CN1280210C - Carbon source denitrogenation inside cells for sewage - Google Patents
Carbon source denitrogenation inside cells for sewage Download PDFInfo
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- CN1280210C CN1280210C CN 200410017331 CN200410017331A CN1280210C CN 1280210 C CN1280210 C CN 1280210C CN 200410017331 CN200410017331 CN 200410017331 CN 200410017331 A CN200410017331 A CN 200410017331A CN 1280210 C CN1280210 C CN 1280210C
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- denitrification
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- sewage
- intracellular polymer
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Abstract
The present invention relates to a technology for extracting nitrogen from carbon sources in cells for sewage. Under good oxygen conditions, microorganisms can absorb dissolved organic substances in the sewage for a short time, and the organic substances exist in the cells of the microorganisms in a main mode of endocellular polymers and are used as denitrification carbon sources in a subsequent denitrification pool. The present invention makes use of the principle to design a corresponding technological line and enables the processed sewage to reach the primary discharge standard prescribed by countries in the steps of a mixing reaction, solid-liquid separation, nitration, denitrification, etc. The present invention has the advantages of simple technology, low cost, energy consumption saving and high efficiency of extracting nitrogen, and is suitable for urban sewage to process.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of sewage born of the same parents internal carbon source denitrogenation.
Background technology
At the beginning of last century, invention along with biological process of wastewater treatment, the water pollution control technology obtains very big progress, arrived the seventies, the black smelly problem of western developed country water body is resolved basically, the consequent is the body eutrophication problem that is caused by polluted by nitrogen, and worldwide becomes increasingly conspicuous.In the water body in landlocked river and lake, nitrogen is the controlling factor of eutrophication.Since then, denitride technology becomes the research focus of international environmental technology field academia and the concern of engineering circle always, and has invented multiple denitride technology, mainly is divided into physico-chemical process and bioremediation.
The physico-chemical process of denitrogenation of waste water mainly contains blow-off method, break point chlorination, selection ion exchange method, catalytic oxidation etc., mainly be applicable to the processing of high-concentration ammonia nitrogenous wastewater, and exist the processing cost height, big to environmental influence, produce secondary pollution problems.And biological denitrificaion is more economical than physico-chemical process, and is more suitable to the municipal effluent that ammonia nitrogen concentration is low relatively.Biological denitrificaion is to be undertaken by " nitrated-denitrification " process.The nitrated process that promptly ammonia nitrogen is changed continuously into nitrate nitrogen by the bacterium of nourishing one's nature certainly under the condition of aerobic, denitrification are promptly by the facultative denitrifying bacterium of different oxygen, and transforming nitrate under anoxia condition is the process of nitrogen.Heterotrophic bacterium and denitrification heterotrophic bacterium from nitrifier of nourishing one's nature and degradation of organic substances are compared, and the generation cycle is long, competitive capacity a little less than, therefore nitrated need are low in organic carbon concentration, organic loading is low and the condition of aerobic under just can carry out.
And contain pollutents such as organism, ammonia nitrogen in the sewage usually, this make to remove organism, nitrated, denitrification and is difficult in the reactor simultaneously, efficiently finishes, therefore general sewage water denitrification technology all at its water quality and participate in reaction several big class different microorganisms characteristics and design, its relative merits are respectively arranged, and main method is as follows:
(1) O/A technology
This is a kind of biological denitrification process of widespread use, also claims rear-mounted denitrification, it be the aerobic reaction pond preceding, the anoxic denitrification pond after.In aerobic reactor, carry out organic degraded earlier, nitrated then, in the hypoxia response pond, carry out denitrification.Because aerobic nitrification pond outlet water organic substance concentration is very low, need add carbon source in the denitrification pond.Research and engineering practice show, this method nitric efficiency is high and stablize, but there is the following defective in it: (1) need add carbon source in the denitrification pond, and medicament expense is with high, and dosage is difficult to grasp and causes organic leakage easily; (2) because need add medicament and automatic online monitoring and control, equipment is many, the operating requirement height, and complex management requires high to operator quality; (3) all aerobic CO that changes into of carbon in the water inlet
2And H
2O, hydraulic detention time is long, and the pond volume is big, and floor space is big, the capital cost height; (4) aeration power consumption height.
(2) A/O technology
This also is research at present and a kind of biological denitrification process that is most widely used, and also claims Prepositive denitrification.It is that the anoxic denitrification pond is preceding, the aerobic nitrification pond after, organism in its utilization water inlet is as denitrifying carbon source, overcome the O/A method and need add the defective of medicament as denitrifying carbon source, but it also has following defective inevitably: (1) needs a large amount of backflow mixed liquor to improve nitric efficiency, it is 7～8: 1 that reflux ratio requires usually, so energy consumption is big, the working cost height; (2) nitric efficiency is low; (3) contain certain density nitrate in the water outlet, in second pond, might carry out anti-nitration reaction, cause the mud come-up, influence effluent quality.And nitrate can bring out baby's methemoglobinemia, and nitrate further is converted into nitrosamine and then has serious " three cause " effect, directly threatens human beings'health.
(3) biological filter
Utilize the dissolved oxygen concentration graded that forms in the microbial film, under outer aerobic conditions, carry out the oxidation of organic carbon and nitrated, in the internal layer anaerobic environment, carry out denitrification.Though the fixed growth of microorganism on film helps the growth of the long nitrobacteria of nourishing one's nature certainly generation time, also only under the underload situation, occur nitratedly, and also have the following defective: (1) uses filler, has increased investment cost greatly, the cost height; (2) could occur nitratedly under the underrun condition, the pond volume is big, the cost height; (3) nitric efficiency is low; (4) film comes off easily to produce and stops up; (5) water distribution is difficult for evenly; (6) growth pond fly etc.
Summary of the invention
The objective of the invention is to propose a kind of saving energy, cost is low, efficient is high sewage denitrification method.
The sewage water denitrification method that the present invention proposes, it is the newest research results of having utilized the environmental protection field, promptly under aerobic condition, microorganism can (5-10 minute usually) absorb dissolved organic matter in the water in the extremely short time, the in fact most of form with intracellular polymer (being mainly polyhydroxyalkanoatefrom (PHA) or glycogen) of this organism is stored in the microorganism cells, does not degrade to CO
2And H
2O.These intracellular polymers can be used as denitrifying carbon source in denitrification pond subsequently.Therefore, the present invention is called sewage born of the same parents internal carbon source denitrogenation.The present invention had both overcome need add chemical agent as denitrifying carbon source and the high shortcoming of organism complete oxidation energy consumption in the O/A method denitrification process, having overcome the A/O denitrification process again needs a large amount of backflow mixtures, energy consumption height, water outlet nitrate nitrogen (NO
3 --N) high shortcoming can also be saved oxidation of organic compounds institute energy requirement, reduces surplus sludge volume, improves nitric efficiency.
Technical process of the present invention is seen shown in Figure 1.Denitrification equipment forms pond 1, intermediate sedimentation pond 2, nitrification tank 3, intracellular polymer denitrification pond 4 and second pond 5 by intracellular polymer and is communicated with successively and forms.
Concrete steps are as follows:
1, intracellular polymer forms, with municipal effluent through after the pre-treatment with come from the returned sluge of second pond under aerobic conditions, form thorough mixing in the pond 1 at intracellular polymer, the hybrid reaction time is 20～40 minutes, formation contains the mud of a large amount of intracellular polymers, effectively remove chemical oxygen demand (COD) (COD) and biochemical oxygen demand (BOD) (BOD) simultaneously, dissolved oxygen (DO) is controlled at 〉=1.5mg/l;
2, solid-liquid separation, the mixed solution that intracellular polymer forms in the pond 1 enters intermediate sedimentation pond 2, carries out solid-liquid separation, and sedimentation time is 1.5～2.0 hours; Supernatant liquor flows into nitrification tank, and the precipitating sludge that contains a large amount of intracellular polymers flows into intracellular polymer denitrification pond 4, and discharge is 50～100% flooding velocity;
3, nitrated, the supernatant liquor in the medium sediment pool 2 flows into nitrification tank 3, carries out nitrated;
4, denitrification, the mixed solution that comes from nitrification tank 3 enters intracellular polymer denitrification pond 4 with the mud that contains a large amount of intracellular polymers that comes from medium sediment pool 2, mixes, under the effect of denitrification heterotrophic bacterium, utilize intracellular polymer (PHA or glycogen), to make NO as carbon source
3-N is reduced to N
2Thereby enter atmosphere.And mud obtains regeneration owing to the degraded of its intracellular polymer, has the ability that very strong absorption dissolved organic matter forms intracellular polymer again.In 0.5～1.0 hour reaction times, adopt diving mixer to mix;
5, solid-liquid separation once more, the mixed solution that comes from intracellular polymer denitrification pond 4 enters second pond 5, carries out solid-liquid separation once more, and sedimentation time is 2.0～2.5 hours, the precipitated outlet water discharging.Precipitating sludge is partly refluxed to intracellular polymer and forms pond (50～100%) and nitrification tank (0～50%) (specifically according to circumstances need and decide), and the rest part precipitating sludge is an excess sludge, and outside the discharging can be discharged once in one day.
In the aforesaid method, come from the supernatant liquor in intermediate sedimentation pond 2, COD and BOD concentration are low, NH
3-N concentration height, enter nitrification tank 3 after, help carrying out nitration reaction efficiently from nourishing one's nature the growth of nitrifier, can effectively transform NH
3-N etc. are to nitrate nitrogen (NO
3-N), also can remove remaining organism simultaneously.This nitrification tank can select for use following several reactor wherein a kind of: soft-filler bed bioreactor, floating stuffing bed bioreactor, plug flow reactor according to practical situation:
(1) soft-filler bed bioreactor, effectively 1～6 hour duration of contact, DO (dissolved ammonia) in the solution 〉=2mg/l need not returned sluge.
(2) suspension fiber packed column reactor, 3～7 hours reaction times, DO 〉=2mg/L in the solution, the filler rate of adding is 20～60%, more excellent be 45-50%, need from the second pond returned sluge to nitrification tank, reflux ratio 10～30% flow that becomes a mandarin.
(3) plug flow reactor, the reaction times is 5-10 hour, and DO 〉=1mg/L in the solution also needs from the second pond returned sluge to nitrification tank, and reflux ratio is 30～50% flows that become a mandarin.
After the present invention handles, can make water outlet COD≤60mg/l, biochemical oxygen demand (BOD) BOD on the 5th
5≤ 20mg/l, suspended solids SS≤20mg/l, total nitrogen TN-N≤20mg/l, NH
3-N≤8mg/l (temperature＞12 ℃), NH
3Indications such as-N≤15mg/l (temperature≤12 ℃) all can reach or be better than country's " urban wastewater treatment firm pollutant emission standard " primary standard (B standard) requirement (GB18918-2002).
The present invention relatively sees Table 1 with typical biological denitrificaion Treating Municipal Sewage technology (O/A and A/O) feature.Hence one can see that of the present inventionly has a remarkable advantages.
Table 1. the present invention and the typically comparison of biological denitrificaion sewage treatment (O/A and A/O)
| Feature | The present invention | O/A | A/O |
| Reaction tank volume (floor space) capital cost medicament expense energy consumption working cost is removed the total nitrogen ability | Slight no slight big | In having greatly greatly | In in no large, medium and small |
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Number in the figure: 1 for intracellular polymer forms the pond, and 2 is medium sediment pool, and 3 is nitrification tank, and 4 is intracellular polymer denitrification pond, and 5 is second pond.
Embodiment
Embodiment 1
Come from the somewhere municipal effluent through grid, after sand setting and the just heavy pre-treatment with the returned sluge that comes from second pond in intracellular polymer formation pond from minute mixing, hydraulic detention time is 40 minutes, dissolved oxygen is controlled at about 2mg/l, the mixed solution that from intracellular polymer formation pond, comes out, enter the intermediate sedimentation pond, sedimentation time is 1.5 hours, precipitating sludge flows into intracellular polymer denitrification pond, supernatant liquor is gone into nitrification tank (adopting the soft cellulose filler bed bioreactor), hydraulic detention time is 6 hours, dissolved oxygen is controlled at about 3.5mg/l, enter intracellular polymer denitrification pond from the effusive liquid of nitrification tank, mix mutually with the mud that contains a large amount of intracellular polymers from the intermediate sedimentation pond, hydraulic detention time 1.0 hours, adopting under water, slow speed of revolution diving mixer mixes.Enter second pond from the effusive mixed solution in intracellular polymer denitrification pond, sedimentation time is 2.0 hours, and supernatant liquor is discharged, and the precipitating sludge part flow to intracellular polymer through blowback and forms pond, reflux ratio 100%.
After testing, water inlet (following data are all in mean value, and intaking is the preliminary sedimentation tank water outlet) COD mean value is 270mg/l, water outlet 55mg/l; Water inlet NH
3-N 22mg/l, NO
3-N, NO
2-N is zero, TN-N 50mg/l, water outlet NH
3-N 7mg/l (temperature＞12 ℃), NH
3-N 11mg/l (temperature≤12 ℃), NO
3-N, NO
2-N is zero, TN-N 15mg/l (temperature＞12 ℃), TN-N19mg/l (temperature≤12 ℃).
Embodiment 2
Come from the somewhere municipal effluent after grid, sand setting and just heavy pre-treatment with the returned sluge that comes from second pond in intracellular polymer formation pond from minute mixing, hydraulic detention time is 30 minutes, dissolved oxygen is controlled at about 2mg/l.The mixed solution that from intracellular polymer formation pond, comes out, enter the intermediate sedimentation pond, sedimentation time is 1.5 hours, precipitating sludge flows into intracellular polymer denitrification pond, supernatant liquor is gone into nitrification tank (soft cellulose filler bed bioreactor), effectively the residence time is 4.5 hours, and dissolved oxygen is controlled at about 3mg/l.Enter intracellular polymer and nitrification tank from the effusive liquid of nitrification tank, mix mutually with the mud that contains a large amount of intracellular polymers from the intermediate sedimentation pond, hydraulic detention time 0.75 hour adopts slow speed of revolution diving mixer to mix.Enter second pond from the effusive mixed solution in intracellular polymer denitrification pond, sedimentation time is 2.0 hours, and supernatant liquor is discharged, and the precipitating sludge part flow to intracellular polymer through blowback and forms pond, reflux ratio 75%.
After testing, water inlet (following data are all in mean value, and intaking is the preliminary sedimentation tank water outlet) COD mean value is 168mg/l, water outlet 50mg/l; Water inlet NH
3-N 17mg/l, NO
3-N, NO
2-N is zero, TN-N 26mg/l, water outlet NH
3-N 6mg/l (temperature＞12 ℃), NH
3-N 10mg/l (temperature≤12 ℃), NO
3-N, NO
2-N is zero, TN-N 10mg/l (temperature＞12 ℃), TN-N16mg/l (temperature≤12 ℃).
Embodiment 3
Come from the somewhere municipal effluent through grid, after sand setting and the just heavy pre-treatment with the returned sluge that comes from second pond in intracellular polymer formation pond from minute mixing, hydraulic detention time is 20 minutes, dissolved oxygen is controlled at about 2mg/l, the mixed solution that from intracellular polymer formation pond, comes out, enter the intermediate sedimentation pond, sedimentation time is 1.5 hours, precipitating sludge flows into intracellular polymer denitrification pond, supernatant liquor is gone into nitrification tank (soft cellulose filler bed bioreactor), hydraulic detention time is 3 hours, dissolved oxygen is controlled at about 2.5mg/l, enter intracellular polymer denitrification pond from the effusive liquid of nitrification tank, mix mutually with the mud that contains a large amount of intracellular polymers from the intermediate sedimentation pond, hydraulic detention time 0.5 hour, adopting under water, slow speed of revolution diving mixer mixes.Enter second pond from the effusive mixed solution in intracellular polymer denitrification pond, sedimentation time is 2.5 hours, and supernatant liquor is discharged, and the precipitating sludge part flow to intracellular polymer through blowback and forms pond, reflux ratio 50%.
After testing, water inlet (following data are all in mean value, and intaking is the preliminary sedimentation tank water outlet) COD mean value is 128mg/l, water outlet 43mg/l; Water inlet NH
3-N 16mg/l, NO
3-N, NO
2-N is zero, TN-N 21.3mg/l, water outlet NH
3-N 6mg/l (temperature＞12 ℃), NH
3-N 11mg/l (temperature≤12 ℃), NO
3-N, NO
2-N is zero, TN-N 10mg/l (temperature＞12 ℃), TN-N15mg/l (temperature≤12 ℃).
Claims (2)
1, a kind of sewage born of the same parents internal carbon source denitrogenation, denitrification equipment form pond (1), medium sediment pool (2), nitrification tank (3), intracellular polymer denitrification pond (4) and second pond (5) by intracellular polymer and are communicated with successively and form, and it is characterized in that concrete steps are as follows:
(1) intracellular polymer forms, with municipal effluent through after the pre-treatment with the returned sluge that comes from second pond under aerobic conditions, form thorough mixing in the pond (1) at intracellular polymer, the hybrid reaction time is 20～40 minutes, dissolved oxygen 〉=1.5mg/l;
(2) solid-liquid separation, the mixed solution that intracellular polymer forms in the pond (1) enters medium sediment pool (2), carries out solid-liquid separation, and sedimentation time is 1.5～2.0 hours; Supernatant liquor inflow nitrification tank carries out nitrated, and the precipitating sludge that contains a large amount of intracellular polymers flows into intracellular polymer denitrification pond (4), and discharge is 50～100% flooding velocity;
(3) nitrated, the supernatant liquor in the medium sediment pool (2) flows into nitrification tank (3), carries out nitrated;
(4) denitrification, the mixed solution that comes from nitrification tank (3) enters intracellular polymer denitrification pond (4) with the mud that contains a large amount of intracellular polymers that comes from medium sediment pool (2), mixes 0.5～1.0 hour reaction times;
(5) solid-liquid separation once more, the mixed solution in intracellular polymer denitrification pond (4) enters second pond (5) from the beginning, carries out solid-liquid separation once more, and sedimentation time is 2.0～2.5 hours, the precipitated outlet water discharging; Precipitating sludge is partly refluxed to intracellular polymer and forms pond and nitrification tank, and the rest part precipitating sludge is an excess sludge, outwards discharging.
2, sewage born of the same parents internal carbon source denitrogenation according to claim 1 is characterized in that nitrification tank (3) is selected from a kind of of following reactor: soft-filler bed bioreactor, floating stuffing bed bioreactor, plug flow reactor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017331 CN1280210C (en) | 2004-03-30 | 2004-03-30 | Carbon source denitrogenation inside cells for sewage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017331 CN1280210C (en) | 2004-03-30 | 2004-03-30 | Carbon source denitrogenation inside cells for sewage |
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|---|---|
| CN1562806A CN1562806A (en) | 2005-01-12 |
| CN1280210C true CN1280210C (en) | 2006-10-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318741B (en) * | 2008-07-11 | 2011-01-05 | 北京城市排水集团有限责任公司 | Apparatus and method for synchronous denitrification and development of sewage sludge internal carbon source of urban sewage |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295353A (en) * | 2011-08-16 | 2011-12-28 | 上海交通大学 | Method for realizing synchronous denitrification and dephosphorization of sewage |
| CN105417687B (en) * | 2016-01-07 | 2018-05-29 | 江苏裕隆环保有限公司 | The method and apparatus of sewage and bed mud in a kind of Combined Treatment black-odor riverway |
| CN115010321A (en) * | 2022-06-20 | 2022-09-06 | 苏州苏沃特环境科技有限公司 | Wastewater denitrification treatment system and method based on two-stage nitrification and denitrification |
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- 2004-03-30 CN CN 200410017331 patent/CN1280210C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318741B (en) * | 2008-07-11 | 2011-01-05 | 北京城市排水集团有限责任公司 | Apparatus and method for synchronous denitrification and development of sewage sludge internal carbon source of urban sewage |
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| Publication number | Publication date |
|---|---|
| CN1562806A (en) | 2005-01-12 |
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