CN102531278B (en) | 2013-04-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110451692A (en) * | 2019-09-03 | 2019-11-15 | 湖南城市学院 | A kind of water purifying treating method based on absorption, separation of solid and liquid |
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| CN102050529A (en) * | 2009-10-28 | 2011-05-11 | 轻工业环境保护研究所 | Immersed water treatment device of inner circulating membrane coagulation reactor |
| CN102134132A (en) * | 2011-04-20 | 2011-07-27 | 浙江工商大学 | Method for preparing drinking water by using nano-filtration membrane under sudden water pollution accident |
| CN102320706A (en) * | 2011-07-08 | 2012-01-18 | 上海希沃环境科技有限公司 | System for deep recovery and treatment of coking wastewater biochemical effluent |
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2012
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301671A (en) * | 1999-12-30 | 2001-07-04 | 同济大学 | Purifying technology for micro polluted water source |
| JP2003175397A (en) * | 2001-09-25 | 2003-06-24 | Itakura Kogyo:Kk | Water purification method, solid flocculation-filter medium and water-purification device |
| CN102050529A (en) * | 2009-10-28 | 2011-05-11 | 轻工业环境保护研究所 | Immersed water treatment device of inner circulating membrane coagulation reactor |
| CN102134132A (en) * | 2011-04-20 | 2011-07-27 | 浙江工商大学 | Method for preparing drinking water by using nano-filtration membrane under sudden water pollution accident |
| CN102320706A (en) * | 2011-07-08 | 2012-01-18 | 上海希沃环境科技有限公司 | System for deep recovery and treatment of coking wastewater biochemical effluent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110451692A (en) * | 2019-09-03 | 2019-11-15 | 湖南城市学院 | A kind of water purifying treating method based on absorption, separation of solid and liquid |
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