CN104944701A - Method for enhancing sewage nitrogen and phosphorus removal and saving energy and reducing consumption based on pulse aeration - Google Patents
Method for enhancing sewage nitrogen and phosphorus removal and saving energy and reducing consumption based on pulse aeration Download PDFInfo
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Abstract
The invention discloses a method for enhancing sewage nitrogen and phosphorus removal and saving energy and reducing consumption based on pulse aeration. On the basis of a traditional A2O process, different galleries or areas of an aerobic zone are partitioned, a central control system in a sewage treatment plant is used for controlling an air blower, a pipeline and an air valve of an aerating system, the aerobic zone is subjected to pulse aeration, an area in the aerobic zone is always in the low dissolved oxygen state, DO is smaller than 0.5 mg/L, meanwhile, other areas normally aerate to be in high dissolved oxygen state, that is, DO is 2-3 mg/L, different areas of the aerobic zone are alternatively in the low dissolved oxygen state, the time that each area is in the low dissolved oxygen state in one cycle is t/n; t is an aerobic zone hydraulic retention time, and n refers to the number of the galleries or areas; the pulse cycle is an aerobic zone hydraulic retention time; after the aerobic zone is subjected to intermittent pulse aeration, an alternative aerobic-anoxic environment is realized, the denitrification is enhanced, and the sewage treatment effect and the water quality are improved.
Description
Technical field
The present invention relates to technical field of sewage, specifically based on intermission aeration strengthening sewage denitrification and dephosphorization and energy-saving and cost-reducing method.
Background technology
In sewage effluent, nitrogen phosphorus is the important nutrient causing body eutrophication.Along with being on the rise of China's body eutrophication problem, and the enforcement of new " town sewage plant pollutant emission standard " (GB18918-2002), the sewage denitrification and dephosphorization technology that research and development economical and efficient is stable, has become the technical need that water treatment field is badly in need of.Meanwhile, sewage work's operation energy consumption is higher, is that it runs major investment expense source; Aeration oxygen supply is again energy consumption main consumer, so reducing sewage work's aeration energy consumption is its energy-saving and cost-reducing key measures.
The technique that current sewage denitrification and dephosphorization mainly adopts biological nitrification and denitrification and biological chemistry dephosphorization based on anaerobic/anoxic/aerobic process to combine.Because China's sewage exists low-carbon-source feature, so effectively carbon source is relatively low in water inlet, be not enough to support effective denitrogenation dephosphorizing; And in traditional denitrification dephosphorization technique, there is denitrifying bacteria and polyP bacteria competition carbon source problem, denitrogenation and dephosphorization are difficult to reach optimum efficiency simultaneously.Biological denitrification process mainly comprises aerobic nitrification and anoxic denitrification.General biological denitrification process goes through Anoxic/Aerobic (AO) technique, also namely adopts Prepositive denitrification, and aerobic section nitrification liquid is back to anoxic section, utilizes carbon source in water inlet to carry out denitrification denitrogenation.The denitrification percent of tradition AO technique is subject to the control of mixed liquid recycle ratio and return sludge ratio, in order to reach higher denitrification percent, will improve reflux ratio.Adopting traditional AO technique, is 300% at mixed liquid recycle ratio, and return sludge ratio is under the condition of 100%, and do not consider the synthesis of cell Self substances, nitrogen removal rate reaches as high as about 80%.Continue to increase reflux ratio, nitrogen removal rate rises not obvious, and will increase from the dissolved oxygen that Aerobic Pond enters anoxic pond, thus consumes organic carbon source in water inlet, affects the efficiency of denitrification denitrogenation.
At present, intermission aeration is mainly used in controlling diaphragm in membrane bioreactor and pollutes, and there is not yet the research for sewage work's aeration control and report.
Summary of the invention
The object of the invention is for China's low-carbon-source sewage feature, in conjunction with the progress of nearest denitrogenation dephosphorizing theory, provide a kind of based on intermission aeration strengthening sewage denitrification and dephosphorization and energy-saving and cost-reducing sewage water treatment method.
The present invention adopts intermission aeration pattern to provide the strengthening sewage denitrification and dephosphorization technology of oxygen, by intermission aeration pattern, can intensified denitrification and dephosphorization efficiency, and sewage work's operation energy consumption can be reduced, particularly city and country dispersant type domestic wastewater process simultaneously.
Technical scheme of the present invention is: be mainly at traditional A based on intermission aeration strengthening sewage denitrification and dephosphorization and energy-saving and cost-reducing sewage water treatment method
2on the basis of O technique, different for aerobic zone gallery or region are carried out subregion, by the blower fan of sewage work's master control system to aerating system, the control of pipeline and air valve etc., intermission aeration is realized to aerobic zone, allowing in aerobic zone has a region to be in low dissolved oxygen state (DO < 0.5mg/L) all the time, and meanwhile the normal aeration in other regions is in high dissolved oxygen state (DO2-3mg/L).Wherein, aerobic zone different zones is alternately in low dissolved oxygen state, and the time that each region is in low dissolved oxygen state in one-period is t/n, t is aerobic zone hydraulic detention time, and n is aerobic zone gallery or number of regions, and the recurrence interval is aerobic zone hydraulic detention time.After intermittent pulse aeration is carried out to aerobic zone, aerobic zone will remain that a gallery or region are in low dissolved oxygen state (DO < 0.5mg/L), realize alternately Anoxic/Aerobic environment, intensified anti-nitrated effect, lifting sewage treatment effect and water quality.According to dissolved oxygen (DO), chemical oxygen demand (COD) (CODcr), total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH that each gallery in aerobic zone or region are all installed
3-N) etc. the achievement data in on-line checkingi instrument, carry out the control of intermission aeration amount, to reach stable production run effect.This technique can obtain good Nitrogen/Phosphorus Removal and reduce sewage disposal operation energy consumption cost.
The present invention is at traditional A
2o Process ba-sis carries out, Sewage Plant integrated artistic is made up of anaerobic/anoxic/aerobic/precipitate phase or is made up of hypoxic/anaerobic/aerobic/precipitate phase: flow into anaerobic zone (DO < 0.2mg/L) through pretreated sewage, polyP bacteria utilizes small molecules carbon source material and is stored as the biological process that release phosphorus occurs interior polymers, anaerobic zone water outlet enters oxygen-starved area (DO < 0.5mg/L) in turn and carries out denitrification, and then enter aerobic zone through high and low aerobic zone (high DO, 2-3mg/L that intermission aeration is formed; Low DO, < 0.5mg/L) there is process that is nitrated and picked-up phosphorus, the carrying out of synchronous nitration and denitrification will be of value in high and low dissolved oxygen district alternation procedure, sewage mixed solution finally by intermission aeration aerobic zone enters precipitate phase, supernatants after precipitation is discharged to natural water, after precipitation, sludge part is back to anaerobic zone, excess sludge in mud is discharged simultaneously enter sludge treating system carry out concentrating, dewater after outward transport carry out effective specific resistance to filtration.
In technique of the present invention, anaerobic stages mainly promotes that polyP bacteria etc. can accumulate the biochemical metabolism of the microorganism of interior polymers, makes full use of the small molecules organic carbon source that anaerobic hydrolysis produces, and accumulation is taken the photograph phosphorus for interior polymers in order to later stage denitrification and biology and needed to use.Technique anoxic phases mainly promotes that denitrifying bacteria carries out denitrification denitrogenation.Aerobic stage is nitrated and organics removal mainly.The second pond of precipitate phase mainly retains mud, and returned sluge is in main process, improves sludge concentration and improves sewage treating efficiency.
Gordian technique of the present invention is the improvement to aerobic stage operational mode, main employing intermission aeration pattern (being realized by the regulation and control of master control system, intake valve and pipeline after aerobic zone being carried out subregion), effectively can control oxygen-supplying amount, form high and low dissolved oxygen district, realize alternately Anoxic/Aerobic environment, strengthening aerobic stage synchronous nitration and denitrification.First, this intermission aeration pattern can conservative control oxygen-supplying amount, because heterotrophic bacterium and ammonia nitrifier have higher oxygen competitive capacity, so can suppress the activity of nitrite nitrifier, is conducive to realizing short-cut nitrification and denitrification.Secondly, by intermission aeration, strengthened denitrification, can reduce the quantity of reflux of follow-up mud mixed liquid, indirectly reduces sump pump operation energy consumption.Moreover, by controlling oxygen-supplying amount, the invalid utilization of carbon source material can be reduced, and strengthening is used in the denitrogenation dephosphorizing processes such as denitrification, the removal efficiency of enhanced sewage total nitrogen.Finally, by intermission aeration pattern, can efficiency of oxygen supply be improved, thus reduce aeration in sewage treatment energy consumption.
Accompanying drawing explanation
Fig. 1 is process for removing nitrogen and phosphor from sewage schema of the present invention.
Fig. 2 is intermission aeration schematic diagram of the present invention.
In Fig. 2, A, B, C, D make a living anti-pond, P
a, P
b, P
c, P
dfor air valve, a, b, c, d are on-line monitoring instrument (dissolved oxygen, chemical oxygen demand (COD), total nitrogen, total phosphorus, ammonia nitrogen etc.).
Embodiment
Embodiment 1:
As shown in Figure 1, sewage water treatment method of the present invention primarily of anaerobic/anoxic/aerobic/precipitate phase composition, or is made up of hypoxic/anaerobic/aerobic/precipitate phase; Flow into anaerobic zone through pretreated sewage, polyP bacteria etc. utilize small molecules carbon source material and are stored as interior polymers, and main generation discharges the biological processes such as phosphorus.Anaerobic zone water outlet enters oxygen-starved area in turn and carries out denitrification, and then enter intermission aeration aerobic zone and the processes such as nitrated and picked-up phosphorus occur, last sewage mixed solution flows into settling region.Supernatants after precipitation discharges treatment system to natural water; After precipitation, sludge part is back to anaerobic zone, realizes mud and experiences anaerobic-anoxic-oxic alternation procedure respectively, complete the removal to pollution substance each in sewage.Precipitating sludge part is discharged and is back to anaerobic zone, excess sludge enter sludge treating system carry out concentrating, dewater after outward transport carry out effective specific resistance to filtration.
As shown in Figure 2, if there are region A, B, C, D of 4 gallerys in Sewage Plant aerobic zone, aerobic zone hydraulic detention time 10h, existing by master control system (PLC) to the control of gas blower, pipeline and air valve, regulate the air input in each region, regulation and control intake valve P
amake region A be in low dissolved oxygen state, other three normal aerations in region maintain high dissolved oxygen state 2.5; Intake valve P is regulated and controled after 2.5h
awith P
bmake region B be in low dissolved oxygen state, its excess-three region is in high dissolved oxygen state; Complete the situation that region C, D are in low dissolved oxygen state successively, then get back to A and so circulate and repeatedly realize intermission aeration.Each gallery is provided with DO, CODcr, TN, TP, NH simultaneously
3the on-line checkingi instrument such as-N, can monitor its achievement data, it can be used as the foundation of process control, guarantee to run the efficient process of sewage and administration measure.
Claims (2)
1., based on intermission aeration strengthening sewage denitrification and dephosphorization and an energy-saving and cost-reducing method, it is characterized in that being carried out as follows: at traditional A
2on the basis of O technique, different for aerobic zone gallery or region are carried out subregion, by the blower fan of sewage work's master control system to aerating system, the control of pipeline and air valve etc., intermission aeration is carried out to aerobic zone, allowing in aerobic zone has a region to be in low dissolved oxygen state all the time, DO < 0.5mg/L, meanwhile the normal aeration in other regions is in high dissolved oxygen state DO2-3mg/L, aerobic zone different zones is alternately in low dissolved oxygen state, the time that each region is in low dissolved oxygen state in one-period is t/n, t is aerobic zone hydraulic detention time, n is aerobic zone gallery or number of regions, recurrence interval is aerobic zone hydraulic detention time, after intermittent pulse aeration is carried out in aerobic zone, realize alternately Anoxic/Aerobic environment, intensified anti-nitrated effect, lifting sewage treatment effect and water quality.
2. according to claim 1 based on intermission aeration strengthening sewage denitrification and dephosphorization and energy-saving and cost-reducing method, it is characterized in that dissolved oxygen (DO), chemical oxygen demand (COD) (CODcr), total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH are all installed in each gallery in aerobic zone or region
3-N) on-line checkingi instrument, and according to the achievement data in on-line checkingi instrument, carry out the control of intermission aeration amount.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107055949A (en) * | 2017-03-12 | 2017-08-18 | 云南滇清环境科技有限公司 | It is a kind of flexibly to switch the efficient low-consume Rubber Industrial Wastewater processing method and system of technique |
| CN109809563A (en) * | 2019-03-25 | 2019-05-28 | 张庆五 | A kind of sewage water treatment method |
| CN110040914A (en) * | 2019-05-20 | 2019-07-23 | 北京市高速公路交通工程有限公司 | A kind of sewage disposal device and treatment process for domestic sewage denitrifying-dephosphorizing |
| CN110127941A (en) * | 2019-05-20 | 2019-08-16 | 北京市高速公路交通工程有限公司 | A kind of biological and chemical method coupling denitrification dephosphorization technique and processing equipment |
| CN111170573A (en) * | 2020-01-16 | 2020-05-19 | 河海大学 | Method for treating sewage containing organic waste liquid |
| CN111470629A (en) * | 2020-04-17 | 2020-07-31 | 西安建筑科技大学 | Facultative active sludge sewage treatment method |
| CN112047575A (en) * | 2020-09-10 | 2020-12-08 | 江苏润誉环保设备科技有限公司 | Method for treating pyromellitic dianhydride production wastewater and special device |
| CN112997934A (en) * | 2021-03-18 | 2021-06-22 | 大连海洋大学 | Method for promoting reproductive capacity of parent stichopus japonicus |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107055949A (en) * | 2017-03-12 | 2017-08-18 | 云南滇清环境科技有限公司 | It is a kind of flexibly to switch the efficient low-consume Rubber Industrial Wastewater processing method and system of technique |
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| CN109809563A (en) * | 2019-03-25 | 2019-05-28 | 张庆五 | A kind of sewage water treatment method |
| CN110040914A (en) * | 2019-05-20 | 2019-07-23 | 北京市高速公路交通工程有限公司 | A kind of sewage disposal device and treatment process for domestic sewage denitrifying-dephosphorizing |
| CN110127941A (en) * | 2019-05-20 | 2019-08-16 | 北京市高速公路交通工程有限公司 | A kind of biological and chemical method coupling denitrification dephosphorization technique and processing equipment |
| CN111170573A (en) * | 2020-01-16 | 2020-05-19 | 河海大学 | Method for treating sewage containing organic waste liquid |
| CN111470629A (en) * | 2020-04-17 | 2020-07-31 | 西安建筑科技大学 | Facultative active sludge sewage treatment method |
| CN112047575A (en) * | 2020-09-10 | 2020-12-08 | 江苏润誉环保设备科技有限公司 | Method for treating pyromellitic dianhydride production wastewater and special device |
| CN112047575B (en) * | 2020-09-10 | 2022-06-24 | 江苏润誉环保设备科技有限公司 | Method for treating pyromellitic dianhydride production wastewater and special device |
| CN112997934A (en) * | 2021-03-18 | 2021-06-22 | 大连海洋大学 | Method for promoting reproductive capacity of parent stichopus japonicus |
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