CN104829066A - Integral process and system for high-efficiency decarbonizing, nitrogen removing and phosphorus removing - Google Patents
Integral process and system for high-efficiency decarbonizing, nitrogen removing and phosphorus removing Download PDFInfo
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Abstract
The invention belongs to the technical field of sewage treatment and particularly relates to a process and a system for high-efficiency decarbonizing, nitrogen removing and phosphorus removing for sewage treatment. The process and the system are mainly used for treatment of high-concentration rural domestic wastewater and industrial wastewater and especially applicable to treatment of high-COD (chemical oxygen demand) high-ammonia-nitrogen domestic sewage or industrial wastewater. The process includes multi-influent aeration, primary sedimentation, oxygen-deficient treatment, aerobic treatment and secondary sedimentation, integral construction is realized, and accordingly floor space is further reduced, and investment cost is saved. By means of scientific distribution of water feeding points and water feeding quantity and reasonability and thoroughness in utilization of carbon sources, a favorable living environment is provided for denitrifying bacteria, nitrobacteria, polyphosphate accumulating bacteria and the like, and efficiency in decarbonizing, nitrogen removing and phosphorus removing is improved.
Description
Technical field
The invention belongs to technical field of sewage, be specifically related to a kind of integrated high-efficiency decarburization denitrification dephosphorization technique of disposing of sewage and system, mainly for the treatment of domestic sewage of villages and small towns and the trade effluent of high density, the sanitary sewage of especially high COD, high ammonia nitrogen or trade effluent.
Background technology
In recent decades, along with developing rapidly of China's economy, the quickening of urbanization process, Urban Water Shortage Problem of Cities becomes increasingly conspicuous, and lack of water scope is also expanding year by year, and shortage of water resources problem is extremely urgent.But, if the sanitary sewage that discharges of city and trade effluent is unprocessed or process is not up to standard just enters natural water, the pollution that surface water and groundwater is subject in various degree can be caused, and the key solving water shortage problem is just to solve water pollution problem.
Usual sanitary sewage mainly containing a large amount of suspended solids, can chemistry or biodegradable solvability or colloidal dispersions organism (characterizing with COD and BOD), nitrogenous compound (comprising ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and organonitrogen), phosphoric acid salt, k-na salt, bacterium class biological group etc.If do not add process or degree for the treatment of not enough and enter natural water body, just the accumulation of body eutrophication and toxicity can be caused, especially when the water that nitrogen and phosphorus content is higher enters nature, easily cause the eutrophication of water body, discharge the foul gas such as ammonia, hydrogen sulfide, cause the deterioration of water quality, and contaminate environment.
Therefore, the technological design of municipal sewage plant must from the function for the purpose of single organics removal to the functional shift of advanced nitrogen dephosphorization, and its reform course is the assembled technological from traditional Activated Sludge Process to aerobic, anaerobism and anoxic.But traditional denitrification dephosphorization technique ubiquity technical process is longer, the shortcomings such as floor space is large, initial cost is high, fluctuation of service." urban wastewater treatment firm pollutant emission standard " (GB18918-2002) that China formulates proposes comparatively strict requirement to nitrogen, phosphorus, newly-built town sewage plant also must consider the problem of nitrogen phosphorus emission compliance, some Sewage Plant run also are being transformed, and strengthen its denitrogenation dephosphorizing function.Therefore, become today of focus at the denitrogenation dephosphorizing of water body, high-efficient denitrification and dephosphorization systematic research exploitation also just becomes the most important thing of dealing with problems.
Along with the quickening of China's Development of China's Urbanization, resident living quantity of wastewater effluent increases severely, and town sewage has become the important source of pollution of Regional Water Environment.And the auxiliary facility of the most of middle-size and small-size urban wastewater treatment of China imperfection, as little in the water yield, dispersity is high domestic sewage in rural areas, breeding wastewater etc. directly enter water body, and body eutrophication can be made to aggravate.In view of Small Urban point-source pollution and water technology thereof fall behind, lack the features such as professional, level of management are low, urgently easy, the high-efficient denitrification and dephosphorization technique that is suitable for different scales, different quality of a kind of operational administrative.
Summary of the invention
The object of the invention is to provide a kind of integrated high-efficiency decarburization denitrification dephosphorization technique of disposing of sewage and system, its domestic sewage of villages and small towns mainly for the treatment of high density and trade effluent, the sanitary sewage of especially high COD, high ammonia nitrogen or trade effluent.
For achieving the above object, the present invention adopts following technical scheme:
A kind of integrated high-efficiency decarburization denitrification dephosphorization technique, it comprises the following steps:
1) pending sewage is introduced grid equalizing tank;
2) sewage in grid equalizing tank is divided into two-way, the sewage accounting for sewage total amount 50-80% enters aeration tank as the first via, after the aeration of aeration tank, enter the first settling tank carry out mud-water separation, the supernatant liquor of the first settling tank enters anoxic pond, the sludge part of the first settling tank is back to aeration tank with thinking that aeration tank provides bacterial classification, and remaining mud enters follow-up sludge treating system; The sewage accounting for sewage total amount 20-50% then enters anoxic pond as the second tunnel, for denitrification denitrogenation provides carbon source;
3) sewage after the process of anoxic pond denitrification enters Aerobic Pond and carries out Air Exposure, removes COD and ammonia nitrogen further;
4) mixed solution in Aerobic Pond is divided into two-way, the first via is back to anoxic pond and carries out denitrification process, control of reflux ratio is the clearance that the 100-200%(of flooding quantity so both ensure that total nitrogen, and unlikely backflow too much causes energy wastage and destroys anaerobic environment again); Second tunnel enters the second settling tank and carries out mud-water separation, the supernatant liquor qualified discharge of the second settling tank, and a mud part for the second settling tank is back to anoxic pond, and another part mud enters follow-up sludge treating system;
5) mud in sludge treating system is transported after thickening.
Wherein, aeration tank hydraulic detention time is 2-4 hour, and anoxic pond hydraulic detention time is 2-4 hour, and Aerobic Pond hydraulic detention time is 8-12 hour.In aeration tank, sludge concentration is 3800-4200 mg/litre, and anoxic pond and Aerobic Pond sludge concentration are 3000-3500 mg/litre.The sludge reflux rate of the first settling tank, the second settling tank is 50-100%, the surface load of the first settling tank, the second settling tank be 0.7-1.0 cubic meter/square metre hour.
Adopt above-mentioned technique to carry out a system for integrated high-efficiency decarburization denitrogenation dephosphorizing, it comprises sludge treating system and the grid equalizing tank connected in turn, aeration tank, the first settling tank, anoxic pond, Aerobic Pond and the second settling tank; The upper end of described anoxic pond is also connected with the outlet of grid equalizing tank, and the upper end of described Aerobic Pond is also connected with the upper end of anoxic pond; The pipeline of described first settling tank outlet at bottom is divided into two branch roads, and one of them is connected with the bottom of aeration tank, and another is connected with sludge treating system; The pipeline of described second settling tank outlet at bottom is divided into two branch roads, and one of them is connected with the bottom of anoxic pond, and another is connected with sludge treating system.
Concrete, be provided with the first airduct be connected with the first gas blower bottom described aeration tank, bottom described Aerobic Pond, be provided with the second airduct be connected with the second gas blower, in described anoxic pond, be provided with the first agitator and the second agitator.
In Sewage treatment systems of the present invention, adopt two mud method, aeration tank+settling tank is mainly used in removing majority of organic pollutants in the water inlet of this road, for subsequent disposal lightens the load; Can according to influent quality situation, properly distributed flooding quantity, the removal for total nitrogen provides sufficient carbon source, can not affect again the nitrification of nitrifier because influent COD is too high simultaneously; Resistance to overload shock, stable effluent quality; Convenient operation and management; My Perspective On The Co-building, saves floor occupying area.
Compared to the prior art, tool of the present invention has the following advantages:
1, the present invention is applicable to different scales, high COD, the town domestic sewage of high ammonia nitrogen and the process of trade effluent, solves high COD, the town domestic sewage of high ammonia nitrogen, the efficient decarburization Denitrogenation of trade effluent.Present system has the plurality of advantages such as cost of investment is low, floor space is little, treatment effect is good, resistance to overload shock, management maintenance are easy, climate impact is little, decarburization denitrification effect is good.Multipoint water feeding aeration+primary sedimentation+anoxic+aerobic+secondary sedimentation in the present invention, can adopt My Perspective On The Co-building, reduce floor space further, cost of reducing investment outlay.
2, adopt distribution water entry position and the flooding quantity of science in the present invention, rationally and make full use of carbon source, for denitrifying bacteria, nitrifier, polyP bacteria etc. provide good living environment, improve the efficiency of decarburization and denitrogenation dephosphorizing.
3, in the present invention, aeration tank+settling tank, anoxic pond+Aerobic Pond+settling tank, adopt two mud method, the two has independently sludge return pipe, the flora division of labor is clear and definite, mutually isolated, ensure that the Biochemistry Reaction System of respective different microorganisms and good pollutant removal.Wherein, be mainly heterotrophic bacterium in aeration tank, microorganism active is good, has very strong adsorptive power, and after precipitation, can remove a large amount of organic pollutants, decarburization efficiency is high; Anoxic pond+Aerobic Pond forms A/O technique, adds the properly distributed of flooding quantity, for denitrification denitrogenation and dephosphorization provide carbon source, not only removes total nitrogen effective, and can further degradable organic pollutant.
4, in the present invention, each reaction tank and settling tank My Perspective On The Co-building, floor space is little, less investment, is applicable to the Industrial Wastewater Treatment of the industries such as intensive town sewage, new rural planning sanitary sewage and leather, has broad application prospects.
Accompanying drawing explanation
Fig. 1 is integrated high-efficiency decarburization denitrification dephosphorization system schematic diagram of the present invention.
Embodiment
Do to introduce in detail further to technical scheme of the present invention below in conjunction with embodiment, but protection scope of the present invention is not limited thereto.
embodiment 1
A kind of integrated high-efficiency decarburization denitrification dephosphorization technique, it comprises the following steps:
1) pending sewage is introduced grid equalizing tank;
2) sewage in grid equalizing tank is divided into two-way, the sewage accounting for sewage total amount 70% enters aeration tank as the first via, after the aeration of aeration tank, enter the first settling tank carry out mud-water separation, the supernatant liquor of the first settling tank enters anoxic pond, the sludge part of the first settling tank is back to aeration tank with thinking that aeration tank provides bacterial classification, and remaining mud enters follow-up sludge treating system; The sewage accounting for sewage total amount 30% then enters anoxic pond as the second tunnel, for denitrification denitrogenation provides carbon source;
3) sewage after the process of anoxic pond denitrification enters Aerobic Pond and carries out Air Exposure, removes COD and ammonia nitrogen further;
4) mixed solution in Aerobic Pond is divided into two-way, and the first via is back to anoxic pond and carries out denitrification process, and control of reflux ratio is 150% of flooding quantity; Second tunnel enters the second settling tank and carries out mud-water separation, the supernatant liquor qualified discharge of the second settling tank, and a mud part for the second settling tank is back to anoxic pond, and another part mud enters follow-up sludge treating system;
5) mud in sludge treating system is transported after thickening;
Wherein, aeration tank hydraulic detention time is 3 hours, and anoxic pond hydraulic detention time is 3 hours, and Aerobic Pond hydraulic detention time is 10 hours.In aeration tank, sludge concentration is 4000 mg/litre, and anoxic pond and Aerobic Pond sludge concentration are 3200 mg/litre.The sludge reflux rate of the first settling tank, the second settling tank is 80%, and the surface load of the first settling tank, the second settling tank is 0.8 cubic metre/square metre hour.
As shown in Figure 1, adopt above-mentioned technique to carry out a system for integrated high-efficiency decarburization denitrogenation dephosphorizing, it comprises sludge treating system 7 and the grid equalizing tank 1 connected in turn, aeration tank 2, first settling tank 3, anoxic pond 4, Aerobic Pond 5 and the second settling tank 6; The upper end of described anoxic pond 4 is also connected with the outlet of grid equalizing tank 1, and the upper end of described Aerobic Pond 5 is also connected with the upper end of anoxic pond 4; The pipeline of described first settling tank 3 outlet at bottom is divided into two branch roads, and one of them is connected with the bottom of aeration tank 2, and another is connected with sludge treating system 7; The pipeline of described second settling tank 6 outlet at bottom is divided into two branch roads, and one of them is connected with the bottom of anoxic pond 4, and another is connected with sludge treating system 7.Be provided with the first airduct 9 be connected with the first gas blower 10 bottom described aeration tank 2, be provided with the second airduct 14 be connected with the second gas blower 15 bottom described Aerobic Pond 5, the two ends in described anoxic pond 4 are provided with the first agitator 12 and the second agitator 13.
In Fig. 1, band arrow solid line is water (flow) direction line, and band arrow dotted line is mud flow line.Treatment sewage enters in grid equalizing tank 1, after the first pump 8 promotes, is divided into two-way.The first via enters in aeration tank 2 through pipeline, air is blasted in aeration tank 2 by the first airduct 9 and carries out aeration (in this pond, heterotrophic bacterium is preponderated by the first gas blower 10, there is very strong adsorptive power, under heterotrophic microorganism effect, organism is effectively removed), enter the first settling tank 3 through piping again after aeration and carry out mud-water separation, supernatant liquor in first settling tank 3 enters anoxic pond 4 through pipeline, precipitating sludge in first settling tank 3 promotes rear portion through the second pump 11 and is back in aeration tank 2, and another part enters sludge treating system 7 through pipeline.Second tunnel directly enters in anoxic pond 4 (for denitrification denitrogenation and dephosphorization provide carbon source through pipeline, again can degradable organic pollutant further), under the effect of the first agitator 12, second agitator 13, fully to mix denitrification effective for muddy water, then enter in Aerobic Pond 5 through pipeline.Air is blasted in Aerobic Pond 5 by the second airduct 14 and carries out aeration (sufficient nitration reaction) by the second gas blower 15, a mixed solution part in Aerobic Pond 5 promotes through the 3rd pump 16, flow in anoxic pond 4 along back of pipeline and carry out denitrification process, another part enters in settling tank 6 to carry out mud-water separation through pipeline.Supernatant liquor qualified discharge in settling tank 6, the precipitating sludge in settling tank 6 is under the effect of the 4th pump 17, and a part flow in anoxic pond 4 through back of pipeline, and another part enters sludge treating system 7 through pipeline.Enter precipitating sludge in sludge treating system 7 after thickening, carry out mud outward transport.
Connect the first blower fan 10 by the first airduct 9 in aeration tank 2 and carry out blast aeration, connect the second blower fan 15 by the second airduct 14 in Aerobic Pond 5 and carry out blast aeration.Here the first airduct 9 and the second airduct 14, first blower fan 10 and the second blower fan 15 all belong to equipment of the same race, but for different situations, model can be different.The liquid level of aeration tank 2, first settling tank 3, anoxic pond 4, Aerobic Pond 5, second settling tank 6 is arranged successively from high to low, and in pond, sewage all can realize gravity flow, save energy and power.Wherein, sludge treating system 7 is mainly used in the concentrated of excess sludge and dehydration, transports, is prior art, so repeat no more through shore pipe.
For sanitary sewage (the former water COD 516-612mg/L of high density, ammonia nitrogen 54.1-68.8mg/L, SS 80-160mg/L), use above-mentioned technique to process, biochemistry pool (i.e. aeration tank, anoxic pond and Aerobic Pond) total hrt remains on 12-15h, and water outlet COD is stabilized in below 50mg/L, ammonia nitrogen is at below 2mg/L, SS, at below 9mg/L, meets the one-level A standard in GB18918-2002 " urban wastewater treatment firm pollutant emission standard ", and stable.
For leather-making waste water, after anaerobic treatment, COD is at 420-725mg/L, and ammonia nitrogen is at 49.3-68.2mg/L, SS is at 215-346mg/L, use above-mentioned technique to process further, biochemistry pool (i.e. aeration tank, anoxic pond and Aerobic Pond) total hrt is about 18h, and water outlet COD is stabilized in 67-94mg/L, ammonia nitrogen is at 9.2-14.5mg/L, SS, at 9-23mg/L, meets the primary standard in " integrated wastewater discharge standard " (GB8978-1996), and stable.
Claims (4)
1. an integrated high-efficiency decarburization denitrification dephosphorization technique, is characterized in that, comprises the following steps:
1) pending sewage is introduced grid equalizing tank;
2) sewage in grid equalizing tank is divided into two-way, the sewage accounting for sewage total amount 50-80% enters aeration tank as the first via, after the aeration of aeration tank, enter the first settling tank carry out mud-water separation, the supernatant liquor of the first settling tank enters anoxic pond, the sludge part of the first settling tank is back to aeration tank, and remaining mud enters follow-up sludge treating system; The sewage accounting for sewage total amount 20-50% then enters anoxic pond as the second tunnel, for denitrification denitrogenation provides carbon source;
3) sewage after the process of anoxic pond denitrification enters Aerobic Pond and carries out Air Exposure, removes COD and ammonia nitrogen further;
4) mixed solution in Aerobic Pond is divided into two-way, and the first via is back to anoxic pond and carries out denitrification process, and control of reflux ratio is the 100-200% of flooding quantity; Second tunnel enters the second settling tank and carries out mud-water separation, the supernatant liquor qualified discharge of the second settling tank, and a mud part for the second settling tank is back to anoxic pond, and another part mud enters follow-up sludge treating system;
5) mud in sludge treating system is transported after thickening.
2. integrated high-efficiency decarburization denitrification dephosphorization technique as claimed in claim 1, it is characterized in that, aeration tank hydraulic detention time is 2-4 hour, and anoxic pond hydraulic detention time is 2-4 hour, and Aerobic Pond hydraulic detention time is 8-12 hour; In aeration tank, sludge concentration is 3800-4200 mg/litre, and anoxic pond and Aerobic Pond sludge concentration are 3000-3500 mg/litre; The sludge reflux rate of the first settling tank, the second settling tank is 50-100%, the surface load of the first settling tank, the second settling tank be 0.7-1.0 cubic meter/square metre hour.
3. the system adopting technique described in claim 1 to carry out integrated high-efficiency decarburization denitrogenation dephosphorizing, it is characterized in that, comprise sludge treating system and the grid equalizing tank connected in turn, aeration tank, the first settling tank, anoxic pond, Aerobic Pond and the second settling tank; The upper end of described anoxic pond is also connected with the outlet of grid equalizing tank, and the upper end of described Aerobic Pond is also connected with the upper end of anoxic pond; The pipeline of described first settling tank outlet at bottom is divided into two branch roads, and one of them is connected with the bottom of aeration tank, and another is connected with sludge treating system; The pipeline of described second settling tank outlet at bottom is divided into two branch roads, and one of them is connected with the bottom of anoxic pond, and another is connected with sludge treating system.
4. the system of integrated high-efficiency decarburization denitrogenation dephosphorizing as claimed in claim 3, it is characterized in that, the first airduct be connected with the first gas blower is provided with bottom described aeration tank, be provided with the second airduct be connected with the second gas blower bottom described Aerobic Pond, in described anoxic pond, be provided with the first agitator and the second agitator.
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| US7172699B1 (en) * | 2004-10-13 | 2007-02-06 | Eimco Water Technologies Llc | Energy efficient wastewater treatment for nitrogen and phosphorus removal |
| CN101723554A (en) * | 2009-12-31 | 2010-06-09 | 华南理工大学 | Chemical fertilizer waste water treatment method |
| CN103241904A (en) * | 2013-05-24 | 2013-08-14 | 郑州大学 | Multi-point water inlet aeration anoxic-aerobic high-efficient nitrogen and phosphorus removal method |
| CN204689726U (en) * | 2015-05-27 | 2015-10-07 | 郑州大学 | Integrated high-efficiency decarburization denitrification dephosphorization system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7172699B1 (en) * | 2004-10-13 | 2007-02-06 | Eimco Water Technologies Llc | Energy efficient wastewater treatment for nitrogen and phosphorus removal |
| CN101723554A (en) * | 2009-12-31 | 2010-06-09 | 华南理工大学 | Chemical fertilizer waste water treatment method |
| CN103241904A (en) * | 2013-05-24 | 2013-08-14 | 郑州大学 | Multi-point water inlet aeration anoxic-aerobic high-efficient nitrogen and phosphorus removal method |
| CN204689726U (en) * | 2015-05-27 | 2015-10-07 | 郑州大学 | Integrated high-efficiency decarburization denitrification dephosphorization system |
Non-Patent Citations (1)
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| 胡亮等: "分点进水高效除磷脱氮工艺工程应用研究", 《环境科技》 * |
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