CN103613193B - Divisional water feed type D-A<2>0 sewage treatment method - Google Patents
Divisional water feed type D-A<2>0 sewage treatment method Download PDFInfo
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- CN103613193B CN103613193B CN201310596065.2A CN201310596065A CN103613193B CN 103613193 B CN103613193 B CN 103613193B CN 201310596065 A CN201310596065 A CN 201310596065A CN 103613193 B CN103613193 B CN 103613193B
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Abstract
The invention provides a divisional water feed type D-A<2>0 sewage treatment method. According to the sewage treatment method, two independent phases of sludge/nitration liquid reflux systems are designed, when water is fed normally and phosphorus release and denitrification are maintained in one phase, and excessive phosphorus release and sufficient denitrification are performed due to excessive oxygen deficiency in the other phase at rest; phosphorus-accumulating bacteria in the system definitely absorb phosphorus in an aerobic zone due to the excessive phosphorus release of the phosphorus-accumulating bacteria in an anaerobic zone; ultimately, a remarkable phosphorus removal function of the system is realized by means of discharging residual sludge. By using the sewage treatment method, the problem that the efficiencies of denitrification and phosphorus removal are difficult to further enhance in an A<2>0 sewage treatment technology is solved; in addition, the quality of effluent treated by the treatment method is stabilized between the first class A criteria and surface water environment quality V standard.
Description
Technical field
The invention belongs to technical field of sewage, particularly relate to a kind of subregion inlet type D-A
2o sewage water treatment method.
Background technology
Existing A
2/ O sewage water treatment method, for be processed through anaerobic pond, anoxic pond and Aerobic Pond by sewage, finally carries out mud-water separation by settling tank, and the method effectively can not only remove the organism in sewage, also can synchronous denitrification dephosphorizing.
But, existing A
2also there is the problem that denitrogenation dephosphorizing efficiency is difficult to significantly promote further in/O, its major cause is: (1) exists the carbon source race problem of denitrogenation and dephosphorization; (2) there is microorganism to release phosphorus and inhale the lower problem of phosphorus ability.Achievement in research in the past shows, A
2in/O technique, the denitrification of anoxic section is the main path denitrogenated, and its key is whether there is sufficient carbon source in anoxic section; Meanwhile, polyP bacteria also needs easily biodegradable organics in picked-up anaerobism section to release phosphorus reaction, can in aerobic section excessive suction phosphorus and reach the object of dephosphorization.When water inlet in carbon source lack, namely water inlet for low C/N than time, A
2/ O technique denitrogenation dephosphorizing carbon source race problem is particularly evident.From technical process, polyP bacteria almost consumes the organism of easily degrading into the overwhelming majority in water in the phosphorus effect of releasing of anaerobism section, thus anoxic section only surplus a small amount of at a slow speed or the organism of difficult degradation be difficult to meet denitrification denitrogenation effect and cause denitrification effect poor.From same anaerobism (anoxic) section, denitrifying bacteria has precedence over polyP bacteria and utilizes organic carbon source to carry out denitrogenation, thus causes polyP bacteria to release the reduction of phosphorus effect, and its result must cause the suction phosphorus effect of aerobic section not remarkable.Therefore, existing A
2the carbon source race problem of/O technique becomes the restrictive factor of this technique denitrogenation dephosphorizing.
In addition, existing A
2/ O technique denitrogenation dephosphorizing and reflux ratio closely related.Too low reflux ratio difficulty has desirable denitrogenation dephosphorizing effect, but too high reflux ratio also detests (lacking) oxygen section DO excessive concentration because of causing and difficulty has higher denitrification effect and releases phosphorus ability.Therefore, existing A
2/ O technique all controls mud, muddy water mixed solution reflux ratio in lower value, and it releases phosphorus and suction phosphorus ability is less.
Summary of the invention
The object of the present invention is to provide a kind of subregion inlet type D-A
2o sewage water treatment method, is intended to solve existing A
2the problem of denitrogenation dephosphorizing limited efficacy in O sewage water treatment method.
The present invention is achieved in that a kind of subregion inlet type D-A
2o sewage water treatment method, comprises the following steps:
(1) untreated sewage is injected into respectively in the first anaerobic pond, the first anoxic pond, the second anaerobic pond and the second anoxic pond, be communicated with in described first anaerobic pond with the first anoxic pond, be communicated with in the second anaerobic pond with the second anoxic pond, first anoxic pond and the second anoxic pond are communicated with Aerobic Pond, described Aerobic Pond is communicated with secondary sedimentation basins;
(2) when subregion water inlet is to the first anaerobic pond and the first anoxic pond, the part of contaminated water in described Aerobic Pond is back in the first anoxic pond, the partial sludge in described secondary sedimentation basins is back in the first anaerobic pond; Stop the second anaerobic pond and the water inlet of the second anoxic pond, described second anaerobic pond and the second anoxic pond are left standstill for some time;
(3) when subregion water inlet is to the second anaerobic pond and the second anoxic pond, the part of contaminated water in described Aerobic Pond is back in the second anoxic pond, the partial sludge in described secondary sedimentation basins is back in the second anaerobic pond; Stop the first anaerobic pond and the water inlet of the first anoxic pond, stop the reflux operation of the first anoxic pond and the first anaerobic pond simultaneously; And after the first anaerobic pond and the first anoxic pond leave standstill for some time, stop the water inlet of the second anoxic pond and the second anaerobic pond and reflux operation and enter step (2).
Preferably, in step (1), described untreated sewage is injected into the ratio of the amount of the first anaerobic pond and the first anoxic pond for (7 ~ 9): (1 ~ 3); Described untreated sewage is injected into the ratio of the amount of the second anaerobic pond and the second anoxic pond for (7 ~ 9): (1 ~ 3).
Preferably, in described Aerobic Pond, sewage backflow is 150 ~ 300% to the reflux ratio in the first anoxic pond or the second anoxic pond, and in described Aerobic Pond, sludge concentration MLSS is 3500 ~ 4500mg/L.
Preferably, in described secondary sedimentation basins, sludge reflux is 50 ~ 150% to the reflux ratio in the first anaerobic pond or the second anaerobic pond, and in described secondary sedimentation basins, returned sluge concentration MLSS is 4000 ~ 6800mg/L.
Preferably, the partial sludge in described secondary sedimentation basins carries out Keep agitation to the first anaerobic pond or the second anaerobic pond while being back in the first anaerobic pond or the second anaerobic pond.
Preferably, the part of contaminated water in described Aerobic Pond carries out Keep agitation to the first anoxic pond or the second anoxic pond while being back in the first anoxic pond or the second anoxic pond.
Preferably, described in step (2), described in the time of repose of the second anaerobic pond and the second anoxic pond and step (3), the time of repose of the first anaerobic pond and the first anoxic pond is 1 ~ 4h.
The present invention overcomes the deficiencies in the prior art, provides a kind of subregion inlet type D-A
2o sewage water treatment method, by designing independent two-phase mud/nitrification liquid return-flow system, wherein a phase is normally intake and while keeping releasing phosphorus and denitrogenation, be in the quiet excessive anoxic of a phase factor of having a rest and carry out the phosphorus effect of releasing of excess and sufficient denitrogenation, guarantee that the phosphorus effect of releasing of system anaerobism section polyP bacteria excess must cause polyP bacteria to inhale phosphorus in the excess of aerobic section, finally to discharge the form of excess sludge and the more significant dephosphorization effect of the system that realizes.In the present invention, also determine that untreated sewage is injected into the control of the ratio of the amount between anaerobic pond and anoxic pond, effectively can avoid the not high problem of denitrogenation dephosphorizing efficiency that system causes because carbon source is not enough.In addition, in the present invention, the return sludge ratio of secondary sedimentation basins and the sewage backflow comparison of Aerobic Pond denitrogenation dephosphorizing efficiency of the present invention have considerable influence.
Compare the shortcoming and defect with prior art, the present invention has following beneficial effect: instant invention overcomes A
2in O sewage treatment process, denitrogenation dephosphorizing efficiency is difficult to the problem significantly promoted further, and the stable effluent quality after process of the present invention is between one-level A mark to surface water environment quality V class.
Accompanying drawing explanation
Fig. 1 is subregion inlet type D-A of the present invention
2the process flow sheet of O sewage water treatment method one embodiment; Wherein, 1 is the first anaerobic pond, and 2 is the first anoxic pond, and 3 is the second anaerobic pond, and 4 is the second anoxic pond, and 5 is Aerobic Pond, and 6 is secondary sedimentation basins; A1 and A2 is the input stream of untreated sewage, B1 and B2 is nitrify water reflow line, C1 and C2 is sludge reflux stream, and D is the water outlet stream of secondary sedimentation basins, and F is the mud discharging stream of secondary sedimentation basins.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In embodiments of the present invention, a kind of subregion inlet type D-A
2o sewage water treatment method, comprises the following steps:
(1) untreated sewage is injected into respectively in the first anaerobic pond 1, first anoxic pond 2, second anaerobic pond 3 and the second anoxic pond 4, be communicated with in described first anaerobic pond 1 with the first anoxic pond 2, be communicated with in the second anaerobic pond 3 with the second anoxic pond 4, first anoxic pond 2 and the second anoxic pond 4 are communicated with Aerobic Pond 5, described Aerobic Pond 5 is communicated with secondary sedimentation basins;
(2) when subregion water inlet is to the first anaerobic pond and the first anoxic pond, the part of contaminated water in described Aerobic Pond 5 is back in the first anoxic pond 2, the partial sludge in described secondary sedimentation basins is back in the first anaerobic pond 1; Stop the second anaerobic pond and the water inlet of the second anoxic pond, described second anaerobic pond 3 and the second anoxic pond 4 are left standstill for some time;
(3) when subregion water inlet is to the second anaerobic pond and the second anoxic pond, the part of contaminated water in described Aerobic Pond 5 is back in the second anoxic pond 4, the partial sludge in described secondary sedimentation basins is back in the second anaerobic pond 3; Stop the first anaerobic pond and the water inlet of the first anoxic pond, stop the water inlet to the first anoxic pond 2, first anaerobic pond 1 and reflux operation simultaneously, and after the first anaerobic pond 1 and the first anoxic pond 2 leave standstill for some time, stop the water inlet of the second anoxic pond 4 and the second anaerobic pond 3 and reflux operation and enter step (2).
More specifically, while the partial sludge in secondary sedimentation basins is back in the first anaerobic pond 1 or the second anaerobic pond 3, Keep agitation is carried out to the first anaerobic pond 1 or the second anaerobic pond 3.While part of contaminated water in Aerobic Pond 5 is back in the first anoxic pond 2 or the second anoxic pond 4, Keep agitation is carried out to the first anoxic pond 2 or the second anoxic pond 4.Stirring makes sewage or muddy water mix, and is more conducive to the growth of polyP bacteria and denitrifying bacteria, improves the effect of dephosphorization denitrogenation.
In actual application of the present invention, mainly through devising independent two-phase mud/nitrification liquid return-flow system, wherein, in step (2), first anaerobic pond 1, first anoxic pond 2, Aerobic Pond 5 and secondary sedimentation basins 6 are first-phase mud/nitrification liquid return-flow system, the input stream A1 controlling untreated sewage is that the first anaerobic pond 1 and the first anoxic pond 2 inject untreated sewage, control nitrify water reflow line B1 to reflux nitrification liquid to the first anoxic pond 2, control sludge reflux stream C1 to the first anaerobic pond 1 returned sluge, and second-phase mud/nitrification liquid return-flow system is in static condition, and in step (3), second anaerobic pond 3 and the second anoxic pond 4, Aerobic Pond 5 and secondary sedimentation basins are formed not only but also second-phase mud/nitrification liquid return-flow system, the input stream A2 controlling untreated sewage is that the first anaerobic pond 3 and the first anoxic pond 4 inject untreated sewage, control nitrify water reflow line B2 to reflux nitrification liquid to the first anoxic pond 4, control sludge reflux stream C2 to the first anaerobic pond 3 returned sluge now, the second anaerobic pond 3 and the second anoxic pond 4 are in static condition.
In the present invention, such as, when first-phase mud/nitrification liquid return-flow system work, in the first anaerobic pond 1 that untreated sewage flow to first-phase mud/nitrification liquid return-flow system with certain proportion respectively through constant flow pump and the first anoxic pond 2, new injection sewage again can with partly newly injecting sewage and entering the first anoxic pond 2 from the backflow sewage of Aerobic Pond 5 together with the sewage that goes out to flow that the returned sluge from secondary sedimentation basins enters in the first anaerobic pond 1, first anaerobic pond 1; In addition, the mud being back to the first anaerobic pond 1 in secondary sedimentation basins stirs after abundant mixing biochemical reaction through the first anaerobic pond 1 and the first anoxic pond 2, and muddy water mixed solution flow to Aerobic Pond 5; A part of mixed-liquor return to the first anoxic pond 2 of Aerobic Pond 5, another part is gone out to flow in secondary sedimentation basins 6 by the overflow weir of Aerobic Pond 5 and carries out mud-water separation, supernatant liquor is flowed out by the effluent weir of secondary sedimentation basins 6, and sludge part is back to the first anaerobic pond 1, outside excess sludge discharge system.The nitrification liquid refluxed with Aerobic Pond 5, secondary sedimentation basins 6, mud connect to stir at stirrer to be made active sludge microorganism fully contact with the pollutent matrix in sewage and organic matter degradation, denitrogenation occurs and releases phosphorus reaction, and the muddy water mixed solution of the first anoxic pond 2 flow to Aerobic Pond 5 and carries out suction phosphorus reaction.When system one is run with above-mentioned running status, another phase is then in quiet state of having a rest, whole process of the test, and the alternate run of first, second phase mud/nitrification liquid return-flow system achieves the process of pollutent and dirty water purification.More specifically, first, second phase mud/nitrification liquid return-flow system replaces once at interval of 1 ~ 4h in the present invention.The result of first, second phase mud/nitrification liquid return-flow system alternate run mode is must guarantee system wherein a phase is normally intake and keeps releasing phosphorus and denitrogenation while, is in the quiet excessive anoxic of a phase factor of having a rest and carries out the phosphorus effect of releasing of excess and sufficient denitrogenation.The phosphorus effect of releasing of anaerobism section polyP bacteria excess must cause polyP bacteria to inhale phosphorus in the excess of aerobic section, finally to discharge the form of excess sludge and the more significant dephosphorization effect of the system that realizes.
More specifically, in order to improve the effect of denitrogenating dephosphorization in sewage further, in embodiments of the present invention, in above-mentioned steps (1), described untreated sewage is injected into the ratio of the amount of the first anaerobic pond 1 and the first anoxic pond 2 for (7 ~ 9): (1 ~ 3); Described untreated sewage is injected into the ratio of the amount of the second anaerobic pond 3 and the second anoxic pond 4 for (7 ~ 9): (1 ~ 3).
In actual application of the present invention, adopt from A
2anaerobic pond and the anoxic pond of/O are intake by a certain percentage respectively, effectively can avoid the not high problem of denitrogenation dephosphorizing efficiency that system causes because carbon source is not enough.
More specifically, in order to can better to the control of dephosphorization efficiencies of nitrogen removal in sewage, in embodiments of the present invention, in described Aerobic Pond 5, sewage backflow is 150 ~ 300% to the reflux ratio in the first anoxic pond 2 or the second anoxic pond 4, and in Aerobic Pond 5, sludge concentration MLSS is 3500 ~ 4500mg/L; In described secondary sedimentation basins 6, sludge reflux is 50 ~ 150% to the reflux ratio in the first anaerobic pond 1 or the second anaerobic pond 3, and returned sluge concentration MLSS is 4000 ~ 6800mg/L.
In order to better prove the effect that the present invention denitrogenates the dephosphorization had in sewage treatment process, the present invention carries out following test:
Lab scale test water adopts glucose, peptone, anhydrous sodium acetate, potassium primary phosphate, ammonia chloride, sodium bicarbonate etc. to form with tap water human configuration, in order to simulated domestic wastewater.
Test conditions: water temperature=15 ~ 22 DEG C; Anaerobic pond water inlet ratio=70 ~ 90%, anoxic pond water inlet ratio=10 ~ 30%; Hydraulic detention time HRT=8 ~ 11h; Return current ratio of the mixed liquid R=150 ~ 300%(Aerobic Pond 5 sludge concentration MLSS=3500 ~ 4500mg/L); Return sludge ratio r=50 ~ 150%(returned sluge concentration MLSS=4000 ~ 6800mg/L); Two-phase alternate run time T=1 ~ 4h.
Lab scale test-results refers to table 1:
Table 1 test-results
As shown in Table 1, marked between surface water environment quality V class at one-level A by the stable effluent quality after method process of the present invention.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a subregion inlet type D-A
2o sewage water treatment method, is characterized in that comprising the following steps;
(1) untreated sewage is injected into respectively in the first anaerobic pond, the first anoxic pond, the second anaerobic pond and the second anoxic pond, be communicated with in described first anaerobic pond with the first anoxic pond, be communicated with in the second anaerobic pond with the second anoxic pond, first anoxic pond and the second anoxic pond are communicated with Aerobic Pond, described Aerobic Pond is communicated with secondary sedimentation basins;
(2) when subregion water inlet is to the first anaerobic pond and the first anoxic pond, the part of contaminated water in described Aerobic Pond is back in the first anoxic pond, the partial sludge in described secondary sedimentation basins is back in the first anaerobic pond; Stop the second anaerobic pond and the water inlet of the second anoxic pond, described second anaerobic pond and the second anoxic pond are left standstill for some time;
(3) when subregion water inlet is to the second anaerobic pond and the second anoxic pond, the part of contaminated water in described Aerobic Pond is back in the second anoxic pond, the partial sludge in described secondary sedimentation basins is back in the second anaerobic pond; Stop the first anaerobic pond and the water inlet of the first anoxic pond, stop the reflux operation of the first anoxic pond and the first anaerobic pond simultaneously; And after the first anaerobic pond and the first anoxic pond leave standstill for some time, stop the water inlet of the second anoxic pond and the second anaerobic pond and reflux operation and enter step (2);
In step (1), described untreated sewage is injected into the ratio of the amount of the first anaerobic pond and the first anoxic pond for (7 ~ 9): (1 ~ 3); Described untreated sewage is injected into the ratio of the amount of the second anaerobic pond and the second anoxic pond for (7 ~ 9): (1 ~ 3).
2. subregion inlet type D-A as claimed in claim 1
2o sewage water treatment method, is characterized in that, in described Aerobic Pond, sewage backflow is 150 ~ 300% to the reflux ratio in the first anoxic pond or the second anoxic pond, and in described Aerobic Pond, sludge concentration MLSS is 3500 ~ 4500mg/L.
3. subregion inlet type D-A as claimed in claim 2
2o sewage water treatment method, is characterized in that, in described secondary sedimentation basins, sludge reflux is 50 ~ 150% to the reflux ratio in the first anaerobic pond or the second anaerobic pond, and in described secondary sedimentation basins, returned sluge concentration MLSS is 4000 ~ 6800mg/L.
4. subregion inlet type D-A as claimed in claim 3
2o sewage water treatment method, is characterized in that, the partial sludge in described secondary sedimentation basins carries out Keep agitation to the first anaerobic pond or the second anaerobic pond while being back in the first anaerobic pond or the second anaerobic pond.
5. subregion inlet type D-A as claimed in claim 4
2o sewage water treatment method, is characterized in that, the part of contaminated water in described Aerobic Pond carries out Keep agitation to the first anoxic pond or the second anoxic pond while being back in the first anoxic pond or the second anoxic pond.
6. as right will remove the subregion inlet type D-A as described in 4
2o sewage water treatment method, is characterized in that, described in step (2), described in the time of repose of the second anaerobic pond and the second anoxic pond and step (3), the time of repose of the first anaerobic pond and the first anoxic pond is 1 ~ 4h.
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| CN104355408A (en) * | 2014-11-11 | 2015-02-18 | 玉溪师范学院 | A2O (anaeroxic-anoxic-oxic) sewage treatment device and A2O sewage treatment method |
| CN104761054A (en) * | 2015-03-19 | 2015-07-08 | 叶长兵 | Improvement and upgrading method of AO sewage treatment technology |
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|---|---|---|---|---|
| CN101113059A (en) * | 2007-06-22 | 2008-01-30 | 哈尔滨工业大学 | Method for low-temperature denitrification phosphorous removal |
| CN101857334A (en) * | 2009-04-07 | 2010-10-13 | 上海达源环境科技工程有限公司 | Sewage treatment device and sewage treatment process thereof |
| CN101880090A (en) * | 2010-02-03 | 2010-11-10 | 王鹤立 | Multifunctional complete-set sewage processing method and device |
| CN103253768A (en) * | 2013-04-11 | 2013-08-21 | 李思敏 | Multi-point water feeding town sewage treatment system and treatment method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59216697A (en) * | 1983-05-23 | 1984-12-06 | Kubota Ltd | Denitrification and dephosphorization due to activated sludge |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113059A (en) * | 2007-06-22 | 2008-01-30 | 哈尔滨工业大学 | Method for low-temperature denitrification phosphorous removal |
| CN101857334A (en) * | 2009-04-07 | 2010-10-13 | 上海达源环境科技工程有限公司 | Sewage treatment device and sewage treatment process thereof |
| CN101880090A (en) * | 2010-02-03 | 2010-11-10 | 王鹤立 | Multifunctional complete-set sewage processing method and device |
| CN103253768A (en) * | 2013-04-11 | 2013-08-21 | 李思敏 | Multi-point water feeding town sewage treatment system and treatment method thereof |
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