CN105060622A - Method for simultaneous removal of carbon, nitrogen and phosphorus in tri-sludge sewage and stabilization treatment of sludge - Google Patents
Method for simultaneous removal of carbon, nitrogen and phosphorus in tri-sludge sewage and stabilization treatment of sludge Download PDFInfo
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Abstract
The invention relates to a in-depth treating method for municipal sewage and provides a method for simultaneous removal of carbon, nitrogen and phosphorus in tri-sludge sewage and stabilization treatment of sludge hydrogen-acetic acid production/hydrogenotrophic denitrification coupling effect. The method provided by the invention eliminates inherent contradictions of nitrogen and phosphorus removal process, provides a high-quality carbon source for phosphorus removal and overcomes the problem of easy acidification of an acid-producing phase of two-phase sludge anaerobic digestion 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; the reacted 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 biological phosphorus removal tank and then enters a secondary sedimentation basin for solid-liquid separation after completion of phosphorus release and phosphorus absorption; the obtained concentrated sludge flows back to the biological phosphorus removal tank, and obtained supernatant enters a biomembrane nitration reaction tank; and a part of nitration effluent is discharged, another part of nitration effluent flows back to the coupling reaction tank, and the rest of nitration effluent enters an anaerobic acid-producing reaction tank and enters an anaerobic methane-producing reaction tank after hydrolysis and acidifying.
Description
Technical field
The present invention relates to a kind of method of city sewage and sludge process, belong to public works, environmental engineering technical field of waste water processing.
Background technology
At present, domestic and international body eutrophication phenomenon is more and more serious, and be therefore water conservation, the nutrient nitrogen in point source sewage and phosphorus must be removed.But, saprobia synchronous denitrification dephosphorizing process is more complicated, wherein relate to BOD degraded, nitrated, denitrification, release phosphorus and inhale multiple biochemical reactions such as phosphorus, and the requirement of each reaction process to microorganism composition and content, substrate type and envrionment conditions is all not identical, therefore in single mud and sewage biological treatment system, realize simultaneous denitrification and dephosphorization, inevitably produce multiple contradictory relation.Meanwhile, carbon source kind is comparatively large on active sludge phosphorus release rate, denitrification rate impact, facts have proved that acetic acid is the high-quality carbon source of denitrification dephosphorization system.
In sewage treatment process, mud is absolutely necessary by product, and sludge yield can reach 0.3 ~ 0.5% (calculating by volume) or 1 ~ 2% (the calculating in mass) of sewage load usually.If there is advanced treatment process in sewage work, then sludge yield also can increase by 0.5 ~ 1.0 times, therefore, needs to take economy, effective means processes.Containing abundant nutritive element in municipal sludge, if adopt Anaerobic Digestion technology, minimizing and the stabilization of mud can also be realized simultaneously in the process of mud being carried out to anaerobic treatment, and form methane.But the problems such as traditional anaerobic digestion techniques exists, and processing efficiency is low, the residence time long, gas production rate is few.Therefore from anaerobic digestion techniques principle, attract attention producing the sour TPAD technology be separated with methanogenic phase mutually by people gradually owing to eliminating above-mentioned determination.But TPAD technique is in operation, produces acid and easily occur acidifying problem mutually, and cause operating performance unstable.
To sum up, how to eliminate the intrinsic contradictions of synchronous denitrification dephosphorizing process in Sewage treatment systems, for releasing phosphorus and denitrification provides high-quality carbon source, and solving sludge treating system acidifying problem, is the key that urban sewage treatment system produces good social benefit, economic benefit and environmental benefit.Summary of the invention
Content of the present invention is the intrinsic contradictions in order to eliminate synchronous denitrification dephosphorizing process in Sewage treatment systems, for releasing phosphorus and denitrification provides high-quality carbon source, and solve sludge treating system acidifying problem, and develop a kind of three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling and remove and the method for sludge stabilizing simultaneously.
The present invention solves the problems of the technologies described above the technical scheme taked to be: sewage carbon nitrogen phosphorus of the present invention is removed simultaneously and the method for sludge stabilizing 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, microbial film nitrification tank 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 17 ~ 23d; 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 aerobic/anaerobic activated sludge reaction pond, the thickened sludge of second-level settling pond is back to the anaerobism section in this pond simultaneously, reflux ratio is 0.25 ~ 0.75, and the total hrt in this pond is 4 ~ 6h, and adopting hydraulic method to control sludge age is 10 ~ 12d; 4. the water outlet of aerobic/anaerobic activated sludge reaction pond enters second-level settling pond and carries out solid-liquid separation, and sedimentation time is 1 ~ 3h; 5. second-level settling pond water outlet enters microbial film nitrification tank, and this tank waterpower residence time is 8 ~ 10h; 6. the water outlet of microbial film nitration reaction pond is divided into 3 parts: a part is directly discharged, and a part is back to hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond, and a part enters follow-up sludge anaerobic and produces in sour phase reaction; 7. hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond discharge excess sludge and aerobic/anaerobic activated sludge reaction pond discharge excess sludge enter anaerobic acid-production phase reaction pond, and mud is 1 ~ 3d in the residence time in this pond; 8. the supernatant liquor in sludge anaerobic acidogenic phase reactor enters aerobic/anaerobic activated sludge reaction pond, and mud enters methanogenic phase reactor, and the residence time of methanogenic phase reactor is 4 ~ 10d.
inventive principle and advantage
Sewage treatment systems of the present invention is three sludge systems, containing fermenting bacteria, hydrogen-producing acetogenic bacteria, hydrogen autotrophic denitrification bacterium, heterotrophic denitrifying Bacteria etc. in the active sludge of the Sewage treatment systems be made up of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond and first order reaction pond, complete fermentation wherein and produce the reactions such as lower fatty acid, hydrogenesis and acetogenesis, denitrification, acetic acid producing rate is improved, for follow-up Biological Phosphorus Removal System provides high-quality carbon source acetic acid while reduction TN concentration.Containing heterotrophic bacterium and polyP bacteria in the active sludge of the Sewage treatment systems be made up of aerobic/anaerobic activated sludge reaction pond and second-level settling pond, it is Biological Phosphorus Removal System.In microbial film nitration reaction pond, nitrifier becomes excellent and accounts for Pseudomonas, completes nitration reaction, and water outlet can be discharged.The pond water outlet of microbial film nitration reaction is divided into 3 parts: a part is directly discharged, and a part is back to hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond, and a part enters follow-up sludge anaerobic and produces in sour phase reaction.In hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond and anaerobic acid-production phase reaction pond, complete denitrification respectively and fermentation reaction, hydrogenesis and acetogenesis react simultaneously, wherein fermenting process can be heterotrophic denitrification and provides high-quality carbon source, improve denitrification efficiency, hydrogen autotrophic denitrification process " can pull " hydrogenesis and acetogenesis process, improve acetic acid producing rate, for follow-up methane phase reaction provides high-quality carbon source.In addition, nitrification liquid containing high concentration nitrate enters hydrogenesis and acetogenesis/hydrogen autotrophic denitrification anaerobic acid-production phase reaction pond, the redox potential in pond can be changed, be conducive to fermenting bacteria, hydrogen-producing acetogens and denitrifying bacteria existence, and the growth of methanogen can be suppressed to a certain extent.The existence of heterotrophic denitrifying Bacteria can consume tunning, prevents sludge anaerobic from producing sour phase reaction pond acidifying.
Accompanying drawing explanation
Fig. 1 removes and sludge stabilization treatment process flow diagram based on three mud and sewage carbon nitrogen phosphorus of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling simultaneously.1 water inlet, 2 hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond, 3 first stage precipitation tank, 4 P releasing tanks, 5 inhale phosphorus pond, 6 second-level settling ponds, 7 nitrification tanks, 8 water outlets, 9 coupling reaction pond returned sluges, 10 biological phosphate-eliminating pond returned sluges, 11 nitrification liquid circulations, 12 nitrification liquid backflows, 13 mud hydrogenesis and acetogenesis/denitrification coupling reaction pond, 14 methane phase ponds, 15 hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond excess sludge, 16 biological phosphate-eliminating pond excess sludges, 17 supernatant liquor backflows, 18 sludge disposals.
Embodiment
Embodiment one: simultaneously present embodiment removes and sludge stabilization treatment processing method based on three mud and sewage carbon nitrogen phosphorus of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling, 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, microbial film nitrification tank 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 17 ~ 23d; 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 aerobic/anaerobic activated sludge reaction pond, the thickened sludge of second-level settling pond is back to the anaerobism section in this pond simultaneously, reflux ratio is 0.25 ~ 0.75, and the total hrt in this pond is 4 ~ 6h, and adopting hydraulic method to control sludge age is 10 ~ 12d; 4. the water outlet of aerobic/anaerobic activated sludge reaction pond enters second-level settling pond and carries out solid-liquid separation, and sedimentation time is 1 ~ 3h; 5. second-level settling pond water outlet enters microbial film nitrification tank, and this tank waterpower residence time is 8 ~ 10h; 6. the water outlet of microbial film nitration reaction pond is divided into 3 parts: a part is directly discharged, and a part is back to hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond, and a part enters follow-up sludge anaerobic and produces in sour phase reaction; 7. hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond discharge excess sludge and aerobic/anaerobic activated sludge reaction pond discharge excess sludge enter anaerobic acid-production phase reaction pond, and mud is 1 ~ 3d in the residence time in this pond; 8. the supernatant liquor in sludge anaerobic acidogenic phase reactor enters aerobic/anaerobic activated sludge reaction pond, and mud enters methanogenic phase reactor, and the residence time of methanogenic phase reactor is 4 ~ 10d.
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 5.5h, 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 19d, 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 0.75, other are identical with embodiment one to three.
Embodiment five: present embodiment and the difference of embodiment one to four be step 1. in microbial film nitrification tank effluent recycling ratio be 1.5, 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 3h, other are identical with embodiment one to five.
Embodiment seven: the difference of present embodiment and embodiment one to six is that 7. the middle anaerobic acid-production phase reaction pond residence time is 2d to step, and other are identical with embodiment one to six.
Embodiment eight: the difference of present embodiment and embodiment one to seven is that 8. the middle anaerobic methane production phase reaction pond residence time is 7.5d to step, and other are identical with embodiment one to seven.
Claims (8)
1. remove and sludge stabilization treatment method based on three mud and sewage carbon nitrogen phosphorus of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling for one kind simultaneously, 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, microbial film nitrification tank 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 17 ~ 23d; 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 aerobic/anaerobic activated sludge reaction pond, the thickened sludge of second-level settling pond is back to the anaerobism section in this pond simultaneously, reflux ratio is 0.25 ~ 0.75, and the total hrt in this pond is 4 ~ 6h, and adopting hydraulic method to control sludge age is 10 ~ 12d; 4. the water outlet of aerobic/anaerobic activated sludge reaction pond enters second-level settling pond and carries out solid-liquid separation, and sedimentation time is 1 ~ 3h; 5. second-level settling pond water outlet enters microbial film nitrification tank, and this tank waterpower residence time is 8 ~ 10h; 6. the water outlet of microbial film nitration reaction pond is divided into 3 parts: a part is directly discharged, and a part is back to hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond, and a part enters follow-up sludge anaerobic and produces in sour phase reaction; 7. hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling reaction pond discharge excess sludge and aerobic/anaerobic activated sludge reaction pond discharge excess sludge enter anaerobic acid-production phase reaction pond, and mud is 1 ~ 3d in the residence time in this pond; 8. the supernatant liquor in sludge anaerobic acidogenic phase reactor enters aerobic/anaerobic activated sludge reaction pond, and mud enters methanogenic phase reactor, and the residence time of methanogenic phase reactor is 4 ~ 10d.
2. the three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling according to claim 1 are removed and sludge stabilization treatment method simultaneously, it is characterized in that: step 1. in hydrogenesis and acetogenesis/denitrification coupling reaction tank waterpower residence time be 5.5h.
3. the three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling according to claim 1 are removed and sludge stabilization treatment method simultaneously, it is characterized in that: step 1. in hydrogenesis and acetogenesis/denitrification coupling reaction pond sludge age be 19d.
4. the three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling according to claim 1 are removed and sludge stabilization treatment method simultaneously, it is characterized in that: step 1. return sludge ratio is 0.75.
5. the three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling according to claim 1 are removed and sludge stabilization treatment method simultaneously, it is characterized in that: step 1. middle microbial film nitrification tank effluent recycling ratio is 1.5.
6. the three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling according to claim 1 are removed and sludge stabilization treatment method simultaneously, it is characterized in that: step 2. in the sedimentation time of first stage precipitation tank be 3h.
7. the three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling according to claim 1 are removed and sludge stabilization treatment method simultaneously, it is characterized in that: 7. the middle anaerobic acid-production phase reaction pond residence time is 2d to step.
8. the three mud and sewage carbon nitrogen phosphorus based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling according to claim 1 are removed and sludge stabilization treatment method simultaneously, it is characterized in that: 8. the middle anaerobic methane production phase reaction pond residence time is 7.5d to step.
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Cited By (3)
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| CN106007310A (en) * | 2016-07-06 | 2016-10-12 | 吉林建筑大学 | Ecological method for treating excess sludge |
| CN112744981A (en) * | 2020-12-25 | 2021-05-04 | 新疆水处理工程技术研究中心有限公司 | High-sulfur and high-COD wastewater treatment system and treatment method |
| 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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Cited By (3)
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| CN106007310A (en) * | 2016-07-06 | 2016-10-12 | 吉林建筑大学 | Ecological method for treating excess sludge |
| CN112744981A (en) * | 2020-12-25 | 2021-05-04 | 新疆水处理工程技术研究中心有限公司 | High-sulfur and high-COD wastewater treatment system and treatment method |
| 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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