CN101306906A - Method for treating micro-polluted water - Google Patents
Method for treating micro-polluted water Download PDFInfo
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- CN101306906A CN101306906A CNA2008101022159A CN200810102215A CN101306906A CN 101306906 A CN101306906 A CN 101306906A CN A2008101022159 A CNA2008101022159 A CN A2008101022159A CN 200810102215 A CN200810102215 A CN 200810102215A CN 101306906 A CN101306906 A CN 101306906A
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Abstract
The invention relates to a method for processing micro-polluted water. The method utilizes the technology of integrating a membrane bioreactor with coagulating sedimentation and biological denitrogeneration, overcomes the defects of the processing technology of a conventional membrane bioreactor, realizes stable treatment effect, can simultaneously remove organic substances, nitrogen, phosphor and chromaticity in the water, and has the good effect of wide application range.
Description
[technical field]
The invention belongs to technical field of waste water processing.More specifically, the present invention relates to a kind of treatment process of micro-polluted water.
[background technology]
Along with improving constantly of China's living standards of the people, people are also more and more higher to the requirement of environmental quality.People need a large amount of amusement and recreation landscape waters on the one hand, and on the one hand a large amount of rivers and lakes surface water body is because of suffering to pollute the material and cultural life demand that can not satisfy the people.For this reason the parties concerned drop into substantial contribution to pollutant load higher be the water source with sewage work's secondary water-break, the micro-polluted surface water that polluted by industrial or agricultural and sanitary sewage carries out Treatment for Reuse.
Membrane bioreactor is a kind of new and effective reused water processing method that develops in recent years, this technology organically combines membrane separation technique and traditional wastewater biologic treating technique, high efficiency separation effect with film replaces traditional precipitation and filtration procedure, make activated sludge particles and most microorganism be retained in the biological reaction tank, clear liquid behind the membrane sepn is extracted out from the film silk by vacuum primingpump, thereby can have higher sludge concentration in the reaction tank.It is little to compare its floor space of traditional sewage water treatment method, and stable effluent quality is good, and can remove most pathogenic micro-organisms.
Known integral type film biological reactor is directly to be immersed in film group device in the bio-reactor, separation by micro-filtration or ultra-filtration membrane, make activated sludge particles and most microorganism be retained in the bio-reactor, clear liquid behind the membrane sepn is extracted out by vacuum primingpump, thereby can have higher sludge concentration in the reactor.It is little to compare its floor space of traditional sewage water treatment method, and stable effluent quality is good, and Biosafety degree height.
Along with the continuous progress of water technology and people to the continuing to increase of amusement and recreation water demand amount, contaminated surface water has been become common recognition as the bigger view reuse water resource of a kind of water yield.At present more as the research of drinking water treatment for the lower micro-polluted surface water of pollutant load; The research of handling as the view reuse water for the higher micro-polluted surface water of pollutant load then seldom; For being the water source with sewage work's secondary water-break, contain a large amount of hardly degraded organic substances, the research of carbon source the is not enough higher relatively bad V class surface water of nitrogen and phosphorus content handles ground Table III class water body (except the total nitrogen) is then still less.
Conventional biologic treating technique even adopt the membrane bioreactor method, if do not adopt an effective measure, also can't guarantee the removal effect to hardly degraded organic substance; Bio-denitrification technology also must take certain measure could keep ideal denitrogenation level under low ratio of carbon to ammonium; Independent coagulating sedimentation is difficult to nitrogen phosphorus and hardly degraded organic substance are effectively removed simultaneously.As water for scenic environment use, it is essential removing organism and nitrogen phosphorus, also needs to slough the colourity of water outlet simultaneously.Membrane bioreactor is combined with coagulating sedimentation and bio-denitrification technology, and take the necessary measures and can make it have the deficiency that advantage separately can overcome each side again, acting in conjunction is satisfied water for scenic environment use to requirements in water quality.
[summary of the invention]
[problem that invention will solve]
The treatment process that the purpose of this invention is to provide a kind of micro-polluted water, this method overcomes many defectives that conventional Membrane Bioreactor for Wastewater Treatment technology exists, and therefore, is that a kind of use range is wide, treatment effect is stable, can remove the method for processing micro polluted water of anhydrate middle organism, nitrogen, phosphorus, colourity simultaneously.
[technical scheme]
The present invention realizes by following manner.
A kind of treatment process of micro-polluted water, the step of its this method of feature is as follows:
A, micro-polluted water are removed the mechanical impurity of the different size that exists in this micro-polluted water by pretreatment system 1;
B, coagulating agent add-on system 7 are added to the part of coagulating agent in the pretreating sewage of step a, and the coagulating agent addition is that coagulating agent and pretreating sewage weight ratio are 5-30*10
-6: 1, this pretreating sewage enters in the settling tank 2, stops 15-40 minute, isolates supernatant liquor and precipitating sludge, contains the most of total phosphorus and a part of organism that exist in this sewage in the precipitating sludge;
The precipitating sludge of c, step b) enters sludge treating system 6, and supernatant liquor adds carbon source by carbon source add-on system 8, and remix evenly obtains containing the mixed solution of additional carbon;
The additional carbon mixed solution that contains of d, step c) enters anoxic pond 3 and mixed anoxic pond 3 0.5-1.5 hour with the nitrification liquid that returns from membrane bioreactor 4, carries out the denitrification denitrogenation reaction and obtains denitrification liquid, and the reflux ratio of described nitrification liquid is 100-600%;
The denitrification liquid of e, step d) enters membrane bioreactor 4 to carry out nitration reaction 2-5 hour, and ammonia nitrogen is converted into nitric nitrogen, and the nitrification liquid that obtains turns back to anoxic pond 3 then; Membrane bioreactor 4 carries out carburizing reagent simultaneously and removes organism, and the assimilation dephosphorization; Coagulating agent add-on system 7 is added to another part of coagulating agent in the membrane bioreactor 4, removes remaining hardly degraded organic substance and the phosphorus that exceeds the microorganism psychological need, and the coagulating agent addition is that coagulating agent is 5-30*10 with the weight ratio of disposing of sewage
-6: 1; Residual mud enters described sludge treating system 6;
F, the clear liquid after membrane bioreactor 4 separates are sent into ozone contact tank 5 usefulness ozone and are decoloured and disinfect the water that obtains meeting the requirements.
On meaning of the present invention, micro-polluted water should be appreciated that and polluted but by still spendable former water after handling.Described pollution should comprise that physical contamination, chemicals pollute or biological substance pollutes, and physical contamination is for example as plastics bag, leaf, hair, soil ulmin etc.; Chemicals pollute for example as agricultural chemicals, chemical fertilizer, sanitary sewage, trade effluent; Biological substance pollutes for example as intestinal bacteria.
Pretreatment system of the present invention is made up of coarse rack, lift pump room, fine fack, settling pit and ultra-fine grid.They connect in turn, finish the pre-treatment to former water, and wherein a part of processing unit can omit according to practical situation.Remove the mechanical impurity of the different size that exists in this micro-polluted water, for example sand, stone, wood chip, fur, pasture and water etc. by this pretreatment system.
For the present invention, described coarse rack is to be used for removing the bigger impurity of former water particle diameter, prevents to stop up lift pump, and its interval of grid strip is 10-40mm.
Described lift pump room is made up of the buildings of some sewage pumps and placement lift pump, and its function is that lifting sewage is to satisfy follow-up sewage disposal flow process and vertical linking requirement.
Described fine fack is the normal operation that the impurity of medium particle diameter in the former water of removal prevents to disturb settling pit, and its interval of grid strip is 3-10mm.
Described settling pit is made up of precipitation zone, sand catcher and sand removal pump, and its function is to remove proportion in the sewage greater than 1 impurity, prevents that it from causing wearing and tearing to water treating equipment and destroy.
Described ultra-fine grid is to remove the less impurity of particle diameter in the former water, prevents from membrane module is caused damage, and its interval of grid strip is 0.5-3mm.
All these equipment all are product solds in the market, and for example Jiangsu Runtian Water Industry Equipment Co., Ltd. is with trade(brand)name RLHG type rotary type grid sewage-removing machine product sold.
According to a kind of preferred implementation, in this pretreating sewage, be added in normally used in the art coagulating agent, so that make the organism of particulate state and gel state in the sewage and total phosphorus flocculation generate precipitation, enter settling tank again.Described coagulating agent is a normally used coagulating agent in the water treatment, for example they are that one or more are selected from the HPACS-215 type that Beijing Wan Shui water purification agent company produces, PAC-1 type and PAC-5 type coagulating agent, the technical grade polymerize aluminum chloride (premium grads) that Kaimiwote (Yixing) Purifying Agent Co., Ltd. produces, technical grade polymerize aluminum chloride (acceptable end product), high-purity polymerize aluminum chloride, polymerize aluminum chloride and compound coagulant that blue ripple chemical company limited (Yixing) produces, the water purification agent that Beijing Yameng Environmental Protection Technology Co., Ltd. produces, the coagulating agent of the water purification agent that Kelin, Beijing Wei Er chemical industry company limited produces.The coagulating agent of the technical grade polymerize aluminum chloride (premium grads) that preferably, described coagulating agent is one or more PAC-5 type coagulating agent that are selected from Beijing Wan Shui water purification agent company and produce, Kaimiwote (Yixing) Purifying Agent Co., Ltd. produces, the water purification agent that Wei Er chemical industry company limited in Kelin, Beijing produces.More preferably, described coagulating agent is the coagulating agent of the technical grade polymerize aluminum chloride (premium grads) of one or more PAC-5 type coagulating agent that are selected from the production of Beijing Wan Shui water purification agent company, Kaimiwote's production.
According to the present invention, described coagulating agent add-on system is connected to form through volume pump and line mixer by the coagulating agent system of batching.
The described coagulating agent system of batching is made up of coagulating agent Preparation tank, coagulating agent storage tanks and agitator.Its function is the used coagulating agent medicine of preparation coagulating sedimentation, and the coagulating agent for preparing is stored for future use.
Described volume pump is normally used in the art volume pump, and for example U.S.'s Paasche Fei Da company is with trade(brand)name 150 series mechanical METERING DIAPHRAGM PUMPS product solds.
Described line mixer is made up of line mixer, chemical feed pipe, ring flange and joint bolt, and its function is coagulating agent and pretreating sewage is instantaneous mixes.
This pretreating sewage stopped in settling tank 15-40 minute, and its sewage is isolated supernatant liquor and precipitating sludge by precipitating action, contained the most of total phosphorus and a part of organism that exist in this sewage in this precipitating sludge.
This precipitating sludge enters sludge treating system after separation.Described sludge treating system is made up of storage basin, sludge thickener, sludge press filtration machine.Its function is that the water ratio that reduces mud is convenient to its transportation and is disposed.
Meanwhile, add carbon source by the carbon source add-on system in described supernatant liquor, remix evenly obtains containing the mixture of additional carbon, enters anoxic pond.
According to the present invention, described carbon source add-on system is connected to form through peristaltic pump and line mixer by the carbon source system of batching.
The described carbon source system of batching is made up of carbon source Preparation tank, carbon source storage tanks and agitator.Its function is the used carbon source solution of preparation additional carbon, and the carbon source solution for preparing is stored for future use.
Described peristaltic pump is normally used in the art peristaltic pump, and for example Baoding LanGe constant flow pump Co., Ltd is with the accurate peristaltic pump product sold of trade(brand)name BT00-600M.
Described line mixer is made up of line mixer, chemical feed pipe, ring flange and joint bolt, and its function is additional carbon and pretreating sewage is instantaneous mixes.
Described carbon source is a normally used carbon source in the water treatment.For example described carbon source is one or more carbon sources that are selected from methyl alcohol, ethanol, glucose, starch, and for example magnificent shield far away scientific ﹠ trading Co., Ltd. in the industrial chemical industry of Beijing state unit company limited, Beijing, permanent Tonghua, Beijing worker company limited, Beijing Ribio Biotech. Inc., the permanent thing in Beijing are prosperous reaches the methyl alcohol that chemical industry limited liability company produces.Ethanol, glucose, starch can be product solds in the market.
Then, the described additional carbon mixture that contains enters anoxic pond and the nitrification liquid that returns from membrane bioreactor and mixes anoxic pond and carry out the denitrification denitrogenation reaction, obtains denitrification liquid.The described weight ratio that contains additional carbon mixture and nitrification liquid is 1: 1-6.Preferably, the weight ratio of described carbonaceous sources mixture and nitrification liquid is 1: 1-4.More preferably, the weight ratio of described carbonaceous sources mixture and nitrification liquid is 1: 2-3.
On meaning of the present invention, described anoxic pond is a rectangular configuration, in establish agitator.
Then, described denitrification liquid enters membrane bioreactor with the coagulating agent that adds by the coagulating agent add-on system, mainly removes ammonia nitrogen, residual organic and total phosphorus.
Described membrane bioreactor is formed by being immersed in film group device in the mixed solution, gas blower, suction pump, online soup cleanser, membrane bioreactor Controlling System, reflux pump.Film group device is immersed in the membrane bioreactor, and the film silk outside is an active sludge intermixture, and the film silk is inboard for filtering the gained clear liquid; Gas blower is by being positioned at aeration tube under the film group device to the membrane cisterna oxygen supply and form that air-water two phase flow is moving to be polluted with controlling diaphragm; Suction pump makes the mixed solution in the membrane bioreactor finish solid-liquid separation through the film silk by the negative pressure that himself produces, and film silk filtration gained clear liquid is pumped out and deliver to ozone contact tank; Online soup cleanser cleans it by the cleaning agent that the film silk in film group device oppositely injects regulation, recovers the filtration capacity of film group device; The membrane bioreactor Controlling System is controlled automatically to the operation of each equipment of system, guarantees the normal steady running of system; Reflux pump is delivered to anoxic pond with the nitrated mixed solution in the membrane bioreactor in described ratio and carries out the denitrification denitrogenation reaction.Wherein operation assurance membrane bioreactor air demand is stable in turn for gas blower; The suction pump intermittent operation, its suction time and idle time are provided with at interval as required; Online soup cleanser is according to the chocking-up degree and the length intermittent operation of Clean after every time of film; Reflux pump moves after adjusting flow as required continuously.
According to the present invention, described film group device is curtain formula or pole structure.Its function is a filter activity mud output clear liquid, and nitrifier is dammed in reactor.The film group device that the present invention uses is normally used in the art curtain formula or pillar film group device, the product that company of for example Japanese Asahi Chemical Industry produces.
Described gas blower is a normally used gas blower when aeration in the art, and for example Pepsi moral machinery (Jiangsu) company limited is with trade(brand)name BK type three leaf roots blower product solds.This gas blower provides needed oxygen by aerating system for microorganism, and forms the development that the mobile controlling diaphragm of gas-liquid two-phase pollutes.
Described suction pump is in normally used in the art suction pump, and for example Shanghai Ke Yuan pump industry Manufacturing Co., Ltd is with trade(brand)name ZX type vacuum primingpump product sold.The negative pressure that this suction pump produces makes mixed solution finish solid-liquid separation through the film silk.
Described online soup cleanser is made up of drug storage groove and dosing pump, and its function is as required the cleaning agent solution that stores in the drug storage groove to be carried out daily clean and maintenance by dosing pump to film, recovers the filtration flux of membrane module.Described cleaning agent is normally used clean-out system, for example clorox, sodium hydroxide, citric acid, sulfuric acid.
Normally used pump when described reflux pump is denitrogenation in the art, its function are the nitrated mixed solution in the membrane bioreactor to be delivered to anoxic pond by a certain percentage carry out the denitrification denitrogenation reaction.
The reaction solution of handling in membrane bioreactor is that nitrification liquid turns back to anoxic pond, finishes denitrification.And enter ozone contact tank decolouring sterilization from the clear liquid that membrane bioreactor is separated, the decolouring sterilization utilization of clear liquid in ozone contact tank feeds ozone and finishes in ozone contact tank, ozone is from ozonizer, every cubic metre of water-ozone add-on is 1-5mg, the residence time of clear liquid in the decolouring pond is 5-20 minute, and the tail gas that contains ozone is discharged after the ozone layer destroying device decomposes.
Described ozonizer is a normally used ozonizer when preparing ozone in the art, and for example U.S. An Lisi company is with trade(brand)name SP series ozonizer product sold.
Described ozone layer destroying device is a normally used ozone layer destroying device when destroying ozone tail gas in the art, and for example Shenzhen hundred million can reach development in science and technology company limited with trade(brand)name ozone tail gas breaking plant product sold.
[beneficial effect]
Add described coagulating agent at settling tank and membrane bioreactor two places, both can guarantee system's phosphor-removing effect, can prevent the unbalance microorganism active that influences of biochemical section carbon-phosphorus ratio again, both can improve the clearance of hardly degraded organic substance, can prevent that again biochemical section carbon source is low excessively, therefore, reach the stable purpose of treatment effect.
Add the carbon source good mixing effect by line mixer to anoxic pond, an amount of carbon source can satisfy the denitrogenation needs, and excessive carbon source can decompose in aerobic membrane cisterna fully, has not only guaranteed denitrification effect but also system sludge concentration can have been maintained higher level.
Compared with prior art, adopt method of the present invention that the nitrogen phosphorus in the micro-polluted water and the clearance of hardly degraded organic substance are obviously improved, wherein the clearance of chemical oxygen demand (COD) can improve more than 50%, the clearance of total nitrogen can improve more than 80%, the clearance of total phosphorus can improve more than 50%.
[description of drawings]
Fig. 1 is a micro-polluted water treatment scheme synoptic diagram of the present invention;
Fig. 2 is a membrane bioreactor of the present invention.
Wherein: 1, pretreatment system; 2, settling tank; 3, anoxic pond; 4, membrane bioreactor; 5, ozone contact tank; 6, sludge treating system; 7, coagulating agent medicine system; 8, carbon source dosing system; 4-1, film group device; 4-2, gas blower; 4-3, suction pump; 4-4, online soup cleanser; 4-5, membrane bioreactor Controlling System; 4-6, reflux pump, 7-1, the coagulating agent system of batching; 7-2, line mixer; 8-1, the carbon source system of batching; 8-2, line mixer;
Arrow is depicted as current or air flow line in the accompanying drawing.
[embodiment]
Following embodiment is described with reference to the accompanying drawings the present invention.
Present embodiment is bad V class Beijing Wenyu River river to be handled reach surface water III class level (TN＜15mg/L), day output is 10 tons.Former water is taken from 1.46km place, Tuan Zha upstream, Wenyu River Shandong.
This embodiment micro-polluted water treatment step is as follows:
A, micro-polluted water are removed the mechanical impurity of the different size that exists in this micro-polluted water by pretreatment system;
B, coagulating agent add-on system 7 are added to the part of coagulating agent in the pretreating sewage of step a), and the coagulating agent addition is that coagulating agent and pretreating sewage weight ratio are 10*10
-6: 1, this pretreating sewage enters in the settling tank 2, stops 25 minutes, isolates supernatant liquor and precipitating sludge, contains the most of total phosphorus and a part of organism that exist in this sewage in the precipitating sludge;
The precipitating sludge of c, step b) is sent into sludge of sewage treatment plant treatment system 6 after collecting, and supernatant liquor adds methyl alcohol by carbon source add-on system 8, and remix evenly obtains containing the mixed solution of additional carbon;
The additional carbon mixed solution that contains of d, step c) enters anoxic pond 3 and mixed anoxic pond 3 1.0 hours with the nitrification liquid that returns from membrane bioreactor 4, carries out the denitrification denitrogenation reaction and obtains denitrification liquid, and the reflux ratio of described nitrification liquid is 300%;
The denitrification liquid of e, step d) enters membrane bioreactor 4 and carried out nitration reaction 2.5 hours, and ammonia nitrogen is converted into nitric nitrogen, and the nitrification liquid that obtains turns back to anoxic pond 3 then; Membrane bioreactor 4 carries out carburizing reagent simultaneously and removes organism, and the assimilation dephosphorization; Coagulating agent add-on system 7 is added to another part of coagulating agent in the membrane bioreactor 4, removes remaining hardly degraded organic substance and the phosphorus that exceeds the microorganism psychological need, and the coagulating agent addition is that coagulating agent is 5*10 with the weight ratio of disposing of sewage
-6: 1; Residual mud is sent into sludge of sewage treatment plant treatment system 6 after collecting;
F, the clear liquid after membrane bioreactor 4 separates are sent into ozone contact tank 5 usefulness ozone and are decoloured and disinfect the water that obtains meeting the requirements.
The pretreatment system of this embodiment is made up of lift pump and ultra-fine grid.They connect in turn, finish the pre-treatment to former water.Remove the mechanical impurity of the different size that exists in this micro-polluted water, for example sand, stone, wood chip, fur, pasture and water etc. by this pretreatment system.
In this embodiment, described lift pump is made up of lift pump, fixed support and hydraulic pipe-line, and its function is that lifting sewage is to satisfy follow-up sewage disposal flow process and vertical linking requirement.
Described ultra-fine grid is that the mechanical impurity of removing different size in the former water prevents from membrane module is caused damage, and its size interval of grid strip is 1.0mm.
Described lift pump is that the model that German Wei Le company produces is the submersible pump of PD-1100; Ultra-fine grid is for to process the hand basket grid that is of a size of the wide * height=300mm*300mm*300mm of long * voluntarily with stainless (steel) wire, and the stainless (steel) wire effective pore radius is 1.0mm.
In this pretreating sewage, be added in normally used in the art coagulating agent, so that make the organism of particulate state and gel state in the sewage and total phosphorus flocculation generate precipitation, enter settling tank again.Described coagulating agent is that Beijing Wan Shui water purification agent company produces, and model is the polymerize aluminum chloride of PAC-5, Al
2O
3Effective content is 10%.
Described coagulating agent add-on system is connected to form through volume pump and line mixer by the coagulating agent system of batching.
The described coagulating agent system of batching is made up of coagulating agent Preparation tank, coagulating agent storage tanks and agitator.Its function is the used coagulating agent medicine of preparation coagulating sedimentation, and the coagulating agent for preparing is stored for future use.
Described volume pump is the product that U.S. Paasche Fei Da company produces, and model is x003 and x007.
Described coagulating agent Preparation tank, coagulating agent storage tanks are normally used in the art chemical liquid grooves, and for Beijing Kai Delong industry and trade company limited produces, model is MC200L.
Described line mixer is made up of line mixer, chemical feed pipe, ring flange and joint bolt, and its function is coagulating agent and pretreating sewage is instantaneous mixes.
This pretreating sewage stopped in settling tank 25 minutes, and its sewage is isolated supernatant liquor and precipitating sludge by precipitating action, contained the most of total phosphorus and a part of organism that exist in this sewage in this precipitating sludge;
Described settling tank is a rectangular sedimentation tank, carbon steel structure, and the series connection of eight gallerys, each gallery is of a size of the wide * height=1500mm*100mm*300mm of long *, available depth 150mm, horizontal flow velocity 7.7mm/s.
This precipitating sludge is separating after the sludge of sewage treatment plant treatment system is sent in collection.Described sludge treating system is made up of storage basin, sludge thickener, sludge press filtration machine.Its function is that the water ratio that reduces mud is convenient to its transportation and is disposed.
Meanwhile, add methyl alcohol by the carbon source add-on system in described supernatant liquor, remix evenly obtains containing the mixture of additional carbon, enters anoxic pond.
Described carbon source add-on system is connected to form through peristaltic pump and line mixer by the carbon source system of batching.
The described carbon source system of batching is added by carbon source storage tanks and carbon source that groove forms.Its function is to store the used carbon source solution of additional carbon.
Described peristaltic pump is that Baoding LanGe constant flow pump Co., Ltd produces, and drive model is BT50-1J, and the pump head model is the DG-110 roller).
Described line mixer is made up of line mixer, chemical feed pipe, ring flange and joint bolt, and its function is additional carbon and pretreating sewage is instantaneous mixes.
The carbon source that this embodiment selects for use is the methyl alcohol that the industrial company in Beijing state garden produces.
Then, the described additional carbon mixture that contains enters anoxic pond and the nitrification liquid that returns from membrane bioreactor and mixes anoxic pond and carry out denitrification denitrogenation reaction 1.0h, obtains denitrification liquid.The described weight ratio that contains additional carbon mixture and nitrification liquid is 1: 3.
Described anoxic pond is a carbon steel structure, is of a size of the wide * height=800mm*400mm*1500mm of long *, available depth 1300mm; In establish agitator, power 0.37kw, double-layer paddle.
Then, described denitrification liquid enters membrane bioreactor reaction 2.5h with the coagulating agent that adds by the coagulating agent add-on system, mainly removes ammonia nitrogen, residual organic and total phosphorus.Described membrane bioreactor is formed by being immersed in film group device in the mixed solution, gas blower, suction pump, online soup cleanser, membrane bioreactor Controlling System, reflux pump.Film group device is immersed in the membrane bioreactor, and the film silk outside is an active sludge intermixture, and the film silk is inboard for filtering the gained clear liquid; Gas blower is by being positioned at aeration tube under the film group device to the membrane cisterna oxygen supply and form that air-water two phase flow is moving to be polluted with controlling diaphragm; Suction pump makes the mixed solution in the membrane bioreactor finish solid-liquid separation through the film silk by the negative pressure that himself produces, and film silk filtration gained clear liquid is pumped out and deliver to ozone contact tank; Online soup cleanser cleans it by the cleaning agent that the film silk in film group device oppositely injects regulation, recovers the filtration capacity of film group device; The membrane bioreactor Controlling System is controlled automatically to the operation of each equipment of system, guarantees the normal steady running of system; Reflux pump is delivered to anoxic pond with the nitrated mixed solution in the membrane bioreactor in described ratio and carries out the denitrification denitrogenation reaction.Wherein gas blower moves continuously and guarantees that the membrane bioreactor air demand is stable; The suction pump intermittent operation, per ten minutes suction period, its suction time is set to 8 minutes, and idle time is set to 2 minutes; Online soup cleanser is according to the chocking-up degree and the length intermittent operation of Clean after every time of film; Reflux pump moves after adjusting flow as required continuously.
Described membrane bioreactor is a carbon steel structure, is of a size of the wide * height=800mm*600mm*2600mm of long *, available depth 2200mm.Its hydraulic detention time is 2.5 hours, aeration rate be 8 cubic metres per hour, sludge concentration be 6 the gram every liter.
Described film group device is a pole structure, is immersed in the membrane bioreactor.It is membrane bioreactor Application Areas film group device commonly used, is the product that company of Japanese Asahi Chemical Industry produces, and material is a polyvinylidene difluoride (PVDF), film silk effective pore radius 0.1 μ m.Its function is a filter activity mud output clear liquid, and nitrifier is dammed in reactor.
Described gas blower is that the Qingdao lattice drench Korea S's electromagnetic type aeration pump that environmentfriendly products company limited sells, and model is DY-160.This gas blower provides needed oxygen by aerating system for microorganism, and forms the development that the mobile controlling diaphragm of gas-liquid two-phase pollutes.
Described suction pump is the suction pump that German Wei Le company produces, and model is PW-082EA.The negative pressure that this suction pump produces makes mixed solution finish solid-liquid separation through the film silk.
Described online soup cleanser is made up of drug storage groove and dosing pump.Its function is to carry out daily clean and maintenance to film, makes membrane module steady running under higher water flux.
Normally used pump when described reflux pump is denitrogenation in the art is immersed in the membrane bioreactor, and its function is the nitrated mixed solution in the membrane bioreactor to be delivered to anoxic pond by a certain percentage carry out the denitrification denitrogenation reaction.
The reaction solution of handling in membrane bioreactor is that nitrification liquid turns back to anoxic pond, finishes denitrification.And enter ozone contact tank decolouring sterilization from the clear liquid that membrane bioreactor is separated, the decolouring sterilization utilization of clear liquid in ozone contact tank feeds ozone and finishes in ozone contact tank, ozone is from ozonizer, every cubic metre of water-ozone add-on is 1.7mg, the residence time of clear liquid in the decolouring pond is 15 minutes, and the tail gas that contains ozone is discharged outdoor corner.
Described ozonizer is that U.S. An Lisi company produces, and model is SP-05.
Employing is " water and waste water check and analysis method (the 4th edition) ", and Wang Xinfang etc. are outstanding, and the China Environmental Science Press publishes method of describing in (2002), has analyzed the water quality of present embodiment treating water:
1, BOD: dilution inoculation method
2, COD: potassium dichromate process
3, NH3-N: nessler reagent light-intensity method
4, TN: Potassium Persulphate oxidation ultraviolet spectrophotometry
5, TP: molybdenum-antimony anti-spectrophotometric method
6, colourity: extension rate method
Total residue of 7, suspended substance: 103-105 ℃ oven dry
8, turbidity: portable turbidimeter method
9, coliform: multitube fermentation method
Many batches of water samples before and after handling are analyzed, and its analytical results is listed in the table below 1.
By in the above-mentioned table as can be known, adopt the effluent quality of the inventive method treating water to be much better than the reuse water standard and the ground Table III class water body standard (total nitrogen＜15mg/L), also surpassed original design effluent quality of National Environmental water.
The comparative example 1
The present embodiment target is bad V class Beijing Wenyu River river to be handled reach surface water III class level (TN＜15mg/L), day output is 2.5 tons.Former water is taken from 1.46km place, Tuan Zha upstream, Wenyu River Shandong.
A kind of treatment process of micro-polluted water, the step of this embodiment of its feature is as follows:
A, micro-polluted water are removed the mechanical impurity of the different size that exists in this micro-polluted water by pretreatment system 1;
The pretreating sewage of b, step a) enters anoxic pond 3 to be mixed anoxic pond 3 2.5 hours with the nitrification liquid that returns from membrane bioreactor 4, carried out the denitrification denitrogenation reaction and obtained denitrification liquid, and the reflux ratio of described nitrification liquid is 300%;
The denitrification liquid of c, step b) enters membrane bioreactor 4 and carried out nitration reaction 4.0 hours, and ammonia nitrogen is converted into nitric nitrogen, and the nitrification liquid that obtains turns back to anoxic pond 3 then; Membrane bioreactor 4 carries out carburizing reagent simultaneously and removes organism, and the assimilation dephosphorization; Residual mud is sent into sludge of sewage treatment plant treatment system 6 after collecting;
D, the clear liquid after membrane bioreactor 4 separates are sent into ozone contact tank 5 usefulness ozone and are decoloured and disinfect, and obtain system's water outlet.
The pretreatment system of this embodiment is made up of lift pump and ultra-fine grid.They connect in turn, finish the pre-treatment to former water.Remove the mechanical impurity of the different size that exists in this micro-polluted water, for example sand, stone, wood chip, fur, pasture and water etc. by this pretreatment system.
Described lift pump is made up of lift pump, fixed support and hydraulic pipe-line, and its function is that lifting sewage is to satisfy follow-up sewage disposal flow process and vertical linking requirement.
Described ultra-fine grid is that the mechanical impurity of removing different size in the former water prevents from membrane module is caused damage, and its size interval of grid strip is 1.0mm.
Described lift pump is a product sold in the market, and the model of producing for German Wei Le company is the submersible pump of PD-1100; Ultra-fine grid is for to process the hand basket grid that is of a size of the wide * height=300mm*300mm*300mm of long * voluntarily with stainless (steel) wire, and the stainless (steel) wire effective pore radius is 1.0mm.
This pretreating sewage enters anoxic pond and the nitrification liquid that returns from membrane bioreactor to be mixed anoxic pond and carries out denitrification denitrogenation reaction 2.5h, obtains denitrification liquid.
Described anoxic pond is a glass fibre reinforced plastic structure, is of a size of the wide * height=500mm*400mm*1500mm of long *, available depth 1300mm.
Then, described denitrification liquid enters membrane bioreactor reaction 4.0h, mainly removes ammonia nitrogen, organism and total phosphorus.Described membrane bioreactor is formed by being immersed in film group device in the mixed solution, gas blower, suction pump, online soup cleanser, membrane bioreactor Controlling System, reflux pump.Film group device is immersed in the membrane bioreactor, and the film silk outside is an active sludge intermixture, and the film silk is inboard for filtering the gained clear liquid; Gas blower is by being positioned at aeration tube under the film group device to the membrane cisterna oxygen supply and form that air-water two phase flow is moving to be polluted with controlling diaphragm; Suction pump makes the mixed solution in the membrane bioreactor finish solid-liquid separation through the film silk by the negative pressure that himself produces, and film silk filtration gained clear liquid is pumped out and deliver to ozone contact tank; Online soup cleanser cleans it by the cleaning agent that the film silk in film group device oppositely injects regulation, recovers the filtration capacity of film group device; The membrane bioreactor Controlling System is controlled automatically to the operation of each equipment of system, guarantees the normal steady running of system; Reflux pump is delivered to anoxic pond by a certain percentage with the nitrated mixed solution in the membrane bioreactor and carries out the denitrification denitrogenation reaction.Wherein gas blower moves continuously and guarantees that the membrane bioreactor air demand is stable; The suction pump intermittent operation, per 15 minutes suction period, its suction time is set to 13 minutes, and idle time is set to 2 minutes; Online soup cleanser is according to the chocking-up degree and the length intermittent operation of Clean after every time of film; Reflux pump moves after adjusting flow as required continuously.
In the present embodiment, described membrane bioreactor is a glass fibre reinforced plastic structure, is of a size of the wide * height=800mm*400mm*1500mm of long *, available depth 1300mm.Its hydraulic detention time is 4.0 hours, aeration rate be 4 cubic metres per hour, sludge concentration be 1.2 the gram every liter.
Described film group device is a pole structure, is immersed in the membrane bioreactor.It is the product that company of Japanese Asahi Chemical Industry produces for membrane bioreactor, and material is a polyvinylidene difluoride (PVDF), film silk effective pore radius 0.1 μ m.Its function is a filter activity mud output clear liquid, and nitrifier is dammed in reactor.
Described gas blower is that the Qingdao lattice drench Korea S's electromagnetic type aeration pump that environmentfriendly products company limited sells, and model is DY-120.This gas blower provides needed oxygen by aerating system for microorganism, and forms the development that the mobile controlling diaphragm of gas-liquid two-phase pollutes.
Described suction pump is the suction pump that German Wei Le company produces, and model is PW-082EA.The negative pressure that this suction pump produces makes mixed solution finish solid-liquid separation through the film silk.
Described online soup cleanser is made up of drug storage groove and dosing pump.Its function is to carry out daily clean and maintenance to film, makes membrane module steady running under higher water flux.
Normally used pump when described reflux pump is denitrogenation in the art is immersed in the membrane bioreactor, and its function is the nitrated mixed solution in the membrane bioreactor to be delivered to anoxic pond by a certain percentage carry out the denitrification denitrogenation reaction.
The reaction solution of handling in membrane bioreactor is that nitrification liquid turns back to anoxic pond, finishes denitrification.And enter ozone contact tank decolouring sterilization from the clear liquid that membrane bioreactor is separated, the decolouring sterilization utilization of clear liquid in ozone contact tank feeds ozone and finishes in ozone contact tank, ozone is from ozonizer, every cubic metre of water-ozone add-on is 1.7mg, the residence time of clear liquid in the decolouring pond is 15 minutes, and the tail gas that contains ozone is discharged outdoor corner.
Described ozonizer is that U.S. An Lisi company produces, and model is SP-05.
Employing is " water and waste water check and analysis method (the 4th edition) ", and Wang Xinfang etc. are outstanding, and the China Environmental Science Press publishes method of describing in (2002), has analyzed the water quality of present embodiment treating water:
1, BOD: dilution inoculation method
2, COD: potassium dichromate process
3, NH
3-N: nessler reagent light-intensity method
4, TN: Potassium Persulphate oxidation ultraviolet spectrophotometry
5, TP: molybdenum-antimony anti-spectrophotometric method
6, colourity: extension rate method
Total residue of 7, suspended substance: 103-105 ℃ oven dry
8, turbidity: portable turbidimeter method
9, coliform: multitube fermentation method
Many batches of water samples before and after handling are analyzed, and its analytical results is listed in the table below 2.
By in the above-mentioned table as can be known, COD, TN, TP many index do not reach the design effluent quality in the effluent quality of this embodiment treating water, (TN＜15mg/L) gap is bigger with the reuse water standard of National Environmental water and ground Table III class water body standard.
Claims (10)
1, a kind of treatment process of micro-polluted water, the step of its this method of feature is as follows:
A, allow micro-polluted water pass through pretreatment system (1), remove the mechanical impurity of the different size that exists in this micro-polluted water;
B, coagulating agent add-on system (7) are added to the part of coagulating agent in the pretreating sewage that step a) obtains, and the coagulating agent addition is that the weight ratio of coagulating agent and pretreating sewage is 5-30*10
-6: 1, this pretreating sewage enters in the settling tank (2), stops 15-40 minute, isolates supernatant liquor and precipitating sludge, contains the most of total phosphorus and a part of organism that exist in this sewage in the precipitating sludge;
The precipitating sludge of c, step b) enters sludge treating system (6), and supernatant liquor adds carbon source by carbon source add-on system (8), and remix evenly obtains containing the mixed solution of additional carbon;
The additional carbon mixed solution that contains of d, step c) enters anoxic pond (3) and mixed 0.5-1.5 hour anoxic pond (3) with the nitrification liquid that returns from membrane bioreactor (4), carry out the denitrification denitrogenation reaction and obtain denitrification liquid, the reflux ratio of described nitrification liquid is 100-600%;
The denitrification liquid of e, step d) enters membrane bioreactor (4) to carry out nitration reaction 2-5 hour, and ammonia nitrogen is converted into nitric nitrogen, and the nitrification liquid that obtains turns back to anoxic pond (3) then; Membrane bioreactor (4) carries out carburizing reagent simultaneously and removes organism, and the assimilation dephosphorization; Coagulating agent add-on system (7) is added to another part of coagulating agent in the membrane bioreactor (4), removes remaining hardly degraded organic substance and the phosphorus that exceeds the microorganism psychological need, and the coagulating agent addition is that coagulating agent is 5-30*10 with the weight ratio of disposing of sewage
-6: 1; Residual mud enters described sludge treating system (6);
F, the clear liquid after membrane bioreactor (4) separates are sent into ozone contact tank (5) and are decoloured with ozone and disinfect the water that obtains meeting the requirements.
2, method according to claim 1 is characterized in that pretreatment system (1) is made up of coarse rack, lift pump room, fine fack, settling pit and ultra-fine grid.
3, method according to claim 1 is characterized in that described coagulating agent add-on system (7) is connected to form through volume pump and line mixer (7-2) by the coagulating agent system (7-1) of batching.
4, method according to claim 1 is characterized in that described coagulating agent is one or more coagulating agent that are selected from HPACS-215 type, PAC-1 type and PAC-5 type coagulating agent, polymerize aluminum chloride, compound coagulant, water purification agent.
5, method according to claim 1 is characterized in that described carbon source add-on system (8) is connected to form through peristaltic pump and line mixer (8-2) by the carbon source system (8-1) of batching.
6, method according to claim 1 is characterized in that described carbon source is one or more carbon sources that are selected from methyl alcohol, ethanol, glucose, starch.
7, method according to claim 1, it is characterized in that described membrane bioreactor 4 is Aerobic Ponds, form by being immersed in film group device in the mixed solution (4-1), gas blower (4-2), suction pump (4-3), online soup cleanser (4-4), membrane bioreactor Controlling System (4-5), reflux pump (4-6).
8, method according to claim 1 is characterized in that described online soup cleanser (4-4) is made up of drug storage groove and dosing pump.
9, method according to claim 1 is characterized in that the ozone addition is that the ozone amount of every cubic metre of described clear liquid is 1-5mg, and the residence time of described clear liquid in ozone contact tank (5) is 5-20 minute.
10, method according to claim 1 is characterized in that micro-polluted water is polluted but by still spendable former water after handling.
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| CN101863599A (en) * | 2010-07-09 | 2010-10-20 | 天津创业环保集团股份有限公司 | Sludge water treatment system and treatment method thereof |
| WO2012040943A1 (en) * | 2010-09-29 | 2012-04-05 | 中国科学院沈阳应用生态研究所 | Method and apparatus for synchronously removing heavy metal and nitrate in drinking water |
| CN102616999A (en) * | 2012-04-11 | 2012-08-01 | 江苏韦帕环境工程有限公司 | Sewage purifying and recycling device |
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| CN105417895A (en) * | 2016-01-09 | 2016-03-23 | 王丽莉 | Membrane method and super magnetic coagulation combined water treatment technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101863599A (en) * | 2010-07-09 | 2010-10-20 | 天津创业环保集团股份有限公司 | Sludge water treatment system and treatment method thereof |
| WO2012040943A1 (en) * | 2010-09-29 | 2012-04-05 | 中国科学院沈阳应用生态研究所 | Method and apparatus for synchronously removing heavy metal and nitrate in drinking water |
| CN102616999A (en) * | 2012-04-11 | 2012-08-01 | 江苏韦帕环境工程有限公司 | Sewage purifying and recycling device |
| EP2711343B1 (en) * | 2012-09-22 | 2019-04-10 | Biottta Llc | Biological two-stage contaminated water treatment system |
| CN103172205A (en) * | 2013-04-16 | 2013-06-26 | 上海市城市建设设计研究总院 | Underground type integrated sewage pretreatment reaction tank |
| CN104628228A (en) * | 2015-02-03 | 2015-05-20 | 新疆德安环保工程有限公司 | Modular sewage treatment and reclamation method and device |
| CN105417895A (en) * | 2016-01-09 | 2016-03-23 | 王丽莉 | Membrane method and super magnetic coagulation combined water treatment technology |
| CN106938876A (en) * | 2017-05-09 | 2017-07-11 | 北京市环境保护科学研究院 | The preprocess method of waste water cleans in a kind of mineral water manufacturing enterprise |
| CN110171906A (en) * | 2019-06-13 | 2019-08-27 | 江西挺进环保科技有限公司 | A kind of basin-wide Rare-earth Mine tail water treatment system and treatment process |
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