CN102276106A - Livestock and poultry manure wastewater processing method - Google Patents
Livestock and poultry manure wastewater processing method Download PDFInfo
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- CN102276106A CN102276106A CN 201110129177 CN201110129177A CN102276106A CN 102276106 A CN102276106 A CN 102276106A CN 201110129177 CN201110129177 CN 201110129177 CN 201110129177 A CN201110129177 A CN 201110129177A CN 102276106 A CN102276106 A CN 102276106A
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Abstract
The invention discloses a livestock and poultry manure wastewater processing method. The method is characterized in that: a methane production process and a denitrification treatment are simultaneously carried out by using a CSTR reactor; and a nitration and denitrification treatment is carried out by using an MSBR reaction tank. According to the invention, the methane production process and the denitrification treatment are integrated into a whole. With the short-range nitration and denitrification treatment of the MSBR, wastewater COD, nitrite and ammonia nitrogen can be removed simultaneously. Further, with the method, 40% of carbon source, 25% of oxygen demand and 300% of sludge production can be saved.
Description
Technical field
The present invention relates to a kind of livestock and poultry liquid dung treatment technology, especially produce the removal that methane denitrification associating MSBR nitration denitrification technology realizes animal dung waste water COD, nitrite nitrogen, ammonia nitrogen based on CSTR.
Background technology
The numerous livestock and poultry farm of Three Gorge Reservoir Region in Chongqing is built secondary tributary bank in, and the livestock and poultry discharge is the unprocessed water body that directly enters mostly, and the livestock and poultry liquid manure has become one of primary pollution source of Three Gorges Reservoir, serious threat reservoir area of Three Gorges water environment safety.And along with the growth of economy, in the following long term, aquaculture will further develop, and its livestock and poultry liquid manure must cause more environment and seriously influence.At outstanding problems such as the littoral secondary river of livestock and poultry breeding industry severe contamination, secondary tributary, reservoir area of Three Gorges and economic and practical technology famine, management system are unsound, in conjunction with villages and small towns, reservoir area of Three Gorges society, economy and physical geography condition characteristics, be necessary experiment and demonstration by tackling problems in key technologies and technology, set up the high-performance bio treatment technology system of livestock and poultry cultivation waste, cutting down for the pollution control of livestock and poultry cultivation waste and pollution load provides economic and practical technology mode.And animal dung waste water has the characteristics of high ammonia nitrogen, high organic concentration, after adopting conventional sewage disposal mode to handle, still have that biodegradability is poor, C/N is than problems such as little, aerobic after-treatment system denitrifying carbon source deficiency, poor processing effect, therefore, the livestock and poultry liquid manure treatment technology of exploitation efficient economy, the minimizing pollutent has necessity and urgency to the pollution of environment.
Summary of the invention
At above-mentioned prior art deficiency, the present invention be to solve that existing animal dung wastewater processing technology exists that biodegradability is poor, C/N is than the problem of little, aerobic after-treatment system denitrifying carbon source deficiency, poor processing effect, and provides a kind of treatment effect good animal dung method of wastewater treatment.
The explanation of technical terms that relates among the application is as follows:
Animal dung waste water is meant because animal dung is piled up and the effusive waste water that is being mingled with a large amount of livestock and poultry liquid manures to have the characteristics of high ammonia nitrogen, high organic concentration.
CSTR (continuous stirred tank reactor) or CSTR reactor are a kind of continuous-stirring reactor systems.The principle of CSTR technology is the fermentation of finishing feed liquid in a closed tin body device, the process that methane produces.Stirring mechanism is installed in the device, makes fermentation raw material and microorganism be in complete admixture.Feeding mode adopts constant temperature continuous dosing or the semicontinuous operation that feeds intake.The raw material that newly enters makes fermentation substrate concentration remain relatively low state because stirring action whole fermented liquid bacterial classifications very fast and in the device mix.Belong to prior art.
MSBR(Modified Sequencing Batch Reactor Activated Sludge Process) be the abbreviation of modified form sequencing batch active sludge, the A2/O method combines with the SBR method and obtains, wherein the A2/O method is anaerobic-anoxic-aerobic method, it is biological denitrification phosphorous removal technique comparatively commonly used, the SBR method is a kind of active sludge sewage disposal technology that moves by the intermittent aeration mode, also belongs to existing technology.MSBR technology is implemented in the MSBR system, MSBR system (or MSBR reaction tank) comprises anaerobic pond, two anoxic pond, main aeration tank, SBR pond and mud-water separation ponds, the MSBR technical process is, sewage enters anaerobic pond, mix with the returned sluge of from first anoxic pond, returning, make the phosphorus in the returned sluge be able to abundant release with the dirt reflux pump; Mixed solution flows into second anoxic pond, is blended in denitrogenation under the denitrifying bacteria effect with the phegma of being squeezed into from main aeration tank by reflux pump again; Enter main aeration tank then, through aerobic treatment to sewage in organism degrade, carry out nitrification simultaneously; Flow into the SBR pond then, organism is finished precipitate and separate simultaneously in this further degraded in the sewage, and the upper strata clear water is discharged, and precipitating sludge partial periodicity ground is squeezed into the mud-water separation pond by sludge pump and further clarified, and excess sludge is discharged by the SBR pond; Supernatant liquor enters main aeration tank in the mud-water separation pond, and bottom mud enters first anoxic pond, further consumes dissolved oxygen wherein, for the abundant release of phosphorus in next step mud creates good conditions.Nitrogen is mainly removed in anoxic pond in the sewage, and carbon is mainly removed in main aeration tank and SBR pond, and phosphorus fully discharges in anaerobic pond by mud, poly-phosphorus in the SBR pond, and the circulation of mud makes the phosphorus enrichment, discharges with excess sludge, and sewage is purified.
COD, chemical oxygen demand (COD) is under certain conditions, when adopting strong oxidizer to handle water sample, the oxidant content that is consumed.Be used for representing what a index of water reducing substances.
DO, (dissolved oxygen) is meant the amount that is dissolved in oxygen in the water, with oxygen in every premium on currency the milligram numerical table show.
Vertical sedimentation basin claims vertical sedimentation basin again, is the vertical mobile settling tank of waste water in the pond.Pond body plane figure is circular or square, water enters in the pond (in the pipe flow velocity should less than 30mm/s) from top to bottom by the water inlet pipe that is located at the center, pond, pipe is divided into umbrella-shaped baffle slowly rises waste water along whole water-carrying section behind the uniform distribution in the pond, suspended substance sedimentation enters in the heavy bucket of pond base cone shape, and primary water goes out along the peripheral overflow weir flow all around from the pond.Baffled and scum silica frost groove guarantees effluent quality to hold back scum silica frost before the weir.The one side in pond is established shore pipe by pool wall and by hydrostaticpressure mud is regularly discharged.
The present invention has adopted following technical scheme:
A kind of animal dung method of wastewater treatment, its characteristics are, adopt the CSTR reactor to produce the methane denitrification simultaneously earlier and handle, and adopt the MSBR reaction tank to carry out nitration denitrification again and handle.
Specifically, present method adopts a CSTR reactor, a vertical sedimentation basin and a MSBR reaction tank to implement, wherein said CSTR reactor lower end is provided with the waste water import, the upper end is provided with wastewater outlet and is connected to vertical sedimentation basin, vertical sedimentation basin lower end mud discharging mouth adopts the waste water ingress of the pipe connection of band pump machine to CSTR reactor lower end, and the overflow weir outlet of vertical sedimentation basin upper end is connected to the MSBR reaction tank; When present method was implemented, the product methane denitrification mud that the inoculation of CSTR reactor has been tamed, animal dung waste water produced the operation of methane denitrification after entering the CSTR reactor simultaneously, and control COD influent load is lower than 4.0kgCODm
-3D
-1, control NO
2 -The N influent load is lower than 0.25kgm
-3D
-1PH in the control CSTR reactor is 7.5, temperature is 30～35 ℃, it is each the stirring 20 minutes that the CSTR reactor stirs rule, stirred once every 4 hours, stirring frequency 30 r/min, the CSTR reactor wastewater treatment residence time is 10 days, after CSTR reactor internal reaction finishes, waste water enters into the MSBR reaction tank through the vertical sedimentation basin post precipitation and handles, when the MSBR reaction tank is handled, adopt 2 SBR ponds to replace water outlet, the reaction times of controlling the SBR pond simultaneously is anoxia stirring 1 h, aeration 8 h, sedimentation time 1 h; Controlling main aeration tank DO is 0.5～1.5 mg/l; Water outlet place of MSBR reaction tank is provided with return line and is connected to the dilution water inlet of CSTR reactor waste water ingress, improves water inlet pH and provide nitrite nitrogen to prevent the reactor acidifying, and reflux ratio is 1:1.
Have after the feces of livestock and poultry anaerobic treatment at high ammonia nitrogen, high organic concentration among the present invention that biodegradability is poor, C/N is than problems such as little, aerobic after-treatment system denitrifying carbon source deficiency, poor processing effect, exploitation feces of livestock and poultry anaerobism is produced methane denitrification process simultaneously, resource utilization is used the energy of being stored in the feces of livestock and poultry, reduces the pollution of pollutent to environment simultaneously.Difference at denitrification denitrogenation microorganism and methanogen site conditions, functional flora distributes and dominant microflora in the research reactor, control by operational conditions, realization methanogen and denitrifying bacteria symbiosis lotus root are closed, realize that organic matter degradation produces methane, denitrogenation simultaneously solves the difficult problem that the animal dung anaerobic fermented liquid is handled.
In order to guarantee treatment effect, also optimized processing parameter among the present invention, invented technology principal feature and process parameter optimizing process are as follows:
(1) in the CSTR reactor, the anaerobic sludge that the inoculation organic solid waste is cultivated is finished and is produced denitrifying startup of methane and steady running simultaneously.
Mud is taken from the part that University Of Chongqing's laboratory mud and last stage tamed and is produced methane denitrification mud, water inlet is animal dung waste water, the reactor useful volume is 15L, be provided with agitator in the reactor, control stirring frequency with timer, the each stirring 20 minutes stirred once stirring frequency 30 r/min every 4 hours, application cycle hot-water heating system controlled temperature, temperature is between 30-35 ℃, and reactor residence time is 10d, is 6.5～7.8 because methanobacteria adapts to pH, best pH is 6.8～7.2, it is 6.0～8.0 that short-cut denitrification adapts to pH, and best pH is 7～8, so control CSTR reactor pH is about 7.5, according to the reactor load application of sample, adopt advance every day, the mode of discharging, turnover sample volume is identical, by test Inlet and outlet water COD, NO
2 --N, NO
3 --N, NH
4 +Indexs such as-N, pH value are judged reactor running condition.
Animal dung waste water COD starting point concentration is 28778 mg/L, ammonia nitrogen 871 mg/L, nitre nitrogen 42 mg/L progressively improve COD load and nitrite nitrogen load, are one-period with 5d, reactor COD load progressively is increased to 4 g/L from 0.5g/L, the nitrite nitrogen load is increased to 0.25 g/L by 0.05 g/L, and the CSTR single reactor COD clearance of the associating of being unrealized about 67.89%, can reach 76.23% substantially, the nitrite nitrogen clearance reaches more than 99%, and the aerogenesis load is by 0.1 LL at initial stage
-1D
-1Increase to 1 LL in latter stage
-1D
-1Along with influent load increases, gas production rate constantly rises, the sludge acclimatization degree steadily improves, but when intake COD load and nitrite nitrogen rose to a certain degree, it is big more that denitrifying bacterium suppresses degree to methanogen, though gas production rate constantly raises, do not increase but in fact produce methane content, the part of growth is N
2To the reaction later stage, when water inlet COD load and nitrite nitrogen load growth are arrived to a certain degree, produce methane denitrification balance in the reactor and broken, the COD clearance obviously descends, and possible cause has the anti-nitration reaction reservoir capacity than producing the methane reaction height, works as NO
x -Anti-nitration reaction took place prior to producing methane reaction when-N existed, and caused a large amount of breedings of denitrifying bacteria to become the dominant microflora in the system and methanogen is eliminated; NO
x -The existence of-N raises the redox potential of reaction system, to the active restraining effect that produces of methanogen; NO
x --N may have direct toxicity to methanogen.By observation analysis, because when the COD influent load reached 4 g/L, the COD clearance can reach about 70%, factor of created gase is stabilized in 1m
3/ (m
3D), and clearance presents exponential type and increases, adopt influent load 3 g/L so draft, the water inlet nitrite nitrogen keeps good situation clearance to be stabilized in more than 99% always always, but too high nitrite nitrogen can impel denitrifying bacterium growth and the growth of inhibition methanogen fast, cause system unbalance,, continue to increase the reaction load for not avoiding system at the balance phenomenon that takes place between denitrification and the product methane.
(2) the MSBR system realizes nitration denitrification.
Mud is taken from granule sludge in laboratory UASB of University Of Chongqing and the aeration tank reactor, and it is anoxia stirring 1 h that continuous water-inlet continuous water-outlet, SBR pond reaction times are taked in experiment, aeration 8 h, and sedimentation time 1 a h.2 SBR pond replaces water outlet.The main aeration tank DO of control is 0.5～1.5 mg/l in real time, initial stage is because the influent ammonia nitrogen load is excessive, reasons such as reactor transition cause results such as ammonia nitrogen removal, short distance nitration bad, to about the 20th d, change influent load, take into water CSTR water outlet to mix according to the ratio of 1:1, and add certain NH with tap water
4Cl guarantees that influent ammonium concentration is 413 mg/l, COD concentration is 5000～6000 mg/l, it is stable that reactor reaches rapidly, clearance is significantly improved, possible cause is that mud is the desirable mud of taming 100 days, and reactor initial stage influent ammonia nitrogen load is excessive, causes processing efficiency little, but high ammonia nitrogen influent load does not have big influence to the ammonia oxidizing bacteria in the mud and can suppress the growth of other bacteriums, and this makes that mud can shake down rapidly when reducing ammonia nitrogen concentration.Waste water is COD clearance 91.25% after CSTR associating MSBR handles, and recirculation water nitrite nitrogen clearance is more than 95%, and ammonia nitrogen removal frank reaches more than 93%, and factor of created gase reaches 1 LL
-1D
-1
In sum, the present invention has the following advantages: the invention solves 1, that existing animal dung wastewater processing technology exists that biodegradability is poor, C/N is than the problem of little, aerobic after-treatment system denitrifying carbon source deficiency, poor processing effect, and CSTR associating MSBR art breading liquid dung proposed first, remove when realizing waste water COD, nitrite nitrogen, ammonia nitrogen, can make ammonia nitrogen removal frank more than 93%, recirculation water nitrite nitrogen clearance is more than 95%, the COD clearance reaches more than 91.25%, and the aerogenesis load reaches and is stabilized in 1LL
-1D
-1About, have good treatment effect.2, unite in the MSBR technological process at CSTR among the present invention, adopted the technology of MSBR effluent recycling to CSTR, dilution water inlet, raising water inlet pH also provide nitrite nitrogen to prevent the reactor acidifying, and minimizing subsequent processing device pressure.3, among the present invention, after CSTR, adopt vertical sedimentation basin, can make mud be back to CSTR, made CSTR associating MSBR handle simultaneously, obtained addition, saved the sludge yield of 40% carbon source, 25% oxygen requirement and 300%.4, the present invention handles by CSTR associating MSBR, and it is excessive or too small that CSTR and MSBR can remedy pH, the operation of stopping reaction device, and the nitrite nitrogen that MSBR produces is back to the CSTR denitrification, not only can replenish basicity among the CSTR, can also prevent the reactor acidifying.
Description of drawings
Accompanying drawing 1 is process route chart of the present invention.
The orthographic plan of accompanying drawing 2 MSBR reaction tanks.
The device simplified schematic diagram that accompanying drawing 3 the present invention adopt.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and specific examples.
Fig. 1 is a process route chart of the present invention, as shown in it, during the invention process, comprise that employing CSTR reactor produces the methane denitrification, vertical sedimentation basin precipitates and mud refluxes, adopt the MSBR reaction tank to carry out short-cut nitrification and denitrification, water outlet rear section water is back to steps such as CSTR reactor.
Fig. 2 is the orthographic plan of MSBR reaction tank, as shown in it, the MSBR reaction tank includes anaerobic pond, two anoxic pond, mud-water separation pond, main aeration tank and two SBR ponds, the structure and the workflow of independent MSBR reaction tank belong to prior art, the present invention is to have adopted MSBR reaction tank and CSTR associating to the contribution of prior art, and has optimized as processing parameter conditions such as aeration rates at process object.
Accompanying drawing 3 technical process simplified schematic diagram of the present invention, 1 is the CSTR reactor among Fig. 3, and 2 is vertical sedimentation basin, and 3 is the MSBR reaction tank, and 4 is the pump machine.This figure can clearly show each reaction unit water inlet and water outlet position, and mud refluxes and the position of effluent recycling, all adopts the pump machine to control in mud backflow and the effluent recycling as shown in the figure.
Example:
(a) get fresh waste water containing pig excrement, through the double-deck iron sand net filtration of 1mm, the waste water containing pig excrement significant parameter value COD 20000mg/L after the filtration, NH
4 +Concentration be 887 mg/L, nitrite nitrogen concentration 17 mg/L, nitre nitrogen 42 mg/L, effluent recycling are than 1:1, influent load 2.6 kgCODm
-3D
-1With nitrite nitrogen concentration 165mg/l.CSTR reactor useful volume is 15L, pH in the control CSTR reactor is 7.5, heating cycle water tank controlled temperature is between 30-35 ℃, use timer control stirring frequency, it is each the stirring 20 minutes that the CSTR reactor stirs rule, stirs once stirring frequency 30 r/min every 4 hours, hydraulic detention time is 10d, and the Inlet and outlet water volume is identical.After testing, the COD clearance of final livestock and poultry fecaluria is basicly stable about 75%, and the nitrite nitrogen clearance is more than 99%.
(b) water outlet of CSTR reactor enters the MSBR pond through the vertical sedimentation basin post precipitation, enter MSBR by volume pump and carry out short distance nitration, nitrated or while nitration denitrification, find that by ammonia nitrogen, nitric nitrogen and nitrite nitrogen concentration in the reactor water outlet part nitrite nitrogen, nitre nitrogen denitrification take place is removed in reactor, therefore infer nitration denitrification reaction has simultaneously taken place in the reactor.The reaction times in control SBR pond is anoxia stirring 1 h during reaction, aeration 8 h, sedimentation time 1 h; Controlling main aeration tank DO is 0.5～1.5 mg/l.By detecting, the water outlet ammonia nitrogen removal frank can reach more than 99%, and the COD clearance reaches about 65%.
(c) prove through example detection, nitrite nitrogen and nitric nitrogen clearance reach more than 95% behind waste water containing pig excrement process CSTR product methane denitrification-MSBR nitration denitrification cooperation, ammonia nitrogen removal frank is stabilized in 91.90%, reach as high as 99.90%, the COD clearance is more than 91.25%, and the aerogenesis steady load is at 1m
3/ (m
3D) about.
Conclusion: because pig is modal livestock and poultry kind, pig manure urine is representative in animal dung waste water, and the composition of all kinds of animal dung waste water is also roughly the same, so as can be known, the present invention is suitable equally for other animal dung waste water.
Claims (2)
1. an animal dung method of wastewater treatment is characterized in that, adopts the CSTR reactor to produce the methane denitrification simultaneously earlier and handles, and adopts the MSBR reaction tank to carry out nitration denitrification again and handles.
2. animal dung method of wastewater treatment as claimed in claim 1, it is characterized in that, this method adopts a CSTR reactor, a vertical sedimentation basin and a MSBR reaction tank to implement, wherein said CSTR reactor lower end is provided with the waste water import, the upper end is provided with wastewater outlet and is connected to vertical sedimentation basin, vertical sedimentation basin lower end mud discharging mouth adopts the waste water ingress of the pipe connection of band pump machine to CSTR reactor lower end, and the overflow weir outlet of vertical sedimentation basin upper end is connected to the MSBR reaction tank; When present method was implemented, the product methane denitrification mud that the inoculation of CSTR reactor has been tamed, animal dung waste water produced the operation of methane denitrification after entering the CSTR reactor simultaneously, and control COD influent load is lower than 4.0kgCODm
-3D
-1, control NO
2 -The N influent load is lower than 0.25kgm
-3D
-1PH in the control CSTR reactor is 7.5, temperature is 30～35 ℃, it is each the stirring 20 minutes that the CSTR reactor stirs rule, stirred once every 4 hours, stirring frequency 30 r/min, the CSTR reactor wastewater treatment residence time is 10 days, after CSTR reactor internal reaction finishes, waste water enters into the MSBR reaction tank through the vertical sedimentation basin post precipitation and handles, when the MSBR reaction tank is handled, adopt 2 SBR ponds to replace water outlet, the reaction times of controlling the SBR pond simultaneously is anoxia stirring 1 h, aeration 8 h, sedimentation time 1 h; Controlling main aeration tank DO is 0.5～1.5 mg/l; Water outlet place of MSBR reaction tank is provided with return line and is connected to the dilution water inlet of CSTR reactor waste water ingress, improves water inlet pH and provide nitrite nitrogen to prevent the reactor acidifying, and reflux ratio is 1:1.
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Cited By (4)
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| WO2018157766A1 (en) * | 2017-03-02 | 2018-09-07 | 可事托环保设备（上海）有限公司 | Multi-unit modified sequencing batch reactor and applications thereof |
| CN108793409A (en) * | 2018-08-29 | 2018-11-13 | 陕西朗正环保科技有限公司 | A kind of sewage-treatment plant suitable for country sewage changes in flow rate |
| CN110627538A (en) * | 2019-10-12 | 2019-12-31 | 武汉欧瑞景环保科技有限公司 | Livestock breeding excrement treatment method and preparation method of waste residue organic fertilizer |
| CN116177746A (en) * | 2023-04-18 | 2023-05-30 | 中国市政工程华北设计研究总院有限公司 | Low-carbon-emission septic tank and sewage treatment process thereof |
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| CN101531437A (en) * | 2008-03-12 | 2009-09-16 | 中国科学院成都生物研究所 | Compound treatment method of wastewater in pig farm |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018157766A1 (en) * | 2017-03-02 | 2018-09-07 | 可事托环保设备（上海）有限公司 | Multi-unit modified sequencing batch reactor and applications thereof |
| CN108793409A (en) * | 2018-08-29 | 2018-11-13 | 陕西朗正环保科技有限公司 | A kind of sewage-treatment plant suitable for country sewage changes in flow rate |
| CN108793409B (en) * | 2018-08-29 | 2023-12-29 | 中化学朗正环保科技有限公司 | Sewage treatment device suitable for rural sewage flow change |
| CN110627538A (en) * | 2019-10-12 | 2019-12-31 | 武汉欧瑞景环保科技有限公司 | Livestock breeding excrement treatment method and preparation method of waste residue organic fertilizer |
| CN116177746A (en) * | 2023-04-18 | 2023-05-30 | 中国市政工程华北设计研究总院有限公司 | Low-carbon-emission septic tank and sewage treatment process thereof |
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