CN1194910C - Improved oxidation channel city sewage treamtent process - Google Patents
Improved oxidation channel city sewage treamtent process Download PDFInfo
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- CN1194910C CN1194910C CNB01108880XA CN01108880A CN1194910C CN 1194910 C CN1194910 C CN 1194910C CN B01108880X A CNB01108880X A CN B01108880XA CN 01108880 A CN01108880 A CN 01108880A CN 1194910 C CN1194910 C CN 1194910C
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- improved oxidation
- oxidation ditch
- settling tank
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Abstract
The present invention relates to an urban sewage treatment process using an improved oxidation channel, which has the advantages of less land occupation, low investment, low operation cost, high efficiency of phosphorus removal and convenient management. The present invention is characterized in that a sand settling tank is a vortex sand settling tank; reflux sludge is treated in an anaerobic mode for 1 to 2 hours before returning to an oxidation channel; the improved oxidation channel has the design parameters comprising the sludge age of 10 to 15 days and the sludge concentration of 4000 to 5000 mg/L, and the water outlet of the improved oxidation channel is arranged in an oxygen-enriched area at the downstream part of an aerator or an independently-arranged strengthening aeration area; water is supplied and discharged from the periphery of a settling tank; a sludge concentration tank is removed; and residual sludge is concentrated and dehydrated by an integrated sludge concentrating and dehydrating machine. The process ensures the improved oxidation channel with more than 87% of phosphorus removing efficiency, and discharged water quality can come up to a primary standard in national sewage comprehensive discharge standards.
Description
Affiliated technical field
The present invention relates to be applicable to has the municipal sewage plant of strict demand and dephosphorization to require tighter geographic improved oxidation channel city sewage treamtent process to dephosphorization denitrogenation.
Technical background
Oxidation ditch has another name called the oxidation canal, gains the name because of its structures become the ring-type irrigation canals and ditches shape of sealing.Be a kind of modification of activated sludge process, be equivalent to the extended aeration system.Because the mixed solution of sewage and active sludge constantly circulates, therefore, not only the people is arranged but also be referred to as " circulated aeration tank ", " aerating system of endless " in the aeration channel.
First municipal sewage plant that adopts oxidation ditch process built at Dutch Fu Xiaoding in 1954.Since the sixties, the oxidation ditch sewage disposal technology obtains promotion and application rapidly on Europe, North America, South America and Australia and other places, and its technology and structure have all had bigger development, become the urban sewage treatment process of current tool vitality.By the reasonable Arrangement of aerator, on runner, form the AO technology of a plurality of polyphones in the oxidation ditch, reach the purpose of removing carbon source pollutent and nitrogen.
Oxidation ditch water technology of the prior art exists the long defective of sludge age, owing to before mud refluxes, do not pass through anaerobic treatment, so phosphor-removing effect is relatively poor, and only about 50%.In addition, also there are deficiencies such as construction costs height, floor space be big in whole technology.
The content of invention
Technical problem to be solved by this invention provide a kind of have take up an area of province, less investment, working cost is low, dephosphorization efficiency by using is high, the improved oxidation channel city sewage treamtent process of convenient management.
It is such that the present invention solves the problems of the technologies described above the technical scheme that is adopted, and promptly comprises following processing step:
1, fine fack removes the floating matter in the decontaminated water;
2, wastewater level is brought up to design height, be the head height that the gravity flow that guarantees water in the subsequent technique provides;
3, sand setting precipitation;
4, oxidation ditch is removed carbon source pollutent in the water and nitrogen element and the phosphoric that causes body eutrophication;
5, settling tank carries out mud-water separation;
Feature of the present invention is:
1, the eddy current settling pit is adopted in the sand pond;
2, enter anaerobic pond together from the sewage of eddy current sedimentation basin with from the returned sluge of settling tank, carry out 1～2 hour anaerobic treatment;
3, the water outlet of anaerobic pond enters improved oxidation ditch, on the runner of improved oxidation ditch aerator is set; The improved oxidation ditch design variable is: sludge age 10～15 days, sludge concentration 4000～5000mg/L;
4, the improved oxidation ditch water outlet is arranged on the oxygen-rich area in aerator downstream or the enhanced aeration district that is provided with separately;
5, settling tank adopts circumferential water feed peripheral effluent pond type;
6, the cancellation sludge thickener adopts integrated sludge concentration and dewatering machine that excess sludge is concentrated and dewaters.
The present invention has reduced the reoxygenation in the water inlet owing to adopted the eddy current settling pit; Because returned sluge had carried out anaerobic treatment before returning oxidation ditch, can make the phosphorus in the subsequent handling obtain the excess absorption; Owing to shortened the sludge age of oxidation ditch, it is low to make sewage treatment facility take up an area of province, less investment, working cost; Owing to adopt all borders water peripheral effluent type settling tank, shortened the drain time of excess sludge, improved the dephosphorizing rate of whole technology; Owing to adopt integrated sludge concentration and dewatering machine that excess sludge is concentrated and dewater, reduced the concentration of phosphorus in the supernatant liquor, that has improved whole technology goes out phosphorus efficient.
(4), the description of the drawings
The present invention has following accompanying drawing:
Accompanying drawing 1 is a process flow sheet of the present invention;
Accompanying drawing 2 is the orthographic plan of the improved oxidation ditch that adopts in the technology of the present invention;
Accompanying drawing 3 is the sectional structure chart of the peripheral well water peripheral effluent settling tank that adopts in the technology of the present invention.
Referring to accompanying drawing 2,3, the 1-water-in among the figure, 2-returned sluge mud inlet, 3-anaerobic pond, 4-diversion trench, 5-aerator, 6-improved oxidation ditch, 7-water-in, 8-peripheral effluent groove, 9-inhale mud scraper, 10-mud discharging pipe, 11-circumferential water feed groove.
(5), embodiment
The specific embodiment of the present invention is further specified by accompanying drawing: referring to accompanying drawing 1: the processing step among the figure is:
(1) thick, fine fack
Slightly, fine fack is first procedure in the improved oxidation channel city sewage treamtent process.Its function is with the bulk in the water inlet and the floating matter of fritter, as plastics bag, branch, cardboard etc., salvages from sewage, stops these floating matters to enter follow-up lifting pumping plant, damages water pump.
(2), sewage pump station
The sewage pump station is the second operation work in the improved oxidation channel city sewage treamtent process.Its function is that sewage is risen to design height, for the gravity flow of water in the subsequent technique provides head height.
(3), eddy current settling pit
The eddy current settling pit is the three process in the improved oxidation channel city sewage treamtent process.Its function be with settling property in the sewage preferably silt particle separate, reduce the amount of the inorganic silt particle enter oxidation ditch, be beneficial to the normal operation of oxidation ditch.Sedimentary silt particle effluxes after dewatering through grit water separator.
(4) anaerobic pond
Anaerobic pond is the 4th procedure in the improved oxidation channel city sewage treamtent process.Sewage from the eddy current settling pit enters anaerobic pond with the returnedactivatedsludge (being the microorganism cenobium) from mud backflow well, mixes in the pond and reacts.Its major function has two: the one, and biological selective action the disadvantageous bacterium of subsequent disposal is suppressed in this breeding, and the needed bacterium of follow-up processing is bred in a large number, becomes dominant microflora; Second effect is that the phosphorus of releasing for polyP bacteria provides place and envrionment conditions, and the polyP bacteria in the active sludge discharges intravital phosphorus at this, for the excess of phosphorus in the subsequent handling absorbs ready.Hydraulic detention time is 1～2 hour.
(5) improved oxidation ditch
Oxidation ditch is the five processes in the improved oxidation channel city sewage treamtent process.Its function is to remove carbon source pollutent in the water and nitrogen element and the phosphoric that causes body eutrophication.On the runner of oxidation ditch,, form anoxic by aerator rationally is set---the denitrification process that aerobic cycle alternation is arranged; Simultaneously, the anaerobic pond of aerobic section on the runner and the 4th procedure is formed anaerobism---aerobic dephosphorization process, thereby, constituted the A of improved oxidation ditch on the whole
2O denitrogenation dephosphorizing mechanism.The oxidation ditch water outlet is arranged on the oxygen-rich area in aerator downstream or the enhanced aeration district that is provided with separately, and the effect that makes polyP bacteria inhale phosphorus is further strengthened.The improved oxidation ditch pond makes that deeply than other ditch moldeed depth ditch body floor space is little, is fit to very much the area of city public land anxiety.In addition, the architectural image of oxidation ditch is more flexible, can the building exterior design be become various succinct, graceful forms, the dual function of play environment purification, beautifying the environment according to technology and environment requirements.Hydraulic detention time is 10～13 hours, sludge age 10～15 days, sludge concentration 4000～5000mg/L.
(6), settling tank
Settling tank is the 6th procedure in the improved oxidation channel city sewage treamtent process.Its function is to carry out mud-water separation, and the moisture of active sludge and processing is left, and active sludge enters sewer catch basin, the clear water standard discharge.The operation scheme of circumferential water feed, peripheral effluent is adopted in design, and efficient improves more than the twice than the radical sedimentation basin efficient of center water inlet peripheral effluent, and the floor space of settling tank is reduced significantly, has saved and has taken up an area of and investment.
(7), returned sluge pumping plant
The effect of returned sluge pumping plant is quantity of reflux and the quantity discharged by the control active sludge, realizes the control to sludge concentration in the oxidation ditch and sludge age.Active sludge part from settling tank is transported to anaerobic pond by return sludge pump, and near the excess sludge pumping plant another part then flows into becomes excess sludge.
(8) excess sludge pumping plant
The effect of excess sludge pumping plant is excess sludge to be transported to by residual sludge pump concentrate between sludge dewatering and dewater.
(9), integrated mud concentrates/water extracter
The effect of integrated sludge concentration and dewatering machine is that the excess sludge that will discharge concentrates, dehydration.Compare with sludge thickener, adopt the residence time before integrated sludge concentration and dewatering machine has shortened sludge dewatering, reduced the release of phosphoric, thereby the dephosphorization efficiency by using of entire treatment technology is improved.
Above-mentioned technology effluent quality reaches the primary standard in country's " composite wastewater emission standard ", and the clearance of phosphorus reaches more than 87%.
Referring to accompanying drawing 2, water-in 1 is communicated with settling pit with anaerobic pond 3, establish underwater propeller in the anaerobic pond, promotes flow and returned sluge is mixed with intaking.The water outlet of anaerobic pond enters oxidation ditch 6 in the anoxic section of oxidation ditch by pipeline or weir gate; The cross section of improved oxidation ditch 6 is a rectangle, and head and the tail are connected in series between the raceway groove, form a closed system, the control of effluent adopting weir gate; Inherent bend of ditch and aerator 5 downstreams are provided with training wall 4, and effect is to prevent that active sludge from separating with the aerator downstream at the bend place with sewage, influences treatment effect; Be provided with inversed umbrella type frequency conversion surface aerating machine at the raceway groove turning, can be according to the concentration adjustment speed of oxygen in water, the control oxygenation capacity.Also can adopt other aerators, add impeller etc., but the position on runner changes according to design requirements as plate-spinning, blast aeration.
Referring to accompanying drawing 3, precipitation pool with peripheral is cylindrical, and the centre is provided with inhales mud scraper 9, and the suction mud scraper is pooled to the mud at the bottom of the pond mud discharging pipe 10 at center, pond mud is discharged in rotary course.Cisterna ambiens wall inboard is provided with peripheral distributing trough 11, and water inlet 7 enters settling tank by distributing trough along the uniformly distributing of pool wall circumference.In settling tank, mud and water are realized mud-water separation, and mud sinks at the bottom of the pond, and clear water is then by emitting along the inboard peripheral effluent groove 8 that is provided with of peripheral distributing trough.
Claims (3)
1, a kind of improved oxidation channel city sewage treamtent process, sewage carry out according to the following steps successively in proper order:
(1), adopt thick, fine fack to remove the floating matter in the decontaminated water;
(2), wastewater level is brought up to design height, be the head height that the gravity flow that guarantees water in the subsequent technique provides;
(3), sand setting precipitation;
(4), oxidation ditch is removed carbon source pollutent in the water and nitrogen element and the phosphoric that causes body eutrophication;
(5), settling tank carries out mud-water separation;
Feature of the present invention is:
A. settling pit adopts the eddy current settling pit; B. enter anaerobic pond together from the sewage of eddy current sedimentation basin with from the returned sluge of settling tank, carry out 1～2 hour anaerobic treatment; C. the water outlet of anaerobic pond enters improved oxidation ditch, on the runner of improved oxidation ditch aerator is set; The improved oxidation ditch design variable is: sludge age 10～15 days, sludge concentration 4000～5000mg/L; D. the improved oxidation ditch water outlet is arranged on the oxygen-rich area in aerator downstream or the enhanced aeration district that is provided with separately; E. settling tank adopts circumferential water feed peripheral effluent pond type; F. cancel sludge thickener, adopt integrated sludge concentration and dewatering machine that excess sludge is concentrated and dewater.
2, improved oxidation channel city sewage treamtent process according to claim 1 is characterized in that: water-in (1) is communicated with settling pit with anaerobic pond (3), establish underwater propeller in the anaerobic pond; The water outlet of anaerobic pond enters oxidation ditch (6) in the anoxic section of oxidation ditch by pipeline or weir gate; The cross section of improved oxidation ditch (6) is a rectangle, and head and the tail are connected in series between the raceway groove, form a closed system, the control of effluent adopting weir gate; Inherent bend of ditch and aerator (5) downstream are provided with training wall (4).
3, improved oxidation channel city sewage treamtent process according to claim 1, it is characterized in that: precipitation pool with peripheral is cylindrical, the centre is provided with inhales mud scraper (9), cisterna ambiens wall inboard is provided with peripheral distributing trough (11), and water inlet enters settling tank by distributing trough along the uniformly distributing of pool wall circumference by water-in (7); Clear water is then by emitting along the inboard peripheral effluent groove (8) that is provided with of peripheral distributing trough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01108880XA CN1194910C (en) | 2001-09-21 | 2001-09-21 | Improved oxidation channel city sewage treamtent process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01108880XA CN1194910C (en) | 2001-09-21 | 2001-09-21 | Improved oxidation channel city sewage treamtent process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1341569A CN1341569A (en) | 2002-03-27 |
| CN1194910C true CN1194910C (en) | 2005-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB01108880XA Expired - Lifetime CN1194910C (en) | 2001-09-21 | 2001-09-21 | Improved oxidation channel city sewage treamtent process |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294090C (en) * | 2004-03-18 | 2007-01-10 | 昆明柯利欣环保科技有限公司 | High efficiency sewage treatment method |
| CN1303009C (en) * | 2004-09-30 | 2007-03-07 | 中国科学院生态环境研究中心 | Cleaning type integrated effluent disposal system and operation method |
| KR101536392B1 (en) * | 2010-04-26 | 2015-07-14 | 료조 이리에 | Wastewater processing method, system, and method for measuring pollutant-decomposition activity |
| CN101973672B (en) * | 2010-10-18 | 2012-03-28 | 余静 | Zero-energy consumption urban sewage dephosphorization treatment method |
| CN101985383B (en) * | 2010-11-30 | 2012-01-25 | 福州城建设计研究院 | Improved four-ditch type oxidation ditch and sewage treatment method thereof |
| CN102815790B (en) * | 2012-09-19 | 2013-09-11 | 陕西科技大学 | Simulation device and method for oxidation ditch technique |
| CN103951063B (en) * | 2014-05-27 | 2015-04-29 | 广州市市政工程设计研究院 | Energy-saving type treatment device for MBR (membrane biological reactor) oxidation ditch sewage |
| CN104193077B (en) * | 2014-07-25 | 2015-11-04 | 中国环境科学研究院 | A kind of device and method of carrousel oxidation ditch degradation of organic waste water |
| CN104193080B (en) * | 2014-07-25 | 2016-05-04 | 中国环境科学研究院 | A kind of apparatus and method that purify poison sewage |
| CN108946934A (en) * | 2018-08-06 | 2018-12-07 | 昌邑海洋水业有限公司 | The exploitation of biodegradability carbon source and preposition denitrification system |
-
2001
- 2001-09-21 CN CNB01108880XA patent/CN1194910C/en not_active Expired - Lifetime
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| CN1341569A (en) | 2002-03-27 |
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Owner name: CHONGQING KANGDA ENVIRONMENTAL PROTECTION INDUSTRY Free format text: FORMER NAME: CHONGQING KANGDA ENVIRONMENT PROTECTION CO. LTD. |
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Address after: 401121 Chongqing City, northern new hi tech Park Avenue No. 72 A2-6-1 Patentee after: Chongqing Kangda Environmental Protection Industry (Group) Co., Ltd. Address before: 400020, No. 76, Jianxin North Road, Jiangbei District, Chongqing Patentee before: Chongqing Kangda Environment Protection Co., Ltd. |
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Granted publication date: 20050330 |