CN102616993A - Residual sludge zero discharge denitrification and phosphorous removal process and device - Google Patents
Residual sludge zero discharge denitrification and phosphorous removal process and device Download PDFInfo
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- CN102616993A CN102616993A CN2012100900580A CN201210090058A CN102616993A CN 102616993 A CN102616993 A CN 102616993A CN 2012100900580 A CN2012100900580 A CN 2012100900580A CN 201210090058 A CN201210090058 A CN 201210090058A CN 102616993 A CN102616993 A CN 102616993A
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Abstract
The invention belongs to the technical field of sewage treatment and particularly relates to a residual sludge zero discharge denitrification and phosphorous removal process. A chemical phosphor recovery work procedure is added on the basis of the traditional biological denitrification and phosphorous removal process, the sludge concentration in an anaerobic pool, an anoxic pool and an aerobic pool is regulated and controlled, and the gradient partitions are formed. The process provided by the invention has the advantages that the rest sludge zero discharge is realized, meanwhile, the goal of synchronous denitrification and phosphorous removal is reached, and the energy consumption of the waste water treatment is obviously reduced.
Description
Technical field
The invention belongs to technical field of sewage, particularly a kind of excess sludge zero release denitrification dephosphorization technique and device.
Background technology
Body eutrophication has become more and more serious global environmental problem, and this mainly is because the excess discharging of nutritive substances such as nitrogen, phosphorus in environment causes.Therefore, the removal of nitrogen phosphorus also more and more obtains paying attention in the sewage.Existing denitrification dephosphorization technique has good effect to the denitrogenation dephosphorizing of waste water; Biological phosphate-eliminating is the mikrobe that utilizes one type of polyP bacteria; Can excessively, quantitatively surpass its physiological requirements, absorb phosphorus from outside atmosphere, and phosphorus is housed in the thalline with the polymeric form; Form outside the high phosphorus sludge removal system, reach the effect of dephosphorization from sewage.But because the restriction of its dephosphorization mechanism along with the increase of treatment capacity, is handled the raising of standard and the expansion of processing capacity, surplus sludge volume will increase considerably.
Owing to contain a large amount of objectionable impuritiess and pathogenic micro-organism in the excess sludge, unprocessed just discharging will cause severe contamination to environment.Sludge reduction method commonly used mainly contains three kinds, i.e. physics method, chemical method and ecological method.Wherein physics method cardinal principle is to adopt methods such as mechanical force, UW, steam heating to make the active sludge disintegration of part homergy dead; Be converted into the matrix of biological treatment of waste water system and be degraded; But energy consumption is very big; Cost is high, and is very uneconomical concerning extensive biological wastewater treatment.Chemical method is directly to kill or the active sludge that suppresses the part homergy reaches the minimizing purpose through the method that adds oxygenant, metabolic poison, zymin or artificially make up severe environmental conditions; But need adhere to long-term dosing or keep the high-solubility oxygen operating mode, there is the relatively poor shortcoming of economy in large-scale promotion application.Ecological method is based on food chain predation principle, controlledly raises the microfauna active sludge of part homergy of eating, thereby reduces excess sludge production.The Wang Qunhui of University of Science & Technology, Beijing etc. adopt the novel process of hydrolysis acidification pool+dephosphorization pond+MULTI CONTACT oxidation pond, utilize the mikrobe predation of multi-stage oxidizing section to reach the purpose of excess sludge zero release.Though running cost is lower, there is the unmanageable more critical defect of the big more microfauna quantity of scale, no application value.To sum up, present mud decrement technology receives the restriction of economic feasibility or technical feasibility in application process, does not see the case of extensive use so far.How when realizing denitrogenation dephosphorizing, to reach the excess sludge zero release and be still the difficult problem that domestic and international engineering of water treatment circle needs to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of excess sludge zero release denitrification dephosphorization technique and device, when realizing denitrogenation dephosphorizing, reach the excess sludge zero release.
The technical scheme that the present invention adopts is following:
A kind of excess sludge zero release denitrification dephosphorization technique increases the chemical phosphorus recovery operation on traditional biological denitrification dephosphorization technique basis, sludge concentration in anaerobic pond, anoxic pond and the Aerobic Pond is regulated and control, and forms the gradient subregion.
Comparatively concrete, sewage passes through anaerobic pond, anoxic pond and Aerobic Pond successively, and wherein the rich phosphorus supernatant of anaerobic pond is all or part of gets into anoxic pond again through behind the chemical dephosphorization; Be provided with the sludge concentration that the regulation and control of solid-liquid separation assembly get into Aerobic Pond in the anoxic pond, the mud regulation and control of Aerobic Pond are back to anaerobic pond, and the nitrification liquid regulation and control of Aerobic Pond are back to anoxic pond, mixed solution water outlet after solid-liquid separation in the Aerobic Pond.
Sludge concentration in the Aerobic Pond is controlled to be 2-4g/L.
Effective separation aperture of solid-liquid separation assembly is 0.01 μ m-1mm in the anoxic pond.
The nitrification liquid of Aerobic Pond is back to anoxic pond, and reflux ratio is 10-900%.
The return sludge ratio of Aerobic Pond to anaerobic pond is 10-600%.
The ratio of rich phosphorus supernatant entering chemical dephosphorization is confirmed to get final product according to the needs of dephosphorization by those skilled in the art in the anaerobic pond.
After water separated through the separation assembly that wherein is provided with in the anoxic pond, water outlet got into Aerobic Pond.
The present invention is formed by materialization processing and biological treatment optimum combination, and it is chemical dephosphorization that described materialization is handled, and the phosphorus in the waste water is removed through chemical process, avoids the subsequent biological treatment dephosphorization to produce a large amount of rich phosphorus excess sludges; On the other hand, adopt the phosphoric acid salt that forms in the chemical dephosphorization process can carry out recycling, such as using as phosphate fertilizer or industrial raw material; Described biological treatment is to be formed by anaerobic biological treatment, anoxic biological treatment and aerobic biological treatment process optimum combination successively; Biological treatment and materialization treatment combination are used, and be high to organic matter removal efficient in the waste water, can realize good denitrogenation dephosphorizing effect simultaneously.Its characteristics are on traditional biological denitrification dephosphorization technique basis, to increase the chemical phosphorus recovery operation, adopt the solid-liquid separation assembly that sludge concentration in anaerobic pond, anoxic pond and the Aerobic Pond is carried out artificial regulatory simultaneously, form the gradient subregion.Under the basic permanence condition of mud total amount, anaerobic pond and anoxic pond are kept higher sludge concentration in system, and Aerobic Pond then with lower sludge concentration operation, has reached the synchronous denitrification dephosphorizing purpose when realizing the excess sludge zero release.Wherein mikrobe is accomplished organic removal and denitrification in anoxic pond, and because the Aerobic Pond sludge concentration is lower, aeration rate significantly reduces, and the energy consumption of wastewater treatment significantly reduces.
The present invention further provides a kind of excess sludge zero release denitrification dephosphorization apparatus; Aerobic Pond after comprising successively anaerobic pond, the anoxic pond through pipe connection and being connected in anoxic pond wherein also has pipe connection that the chemical dephosphorization device is arranged in addition between anaerobic pond and anoxic pond; Be provided with the solid-liquid separation assembly in the described anoxic pond, also be provided with sludge return pipe between Aerobic Pond and anaerobic pond.
Effective separation aperture of the solid-liquid separation assembly of establishing in the anoxic pond is 0.01 μ m-1mm.
Solid-liquid separation assembly pattern can be grid, board-like, rolling, tubular type, curtain formula or other.
Anoxic pond and Aerobic Pond can be provided with separately, also can merge setting; When both were provided with separately, Aerobic Pond was provided with the nitrification liquid reflux and is connected to anoxic pond.Merge when being provided with, device space bar capable of using and Aerobic Pond bottom ramp realize the backflow of mud and mixed solution, because nitrification liquid can independently be back to anoxic pond from Aerobic Pond, therefore can not establish reflux, and not only simplified control can also cut down the consumption of energy.
Be provided with equipment for separating liquid from solid in the Aerobic Pond or be provided with settling tank outward, the water in the Aerobic Pond separates back water outlet, perhaps water outlet after peripheral hardware settling tank solid-liquid separation through equipment for separating liquid from solid.
The present invention has following advantage with respect to prior art:
Technology of the present invention has reached the synchronous denitrification dephosphorizing purpose in the excess sludge zero release, the energy consumption of wastewater treatment simultaneously significantly reduces.
Description of drawings
Fig. 1 is an excess sludge zero release denitrification dephosphorization technique schema in the WWT of the present invention;
Fig. 2 is a device schema of the present invention, and wherein 1 is anaerobic pond, and 2 is anoxic pond, and 3 is Aerobic Pond, and 4 is the solid-liquid separation assembly, and 5 is the chemical dephosphorization district, and 6 is whisking appliance.
Embodiment
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
A kind of excess sludge zero release denitrification dephosphorization technique, its flow process are referring to Fig. 1, and institute's using appts is referring to Fig. 2.
Institute's using appts comprises successively through anaerobic pond 1, the anoxic pond 2 of pipe connection and the Aerobic Pond 3 after being connected in anoxic pond 2, and wherein 2 of anaerobic pond 1 and anoxic pond also have pipe connection that chemical dephosphorization device 5 is arranged in addition; Be provided with solid-liquid separation assembly 4 in the described anoxic pond 2,1 of Aerobic Pond 3 and anaerobic pond also are provided with sludge return pipe.Wherein, anoxic pond 2 merges setting with Aerobic Pond 3, is provided with dividing plate between device, and dividing plate has (0.1m-10m) with a certain distance from the bottom, and ramp designs is adopted in Aerobic Pond 3 bottoms, and slope and horizontal direction angle can be selected 0-90 ° of scope; Effective separation aperture of the solid-liquid separation assembly of establishing in the anoxic pond 24 is 0.01 μ m-1mm.
In conjunction with said apparatus, excess sludge zero release denitrification dephosphorization technique is following:
Sewage and Aerobic Pond 3 returned sluge mixed solutions at first get into anaerobic pond 1 and carry out the release of phosphorus; Rich phosphorus supernatant partly gets into chemical dephosphorization district 5 in the anaerobic pond 1; In chemical dephosphorization district 5, add chemical dephosphorization agent and remove most of phosphorus, avoid the subsequent biological treatment dephosphorization to produce a large amount of rich phosphorus excess sludges.Sewage gets in anoxic pond 2, the Aerobic Pond 3 merging setting devices and carries out a biological disposal upon behind chemical dephosphorization.Through solid-liquid separation assembly 4 with anoxic pond 2 water outlet vast scale suction Aerobic Ponds 3; And muddy water mixed solution flows in the anoxic pond 2 from the dividing plate below certainly in the Aerobic Pond 3, thereby realizes that Aerobic Pond 3 nitrification liquids and activity sludge reflux carry out the purpose of denitrification denitrogenation to anoxic pond 2.Mud also is back to anaerobic pond 1 through pipeline in the Aerobic Pond simultaneously.The design that Aerobic Pond merges setting device makes anoxic pond keep higher sludge concentration; And Aerobic Pond maintains a lower sludge concentration; Make in the biological treatment system that microorganism cells growth and decline reach running balance in the mud; Do not have excess sludge to produce, reach the purpose of sludge zero discharge.
Embodiment 1
Certain large size city sewage work makes an experiment to the north: its winter, actual influent quality average COD was 660mg/L, and BOD5 is 270 mg/L, and SS is 650 mg/L, NH
3-N is 35 mg/L, and TP is 9.3 mg/L, and TN is 57 mg/L.Control anaerobic pond, anoxic pond, Aerobic Pond sludge concentration are respectively 12g/L, 8g/L, 3g/L in MLSS, and Aerobic Pond to anaerobic pond return sludge ratio is 50%, Aerobic Pond to anoxic pond nitrification liquid reflux ratio 400%.Through detecting, the effluent quality average COD is 32mg/L, and BOD5 is 5 mg/L, and SS is 1.1 mg/L, NH
3-N is 0.7mg/L, and TP is 0.28 mg/L, and TN is 12 mg/L, and each item index all reaches " urban wastewater treatment firm pollutant emission standard " one-level A standard (GB18918--2002), and average ton water power consumption is assessed and is about 0.27kWh/m
3Effective separation aperture of solid-liquid separation assembly 4 is 0.035mm.
Embodiment 2
The actual influent quality average COD in summer of certain large size city sewage work of the north is 381mg/L, and BOD5 is 116 mg/L, and SS is 950 mg/L, NH
3-N is 31 mg/L, and TP is 9.9 mg/L, and TN is 34 mg/L.Control anaerobic pond, anoxic pond, Aerobic Pond sludge concentration are respectively 10g/L, 7g/L, 2g/L in MLSS, the return sludge ratio 60% of Aerobic Pond to anaerobic pond, the nitrification liquid reflux ratio 300% of Aerobic Pond to anoxic pond.Through detecting, the effluent quality average COD is 20mg/L, and BOD5 is 2 mg/L, and SS is 0.8 mg/L, NH
3-N is 0.5mg/L, and TP is 0.45 mg/L, and TN is 9mg/L, and each item index all reaches " urban wastewater treatment firm pollutant emission standard " one-level A standard (GB18918--2002), and average ton water power consumption is assessed and is about 0.15kWh/m
3Effective separation aperture of solid-liquid separation assembly 4 is 0.025mm.
The foregoing description is the preferred embodiment of the present invention, but embodiment of the present invention is not restricted to the described embodiments, and other the change that any the present invention of not deviating from did all should be the substitute mode of equivalence, is included within protection scope of the present invention.
Claims (10)
1. an excess sludge zero release denitrification dephosphorization technique is characterized in that, on traditional biological denitrification dephosphorization technique basis, increases the chemical phosphorus recovery operation, and sludge concentration in anaerobic pond, anoxic pond and the Aerobic Pond is regulated and control, and forms the gradient subregion.
2. excess sludge zero release denitrification dephosphorization technique as claimed in claim 1 is characterized in that sewage passes through anaerobic pond, anoxic pond and Aerobic Pond successively, and wherein the rich phosphorus supernatant of anaerobic pond is all or part of gets into anoxic pond again through behind the chemical dephosphorization; Be provided with the sludge concentration that the regulation and control of solid-liquid separation assembly get into Aerobic Pond in the anoxic pond, the mud regulation and control of Aerobic Pond are back to anaerobic pond, and the nitrification liquid regulation and control of Aerobic Pond are back to anoxic pond, mixed solution water outlet after solid-liquid separation in the Aerobic Pond.
3. excess sludge zero release denitrification dephosphorization technique as claimed in claim 2 is characterized in that, the sludge concentration in the Aerobic Pond is controlled to be 2-4g/L.
4. excess sludge zero release denitrification dephosphorization technique as claimed in claim 3 is characterized in that, effective separation aperture of solid-liquid separation assembly is 0.01 μ m-1mm in the anoxic pond.
5. excess sludge zero release denitrification dephosphorization technique as claimed in claim 3 is characterized in that the nitrification liquid of Aerobic Pond is back to anoxic pond, and reflux ratio is 10%-900%.
6. excess sludge zero release denitrification dephosphorization technique as claimed in claim 3 is characterized in that the return sludge ratio of Aerobic Pond to anaerobic pond is 10%-600%.
7. claim 1 excess sludge zero release denitrification dephosphorization apparatus; It is characterized in that; Aerobic Pond after comprising successively anaerobic pond, the anoxic pond through pipe connection and being connected in anoxic pond wherein also has pipe connection that the chemical dephosphorization device is arranged in addition between anaerobic pond and anoxic pond; Be provided with the solid-liquid separation assembly in the described anoxic pond, also be provided with sludge return pipe between Aerobic Pond and anaerobic pond.
8. excess sludge zero release denitrification dephosphorization apparatus as claimed in claim 7 is characterized in that, effective separation aperture of the solid-liquid separation assembly of establishing in the anoxic pond is 0.01 μ m-1mm.
9. excess sludge zero release denitrification dephosphorization apparatus as claimed in claim 7 is characterized in that, anoxic pond and Aerobic Pond are provided with separately or merge and be provided with; When both were provided with separately, Aerobic Pond was provided with the nitrification liquid reflux and is connected to anoxic pond.
10. excess sludge zero release denitrification dephosphorization apparatus as claimed in claim 7 is characterized in that, is provided with equipment for separating liquid from solid in the Aerobic Pond or is provided with settling tank outward.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104230092A (en) * | 2013-06-07 | 2014-12-24 | 湖南永清环保研究院有限责任公司 | Technological system for urban domestic sewage treatment and synchronous sludge reduction near-zero emission |
| CN104891754A (en) * | 2015-07-09 | 2015-09-09 | 王洪臣 | Wastewater treatment process and wastewater treatment system |
| CN105565618A (en) * | 2016-03-22 | 2016-05-11 | 深圳市盘古环保科技有限公司 | High-efficiency sewage treatment method by denitrification and dephosphorization |
| CN105601056A (en) * | 2016-03-22 | 2016-05-25 | 深圳市盘古环保科技有限公司 | Sewage treatment method with enhanced denitrification and dephosphorization functions |
| CN106865906A (en) * | 2017-03-30 | 2017-06-20 | 东北师范大学 | A kind of sewage-treatment plant and operating method for improving low temperature urban sewage purification effect |
| CN107500472A (en) * | 2017-09-05 | 2017-12-22 | 成都锐达机电实业有限公司 | High efficiency dephosphorating technique |
| CN108002665A (en) * | 2018-01-12 | 2018-05-08 | 北京环科宏力环境科技有限公司 | Sewage-treatment plant and sewage disposal system |
| CN110040914A (en) * | 2019-05-20 | 2019-07-23 | 北京市高速公路交通工程有限公司 | A kind of sewage disposal device and treatment process for domestic sewage denitrifying-dephosphorizing |
| CN110127941A (en) * | 2019-05-20 | 2019-08-16 | 北京市高速公路交通工程有限公司 | A kind of biological and chemical method coupling denitrification dephosphorization technique and processing equipment |
| CN115490352A (en) * | 2021-06-20 | 2022-12-20 | 高峰 | Process for improving discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104230092A (en) * | 2013-06-07 | 2014-12-24 | 湖南永清环保研究院有限责任公司 | Technological system for urban domestic sewage treatment and synchronous sludge reduction near-zero emission |
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| CN105601056A (en) * | 2016-03-22 | 2016-05-25 | 深圳市盘古环保科技有限公司 | Sewage treatment method with enhanced denitrification and dephosphorization functions |
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| CN110040914A (en) * | 2019-05-20 | 2019-07-23 | 北京市高速公路交通工程有限公司 | A kind of sewage disposal device and treatment process for domestic sewage denitrifying-dephosphorizing |
| CN110127941A (en) * | 2019-05-20 | 2019-08-16 | 北京市高速公路交通工程有限公司 | A kind of biological and chemical method coupling denitrification dephosphorization technique and processing equipment |
| CN115490352A (en) * | 2021-06-20 | 2022-12-20 | 高峰 | Process for improving discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage |
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Application publication date: 20120801 |