CN103408141B - Device for improving N2O production in sewage treatment and control method thereof - Google Patents
Device for improving N2O production in sewage treatment and control method thereof Download PDFInfo
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- CN103408141B CN103408141B CN201310357185.7A CN201310357185A CN103408141B CN 103408141 B CN103408141 B CN 103408141B CN 201310357185 A CN201310357185 A CN 201310357185A CN 103408141 B CN103408141 B CN 103408141B
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Abstract
The invention discloses a device for improving N2O production in sewage treatment and a control method thereof. The device comprises a raw water tank, a water inlet pump, a short-cut nitrification liquid tank, a short-cut nitrification liquid inlet pump, an N2O production reactor and an air compressor. The N2O production reactor is a sealed SBR reactor. The N2O production reactor comprises a sealing cover, a water seal device, an agent filling inlet, an N2O collection pipe, a stirrer, an aeration gas pipe, an aeration head, a DO probe and a pH probe. The control method comprises that a sludge inner carbon source is used as a denitrification carbon source and nitrite inhibits the activity of an N2O reductase so that N2O accumulation is realized; and through aeration, N2O in the mixed liquid is blown into a gas phase and then is collected and the collected N2O can be used as an oxidizing agent for methane combustion so that production power is improved. The control method can improve production power of a sewage treatment plant, reduce an N2O release amount, reduce a sludge yield and reduce a denitrification carbon source demanded amount.
Description
Technical field
The present invention relates to N in a kind of enhanced sewage treating processes
2device and control method that O produces, belong to dirty water living creature processing technique field.
Background technology
N
2o is 6 kinds of greenhouse gases (CO of Kyoto Protocol regulation
2, CH
4, N
2o, HFCs, PFCs, SF
6one of), its stable chemical nature, in atmosphere, retention time is long, and global warming potential is CO
2190-270 doubly, also can damage the ozone layer simultaneously.In recent years, in order to control body eutrophication, the continuous upgrading of sewage work reaches the object of high-efficiency biological nitrogen and phosphorus removal, and N
2o quantity discharged increases thereupon year by year.It is estimated, 2005 to the N of sewage work between the year two thousand twenty
2o quantity discharged accounts for global N
2the ratio of O burst size will rise 13%.
At present to N in sewage work
2o produces with the research discharging and concentrates on N
2the control aspect that O discharges, and then extenuate Greenhouse effect.It mainly contains the following aspects: 1) based on N
2the research of O mechanism of production, uses oxygen N in mathematical model prediction sewage work
2the output of O; 2) by causing N in continuous discussion sewage work
2the factor that O produces: high NO
2 --N, internal carbon source denitrification,, there is DO etc. in the low DO in nitrifying process and denitrification process in low C/N, further improves N
2the measure of control of O.3) optimize the N of sewage work
2the sampling of O detects strategy, as methods such as on-line continuous detection and timing sampling detections, weighs the relative merits of every kind of method, is further the N of sewage work
2o produces and the sign of burst size provides valid data.
In addition N,
2the Enthalpies of Formation that O is degraded to nitrogen and oxygen is 82kJ/mol, is often used as the propelling agent of rocket, the ignition dope of motor vehicle engine, importantly N
2o replace oxygen can increase the production capacity of 329KJ/mol as oxygenant oxidizing of methylene, see formula (1) and formula (2).Therefore, if can enhancing sewage biological N in denitrification process
2o produces, and is collected subsequently the methane producing for oxidized sludge fermentation, can improve the energy that sewage work's methane oxidation process produces, and can also reach N simultaneously
2o burst size control object because in this process N
2o is reduced to N
2.
CH
4+4N
2O→CO
2+2H
2O+4N
2,△H
O R=-1219KJ/mol （1）
CH
4+2O
2→CO
2+2H
2O+4N
2,△H
O R=-890KJ/mol （2）
Summary of the invention
The present invention seeks in order to solve the problems of the technologies described above N in a kind of enhanced sewage treating processes of proposition
2device and control method that O produces.This invention, by utilizing sludge internal carbon source as denitrifying carbon source, utilizes the sub-nitrogen reductase activity of nitrite inhibited oxidation, improves endogenous denitrification process N
2o generation, thus be N
2o oxidizing of methylene improves sewage work's production capacity and provides the foundation.The present invention has changed traditional N
2o controls the thinking reducing discharging, N from strengthened denitrification process
2the generation of O is started with, and is then used further to methane oxidation and produces N
2thereby, the reverse N that solved
2the problem of O discharge; Meanwhile also improve the energy that sewage work's methyl hydride combustion power generation process produces.Show through material balance, the present invention can make sewage work oxygen requirement reduce by 20% reduce by 40% with sludge quantity, production capacity increases by 60%.
The object of the invention is to solve by the following technical programs: N in a kind of enhanced sewage treating processes
2the device that O produces.It is characterized in that: comprise former water tank 1, intake pump 2, short distance nitration liquid water tank 3, short distance nitration liquid pump 4, produce N
2o reactor 5, air compressor machine 6.Described product N
2o reactor 5 is a closed type SBR, is provided with sealing cover 5.9 and water seal arrangement 5.12, N
2o collection tube 5.13 and adding of agent mouth 5.11, in reactor, be provided with agitator 5.10 and stirring arm 5.8, reactor wall is provided with thief hole hold concurrently mud discharging mouth 5.2, rising pipe 5.7, DO probe 5.3 and pH probe 5.5, dissolved oxygen meter 5.4 is connected respectively corresponding probe with pH meter 5.6, and reactor bottom is provided with blow-down pipe 5.1.Former water tank 1 is by intake pump 2 and product N
2o reactor 5 is connected; Short distance nitration liquid water tank 3 is by short distance nitration liquid pump 4 and product N
2o reactor 5 is connected.
In device of the present invention, N in enhanced sewage treating processes
2o produce flow process as follows: first by intake pump by raw water to reactor, then at anaerobism agitation phases storage internal carbon source (PHAs), subsequently the short distance nitration liquid that contains nitrite is delivered in reactor, in the anoxia stirring stage, endogenous denitrification occurs, realize N
2o accumulates in mixed solution, then by aeration effect by its stripping to gas, finally will be containing N
2the collection and confinement of gases of O, is delivered to methyl hydride combustion generating set, by N
2o is reduced to N
2, finally realize N
2o reduces discharging, and improves the production capacity of methyl hydride combustion process simultaneously.
The invention provides one and utilize N in said apparatus enhanced sewage treating processes
2the method that O produces, is characterized in that comprising the following steps:
1) get the excess sludge of municipal sewage plant's Biological Phosphorus Removal System, join in reactor, adding rear activated sludge concentration MLSS is 1500-3000mg/L.
2) fill phase stirs in water inlet, the 5%-25% that water inlet volume is reactor volume.
3) anaerobism agitation phases working time is 1-2h.
4) enter the short distance nitration liquid stage and stir simultaneously, enter short distance nitration liquid and amass the 5-25% into reactor volume; Make nitrite nitrogen concentration in reactor increase to 15-40mg/L.
5) the anoxia stirring stage running time is 3-8h, and by on-line monitoring pH value, in the time that pH value starts to transfer decline to by rising, stops stirring.
6) aeration phase working time is 0.5-1.5h, and controlling DO concentration is 1.0-2.0mg.
7) discharge excess sludge is 3-10d by adjusting sludge volume Controlling System sludge age.
8) sedimentation time is 0.5-1.0h.
9) be 0.5-3.0h idle mixing time.
Know-why:
N in enhanced sewage treating processes
2the know-why that O produces is by utilizing sludge internal carbon source (PHAs) as denitrifying carbon source, suppressing N by nitrite
2o reductase activity, realizes N in denitrification process
2the accumulation of O; By follow-up aeration effect by the N in mixed solution
2o stripping, to gas, is finally realized N
2the collection utilization of O.
Now there are some researches show, high density nitrite can be to N in denitrification process
2o reductase activity produces and suppresses, and causes denitrification intermediate product N
2there is accumulation in O.The results of study such as Yang show N in the denitrification process using nitrite as electron acceptor(EA)
2o output is 1.5 times during using nitrate as electron acceptor(EA).Wang etc. in the Denitrifying Phosphorus Removal taking internal carbon source as denitrifying carbon source, find in the time adding nitrite replacement nitrate as electron acceptor(EA) N in research
2o productive rate improves 5 times; Find under the identical condition of denitrification C/N the N that utilizes internal carbon source to produce than outer carbon source simultaneously
2o is many.Propose to control denitrification process nitrite concentration and ensure denitrifying carbon source abundance based on above result of study Chinese scholars, thereby controlling N in sewage treatment process
2the burst size of O.But by N
2o discharges and reduces discharging and N
2o utilizes and considers, and, by utilizing sludge internal carbon source as denitrifying carbon source, controls nitrite concentration simultaneously, improves N in denitrification process
2o accumulation, then recycles N
2o oxidizing of methylene is realized N simultaneously
2the object that the control of O burst size and methyl hydride combustion production capacity increase.
N in a kind of enhanced sewage treating processes of the present invention
2the apparatus and method that O produces have the following advantages compared with traditional wastewater biological denitrification process:
1, compared with traditional nitration denitrification, this technology can be saved denitrifying carbon source 56%, because be only, nitrite nitrogen is reduced to N
2o, shortens reaction process.
2, can improve the energy that sewage work's methyl hydride combustion produces, because pass through N
2o replace oxygen, as oxygenant oxidizing of methylene, can the unit's of making methyl hydride combustion production capacity increase by 37%.
3, the living environment condition of sewage work can be improved, because bio-reactor is airtight, the diffusion of stink can be effectively controlled.
Brief description of the drawings
Fig. 1 is N in a kind of enhanced sewage treating processes of the present invention
2the structural representation of this device of device that O produces.
In figure, 1 is former water tank, and 1.1 is blow-down pipe, and 1.2 is water inlet pipe, and 1.3 is upflow tube; 2 is intake pump; 3 is that short distance nitration liquid water tank, 3.1 is blow-down pipe, and 3.2 is upflow tube; 4 is short distance nitration liquid pump; 5 for producing N
2o reactor, 5.1 is blow-down pipe, and 5.2 is the thief hole mud discharging mouth of holding concurrently, and 5.3 is DO probe, and 5.4 is dissolved oxygen meter, 5.5 is pH probe, and 5.6 is pH meter, and 5.7 is rising pipe, and 5.8 is stirring arm, and 5.9 is sealing cover, 5.10 is agitator, and 5.11 is adding of agent mouth, and 5.12 is water seal arrangement, and 5.13 is N
2o collection tube; 6 is air compressor machine, and 6.1 is that gas meter, 6.2 is that aeration flue, 6.3 is aeration head.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described: as scheme as shown in it N in a kind of enhanced sewage treating processes
2the device that O produces, 1 is former water tank, and 1.1 is blow-down pipe, and 1.2 is water inlet pipe, and 1.3 is upflow tube; 2 is intake pump; 3 is that short distance nitration liquid water tank, 3.1 is blow-down pipe, and 3.2 is upflow tube; 4 is short distance nitration liquid pump; 5 for producing N
2o reactor, 5.1 is blow-down pipe, and 5.2 is the thief hole mud discharging mouth of holding concurrently, and 5.3 is DO probe, and 5.4 is dissolved oxygen meter, 5.5 is pH probe, and 5.6 is pH meter, and 5.7 is rising pipe, and 5.8 is stirring arm, and 5.9 is sealing cover, 5.10 is agitator, and 5.11 is adding of agent mouth, and 5.12 is water seal arrangement, and 5.13 is N
2o collection tube; 6 is air compressor machine, and 6.1 is that gas meter, 6.2 is that aeration flue, 6.3 is aeration head.
Concrete test is taken from resident living area cesspool sewage with former water, and its concrete water-quality guideline is as follows: COD is 192-246mg/L; NH
4 +-N is 67-78mg/L, NO
2 --N≤0.1mg/L, NO
3 --N below detection line, PO
4 3--P is 5.1-6.8mg/L.Short distance nitration liquid is by artificial preparation, and its concrete water-quality guideline is as follows: COD is 45-78mg/L; NH
4 +-N is 0.2-3.5mg/L, NO
2 --N=40-60mg/L, NO
3 --N below detection line, PO
4 3--P is 0.1-1.7mg/L.Pilot system as shown in Figure 1, mainly contains former water tank, short distance nitration liquid water tank and produces N
2o reactor.Produce N
2o reactor useful volume is 10L.
Concrete operation method is as follows:
1) get the excess sludge of municipal sewage plant's Biological Phosphorus Removal System, join in reactor, adding rear activated sludge concentration MLSS is 2000mg/L.
2) fill phase stirs in water inlet, and water inlet volume is reactor volume 25%.
3) anaerobism agitation phases working time is 2h.
4) enter the short distance nitration liquid stage and stir simultaneously, enter short distance nitration liquid and amass as 25% of reactor volume.
5) the anoxia stirring stage running time is 3h.
6) aeration phase working time is 1h, and controlling DO concentration is 1.0-2.0mg/L.
7) discharge excess sludge is 10d by adjusting sludge volume Controlling System sludge age.
8) sedimentation time is 0.5h.
9) be 0.5h idle mixing time.
Test-results shows: after stable, and reactor water outlet NO
2 --N concentration is 0.1-0.8mg/L, its clearance 75-98%, N in anoxic denitrification process
2o accumulation rate is 15-60%, has realized N in enhanced biological nitrogen removal process
2the object that O produces.
Claims (1)
1. N in an enhanced sewage treating processes
2the method that O produces, application is as lower device, and this device comprises former water tank (1), intake pump (2), short distance nitration liquid water tank (3), short distance nitration liquid pump (4), produces N
2o reactor (5), air compressor machine (6); Described product N
2o reactor (5) is a closed type SBR, is provided with sealing cover (5.9) and water seal arrangement (5.12), N
2o collection tube (5.13) and adding of agent mouth (5.11), in reactor, be provided with agitator (5.10) and stirring arm (5.8), reactor wall is provided with thief hole hold concurrently mud discharging mouth (5.2), rising pipe (5.7), DO probe (5.3) and pH pop one's head in (5.5), dissolved oxygen meter (5.4) is connected respectively corresponding probe with pH meter (5.6), and reactor bottom is provided with blow-down pipe (5.1); Former water tank (1) is by intake pump (2) and product N
2o reactor (5) is connected; Short distance nitration liquid water tank (3) is by short distance nitration liquid pump (4) and product N
2o reactor (5) is connected;
It is characterized in that comprising the following steps:
1) get the excess sludge of municipal sewage plant's Biological Phosphorus Removal System, join in reactor, adding rear activated sludge concentration MLSS is 1500-3000mg/L;
2) fill phase stirs in water inlet, the 5%-25% that water inlet volume is reactor volume;
3) anaerobism agitation phases working time is 1-2h;
4) enter the short distance nitration liquid stage and stir simultaneously, enter short distance nitration liquid and amass the 5-25% into reactor volume; Make nitrite nitrogen concentration in reactor increase to 15-40mg/L;
5) the anoxia stirring stage running time is 3-8h, and by on-line monitoring pH value, in the time that pH value starts to transfer decline to by rising, stops stirring;
6) aeration phase working time is 0.5-1.5h, and controlling DO concentration is 1.0-2.0mg/L;
7) discharge excess sludge is 3-10d by adjusting sludge volume Controlling System sludge age;
8) sedimentation time is 0.5-1.0h;
9) be 0.5-3.0h idle mixing time.
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|---|---|---|---|
| CN201310357185.7A CN103408141B (en) | 2013-08-16 | 2013-08-16 | Device for improving N2O production in sewage treatment and control method thereof |
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|---|---|---|---|
| CN201310357185.7A CN103408141B (en) | 2013-08-16 | 2013-08-16 | Device for improving N2O production in sewage treatment and control method thereof |
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| CN103408141A CN103408141A (en) | 2013-11-27 |
| CN103408141B true CN103408141B (en) | 2014-09-24 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103739086B (en) * | 2013-12-28 | 2016-01-20 | 北京工业大学 | One realizes N in sludge-digestion liquid short distance nitration process 2o produces and the method utilized |
| CN103922469B (en) * | 2014-04-08 | 2016-01-13 | 北京工业大学 | N in a kind of half short distance nitration/Anammox sewage water denitrification process 2the collection device that O produces and method |
| CN104111310B (en) * | 2014-07-03 | 2016-01-20 | 同济大学 | The nitrated processing procedure N of a kind of saprobe 2o yield meter metering method |
| CN106673378A (en) * | 2017-03-06 | 2017-05-17 | 河南师范大学 | Biological sewage denitrification method and device capable of enhancing N2O generation and recycling |
| CN107954515A (en) * | 2017-11-08 | 2018-04-24 | 河南师范大学 | The combination unit and its operation method of a kind of sewage purification, Treatment of Sludge and energy recovery |
| CN109912132B (en) * | 2019-04-17 | 2022-01-18 | 扬州大学 | Realization of N by regulating and controlling dissolved oxygen2Real-time control device for O decrement and using method thereof |
| CN110054288A (en) * | 2019-05-22 | 2019-07-26 | 中国市政工程华北设计研究总院有限公司 | A method of using fruit juice waste liquid as sewage treatment plant's supplementary carbon source enhanced biological nitrogen removal |
| CN112320940B (en) * | 2020-10-21 | 2023-03-14 | 西安建筑科技大学 | N production by enrichment of membrane contactor 2 Device and method for O denitrifying bacteria |
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|---|---|---|---|---|
| KR100311986B1 (en) * | 1998-10-01 | 2002-02-19 | 장기훈 | Method for treating garbage and sludge simultaneously |
| CN1646209A (en) * | 2002-04-09 | 2005-07-27 | 犹德有限公司 | Denitrification method |
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Effective date of registration: 20210309 Address after: 100102 808, room 801, 8 / F, building 18, District 7, Wangjing East Garden, Chaoyang District, Beijing Patentee after: BEIJING ENTERPRISES WATER (CHINA) INVESTMENT Co.,Ltd. Address before: 100124 No. 100 Chaoyang District Ping Tian Park, Beijing Patentee before: Beijing University of Technology |
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