CN103613193A - 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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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, relate in particular 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 sewage is processed through anaerobic pond, anoxic pond and Aerobic Pond, finally carries out mud-water separation by settling tank, and the method can not only effectively be removed the organism in sewage, also can synchronous denitrification dephosphorizing.
But, existing A
2/ O also exists denitrogenation dephosphorizing efficiency to be difficult to the problem further significantly promoting, and its major cause is: (1) exists the carbon source race problem of denitrogenation and dephosphorization; (2) exist 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 of denitrogenating, and its key is in anoxic section, whether there is sufficient carbon source; Meanwhile, polyP bacteria also needs to absorb easily biodegradable organics in anaerobism section and releases phosphorus reaction, can be in aerobic section excessive suction phosphorus and reach the object of dephosphorization.Carbon source in water inlet lacks, i.e. 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 into the easy organism of degraded of 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 is 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, thereby cause polyP bacteria to release phosphorus effect, reduces, 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 are closely related.Too low reflux ratio difficulty has desirable denitrogenation dephosphorizing effect, but too high reflux ratio is also detested because causing, (lacking) oxygen section DO excessive concentration is difficult to be had higher denitrification effect and release phosphorus ability.Therefore, existing A
2/ O technique is all controlled 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 limited problem of denitrogenation dephosphorizing efficiency 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, to in described the first anaerobic pond, be communicated with the first anoxic pond, to in the second anaerobic pond, be communicated with the second anoxic pond, the 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 during 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, by the part sludge reflux in described secondary sedimentation basins in the first anaerobic pond; Stop the second anaerobic pond and the water inlet of the second anoxic pond, by described the second anaerobic pond and standing for some time of the second anoxic pond;
(3) when subregion water inlet is during 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, by the part sludge reflux in described secondary sedimentation basins 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 standing for some time, stop water inlet and the reflux operation of the second anoxic pond and the second anaerobic pond and enter step (2) in the first anaerobic pond and the first anoxic pond.
Preferably, in step (1), the ratio that described untreated sewage is injected into the amount of the first anaerobic pond and the first anoxic pond is (7～9): (1～3); The ratio that described untreated sewage is injected into the amount of the second anaerobic pond and the second anoxic pond is (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 part sludge reflux in described secondary sedimentation basins continues to stir to the first anaerobic pond or the second anaerobic pond time in the first anaerobic pond or the second anaerobic pond.
When preferably, the part of contaminated water in described Aerobic Pond is back in the first anoxic pond or the second anoxic pond, the first anoxic pond or the second anoxic pond are continued to stir.
Preferably, the time of repose in the first anaerobic pond described in the time of repose of the second anaerobic pond described in step (2) and the second anoxic pond and step (3) and the first anoxic pond is 1～4h.
The present invention overcomes the deficiencies in the prior art, and a kind of subregion inlet type D-A is provided
2o sewage water treatment method, by designing independent two-phase mud/nitrification liquid return-flow system, wherein one when normally intaking and keeping releasing phosphorus and denitrogenation mutually, in the quiet excessive anoxic of a phase factor of having a rest, carry out the phosphorus effect of releasing and the denitrogenation fully of excess, the phosphorus effect of releasing of guaranteeing system anaerobism section polyP bacteria excess must cause polyP bacteria to inhale phosphorus in the excess of aerobic section, finally the more significant dephosphorization effect of the system that realizes with the form of discharge excess sludge.In the present invention, also determine the control that untreated sewage is injected into the ratio of the amount between anaerobic pond and anoxic pond, can effectively avoid system because of the not enough not high problem of denitrogenation dephosphorizing efficiency causing of carbon source.In addition, in the present invention, the return sludge ratio of secondary sedimentation basins and the sewage backflow of Aerobic Pond are compared denitrogenation dephosphorizing efficiency of the present invention considerable influence.
Compare the shortcoming and defect with prior art, the present invention has following beneficial effect: the present invention has overcome A
2in O sewage treatment process, denitrogenation dephosphorizing efficiency is difficult to the problem further significantly promoting, and the stable effluent quality after the present invention processes is marked between surface water environment quality V class at one-level A.
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 are the input stream of untreated sewage, and B1 and B2 are nitrify water backflow stream, and C1 and C2 are sludge reflux stream, the water outlet stream that D is secondary sedimentation basins, the mud discharging stream that F is secondary sedimentation basins.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, 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, is 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, the first anoxic pond 2, the second anaerobic pond 3 and the second anoxic pond 4, to in described the first anaerobic pond 1, be communicated with the first anoxic pond 2, to in the second anaerobic pond 3, be communicated with the second anoxic pond 4, the 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 during 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, by the part sludge reflux in described secondary sedimentation basins in the first anaerobic pond 1; Stop the second anaerobic pond and the water inlet of the second anoxic pond, by described the second anaerobic pond 3 and second standing for some time of anoxic pond 4;
(3) when subregion water inlet is during 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, by the part sludge reflux in described secondary sedimentation basins in the second anaerobic pond 3; Stop the first anaerobic pond and the water inlet of the first anoxic pond, stop water inlet and reflux operation to the first anoxic pond 2, the first anaerobic pond 1 simultaneously, and, after standing for some time, stop water inlet and the reflux operation of the second anoxic pond 4 and the second anaerobic pond 3 and enter step (2) in the first anaerobic pond 1 and the first anoxic pond 2.
More specifically, the part sludge reflux in secondary sedimentation basins continues to stir to the first anaerobic pond 1 or the second anaerobic pond 3 time in the first anaerobic pond 1 or the second anaerobic pond 3.When the part of contaminated water in Aerobic Pond 5 is back in the first anoxic pond 2 or the second anoxic pond 4, the first anoxic pond 2 or the second anoxic pond 4 are continued to stir.Stirring mixes sewage or muddy water, 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 by having designed independent two-phase mud/nitrification liquid return-flow system, wherein, in step (2), the first anaerobic pond 1, the 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 that controls untreated sewage is that the first anaerobic pond 1 and the first anoxic pond 2 are injected untreated sewage, control nitrify water backflow stream B1 to the first anoxic pond 2 backflow nitrification liquids, 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), the second anaerobic pond 3 and the second anoxic pond 4, Aerobic Pond 5 and secondary sedimentation basins form not only but also second-phase mud/nitrification liquid return-flow system, the input stream A2 that controls untreated sewage is that the first anaerobic pond 3 and the first anoxic pond 4 are injected untreated sewage, control nitrify water backflow stream B2 to the first anoxic pond 4 backflow nitrification liquids, control sludge reflux stream C2 to the first anaerobic pond 3 returned sluges now, the second anaerobic pond 3 and the second anoxic pond 4 are in static condition.
In the present invention, for example, when first-phase mud/nitrification liquid return-flow system is worked, untreated sewage flow to respectively with certain proportion through constant flow pump in first anaerobic pond 1 and the first anoxic pond 2 of first-phase mud/nitrification liquid return-flow system, the new sewage that injects enters going out to flow sewage and can inject sewage and enter the first anoxic pond 2 from the backflow sewage of Aerobic Pond 5 with part is new again in the first anaerobic pond 1, the first anaerobic pond 1 together with the returned sluge from secondary sedimentation basins; In addition, the mud that is back to the first anaerobic pond 1 in secondary sedimentation basins stirs abundant mixing after 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 to by the overflow weir of Aerobic Pond 5 and in secondary sedimentation basins 6, 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 refluxing with Aerobic Pond 5, secondary sedimentation basins 6, mud connect to stir at stirrer makes active sludge microorganism fully contact and organic matter degradation, denitrogenation occur and release phosphorus reaction with the pollutent matrix in sewage, and the muddy water mixed solution of the first anoxic pond 2 flow to Aerobic Pond 5 and inhales phosphorus reaction.When system one is during with the operation of above-mentioned running status, another is mutually in the 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 has been realized processing and the dirty water purification of pollutent.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 to guarantee that system wherein one when normally intake and keeping releasing phosphorus and denitrogenation mutually, carries out the phosphorus effect of releasing and the sufficient denitrogenation of excess in the quiet excessive anoxic of a phase factor of having a rest.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 the more significant dephosphorization effect of the system that realizes with the form of discharge excess sludge.
More specifically, in order further to improve the effect that dephosphorization in sewage is denitrogenated, in embodiments of the present invention, in above-mentioned steps (1), the ratio that described untreated sewage is injected into the amount of the first anaerobic pond 1 and the first anoxic pond 2 is (7～9): (1～3); The ratio that described untreated sewage is injected into the amount of the second anaerobic pond 3 and the second anoxic pond 4 is (7～9): (1～3).
In actual application of the present invention, adopt from A
2the anaerobic pond of/O and anoxic pond be water inlet respectively by a certain percentage, can effectively avoid system because of the not enough not high problem of denitrogenation dephosphorizing efficiency causing of carbon source.
More specifically, for the better control to 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.
For the effect that better proof the present invention denitrogenates the dephosphorization having 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 ℃; 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, by the stable effluent quality after method processing of the present invention, at one-level A, mark between surface water environment quality V class.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
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, to in described the first anaerobic pond, be communicated with the first anoxic pond, to in the second anaerobic pond, be communicated with the second anoxic pond, the 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 during 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, by the part sludge reflux in described secondary sedimentation basins in the first anaerobic pond; Stop the second anaerobic pond and the water inlet of the second anoxic pond, by described the second anaerobic pond and standing for some time of the second anoxic pond;
(3) when subregion water inlet is during 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, by the part sludge reflux in described secondary sedimentation basins 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 standing for some time, stop water inlet and the reflux operation of the second anoxic pond and the second anaerobic pond and enter step (2) in the first anaerobic pond and the first anoxic pond.
2. subregion inlet type D-A as claimed in claim 1
2o sewage water treatment method, is characterized in that, in step (1), the ratio that described untreated sewage is injected into the amount of the first anaerobic pond and the first anoxic pond is (7～9): (1～3); The ratio that described untreated sewage is injected into the amount of the second anaerobic pond and the second anoxic pond is (7～9): (1～3).
3. subregion inlet type D-A as claimed in claim 2
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.
4. subregion inlet type D-A as claimed in claim 3
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.
5. subregion inlet type D-A as claimed in claim 4
2o sewage water treatment method, is characterized in that, the part sludge reflux in described secondary sedimentation basins continues to stir to the first anaerobic pond or the second anaerobic pond time in the first anaerobic pond or the second anaerobic pond.
6. subregion inlet type D-A as claimed in claim 5
2o sewage water treatment method, is characterized in that, when the part of contaminated water in described Aerobic Pond is back in the first anoxic pond or the second anoxic pond, the first anoxic pond or the second anoxic pond is continued to stir.
7. subregion inlet type D-A as claimed in claim 5
2o sewage water treatment method, is characterized in that, at the time of repose of the first anaerobic pond described in the time of repose of the second anaerobic pond described in step (2) and the second anoxic pond and step (3) and the first anoxic pond, is 1～4h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| JPH0227038B2 (en) * | 1983-05-23 | 1990-06-14 | Kubota Ltd | |
| 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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2013
- 2013-11-25 CN CN201310596065.2A patent/CN103613193B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0227038B2 (en) * | 1983-05-23 | 1990-06-14 | Kubota Ltd | |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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