CN100337933C - City sewage treating process and system - Google Patents
City sewage treating process and system Download PDFInfo
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- CN100337933C CN100337933C CNB2004100275034A CN200410027503A CN100337933C CN 100337933 C CN100337933 C CN 100337933C CN B2004100275034 A CNB2004100275034 A CN B2004100275034A CN 200410027503 A CN200410027503 A CN 200410027503A CN 100337933 C CN100337933 C CN 100337933C
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Abstract
The present invention discloses a city sewage treating method and a system thereof. In the city sewage treating method, after large amounts of suspended matters and floating matters in the city sewage are trapped and removed by a coarse grid and a middle grid, the city sewage needs to be treated in the following procedures: a. adding a flocculating agent before the sewage flows in a water collecting pump room, b. adding a coagulant aid after the sewage flows out of the water collecting pump room, c. entering a hybrid reaction grit tank, d. entering a sedimentation tank for solid-liquid separation, e. entering a nitrification tank and a denitrification tank, and f. entering a sand filtering tank and discharging water. The present invention has the aim of proving a city sewage treating method in which the city sewage formed by mixing industrial sewage with low biochemical coefficients (BOD/COD in the range of 0.3 to 0.15) and domestic sewage can be treated, nitrogen and phosphorus can be removed simultaneously, and hydraulic retention time is short, and the process flow of the treatment is short; the management is simple, and the occupation area of the present invention is approximately 40 percent as that of a conventional city sewage treating process.
Description
Technical field
The present invention relates to a kind of method for the treatment of city waste water and system, particularly a kind of processing is can biochemical coefficient low, hydraulic detention time is short sewage water treatment method and system.
Background technology
China just belonged to resource lack of water country in the world originally, 1/4 of per capita used water inadequate resource world average, and distributed pole is inhomogeneous, along with rapid economy development in recent decades, the water shortage problem in the most cities of China becomes increasingly conspicuous, lack of water has become the bottleneck problem of a lot of urban economy sustainable developments of restriction.Meanwhile, because the exploitation of the water pollution control mode and the technology of improvement, the input of treatment facility all relatively lag behind, make most of municipal effluents without just directly discharging of any processing, the sewage that is discharged has made nearly river, lake, ocean more than 85 percent all be subjected to pollution in various degree.Because the severe contamination of water body, a lot of resourceful southern cities of water past also face the crisis of water quality type lack of water at present.And a lot of cities, the north are subjected to the dual puzzlement of resource-type lack of water and water quality type lack of water.
At present, the method for the treatment of city waste water that generally adopts both at home and abroad is the biochemical processing method that is derived by activated sludge process, for example A
2/ O (biological dephosphorization denitrogenation synchronously) method, various oxidation ditch process, various SBR method, carrier activated sludge process, integrated activated sludge processing, A/O (anaerobic-aerobic activated sludge process) or the like, above-mentioned all kinds of sewage treatment all belongs to the underload facture, is used widely in developed country.It is fully passable bearing such consumption (sewage disposal is actual to be a kind of consumption) level for developed country.These method ultimate principles are consistent with conventional activated sludge process, but its characteristics and application conditions are respectively arranged, and using also is that conditions such as water quality, the water yield, receiving water body, weather, environment according to the each place are selected.For example north cold area sewage disposal in winter biological bacteria survival, procreation difficulty, the problem that can't normally move often appears in the sewage work of prior art.The so populous developing country of China, municipal effluent often contain industries such as a large amount of plating, electronics, chemical industry, printing and dyeing, process hides waste water and with the mixed sewage of city domestic sewage, the obvious characteristic of this class sewage is exactly that biodegradability is poor, can biochemical coefficient BOD/COD＜0.3.And the soil that sewage work need occupy a large amount of cultivated areas puzzled too governments at all levels, especially big and medium-sized cities is an inch of land is an inch of gold especially, uses the national conditions that obviously are not suitable for China with developed country same underload facture.Therefore produce that a lot of sewage works afford to build and present situation that can not move.Need better method can take ground less at present, can carry out sewage disposal cost-effectively at the practical situation of China's municipal effluent again.
Summary of the invention
The purpose of this invention is to provide a kind of method for the treatment of city waste water, this method can handle can biochemical coefficient lower (the BOD/COD scope is 0.3～0.15) trade effluent and the municipal effluent of sanitary sewage after mixed, hydraulic detention time is short, and can the while dephosphorization denitrogenation.
Another object of the present invention provides the Sewage treatment systems that a kind of available this method is carried out sewage disposal.
For realizing purpose of the present invention, the present invention proposes a kind of municipal effluent integrated conduct method: municipal effluent through coarse rack and middle grid hold back removed big outstanding, floating matter after, also to pass through following steps successively:
It is characterized in that also will passing through following steps successively:
A adds flocculation agent before sewage flows into the water collecting pump room,
B adds coagulant aids after sewage flows out the water collecting pump room,
C enters the hybrid reaction sedimentation basin: carries out the thorough mixing reaction, forms good alumen ustum,
D enters settling tank: carry out solid-liquid separation, mud separates with supernatant liquor at the bottom of sinking to the pond,
E enters nitrification tank and denitrification pond: in nitrification tank and denitrification pond, add biotechnological formulation respectively clearing up the organic pollutant in the sewage,
F enters sand filter: the microbial film that comes off in the filtering biochemical treatment process, water outlet then.
In the method for the invention, through coarse rack and middle grid hold back removed big outstanding, floating matter after municipal effluent flow into the pump house that catchments by pipeline, before lift pump, add flocculation agent, impeller by lift pump tentatively stirs flocculation agent and sewage, behind lift pump, add coagulant aids, processed municipal effluent flows through mixed reaction pond and carries out the good alumen ustum of thorough mixing reaction formation, and the reaction times flowed into settling tank then at 3～30 minutes.Method preferred version of the present invention is the hybrid reaction of carrying out step c after the sewage process fine fack filtration of passing through after step b adds coagulant aids earlier again.
Sewage residence time in settling tank was finished solid-liquid separation in the steps d at 30～80 minutes, make most pollutents in settling tank, be formed mud through this step by flocculation sediment, can remove in the sewage 70～75% COD, 65～70% BOD, 90～95% SS, 93～96% wild bacterium, germ, virus, 99% heavy metal, the moisture percentage in sewage sludge of post precipitation are about 97%.Supernatant liquor after materialization is handled, BOD5 can improve about 30%, and BOD/COD ratio (can biochemical coefficient) is also brought up to more than 0.4 by about 0.16 of former water, makes the sewage can be biochemical by can not biochemistry changing into.The supernatant liquor of settling tank can successively flow into the nitrification and denitrification pond and further clear up organic pollutant in the sewage.
In nitrification tank and denitrification pond, add corresponding biotechnological formulation respectively, biotechnological formulation is to contain photosynthetic bacteria, yeast, anerobe, aerobic bacteria, the nearly hundred kinds of floras that mushroom is formed such as oxygen bacterium, nitrifier, denitrifying bacteria of holding concurrently, and the formation dominant microflora is screened, tames, cultivated to these floras processes meticulously.Dominant microflora forms the microbial film of enormous amount on filler, when the organic pollutant in the sewage is cleared up by flora during by these microbial films, the microbial film that flora generated owing to not only have superiority in nitrification tank and the denitrification pond, but also with the numerous aquatic animals and plants of kind, formed good ecological circulation system in the pond, this system forms a complete food chain.Through the biochemical treatment in nitrification and denitrification pond, tail water reaches the permission discharge index.
Because through also containing some greasy dirt in the supernatant liquor behind the steps d settling tank, and grease can produce the gas shield effect to flora in the microbial film, thereby cause between sewage and the mycoderm and form screen layer, and then cause flora death, influence the effect of biochemical treatment, so method preferred version of the present invention is to carry out step e again through after the oil removal treatment earlier through the sewage supernatant liquor after the steps d.The oil removing scheme is adopted as the oil removal by air bubbling method.Successively enter nitrification tank and denitrification pond again through the supernatant liquor behind the oil removal by air bubbling pond, the tail water clean effect that obtains is desirable more.
Because the tail water through biochemical treatment might go out biochemical treatment system with micro-aged biological film zone, flora has produced mutation in this system, for preventing the generation biological pollution of tail water to receiving water body, sand filter is set behind biochemical treatment system.The inventive method is further preferred, will enter the disinfection by ultraviolet light pond through the water that step (6) sand filter purifies and kill water outlet again behind the residual microorganism.
For realizing another object of the present invention, design a kind of urban sewage treatment system, comprise coarse rack, middle grid, the pump house that catchments, hybrid reaction settling pit, settling tank, nitrification tank, denitrification pond and sand filter, they link to each other successively by sewer line, wherein before sewage enters the pump house that catchments and sewage enter on the pipeline before the hybrid reaction settling pit, respectively be provided with a volume pump, be respectively applied for and add flocculation agent and coagulant aids.
The optional horizontal sedimentation tank of wherein said settling tank, inclined-plate clarifying basin, radial flow settling basin or tube settler etc., preferred tube settler.The sand fineness scope of sand filter is at (0.5～1.0 millimeter).
The preferred version of urban sewage treatment system of the present invention comprises also fine fack is set that described fine fack places between pump house and the hybrid reaction settling pit.
In order to improve the effect of biochemical treatment, urban sewage treatment system of the present invention also is provided with grease removal tank between settling tank and nitrification tank, described grease removal tank water-in is by pipe connection settling tank water outlet, and described grease removal tank water outlet is by the water-in of pipe connection nitrification tank.Grease removal tank is the oil removal by air bubbling pond that is provided with air-dissolving apparatus, produce micro-bubble by air-dissolving apparatus (as pressure air-dissolving method, the broken gas method of rotor, micropore gas distribution method, electrolysis-coagulation air supporting method, chemical air supporting method, turbine air flotation method, the heterogeneous air dissolved pump method of gas-liquid or the like) and inject processed sewage, when bubble is overflowed from sewage, absorption wet goods lightweight pollutent reaches the purpose except that oil purification.
Sewage treatment systems of the present invention also preferably includes the disinfection by ultraviolet light pond, and the water-in in described disinfection by ultraviolet light pond connects the water outlet of sand filter by pipe duct.
Municipal effluent total system of the present invention, consider the back flushing unit of sand filter, also can preferably include clean water basin, backwashing pump and a Buffer Pool, tail water water outlet pipe duct after the water-in of described clean water basin purifies by the pipe duct connection, clean water basin, backwashing pump, sand filter and Buffer Pool link to each other successively through pipe duct, the water outlet of Buffer Pool links to each other with pump house by pipe valve, makes the recoil sewage of sand filter not cause load impact to processed sewage in the pump house.
Beneficial effect of the present invention is as follows:
1 municipal effluent is through behind the materialization treatment process of the present invention, and most pollutents in settling tank, have been reduced the load of follow-up biochemical treatment by flocculation sediment, energy-conservation reaching more than 60%;
Supernatant liquor after 2 materializations are handled, BOD5 can improve about 30%, BOD/COD ratio (can biochemical coefficient) is also brought up to more than 0.4 by about 0.16 of former water, make the sewage can be biochemical by can not biochemistry changing into, the security of the effect of biochemical treatment, efficient and biochemical system all is improved, and shock-resistant ability also improves thereupon;
The hydraulic detention time of 3 urban sewage treatment process of the present invention is short, and processing technological flow is short, and simple and convenient management, floor space only need about 40% of conventional urban sewage treatment process, also can save construction investment about 30%;
The problem that 4 the present invention can solve present north cold area sewage disposal in winter biological bacteria survival, procreation is difficult and cause sewage work normally to move, because materialization of the present invention is handled and can be removed most pollutents in the municipal effluent (and materialization is handled and is subjected to the factor of climatic influences less, the effect that the materialization in winter is handled can be better, because the pedesis of water molecules reduces.), relatively low by the load of biochemical treatment, and, just might take the insulation measure to sewage treatment structure because hydraulic detention time is short, to reduce the loss of water temperature in the treatment process process in municipal sewage treatment in the winter process;
Description of drawings
Fig. 1 is the process flow sheet of urban sewage treatment system one preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing,, will make technical scheme of the present invention and other beneficial effect apparent by detailed description to preferred embodiment of the present invention.
In urban sewage treatment system embodiment shown in the drawings, comprise coarse rack 1, middle grid 2, the pump house 3 that catchments, fine fack 15, hybrid reaction settling pit 4, tube settler 5, oil removal by air bubbling pond 6, nitrification tank 7, denitrification pond 8, sand filter 9 and disinfection by ultraviolet light pond 10, they link to each other successively by sewer line, before sewage enters the pump house 3 that catchments and sewage enter on the pipeline before the fine fack 15, respectively be provided with a volume pump 11 and volume pump 12, be respectively applied for and add flocculation agent and coagulant aids.
Wherein, oil removal by air bubbling pond 6 is provided with air-dissolving apparatus 16; Nitrification tank 7 is provided with gas blower 17; Volume pump 13 is connected nitrification tank 7 and denitrification pond 8 respectively with volume pump 14.
In this embodiment, be provided with clean water basin 18, backwashing pump 19 and Buffer Pool 20, the water-in of clean water basin 18 is by the outlet conduit in pipe connection disinfection by ultraviolet light pond, clean water basin 18, backwashing pump 19, sand filter 9 and Buffer Pool 20 link to each other successively through pipeline, and the water outlet of Buffer Pool 20 flows back to the pump house 3 that catchments by the pipeline recoil sewage that makes sand filter 9 that links to each other with the pump house 3 that catchments through Buffer Pool 20.
In this embodiment, also comprise the grit water separator 21 that links to each other with hybrid reaction settling pit 4, and the sludge thickener 22 and the high pressure slurry pump 22 that are used for the mud aftertreatment, the mud mouth of this system's tube settler 5 is connected with sludge thickener 22 by sludge pipe.In addition the oil removal by air bubbling pond 6 greasy dirt pipelines of this system with enter high pressure slurry pump 22 before sludge pipe be connected.
The municipal effluent coarse rack 1 of flowing through earlier, after middle grid 2 filters, volume pump 11 pumps into a certain amount of flocculation agent (as the aluminium saline flocculating agent) in the sewage, impeller by pump house 3 lift pumps that catchment tentatively stirs flocculation agent and sewage, behind lift pump, add coagulant aids (as polyacrylamide) again by volume pump 12, two kinds of liquid and sewage form the good alumen ustum of sedimentation function through thorough mixing reaction back in hybrid reaction settling pit 4, after about 3～5 minutes of reaction times, flow into the solid-liquid separation that 5 residence time of tube settler carried out at 30～40 minutes again, the moisture percentage in sewage sludge of post precipitation only is about 97%, can carry out the mud aftertreatment.Supernatant liquor flows into oil removal by air bubbling pond 6 earlier and carries out oil removal treatment, about 10～20 minutes of time, flow into nitrification tank 7 and denitrification pond 8 again and further clear up organic pollutant in the sewage, add in nitrification tank 7 and denitrification pond 8 by volume pump 13 and volume pump 14 respectively and contain photosynthetic bacteria, yeast, anerobe, aerobic bacteria, the nearly hundred kinds of dominant microfloras that mushroom is formed such as oxygen bacterium, nitrifier, denitrifying bacteria of holding concurrently accordingly.On filler, form the microbial film of enormous amount.
Tail water enters sand filter 9 behind biochemical treatment system, the microbial film that removal comes off, reduce the content of SS in the tail water, the water that purifies through sand filter 9 passes through disinfection by ultraviolet light pond 10 again, and the tail water discharging reaches primary standard among " urban wastewater treatment firm pollutant emission standard " GB18918-2002.
Claims (12)
1, a kind of method for the treatment of city waste water, municipal effluent through coarse rack and middle grid hold back removed big outstanding, floating matter after, it is characterized in that also will passing through following steps successively:
A adds flocculation agent before sewage flows into the water collecting pump room,
B adds coagulant aids after sewage flows out the water collecting pump room,
C enters the hybrid reaction sedimentation basin: carries out the thorough mixing reaction, forms good alumen ustum,
D enters settling tank: carry out solid-liquid separation, mud separates with supernatant liquor at the bottom of sinking to the pond,
E enters nitrification tank and denitrification pond: in nitrification tank and denitrification pond, add biotechnological formulation respectively with the organic pollutant in the degradation of sewage,
F enters sand filter: the microbial film that comes off in the filtering biochemical treatment process, water outlet then.
2, method for the treatment of city waste water according to claim 1 wherein also comprises: the sewage after described process step f purifies enters the disinfection by ultraviolet light pond, kills the microorganism that remains in the water, and then water outlet.
3, method for the treatment of city waste water according to claim 1 wherein also comprises: described through carrying out step c again after the process fine fack filtration of the elder generation of the sewage behind the step b.
4, method for the treatment of city waste water according to claim 1 wherein also comprises: described through carrying out step e again after the elder generation of the supernatant liquor after the steps d process oil removal treatment.
5, method for the treatment of city waste water according to claim 4, wherein said oil removal treatment method is the oil removal by air bubbling method.
6, a kind of urban sewage treatment system, comprise coarse rack, middle grid, the pump house that catchments, hybrid reaction settling pit, settling tank, nitrification tank, denitrification pond and sand filter, they link to each other successively by sewer line, it is characterized in that: before sewage enters the pump house that catchments and sewage enter on the pipeline before the hybrid reaction settling pit, respectively be provided with a volume pump, be respectively applied for and add flocculation agent and coagulant aids.
7, urban sewage treatment system according to claim 6 wherein also comprises: the disinfection by ultraviolet light pond, the water-in in described disinfection by ultraviolet light pond links to each other with the water outlet of sand filter by pipeline.
8, urban sewage treatment system according to claim 6, also being included in catchments is provided with fine fack between pump house and the hybrid reaction settling pit.
9, urban sewage treatment system according to claim 6, also be included between settling tank and the nitrification tank grease removal tank is set, described grease removal tank water-in is by pipe connection settling tank water outlet, and described grease removal tank water outlet is by the water-in of pipe connection nitrification tank.
10, urban sewage treatment system according to claim 6, described settling tank are tube settler.
11, urban sewage treatment system according to claim 9, described grease removal tank are the oil removal by air bubbling pond that is provided with air-dissolving apparatus.
12, urban sewage treatment system according to claim 6, also comprise and be provided with clean water basin, backwashing pump and Buffer Pool, sewage outlet conduit after described clean water basin water-in purifies by pipe connection, the clean water basin water outlet links to each other with backwashing pump, sand filter and Buffer Pool successively through pipeline, and the water outlet of Buffer Pool links to each other with the pump house that catchments through pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100275034A CN100337933C (en) | 2004-06-09 | 2004-06-09 | City sewage treating process and system |
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| CNB2004100275034A CN100337933C (en) | 2004-06-09 | 2004-06-09 | City sewage treating process and system |
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| CN1706760A CN1706760A (en) | 2005-12-14 |
| CN100337933C true CN100337933C (en) | 2007-09-19 |
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| CNB2004100275034A Expired - Fee Related CN100337933C (en) | 2004-06-09 | 2004-06-09 | City sewage treating process and system |
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| CN102050546A (en) * | 2009-11-04 | 2011-05-11 | 大亚有限公司 | Method and device for comprehensive treatment of domestic sewage and organic waste |
| CN102139994B (en) * | 2011-02-12 | 2012-10-10 | 河海大学 | Method for enhanced purification of water quality of standard-reaching tail water in town sewage plant |
| CN102491599B (en) * | 2011-12-16 | 2013-05-08 | 铁道第三勘察设计院集团有限公司 | Domestic sewage integrated-treatment method |
| CN102910771B (en) * | 2012-11-07 | 2015-04-15 | 江苏龙腾工程设计有限公司 | Treatment method for high-concentration phosphorous waste water |
| CN103086539A (en) * | 2013-01-21 | 2013-05-08 | 北京市环境保护科学研究院 | Solid-liquid separating device and method of concentrated liquid waste from banknote printing wiping |
| CN103224309B (en) * | 2013-04-25 | 2014-06-25 | 西华大学 | Leather waste water treatment system and treatment process |
| CN103819049B (en) * | 2013-12-23 | 2016-06-29 | 桑德集团有限公司 | A kind of sewage water treatment method and system |
| CN104891616A (en) * | 2015-05-28 | 2015-09-09 | 中国石油化工股份有限公司 | Oily wastewater purification method and system |
| CN105084594A (en) * | 2015-08-20 | 2015-11-25 | 孙源 | Urban sewage treatment method |
| CN105621792B (en) * | 2015-12-30 | 2018-09-18 | 北京河海清源环保科技有限公司 | City river sewage draining exit sewage water treatment method and processing equipment |
| CN106007241A (en) * | 2016-07-21 | 2016-10-12 | 罗志明 | Novel urban pipeline sewage treatment method |
| CN108479190A (en) * | 2018-06-13 | 2018-09-04 | 南京圣卡孚科技有限公司 | A kind of continuous floating bed filtering settled sand filter unit and application method |
| CN111596021B (en) * | 2020-05-26 | 2022-02-11 | 同济大学 | Water body carbon source quality evaluation method, equipment and device and readable storage medium |
| RU2747950C1 (en) * | 2020-08-26 | 2021-05-17 | Публичное акционерное общество "Транснефть" (ПАО "Транснефть") | Technological line for purification of mixed industrial-rain and household wastewater |
| CN112520941A (en) * | 2020-11-19 | 2021-03-19 | 中国市政工程华北设计研究总院有限公司 | Switchable efficient sewage purification treatment system coupled by physicochemical biological membranes |
| CN114933398B (en) * | 2022-06-15 | 2023-11-14 | 国晟生态环境科技有限公司 | Advanced denitrification and dephosphorization and safe disinfection method for urban sewage and application thereof |
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| CN1412134A (en) * | 2002-12-13 | 2003-04-23 | 南开大学 | Urban domestic sewage treatment process and its method |
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| US4780208A (en) * | 1986-08-29 | 1988-10-25 | Botho Bohnke | Process for purification of effluent |
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| CN1412134A (en) * | 2002-12-13 | 2003-04-23 | 南开大学 | Urban domestic sewage treatment process and its method |
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