CN103641272B - High concentrated organic wastewater and percolate zero-discharge treatment system - Google Patents
High concentrated organic wastewater and percolate zero-discharge treatment system Download PDFInfo
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Abstract
The invention discloses high concentrated organic wastewater and percolate zero-discharge treatment system, belong to sewage treatment area, its primary structure is by preprocessing system, anaerobic system, nitration denitrification system, tubular type ultrafiltration MBR system, nanofiltration system, the formations such as gas-liquid contact type vapo(u)rization system, wherein preprocessing system is connected by pipeline with anaerobic system, anaerobism circulatory pool in anaerobic system and the denitrification pond in nitration denitrification system are fixed side by side and are connected, nitration denitrification system is connected by pipeline with tubular type ultrafiltration MBR system, tubular type ultrafiltration MBR system is connected by pipeline with nanofiltration system, nanofiltration system is connected by pipeline with gas-liquid contact type vapo(u)rization system, tubular type ultrafiltration MBR system is connected by pipeline with excess sludge treatment system, treatment process of the present invention is simple, and volumetric loading strengthens greatly, and install, debug simply, the treatment time shortens, and energy consumption is low, and two pollutants after process reach grade III Standard, realize the zero-emission of pollution substance.
Description
Technical field
The present invention relates to a kind for the treatment of system for waste water, rubbish, belong to environmental protection industry (epi) sewage treatment area, be specifically related to a kind of high concentrated organic wastewater and percolate zero-discharge treatment system.
Technical background
Over nearly 10 years, China's industrialization and urbanization progress faster.Municipal wastes total amount with annual more than 10% speed increment, within 2010, China's domestic waste reaches more than 200,000,000 ton.Percolate is a kind of high density, polycomponent, the labile sewage that produce in garbage processing procedure, and 1 ton of percolate is about equivalent to the concentration of pollutent contained by 300 tons of municipal effluents.
Percolated liquid in city refuse landfill complicated component, be one of universally acknowledged the most unmanageable high concentrated organic wastewater, main manifestations be that BOD5, CODcr concentration is high, the content of ammonia nitrogen is higher, water quality and quantity mobility scale is quite large, microbial nutrition element ratio imbalance etc.Percolate is the secondary pollution source in landfill process, if do not add process and directly enter environment, can cause serious environmental pollution.In recent years, percolate causes severe contamination to the underground water in rubbish place, soil and surface water.The control of percolate from garbage filling field and process are the key factors of long-term, the safe disposal ensureing solid waste.
At present, Landfill Leachate process is China's landfill yard Construction and management comparatively one of weak link, country has formulated again percolate new standard GB16889-2008, percolate site disposal qualified discharge, then require more complicated treatment process, higher level of management and higher cost.But so far, be applicable to China's national situation, meet the percolate treating process of " efficient, low consumption " cleanup standard and be still in development.Therefore, inquire into the construction of reasonableness to modernization, standardized garbage sanitary filling field and economy, high-efficiency refuse percolate process engineering of garbage leachate treatment process, implement significant.
In recent years, along with the development of new separation technology, membrane separation technique obtains Preliminary Applications in landfill leachate treatment, convenient operation and management, do not arrange second pond, water outlet can reach reuse standard, and the gas-liquid contact type vapo(u)rization system or the technique that achieve pollution are worth promoting.But although the existing organic membrane cost be applied to is low and filling area is high, be easy in use procedure to occur withstand voltage, scale resistance is all bad, and vulnerable to pollution, regenerate more difficult, the life-span of film is general shorter, effluent quality instability etc.
Summary of the invention
In order to solve deficiency of the prior art, the invention provides a kind of high concentrated organic wastewater and percolate zero-discharge treatment system, treatment process is simple, volumetric loading strengthens greatly, install, debug simply, treatment time shortens, and reduce energy consumption, decrease occupation of land, two pollutants after process reach grade III Standard, realize the zero-emission of pollution substance, secondary pollution can not be caused to environment.
The present invention is achieved by the following technical solutions:
High concentrated organic wastewater and percolate zero-discharge treatment system, its primary structure is by preprocessing system, anaerobic system, nitration denitrification system, tubular type ultrafiltration MBR system, nanofiltration system, gas-liquid contact type vapo(u)rization system, excess sludge treatment system, accident pool is formed, wherein preprocessing system is connected by pipeline with anaerobic system, anaerobism circulatory pool in anaerobic system and the denitrification pond in nitration denitrification system are fixed side by side and are connected, nitration denitrification system is connected by pipeline with tubular type ultrafiltration MBR system, tubular type ultrafiltration MBR system is connected by pipeline with nanofiltration system, nanofiltration system is connected by pipeline with gas-liquid contact type vapo(u)rization system, tubular type ultrafiltration MBR system is connected by pipeline with excess sludge treatment system, accident pool is connected with the basket filter in preprocessing system by waste pipe.
Described preprocessing system, its structure comprises: basket filter, settling pit, equalizing tank, wherein basket filter is connected by pipeline with settling pit, settling pit and equalizing tank are fixed side by side and are connected, basket filter, can elimination large granular impurity, settling pit, further precipitated impurities, the equalizing tank regulating water quality water yield and and acidification hydrolization.
Described system for anaerobic treatment, its structure by: anaerobism intake pump, EUASB anaerobic reactor, anaerobism circulatory pool, anaerobism recycle pump are formed, wherein anaerobism intake pump is connected by pipeline with EUASB anaerobic reactor, EUASB anaerobic reactor and anaerobism circulatory pool are fixed side by side and are connected, anaerobism circulatory pool is connected by pipeline with anaerobism recycle pump, EUASB anaerobic reactor removes most of organism in Leachate site, and anaerobism circulatory pool can mixing anaerobic pond clear liquid regulate follow-up water inlet.
Described nitration denitrification system, its structure is by denitrification pond, nitrification tank, stirrer, aeration cycle pump, roots blower, jet aerator is formed, wherein stirrer is fixedly installed in denitrification pond, denitrification pond and nitrification tank are fixed side by side and are connected, nitrification tank is connected by pipeline with aeration cycle pump, aeration cycle pump is connected by pipeline with jet aerator, jet aerator is fixedly installed in nitrification tank, roots blower is connected by pipeline with jet aerator, the denitrification in denitrification pond is utilized to remove nitric nitrogen, and then utilize nitrification tank nitrification by mineralized nitrogen for nitric nitrogen and significantly organics removal, ultrafiltration MBR system, plays the effect of Separation of Water and mud on the one hand, on the other hand, plays the function of reservation and enhancement microbiological system.
Described tubular type ultrafiltration MBR system, its structure by: ultrafiltration intake pump, ultrafiltration MBR film group, ultrafiltration recycle pump, ultrafiltration scavenging pump, cleaning barrels are formed, wherein ultrafiltration intake pump is connected by pipeline with ultrafiltration recycle pump, ultrafiltration recycle pump is connected by pipeline with ultrafiltration MBR film group, ultrafiltration scavenging pump is connected by pipeline with ultrafiltration recycle pump, cleaning barrels is connected by pipeline with ultrafiltration scavenging pump, and ultrafiltration membrane system adopts 8 cun of 3m external PVDF ultrafiltration MBR film groups.
Described nanofiltration system, its structure by: the former bucket of nanofiltration, nanofiltration intake pump, nanofiltration high-pressure pump, nanofiltration membrane group, cleaning barrels, nanofiltration scavenging pump, nanofiltration dope storage tank are formed, wherein the former bucket of nanofiltration is connected by pipeline with nanofiltration intake pump, nanofiltration intake pump is connected by pipeline with nanofiltration high-pressure pump, cleaning barrels is connected by pipeline with nanofiltration scavenging pump, nanofiltration scavenging pump is connected by pipeline with nanofiltration high-pressure pump, nanofiltration high-pressure pump is connected by pipeline with nanofiltration membrane group, and nanofiltration membrane group is connected by pipeline with nanofiltration dope storage tank.Nanofiltration membrane treatment system plays the effect of the impurity that dams by nanofiltration membrane component.
Described gas-liquid contact type vapo(u)rization system, its structure by: vapo(u)rization system intake pump, gas-liquid contact type evaporation unit are formed, wherein nanofiltration dope storage tank is connected by pipeline with vapo(u)rization system intake pump, vapo(u)rization system intake pump is connected by pipeline with gas-liquid contact type evaporation unit, and gas-liquid contact type vapo(u)rization system realizes solid-liquid separation by low-temperature evaporation thus reaches the object of pollution substance zero release.
Described excess sludge treatment system, its structure by: sludge thickener, dewatering centrifuge, medicine-adding bin, dosing pump, sludge pump are formed, wherein sludge thickener is connected by pipeline with sludge pump, sludge pump is connected by pipeline with dewatering centrifuge, medicine-adding bin is connected by pipeline with dosing pump, and dosing pump is connected by pipeline with dewatering centrifuge.
The workflow of high concentrated organic wastewater of the present invention and percolate zero-discharge treatment system is as follows:
Leachate site enters settling pit and precipitates further after basket filter elimination macrobead thing impurity, enters the equalizing tank regulating water quality water yield afterwards and pre-acidified hydrolysis, for subsequent disposal operation reduces pollutant load;
Sewage in equalizing tank is promoted in EUASB anaerobic reactor through anaerobism intake pump, by the organic substance in the metabolism Decomposition Wastewater of anaerobion in EUASB anaerobic reactor, make deliquescent organic substance through a series of biological process, remove most of organism in Leachate site, reduce COD, in Leachate site, majority of organic pollutants is removed, reduction is to a certain extent obtained at this stage COD, the mode that anaerobism circulation adopts reaction zone circulation and effluent recycling to combine, for avoiding causing secondary pollution, the biogas produced is collected and sends into power plant's garbage warehouse,
Anaerobism circulatory pool water outlet gravity flow enters anoxic/aerobic membrane bioreactor, reactor takes the form of Prepositive denitrification, in nitration denitrification system, due to stirrer in denitrification pond, the water outlet of anaerobism circulatory pool is made fully to mix with nitration section phegma after stirring action, under low dissolved axygen state, remove nitric nitrogen through denitrification, then enter nitrification tank; In nitrification tank, the jet-flow aeration of jet aerator makes mixed solution in pond be high-solubility oxygen state, and through sufficient nitration reaction, in water, mineralized nitrogen is nitric nitrogen, and the substrate concentration of organic contamination simultaneously significantly reduces; The mixed solution of nitrification tank enters external pipe type ultrafiltration MBR system, large discharge ultrafiltration recycle pump is established in system, circulate in film surface by large discharge and form high velocity turbulent flow, make pollutent not easily in film surface attachment, form transmembrane pressure by recycle pump simultaneously, water component in muddy water mixed solution forms permeate through film and discharges, permeate or qualified discharge or enter next processing unit continue process, mixed solution after concentrated is still back to denitrification pond and digester increases sludge concentration, and excess sludge drains into sludge thickener;
Ultrafiltration is produced water and is entered nanofiltration membrane system through nanofiltration intake pump and the pressurization of nanofiltration high-pressure pump, and utilize nanofiltration membrane component to the crown_interception of solute, every contamination index is reduced, nanofiltration dope is then realized the zero release of pollution substance by the process of gas-liquid contact type vapo(u)rization system;
The excess sludge that biochemical system produces enters sludge thickener and carries out concentration, and the residue that the mud after concentrated and gas-liquid contact type vapo(u)rization system produce is promoted to dewatering centrifuge centrifuge dehydration by sludge pump, and the backflow of desliming clear liquid enters biochemical system and continues process; Because organism contained in mud is effective bioenergy, dry mud can produce the heat of 16.65-20.93MJ/t, for a kind of low calorie fuels, mud water ratio after concentration is about 80%, become mud cake shape, every day is about 0.6t, and dehydrated sludge can not cause secondary pollution to environment in course of conveying, can be transported to incinerator and domestic garbage mixing burning disposal.
Owing to have employed above technical scheme, the present invention, compared with traditional product, has following advantage and advantage:
1) realize HRT with SRT to be separated: anaerobic and aerobic are follow-up arranges tubular type MBR me.mbrane bioreactor, the process employs the biochemical mode combined with ultra-filtration membrane, ultra-filtration membrane instead of traditional second pond, achieve being separated completely of water in active sludge and microbial cells, both achieved being separated completely of the water conservancy residence time (HRT) and sludge retention time (SRT), consequent highly active aerobic microbiological group has high degradation efficiency to the high loading organic pollutant in Leachate site.
2) retain and domesticated organism flora easy: microorganism species is trapped in membrane bioreactor is completely conducive to reservation generation cycle longer microorganism, domestication produces microorganism species hardly degraded organic substance to stronger degradation capability, also can effectively degrade to the organism of bio-refractory in Leachate site, ensure that good effluent quality, and water conditioning.
3) biological denitrificaion efficiency is high: make the nitrogen-containing pollutant in sewage be converted into the process of nitrogen by the combined action of nitrobacteria and denitrifying bacterium.Aerobic/anaerobic-MBR me.mbrane bioreactor technique adopts biological denitrificaion mode and nitrification and denitrification effectively remove ammonia nitrogen and total nitrogen and degrade, and ammonia nitrogen removal effect can reach 99%, reaches 75-90% to total nitrogen; Only reach 80-90% than the biological denitrification process efficiency of traditional employing nitrification and denitrification, total nitrogen only reaches 50-60%.And a large amount of engineering practices proves its great superiority.
4) enriched microorganism: enrichment fast-growing type flora-nitrite bacteria promote its growth and damming of mechanical membrane that MBR membrane bioreactor is exactly targetedly, enables small and nitrite bacteria that is that grow fast effectively retains.Not only improve and improve activated sludge concentration on the surface, the more important thing is in deposition activity mud the microorganism most with active and vitality; Build and be conducive to breeding microorganism slowly, as the environment that nitrous acid and nitrobacteria grow, the nitrification ability of system can have been improved, be conducive to the processing efficiency of raising difficult degradation larger molecular organics simultaneously and impel it to decompose thoroughly; Retain and enhancement microbiological---as microorganism device, retain high efficiency engineering microorganism, the catagen speed of high-efficiency strain can be greatly reduced.
5) EUASB efficiency is high and adjustable: the sludge quantity of high density in reactor, adopts the systemic circulation mode before triphase separator, can avoid sludge loss in reactor.In the circular flow mode before triphase separator, be conducive to reactor from inoculation ability, shorten start time, be conducive to ensureing the high concentration sludge amount in reactor and activity, the separation function of triphase separator can not be affected because of the change of flow velocity in reactor.Process particularly for the higher organic waste water of concentration should consider that internal recycle is to improve upflow velocity in reactor.From top, pond water distribution: anaerobism pipeline very easily fouling after long-time running, therefore water distributor is from the mode of Chi Ding employing branch water distribution, has sleeve pipe, maintain easily replacing outside water distributor.
6) jet-flow aeration high-level efficiency: the mud mixture in aeration tank under relatively low pressure, is sent in the inner nozzle of jet aerator by circulating water main by water circulating pump, forms the liquid stream of one high speed, and air is admitted in outer nozzle simultaneously.Air cuts by liquid stream at a high speed, is atomized into the bubble that diameter is extremely small, forms turbulent flow, gas-liquid mixed stream chopped.Transfer to liquid phase and biophase quickly and effectively, complete the rush transfer process of oxygen.Dissolved oxygen efficiency can reach 28.0 ~ 32.0%.
7) efficient low working cost denitrification A pond: denitrification removes oxynitride and organic carbon, by controlling the COD load of anaerobic pond, guarantees to enter in the waste water of anoxic pond utilizing for denitrification containing enough carbon sources.Without the need to additional carbon, reclaim the basicity that denitrification produces, reduce the working cost of engineering.HRT:43-60h；MLSS：15~20g/L。
8) efficient denitrification decarburization O pond: adopt underload decarburization, nitrated Aerobic Pond, remove most ammonia-nitrogen by nitrification, removes most organic pollutant in water body by aerobic microbiological.HRT:170h；MLSS：15~20g/L。
9) less energy-consumption ultrafiltration type MBR: solid-liquid separation and retain flora.Mixed liquid recycle ratio: 600% ~ 1200%; Return sludge ratio: 80% ~ 100%; Membrane flux: 70-80L/m2h(flat sheet membrane 20-20L/m2h).
10) sludge concentration is high: sludge concentration height is one of maximum advantage of MBR, and Traditional Method is subject to the impact of sedimentation cannot too high (<5g).Tubular fibre immersion is subject to the stifled problem of fracture of wire and dirt can not too high (<8g).And tubular type MBR can be normally 15g up to MBR, 25g can be arrived, even 40g.
11) sludge settling and expansion issues is solved: the problem that conventional process is had a headache most is the problem of sedimentation and expansion.The biochemical muddy water mixed solution of tubular type MBR directly enters 8mm film pipe, is separated by clear water, need not precipitates with mud.
12) problem that film silk is easily stifled, disconnected is overcome: the problem that immersion MBR has a headache most is the problem of fracture of wire, and tubular membrane has very solid supporting layer, substantially can not break.Dirty stifled is the common problem of embrane method sewage disposal.And tubular membrane passage large (8mm is even larger), surface velocity high (4m/s), pollutes little, and dirty stifled probability is little.And the PVDF reinforcing line counterdie of special type and high flow rate, greatly overcome fracture of wire, dirty stifled and flux decline problem.
13) cleaning and the problem of flux recovery: embrane method sewage disposal, cleaning is inevitable, cleaning trouble, complicated, and cleaning performance is bad, the rear flux recovery of cleaning is not good is the problem of having a headache most.Tubular type MBR film only need be shut down clear water and be rinsed (2-5 minute), and regular matting (1-6 month once), on-line operation is easy, and cleaning recovery effects is good.Tubular membrane is due to rete very thin (about 30um), and therefore resistance is little, operating flux 65-140LMH.Be high high-throughput in sewage disposal, and flux easily recover to reach to 100%.
14) mud water ratio after concentration is about 80%, and become mud cake shape, every day is about 0.6t.Dehydrated sludge can not cause secondary pollution to environment in course of conveying, can be transported to incinerator and domestic garbage mixing burning disposal.
15) process of gas-liquid contact type vapo(u)rization system realizes the zero release of pollution substance, the sheet flow that liquid runs down tilts, and owing to producing small negative pressure below cavatition flat board, tang appears in dull and stereotyped upper surface; Negative pressure makes air enter flowing fluid from dull and stereotyped below, when becoming saturated steam after long bubble and liquid Long contact time, exchanges solute or heat in other liquid; Fan with low voltage is carried air and is strengthened the contact of gas-liquid, improves reaction efficiency.Whole process can use useless dust and useless remaining steam to provide gas-liquid contact type vapo(u)rization system power loss as energy.
16) volumetric loading greatly strengthens, installs, debugs simply, and the treatment time shortens, and reduce energy consumption, decrease occupation of land, two pollutants after process reach firsts and seconds relevant national standard.
Accompanying drawing explanation
Fig. 1, be structural representation of the present invention.
Fig. 2, be workflow diagram of the present invention.
In Fig. 1: 1-preprocessing system, 2-anaerobic system, 3-nitration denitrification system, 4-tubular type ultrafiltration MBR system, 5-nanofiltration system, 6-gas-liquid contact type vapo(u)rization system, 7-excess sludge treatment system, 8-accident pool, 11-basket filter, 12-settling pit, 13-equalizing tank, 21-anaerobism intake pump, 22-EUASB anaerobic reactor, 23-anaerobism circulatory pool, 24-anaerobism recycle pump, 31-denitrification pond, 32-nitrification tank, 33-stirrer, 34-aeration cycle pump, 35-roots blower, 36-jet aerator, 41-ultrafiltration intake pump, 42-ultrafiltration MBR film group, 43-ultrafiltration recycle pump, 44-ultrafiltration scavenging pump, 45-cleaning barrels, the former bucket of 51-nanofiltration, 52-nanofiltration intake pump, 53-nanofiltration high-pressure pump, 54-nanofiltration membrane group, 55-cleaning barrels, 56-nanofiltration scavenging pump, 57-nanofiltration dope storage tank, 61-vapo(u)rization system intake pump, 62-gas-liquid contact type evaporation unit, 71-sludge thickener, 72-dewatering centrifuge, 73-medicine-adding bin, 74-dosing pump, 75-sludge pump.
embodiment
As shown in Figure 1, high concentrated organic wastewater and percolate zero-discharge treatment system, its primary structure is by preprocessing system, anaerobic system, nitration denitrification system, tubular type ultrafiltration MBR system, nanofiltration system, gas-liquid contact type vapo(u)rization system, excess sludge treatment system, accident pool is formed, wherein preprocessing system is connected by pipeline with anaerobic system, anaerobism circulatory pool in anaerobic system and the denitrification pond in nitration denitrification system are fixed side by side and are connected, nitration denitrification system is connected by pipeline with tubular type ultrafiltration MBR system, tubular type ultrafiltration MBR system is connected by pipeline with nanofiltration system, nanofiltration system is connected by pipeline with gas-liquid contact type vapo(u)rization system, tubular type ultrafiltration MBR system is connected by pipeline with excess sludge treatment system, accident pool is connected with the basket filter in preprocessing system by waste pipe.
Described preprocessing system, its structure comprises: basket filter, settling pit, equalizing tank, wherein basket filter is connected by pipeline with settling pit, settling pit and equalizing tank are fixed side by side and are connected, basket filter, can elimination large granular impurity, settling pit, further precipitated impurities, the equalizing tank regulating water quality water yield and and acidification hydrolization.
Described system for anaerobic treatment, its structure by: anaerobism intake pump, EUASB anaerobic reactor, anaerobism circulatory pool, anaerobism recycle pump are formed, wherein anaerobism intake pump is connected by pipeline with EUASB anaerobic reactor, EUASB anaerobic reactor and anaerobism circulatory pool are fixed side by side and are connected, anaerobism circulatory pool is connected by pipeline with anaerobism recycle pump, EUASB anaerobic reactor removes most of organism in Leachate site, and anaerobism circulatory pool can mixing anaerobic pond clear liquid regulate follow-up water inlet.
Described nitration denitrification system, its structure is by denitrification pond, nitrification tank, stirrer, aeration cycle pump, roots blower, jet aerator is formed, wherein stirrer is fixedly installed in denitrification pond, denitrification pond and nitrification tank are fixed side by side and are connected, nitrification tank is connected by pipeline with aeration cycle pump, aeration cycle pump is connected by pipeline with jet aerator, jet aerator is fixedly installed in nitrification tank, roots blower is connected by pipeline with jet aerator, the denitrification in denitrification pond is utilized to remove nitric nitrogen, and then utilize nitrification tank nitrification by mineralized nitrogen for nitric nitrogen and significantly organics removal, ultrafiltration MBR system, plays the effect of Separation of Water and impurity.
Described tubular type ultrafiltration MBR system, its structure by: ultrafiltration intake pump, ultrafiltration MBR film group, ultrafiltration recycle pump, ultrafiltration scavenging pump, cleaning barrels are formed, wherein ultrafiltration intake pump is connected by pipeline with ultrafiltration recycle pump, ultrafiltration recycle pump is connected by pipeline with ultrafiltration MBR film group, ultrafiltration scavenging pump is connected by pipeline with ultrafiltration recycle pump, cleaning barrels is connected by pipeline with ultrafiltration scavenging pump, and ultrafiltration membrane system adopts 8 cun of 3m external PVDF ultrafiltration MBR film groups.
Described nanofiltration system, its structure is by nanofiltration former bucket, nanofiltration intake pump, nanofiltration high-pressure pump, nanofiltration membrane group, cleaning barrels, nanofiltration scavenging pump, nanofiltration dope storage tank is formed, wherein the former bucket of nanofiltration is connected by pipeline with nanofiltration intake pump, nanofiltration intake pump is connected by pipeline with nanofiltration high-pressure pump, cleaning barrels is connected by pipeline with nanofiltration scavenging pump, nanofiltration scavenging pump is connected by pipeline with nanofiltration high-pressure pump, nanofiltration high-pressure pump is connected by pipeline with nanofiltration membrane group, nanofiltration membrane group is connected by pipeline with nanofiltration dope storage tank, nanofiltration membrane treatment system plays the effect of the impurity that dams by nanofiltration membrane component.
Described gas-liquid contact type vapo(u)rization system, its structure by: vapo(u)rization system intake pump, gas-liquid contact type evaporation unit are formed, wherein nanofiltration dope storage tank is connected by pipeline with vapo(u)rization system intake pump, vapo(u)rization system intake pump is connected by pipeline with gas-liquid contact type evaporation unit, and gas-liquid contact type vapo(u)rization system realizes solid-liquid separation by low-temperature evaporation thus reaches the object of pollution substance zero release.
Described excess sludge treatment system, its structure by: sludge thickener, dewatering centrifuge, medicine-adding bin, dosing pump, sludge pump are formed, wherein sludge thickener is connected by pipeline with sludge pump, sludge pump is connected by pipeline with dewatering centrifuge, medicine-adding bin is connected by pipeline with dosing pump, and dosing pump is connected by pipeline with dewatering centrifuge.
As shown in Figure 1, 2, the workflow of high concentrated organic wastewater of the present invention and percolate zero-discharge treatment system is as follows:
Leachate site enters settling pit and precipitates further after the basket filter elimination macrobead thing impurity in preprocessing system, enters the equalizing tank regulating water quality water yield afterwards and pre-acidified hydrolysis, for subsequent disposal operation reduces pollutant load;
Equalizing tank sewage is promoted in EUASB anaerobic reactor through anaerobism intake pump, interior by the organic substance in the metabolism Decomposition Wastewater of anaerobion, make deliquescent organic substance through a series of biological process, remove most of organism in Leachate site, reduce COD, in Leachate site, majority of organic pollutants is removed, reduction is to a certain extent obtained at this stage COD, the mode that anaerobism circulation adopts reaction zone circulation and effluent recycling to combine, for avoiding causing secondary pollution, the biogas of generation is collected and sends into power plant's garbage warehouse;
Anaerobism circulatory pool water outlet gravity flow enters nitration denitrification and tubular type ultrafiltration MBR system, take the form of Prepositive denitrification, in nitration denitrification system, because stirrer stirring action in denitrification pond makes the water outlet of anaerobism circulatory pool fully mix with nitration section phegma, under low dissolved axygen state, remove nitric nitrogen through denitrification, then enter nitrification tank, in nitration reaction section, under high-solubility oxygen state, through sufficient nitration reaction, in water, mineralized nitrogen is nitric nitrogen, the substrate concentration of organic contamination simultaneously significantly reduces, the mixed solution of nitration section enters external pipe type ultrafiltration MBR system, large discharge ultrafiltration recycle pump is established in tubular type ultrafiltration MBR system, circulate in film surface by large discharge and form high velocity turbulent flow, make pollutent not easily in film surface attachment, form transmembrane pressure by recycle pump simultaneously, water component in muddy water mixed solution forms permeate through film and discharges, permeate or qualified discharge or enter next processing unit continue process, mixed solution after concentrated is still back to denitrification denilrification system increases sludge concentration, excess sludge drains into sludge thickener.
Ultrafiltration is produced water and is entered nanofiltration membrane treatment system through nanofiltration intake pump and the pressurization of nanofiltration high-pressure pump, utilizes nanofiltration membrane component to the crown_interception of solute, every contamination index is reduced; Nanofiltration dope is then realized the zero release of pollution substance by the process of gas-liquid contact type vapo(u)rization system.
The excess sludge that biochemical system produces enters sludge thickener and carries out concentration, and the residue that the mud after concentrated and gas-liquid contact type vapo(u)rization system produce is promoted to dewatering centrifuge centrifuge dehydration by sludge pump, and the backflow of desliming clear liquid enters biochemical system and continues process.Because organism contained in mud is effective bioenergy, dry mud can produce the heat of 16.65-20.93MJ/t, is a kind of low calorie fuels.This mud water ratio after concentration is about 80%, and become mud cake shape, every day is about 0.6t, and dehydrated sludge can not cause secondary pollution to environment in course of conveying, can be transported to incinerator and domestic garbage mixing burning disposal.
Two pollutants reach " integrated wastewater discharge standard " (GB8978-1996) grade III Standard, and specific targets see the following form:
Water outlet Pollutant emission concentration limit value
In table: UF is the process of tubular type ultrafiltration MBR system, and NF is nanofiltration system process.
Claims (4)
1. high concentrated organic wastewater and percolate zero-discharge treatment system, its primary structure is by preprocessing system, anaerobic system, nitration denitrification system, tubular type ultrafiltration MBR system, nanofiltration system, gas-liquid contact type vapo(u)rization system, excess sludge treatment system, accident pool is formed, it is characterized in that: wherein preprocessing system is connected by pipeline with anaerobic system, anaerobism circulatory pool in anaerobic system and the denitrification pond in nitration denitrification system are fixed side by side and are connected, nitration denitrification system is connected by pipeline with tubular type ultrafiltration MBR system, tubular type ultrafiltration MBR system is connected by pipeline with nanofiltration system, nanofiltration system is connected by pipeline with gas-liquid contact type vapo(u)rization system, tubular type ultrafiltration MBR system is connected by pipeline with excess sludge treatment system, accident pool is connected with the basket filter in preprocessing system by waste pipe,
Described preprocessing system, its structure comprises: basket filter, settling pit, equalizing tank, wherein basket filter is connected by pipeline with settling pit, settling pit and equalizing tank are fixed side by side and are connected, basket filter, can elimination large granular impurity, settling pit, further precipitated impurities, the equalizing tank regulating water quality water yield and and acidification hydrolization;
Described system for anaerobic treatment, its structure by: anaerobism intake pump, EUASB anaerobic reactor, anaerobism circulatory pool, anaerobism recycle pump are formed, wherein anaerobism intake pump is connected by pipeline with EUASB anaerobic reactor, EUASB anaerobic reactor and anaerobism circulatory pool are fixed side by side and are connected, anaerobism circulatory pool is connected by pipeline with anaerobism recycle pump, EUASB anaerobic reactor removes most of organism in Leachate site, and anaerobism circulatory pool can mixing anaerobic pond clear liquid regulate follow-up water inlet.
2. high concentrated organic wastewater as claimed in claim 1 and percolate zero-discharge treatment system, it is characterized in that: described nitration denitrification system, its structure is by denitrification pond, nitrification tank, stirrer, aeration cycle pump, roots blower, jet aerator is formed, wherein stirrer is fixedly installed in denitrification pond, denitrification pond and nitrification tank are fixed side by side and are connected, nitrification tank is connected by pipeline with aeration cycle pump, aeration cycle pump is connected by pipeline with jet aerator, jet aerator is fixedly installed in nitrification tank, roots blower is connected by pipeline with jet aerator, the denitrification in denitrification pond is utilized to remove nitric nitrogen, and then utilize nitrification tank nitrification by mineralized nitrogen for nitric nitrogen and significantly organics removal, ultrafiltration MBR system, plays the effect of Separation of Water and mud on the one hand, on the other hand, plays the function of reservation and enhancement microbiological system.
3. high concentrated organic wastewater as claimed in claim 1 and percolate zero-discharge treatment system, it is characterized in that: described tubular type ultrafiltration MBR system, its structure by: ultrafiltration intake pump, ultrafiltration MBR film group, ultrafiltration recycle pump, ultrafiltration scavenging pump, cleaning barrels are formed, wherein ultrafiltration intake pump is connected by pipeline with ultrafiltration recycle pump, ultrafiltration recycle pump is connected by pipeline with ultra-filtration membrane group, ultrafiltration scavenging pump is connected by pipeline with ultrafiltration recycle pump, cleaning barrels is connected by pipeline with ultrafiltration scavenging pump, and ultrafiltration membrane system adopts 8 cun of 3m external PVDF ultrafiltration MBR film groups;
Described nanofiltration system, its structure by: the former bucket of nanofiltration, nanofiltration intake pump, nanofiltration high-pressure pump, nanofiltration membrane group, cleaning barrels, nanofiltration scavenging pump, nanofiltration dope storage tank are formed, wherein the former bucket of nanofiltration is connected by pipeline with nanofiltration intake pump, nanofiltration intake pump is connected by pipeline with nanofiltration high-pressure pump, cleaning barrels is connected by pipeline with nanofiltration scavenging pump, nanofiltration scavenging pump is connected by pipeline with nanofiltration high-pressure pump, nanofiltration high-pressure pump is connected by pipeline with nanofiltration membrane group, and nanofiltration membrane group is connected by pipeline with nanofiltration dope storage tank;
Described excess sludge treatment system, its structure by: sludge thickener, dewatering centrifuge, medicine-adding bin, dosing pump, sludge pump are formed, wherein sludge thickener is connected by pipeline with sludge pump, sludge pump is connected by pipeline with dewatering centrifuge, medicine-adding bin is connected by pipeline with dosing pump, and dosing pump is connected by pipeline with dewatering centrifuge.
4. high concentrated organic wastewater as claimed in claim 1 and percolate zero-discharge treatment system, it is characterized in that: described gas-liquid contact type vapo(u)rization system, its structure by: vapo(u)rization system intake pump, gas-liquid contact type evaporation unit are formed, wherein nanofiltration dope storage tank is connected by pipeline with vapo(u)rization system intake pump, vapo(u)rization system intake pump is connected by pipeline with gas-liquid contact type evaporation unit, and gas-liquid contact type vapo(u)rization system realizes solid-liquid separation by low-temperature evaporation thus reaches the object of pollution substance zero release.
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