CN105060623A - Double-sludge sewage treating method based on coupling of production of hydrogen and acetic acid and hydrogenotrophic denitrification - Google Patents
Double-sludge sewage treating method based on coupling of production of hydrogen and acetic acid and hydrogenotrophic denitrification Download PDFInfo
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- CN105060623A CN105060623A CN201510449843.4A CN201510449843A CN105060623A CN 105060623 A CN105060623 A CN 105060623A CN 201510449843 A CN201510449843 A CN 201510449843A CN 105060623 A CN105060623 A CN 105060623A
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Abstract
The invention relates to a method for removing pollution substances like nitrogen and phosphorus in sewage in shortage of a carbon source and provides a double-sludge sewage carbon-nitrogen-phosphorus removal method based on a hydrogen-acetic acid production/hydrogenotrophic denitrification coupling mechanism and used for treating municipal sewage. The method provided by the invention overcomes the problems of difficult collection of gas and poor digestion efficiency when anaerobic digestion is used as pretreatment process and provides a high-quality carbon source acetic acid for subsequent nitrogen and phosphorus removal process. The method comprises the following main steps that: sewage having been treated in a sand basin enters a hydrogen-acetic acid production/hydrogenotrophic denitrification coupling reaction tank and process effluent flows back to the coupling reaction tank; the sewage enters a primary sedimentation basin for solid-liquid separation after reaction, and concentrated sludge flows back to the coupling reaction tank; supernatant of the primary sedimentation basin enters a subsequent anaerobic/anoxic/aerobic activated sludge reaction tank for synchronous removal of nitrogen and phosphorus; and mixed liquor obtained after reaction enters a secondary sedimentation basin for solid-liquid separation, wherein obtained supernatant is treated water, and obtained concentration sludge flows back to the anaerobic/anoxic/aerobic activated sludge reaction tank.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, be specifically related to the minimizing technology of the pollution substance such as nitrogen, phosphorus in the sewage of carbon source shortage.
Background technology
20 century 70s, the outburst of global energy dilemma, Anaerobic Microbiological Treatment Technology is used widely owing to having the advantages such as less energy-consumption, floor space are little.In May, 1997, in the 8th the international anaerobic digestion symposial that Japanese celestial platform is held, the achievement in research of Anaerobic Microbiological Treatment Technology acquired by Treating Municipal Sewage is noticeable.Professor Lettinga asserts: if there is suitable post-treating method, Anaerobic Microbiological Treatment Technology can become the effective means of dispersion type domestic wastewater process.Along with the increasingly extensive application of Anaerobic Microbiological Treatment Technology, aftertreatment aerobic reactor water outlet containing nitrate nitrogen is directly back to the anaerobic reactor of front end by investigator, achieve anaerobic methane production and denitrifying coupling, reach the object of carbon elimination denitrogenation simultaneously.But because the municipal effluent water yield is large, pollutant concentration is low, water temperature is low, anaerobic methane production and denitrification coupling process is adopted to remove carbon and nitrogen, the methane produced not easily collecting and anaerobic digestion efficiency is poor, this popularization degree that will cause Anaerobic Methods in Treating in municipal sewage treatment is not enough.
A large amount of experimental studies and engineering practice show, acetic acid is the high-quality carbon source of most of microorganism in biological treatment of waste water system, if anaerobic reactor acetic acid producing rate can be improved, both the consumption of anaerobism section carbon source can have been made to reduce, improve de-single treatment effect of low carbon-nitrogen ratio sewage, can methane emission be reduced again, reduce Greenhouse effect.
Anaerobic digestion process is divided into 3 stages under normal circumstances, hydrogenesis and acetogenesis process be wherein by acidogenic fermentation stage two carbon more than organic acid (except acetic acid) and alcohol be converted into acetic acid, H
2, CO
2deng, and produce the process of new cellular material.The bacterium participating in hydrogenesis and acetogenesis process is hydrogen-producing acetogenic bacteria (H
2-producingacetogens, HPA).At the standard conditions, the reaction of hydrogen-producing acetogenic bacteria degraded short chain fatty acid spontaneously can not carry out (Δ G
o>0).Therefore, for improving acetic acid producing rate, one thermodynamically next " pulling " non-incident hydrogenesis and acetogenesis process in theory of incidental reaction must be utilized.
Summary of the invention
The object of the invention is the energy consumption in order to reduce wastewater treatment, improving the utilization of carbon source rate of low carbon-nitrogen ratio sewage, and a kind of two dirt water carbon elimination denitrification dephosphorization technique methods based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism of exploitation.
The method that the carbon nitrogen phosphorus of low ratio of carbon to ammonium municipal effluent is removed simultaneously realizes according to the following steps: the waste water 1. from municipal drainage pipe network enters hydrogenesis and acetogenesis/denitrification coupling reaction pond after settling pit process, second-level settling pond water outlet simultaneously and first stage precipitation tank thickened sludge are back to this pond respectively, and reflux ratio is 1; The hydraulic detention time in this pond is 4 ~ 6h, and adopting hydraulic method to control sludge age is 15 ~ 20d; 2. the water outlet of coupling reaction pond enters first stage precipitation tank and carries out solid-liquid separation, and the sedimentation time of first stage precipitation tank is 2 ~ 3h; 3. first stage precipitation tank supernatant water enters follow-up anaerobic/anoxic/aerobic activated sludge reaction tank, the thickened sludge of second-level settling pond is back to the anaerobism section in this pond simultaneously, reflux ratio is 0.5 ~ 1, the total hrt in this pond is 8 ~ 10h, nitrification liquid nitrate recirculation ratio is 1 ~ 3, and adopting hydraulic method to control sludge age is 10 ~ 12d; 4. anaerobic/anoxic/aerobic activated sludge reaction tank water outlet enters second-level settling pond and carries out solid-liquid separation, and sedimentation time is 3 ~ 4h, and supernatant water discharges, and completes sewage treatment process.
inventive principle and advantage
In normal conditions, the reaction of hydrogen-producing acetogens degraded short chain fatty acid can not spontaneously be carried out mostly, as the Δ G of ethanol of degrading
0for the Δ G of+9.6kJ/mol, degraded butyric acid
0for the Δ G of+48.1kJ/mol, degraded propionic acid
0for+76.1kJ/mol, therefore needing just can complete metabolic process with hydrogen-consuming bacteria syntrophism symbiosis (as consumed producing hydrogen and methane bacterium), namely only having as H in system
2when pressure is enough low, the pressure as hydrogen is 10
-6during individual normal atmosphere, the Gibbs free energy of hydrogenesis and acetogenesis reaction process will change.And hydrogen autotrophic denitrification bacterium denitrification process Δ G
0for-224kJ/mol.According to the standard Gibbs free energy of reaction process, the denitrification process of hydrogen autotrophic denitrification bacterium " can pull " hydrogenesis and acetogenesis process, and two kinds of floras can syntrophism growth.Therefore, reflux in anaerobic acid-production reaction tank nitrated after waste water, the system that hydrogenesis and acetogenesis and hydrogen autotrophic denitrification are collaborative can be formed, while denitrogenation, achieve the de-carbon in process, and improve acetic acid producing rate, take full advantage of carbon source limited in municipal wastewater.
Accompanying drawing explanation
Fig. 1 is the two dirt mud carbon elimination denitrification dephosphorization technique schematic flow sheets based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism.1 is water inlet, and 2 is hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond, and 3 is first stage precipitation tank, 4 is anaerobic pond, and 5 is anoxic pond, and 6 is Aerobic Pond, 7 is second-level settling pond, 8 is coupled reactor sludge reflux, and 9 is synchronous denitrification dephosphorizing reaction tank sludge reflux, and 10 is effluent recycling, 11 is the backflow of Aerobic Pond nitrification liquid, 12 is water outlet, and 13 is coupling reaction pond excess sludge, and 14 is synchronous denitrification dephosphorizing reaction tank excess sludge.
Embodiment
Embodiment one: present embodiment is the two dirt water carbon elimination denitrification dephosphorization technique methods based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism, specifically complete according to the following steps: the waste water 1. from municipal drainage pipe network enters hydrogenesis and acetogenesis/denitrification coupling reaction pond after settling pit process, second-level settling pond water outlet simultaneously and first stage precipitation tank thickened sludge are back to this pond respectively, and reflux ratio is 0.5 ~ 1.5; The hydraulic detention time in this pond is 4 ~ 6h, and adopting hydraulic method to control sludge age is 15 ~ 20d; 2. the water outlet of coupling reaction pond enters first stage precipitation tank and carries out solid-liquid separation, and the sedimentation time of first stage precipitation tank is 2 ~ 3h; 3. first stage precipitation tank supernatant water enters follow-up anaerobic/anoxic/aerobic activated sludge reaction tank, the thickened sludge of second-level settling pond is back to the anaerobism section in this pond simultaneously, reflux ratio is 0.5 ~ 1, the total hrt in this pond is 8 ~ 10h, nitrification liquid nitrate recirculation ratio is 1 ~ 3, and adopting hydraulic method to control sludge age is 10 ~ 12d; 4. anaerobic/anoxic/aerobic activated sludge reaction tank water outlet enters second-level settling pond and carries out solid-liquid separation, and sedimentation time is 3 ~ 4h, and supernatant water discharges, and completes sewage treatment process.
Embodiment two: the difference of present embodiment and embodiment one be step 1. in hydrogenesis and acetogenesis/denitrification coupling reaction tank waterpower residence time be 5h, other are identical with embodiment one.
Embodiment three: the difference of present embodiment and embodiment one or two be step 1. in hydrogenesis and acetogenesis/denitrification coupling reaction pond sludge age be 18d, other are identical with embodiment one or two.
Embodiment four: the difference of present embodiment and embodiment one to three be step 1. return sludge ratio be 1, other are identical with embodiment one to three.
Embodiment five: the difference of present embodiment and embodiment one to four be step 1. in second-level settling pond supernatant liquor reflux ratio be 1, other are identical with embodiment one to four.
Embodiment six: the difference of present embodiment and embodiment one to five be step 2. in the sedimentation time of first stage precipitation tank be 2.5h, other are identical with embodiment one to five.
Claims (6)
1. the method based on two mud carbon elimination denitrification dephosphorization technique Treating Municipal Sewage of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism, it is characterized in that described method comprises the steps: 1. after settling pit process, to enter hydrogenesis and acetogenesis/denitrification coupling reaction pond from the waste water of municipal drainage pipe network, second-level settling pond water outlet simultaneously and first stage precipitation tank thickened sludge are back to this pond respectively, and reflux ratio is 0.5 ~ 1.5; The hydraulic detention time in this pond is 4 ~ 6h, and adopting hydraulic method to control sludge age is 15 ~ 20d; 2. the water outlet of coupling reaction pond enters first stage precipitation tank and carries out solid-liquid separation, and the sedimentation time of first stage precipitation tank is 2 ~ 3h; 3. first stage precipitation tank supernatant water enters follow-up anaerobic/anoxic/aerobic activated sludge reaction tank, the thickened sludge of second-level settling pond is back to the anaerobism section in this pond simultaneously, reflux ratio is 0.5 ~ 1, the total hrt in this pond is 8 ~ 10h, nitrification liquid nitrate recirculation ratio is 1 ~ 3, and adopting hydraulic method to control sludge age is 10 ~ 12d; 4. anaerobic/anoxic/aerobic activated sludge reaction tank water outlet enters second-level settling pond and carries out solid-liquid separation, and sedimentation time is 3 ~ 4h, and supernatant water discharges, and completes sewage treatment process.
2. the method for the two mud carbon elimination denitrification dephosphorization technique Treating Municipal Sewage based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1, is characterized in that: step 1. in hydrogenesis and acetogenesis/denitrification coupling reaction tank waterpower residence time be 5h.
3. the method for the two mud carbon elimination denitrification dephosphorization technique Treating Municipal Sewage based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1, is characterized in that: step 1. in hydrogenesis and acetogenesis/denitrification coupling reaction pond sludge age be 18d.
4. the method for the two mud carbon elimination denitrification dephosphorization technique Treating Municipal Sewage based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1, is characterized in that: step 1. return sludge ratio is 1.
5. the method for the two mud carbon elimination denitrification dephosphorization technique Treating Municipal Sewage based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1, is characterized in that: step 1. middle second-level settling pond supernatant liquor reflux ratio is 1.
6. the method for the two mud carbon elimination denitrification dephosphorization technique Treating Municipal Sewage based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1, is characterized in that: step 2. in the sedimentation time of first stage precipitation tank be 2.5h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105906052A (en) * | 2016-06-08 | 2016-08-31 | 广东省工程技术研究所 | Coupling anaerobic sludge acidogenesis mud-film two-phase composite A/A/O system and technology |
| CN111925077A (en) * | 2020-09-09 | 2020-11-13 | 北京涞澈科技发展有限公司 | Distributed domestic sewage integrated treatment system and process |
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Patent Citations (6)
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| JP5391010B2 (en) * | 2009-09-18 | 2014-01-15 | 中国電力株式会社 | Operation method of denitrification reactor |
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| CN111925077A (en) * | 2020-09-09 | 2020-11-13 | 北京涞澈科技发展有限公司 | Distributed domestic sewage integrated treatment system and process |
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