CN1283562C - System and method for urban sewage chemical-biologic composite deep phosphorous removal - Google Patents
System and method for urban sewage chemical-biologic composite deep phosphorous removal Download PDFInfo
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- CN1283562C CN1283562C CNB200510020129XA CN200510020129A CN1283562C CN 1283562 C CN1283562 C CN 1283562C CN B200510020129X A CNB200510020129X A CN B200510020129XA CN 200510020129 A CN200510020129 A CN 200510020129A CN 1283562 C CN1283562 C CN 1283562C
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Abstract
The present invention discloses a chemical-biologic composite deep phosphorus removal system for municipal sewage and a method thereof, which relates to a system and a method for municipal sewage treatment. The system of the present invention is characterized in that a combined type aeration and sedimentation tank composed of an aeration tank and a secondary sedimentation tank, and a chemical adding device, wherein a grit tank, a primary sedimentation tank and the combined type aeration and sedimentation tank are operated in parallel in two groups. The method of the present invention is characterized in that biological phosphorus removal and chemical flocculation phosphorus removal are combined, so the phosphorus removal and nitrogen removal can be completed in the same aeration tank. Thereby, the system of the present invention has few operating units, compact structure, ground occupation saving, less investment, operation energy consumption saving; the method of the present invention has the characteristics of simple process, high reaction speed, short processing time, visible phosphorus removal effect, etc. The present invention can be widely used for municipal sewage treatment with a large sewage quantity, and the present invention is particularly suitable for being used for treating the sewage with high phosphorus content.
Description
One, technical field
The invention belongs to technical field of sewage, particularly urban sewage treatment system and treatment process.
Two, background technology
Urban sewage treatment process is in mid-term the 1970s and 1980s, and is in the majority with traditional activated sludge process, is object to remove COD (chemical oxygen demand (COD)) mainly, not high to nitrogen, the phosphorus index request of handling in the water outlet of back.In recent years, the cities and towns people generally use washing machine washing clothes etc., use phosphorus containg substances such as washing powder in a large number, and this not only makes the sewage quantity in cities and towns increase, and the phosphorus content in the sewage is increased.Along with the development of society and improving constantly of people's living standard, can be more and more higher to the sewage disposal requirement in cities and towns, to the dephosphorization of sewage disposal, the index strictness day by day of denitrogenation.
Bio-denitrification technology in the existing urban sewage treatment technology generally can both reach the requirement of denitrogenating index, and the biological phosphate-eliminating technology is difficult to reach the requirement of dephosphorization index.Therefore, in municipal sewage treatment, press for the technical problem that solves dephosphorization.Chinese patent CN1410366 discloses a kind of " BICT biological denitrification phosphorous removal technique ", and this waste disposal plant spatially constitutes four main unit with preposition anaerobic reactor, suspension growth main reactor, settling tank and biofilm reactor.The design of the disclosed waste disposal plant of Chinese patent CN2481707 is: one-level aeration tank and one-level settling tank adopt the Round Sump structure; Ingress at one-level aeration tank and two-stage aeration tank is provided with the flocculation adsorption zone respectively; From the outlet at bottom of one-level settling tank and second-level settling pond to the one-level aeration tank and the flow process of two-stage aeration tank inlet be the segmentation and the multistage return-flow structure of active sludge.CN1410366 and CN2481707 are biological process, and efficiencies of nitrogen removal is good, but it is poor to remove phosphorus stabilizer, and be poorer to the phosphor-removing effect that contains high phosphorus sewage.Chinese patent CN1417142 disclosed " chemically reinforced biological phosphate-eliminating process " comprises that biological phosphate-eliminating removes dirt, mud-water separation, anaerobic phosphorus release and chemical dephosphorization processing step, its chemical dephosphorization is to add chemical precipitation agent in the chemical dephosphorization pond, makes the way dephosphorization of the phosphorus precipitation discharging in the treatment solution.Though effectively dephosphorization of this method, but the waste disposal plant of this method has increased by three operating units, promptly increased the denitrification pond and increased P releasing tank and chemical dephosphorization pond between aeration tank and settling tank behind settling tank, this has just increased floor space, increased investment, increased energy consumption, increased weak point such as sewage disposal expense.
Three, summary of the invention
The objective of the invention is weak point, a kind of urban sewage chemical-biologic composite deep phosphorous removal system and method is provided at dephosphorization technique in the existing municipal sewage treatment.System of the present invention has that operating unit is few, and compact construction can be saved floor space and operation energy consumption effectively, saves initial cost, and reduces characteristics such as sewage disposal expense.The inventive method has that technology is simple, speed of response is fast, the treatment time is short, phosphor-removing effect is remarkable especially, and the phosphorus index of handling in the water of back can reach national grade one discharge standard, and also has strong shock resistance, the mud of generation characteristics such as do not expand.
The object of the present invention is achieved like this: a kind of urban sewage chemical-biologic composite deep phosphorous removal system mainly comprises operating unit and chemicals dosing plant and sludge treatment unit etc. such as grid, settling pit, preliminary sedimentation tank, anoxic speed change biological filter and combined aeration and deposition tank, passes through pipe connection therebetween.The main operating unit of its settling pit and preliminary sedimentation tank and combined aeration and deposition tank is two sets in parallel operation, handles and is convenient in order to the huge town sewage of sewage quantity and overhaul in turn.Its combined aeration and deposition tank, mainly be made of aeration tank and second pond, main device has the triangle metering weir of making water inlet metering usefulness in the aeration tank, as the aeration impeller of aeration, and its bottom be provided with the mud thrust-augmenting nozzle so that with the throw out water conservancy diversion in the aeration tank to second pond.The aeration tank is connected by training wall with settling tank; In second pond, be provided with effluent trough, shore pipe, go out water channel, reach blow-down pipe; Chemicals dosing plant mainly by adding coyote hole, form, and adds coyote hole and be connected with the aeration tank of two groups of combined aeration and deposition tanks respectively with dosing valve by chemical feed pipe by chemical feed pipe and dosing valve.The chemical floc that adds in the coyote hole adds in the aeration tank by chemicals dosing plant.In the aeration tank, make the Fe in the flocculation agent
3+With the PO in the treating water
4 3-In conjunction with forming alumen ustum, quicken flocculation sediment, thereby effectively remove the phosphorus in the treating water; While accelerating solid material settling velocity, thus the residence time for the treatment of water can be reduced at second pond, and treating water can reduce to 1.5 hours by traditional 3 hours in the residence time of second pond.Combined aeration and deposition tank adopts the water of being back to back, the mode of gap operation.Combined aeration and deposition tank compact construction, anti-impact force be strong, take up an area of province, less investment, saving operation energy consumption, and speed of response is fast, the treatment time is short.Its sludge treatment unit mainly comprises between sludge thickener, storage basin, sludge press filtration etc.By pipe connection, its sludge thickener is two sets in parallel operation therebetween, and adapting to requirement and the easy access that huge sewage quantity is handled, the sludge treatment unit concentrates mud, transport outward after the dehydration, press filtration, can be used as fertilizer etc.
A kind of method steps of urban sewage chemical-biologic composite deep phosphorous removal method is as follows:
1, grid is held back big suspended substance
After treatment sewage enters inlet well from sewage water inlet pipe, at first hold back except that behind the suspended substance bigger in the decontaminated water by grid, treating water enters settling pit by connecting tube.
2, settling pit is removed the bigger inorganic particle of proportion
Treating water by grid enters settling pit, and after precipitation was removed the inorganic particle that proportion is bigger in the treating water, treating water was by connecting tube and preliminary sedimentation tank in settling pit.
3, preliminary sedimentation tank is removed part SS and the suspension BOD in the sewage
5
After the treating water of process settling pit entered preliminary sedimentation tank, the process precipitation was removed part SS and the suspended substance BOD in the treating water in preliminary sedimentation tank
5After, treating water enters anoxic speed change biological filter by pipe connecting; Throw out (being mud) enters the sludge treatment unit by pipe connecting.
4, partly COD, SS and ammonia are removed in anoxic speed change biological filter
Treating water through preliminary sedimentation tank enters anoxic speed change biological filter, and in anoxic speed change biological filter, by the effect of anoxic speed change enzyme, behind part COD, the SS and ammonia in the removal treating water, treating water enters combined aeration and deposition tank by connecting tube; Throw out is that mud enters the sludge treatment unit by pipe connecting.
5, phosphorus, denitrogenation, turbidity removal are removed in the combined aeration and deposition tank combination
Treating water through anoxic speed change biological filter enters the combined building aeration pond by control valve, in its aeration tank, by the biological action and the biological flocculation of active sludge, further removes COD, BOD in the treating water
5, SS and nitrogen.By chemicals dosing plant,, in the aeration tank, add 0.03 ‰～0.15 ‰ phosphate eliminating flocculant simultaneously according to the size of sewage quantity.Phosphate eliminating flocculant is a kind of ferruginous chemical floc, the Fe in the phosphate eliminating flocculant
3+With the PO in the treating water
4 3-In conjunction with, form alumen ustum, quicken flocculation sediment, thereby effectively remove the phosphorus in the water.Simultaneously and since flocculation agent can flocculation sediment suspended particulate and colloidal attitude material in the waste water, can further remove other form in the water phosphorus and more effective removal SS, strengthen and remove COD, BOD
5Deng.Water outlet by the aeration tank enters second pond through training wall, realizes solid-liquid separation in second pond, and the water after the processing can reach national grade one discharge standard, and treating water is emitted by rising pipe.Mud enters the sludge treatment unit by mud valve and pipe connecting.Because sewage is process chemistry and biological combined flocculation effect in the aeration tank, but the settling velocity of accelerating solid material, thus make treating water reduce to 1.5 hours from traditional 3 hours in the residence time of second pond.
6, the sludge treatment unit concentrate, dehydration, press filtration mud
Enter the unitary storage basin of sludge treatment from the mud of preliminary sedimentation tank and the discharge of anoxic speed change biological filter by pipe connecting, the mud of discharging from the second pond of combined aeration and deposition tank enters storage basin by pipe connecting after entering the unitary sludge thickener of sludge treatment and carry out concentration by connecting tube again.Through the mud of storage basin enter by pipe connecting that the mud filter is dewatered between pressing, after press filtration handles, outward transport can be used as fertilizer etc.
After the present invention adopts technique scheme, have following principal feature:
1, Fa Ming method utilizes chemical flocculation dephosphorization to combine with biological turbidity removal, can carry out the deep phosphorous removal of municipal effluent, have that technology is simple, speed of response is fast, the treatment time reduced to 1.5 hours from traditional 3 hours, phosphor-removing effect is remarkable especially, can reach national grade one discharge standard etc.The present invention can extensively use the huge municipal sewage treatment of sewage quantity, particularly applies to the high sewage disposal of phosphorus content.
2, Fa Ming method has been saved flocculation mixing pit and reaction tank in the flocculation dephosphorization traditional technology in flocculation dephosphorization process process, and promptly the aeration tank is forward and backward does not all need to build in addition flocculation mixing pit and reaction tank.Operating unit in the invention system is few, and compact construction takes up an area of province, less investment, can save operation energy consumption and initial cost etc.The method of invention combines chemical flocculation dephosphorization with biological turbidity removal, dephosphorization and denitrogenation turbidity removal etc. are finished in same aeration tank, uses it for the processing of high phosphorus-containing wastewater, be a kind of compactness, efficiently, economy, the strong sewage water treatment method of shock resistance.
3, Fa Ming method in flocculation dephosphorization process process, the pH value that do not need to regulate sewage, can directly handle.The method of invention both can be applicable in the sewage work of anoxic one aerobic method (A/O method) technology; Also can in other municipal sewage treatment novel process, be applicable; For example the do not connect sewage work of anoxic biological filter also can utilize.
4, the aeration tank in the invention system utilizes chemical-biological dephosphorization, denitrogenation, turbidity removal, and its speed of response is fast, and the treatment time is short, and phosphor-removing effect is remarkable especially, and the phosphorus index of handling in the water of back can reach national grade one discharge standard.
5, the settling pit in the invention system, preliminary sedimentation tank, the main operating unit of combined aeration and deposition tank are two sets in parallel operation, can the huge municipal effluent of the amount of disposing of sewage.
6, in the invention system, second pond can adopt combined aeration and deposition tank.It is big that combined aeration and deposition tank takes up an area of province, less investment, lifting capacity.
Four, description of drawings
Fig. 1 is the structural representation of system of the present invention and the schema of the inventive method;
Fig. 2 is the structural representation of the combined aeration and deposition tank of system of the present invention;
Fig. 3 is the vertical view of Fig. 2.
Among the figure: 1, sewage water inlet pipe; 2, inlet well; 3, grid; 4, settling pit; 5, preliminary sedimentation tank; 6, aeration tank; 7, second pond; 8, anoxic speed change biological filter; 9, add coyote hole; 10, treating water rising pipe; 11, shore pipe; 12, sewage concentration basin; 13, storage basin; 14, between sludge press filtration; 16, water inlet pipe; 17, control valve; 18, dosing valve; 19, aeration impeller; 20, training wall; 21, go out water channel; 22, mud valve; 23, blow-off valve; 24, mud thrust-augmenting nozzle; 25, triangle metering weir; 26, filter pore; 27, water leg.
Five, embodiment
Below in conjunction with embodiment, further specify the present invention.
Shown in Fig. 1～3, a kind of urban sewage chemical life assemblage dephosphorization system, mainly comprise operating unit and chemicals dosing plant and sludge treatment unit etc. such as grid 3, settling pit 4, preliminary sedimentation tank 5, anoxic speed change biological filter 8 and combined aeration and deposition tank, pass through pipe connection therebetween.Its settling pit 4, preliminary sedimentation tank 5, and the main operating unit of combined aeration and deposition tank be two sets in parallel operation.Its combined aeration and deposition tank mainly is made of aeration tank 6 and second pond 7, major equipment has as the triangle of Sewage metering metering weir 25, as the aeration impeller 19 of aeration and the mud thrust-augmenting nozzle 24 of bottom in aeration tank 6, so as with the throw out water conservancy diversion in the aeration tank 6 in second pond 7; Aeration tank 6 is connected by training wall 20 with second pond 7, in second pond 7 major equipment filter pore 26, water leg 27 arranged, go out water channel 21 and treating water rising pipe 10, shore pipe etc.Chemicals dosing plant mainly comprises and adds coyote hole 9, chemical feed pipe and dosing valve 18, add coyote hole 9 and be connected with the aeration tank 6 of two groups of combined aeration and deposition tanks respectively with dosing valve 18 by chemical feed pipe, the chemical floc that adds in the coyote hole 9 adds in the aeration tank of combined aeration and deposition tank by chemical feed pipe and dosing valve 18.Decontamination mud processing unit mainly comprises between sludge thickener 12, storage basin 13, sludge press filtration 14, and by pipe connection, its sludge thickener 12 is two sets in parallel operation, to adapt to huge sewage quantity processing requirements and easy access therebetween.
A kind of urban sewage chemical-biologic composite deep phosphorous removal method, as certain sewage work, the phosphorus content of sewage water inlet is 6.3mg/L, and is as follows with method steps of the present invention:
1, grid is held back big suspended substance
Treatment sewage is at first held back except that behind the suspended substance bigger in the decontaminated water by grid 3 after entering inlet well 2 from sewage water inlet pipe 1, and treating water enters settling pit 4 by connecting tube.
2, settling pit is removed inorganic particle
Enter settling pit 4 by the treating water behind the grid 3, after precipitation was removed the inorganic particle that proportion is bigger in the treating water, treating water entered preliminary sedimentation tank 5 by connecting tube in settling pit 4.
3, preliminary sedimentation tank is removed part SS and the suspension BOD in the sewage
5
After treating water behind the process settling pit 4 entered preliminary sedimentation tank 5, the process precipitation was removed part SS and the suspended substance BOD in the treating water in preliminary sedimentation tank
5After, treating water enters anoxic speed change biological filter 8 by pipe connecting, and throw out (being mud) enters the sludge treatment unit by pipe connecting.
4, partly COD, SS and ammonia are removed in the speed change biological filter
Enter anoxic speed change biological filter 8 through the treating water behind the preliminary sedimentation tank 5, in anoxic speed change biological filter 8, by the effect of anoxic speed change enzyme, behind part COD, the SS and ammonia in the removal treating water, treating water enters combined aeration and deposition tank by connecting tube; Throw out (being mud) enters the sludge treatment unit by pipe connecting.
5, combined aeration and deposition tank combination dephosphorization, denitrogenation, turbidity removal
Enter the aeration tank 6 of combined aeration and deposition tank through the treating water of anoxic speed change biological filter 8 through control valve 17, in aeration tank 6,, further remove COD, BOD in the treating water by the biological action and the biological flocculation of active sludge
5, SS and nitrogen.Pass through chemicals dosing plant simultaneously, the phosphorus in aeration tank 6 in the adding 0.1 ‰ chemical dephosphorization flocculation agents removal treating water etc.; Water outlet by aeration tank 6 enters second pond 7 through training wall 20, in second pond 7, realizes solid-liquid separation, and the water phosphorus content after the processing is 0.48mg/L, reaches national grade one discharge standard, emits by treating water rising pipe 10.Handle as not adding the chemical dephosphorization flocculation agent, the waste water of discharging is phosphorous to be 5.9mg/L, confirms the particular significant effect of chemical-biological combination dephosphorization of the present invention.Mud enters the sludge treatment unit by mud valve 22 and shore pipe 11.
6, the sludge treatment unit concentrate, dehydration, press filtration mud
Enter the unitary storage basin 13 of sludge treatment from the mud of preliminary sedimentation tank 5 and 8 discharges of anoxic speed change biological filter by shore pipe 11, the mud of discharging from the second pond 7 of combined aeration and deposition tank enters storage basin 13 by pipe connecting after entering the unitary sludge thickener 12 of sludge treatment and carry out concentration by shore pipe 11 again.Enter mud filter by pipe connecting and 14 carry out sludge dewatering between pressing, after press filtration is handled, outward transport.
Claims (4)
1, a kind of urban sewage chemical life assemblage dephosphorization system, mainly comprise grid (3), settling pit (4), preliminary sedimentation tank (5), anoxic speed change biological filter (8) operating unit and sludge treatment unit, pass through pipe connection therebetween, it is characterized in that also having mainly by the combined aeration and deposition tank operating unit of aeration tank (6) and second pond (7) formation and mainly comprise and add coyote hole (9), the chemicals dosing plant of chemical feed pipe and dosing valve (18), aeration tank (6) is connected by training wall (20) with second pond (7), aeration tank (6) is connected with anoxic speed change biological filter (8) by pipeline, the isolated water of second pond (7) is discharged by treating water rising pipe (10), isolated throw out is connected with sludge thickener (12) by shore pipe (11), adds coyote hole (9) and is connected with the aeration tank (6) of two groups of combined aeration and deposition tanks respectively with dosing valve (18) by chemical feed pipe.
2,, it is characterized in that settling pit (4), preliminary sedimentation tank (5) and the main operating unit of combined aeration and deposition tank are two sets in parallel operation according to the described urban sewage chemical life assemblage of claim 1 dephosphorization system.
3, a kind of urban sewage chemical-biologic composite deep phosphorous removal method is characterized in that method steps is as follows:
(1) grid is held back big suspended substance
Treatment sewage is at first held back except that behind the suspended substance bigger in the decontaminated water by grid (3) after entering inlet well (2) from sewage water inlet pipe (1), and treating water enters settling pit (4) by connecting tube;
(2) settling pit is removed inorganic particle
Enter settling pit (4) by the treating water behind the grid (3), after precipitation was removed the inorganic particle that proportion is bigger in the treating water, treating water entered preliminary sedimentation tank (5) by connecting tube in settling pit (4);
(3) preliminary sedimentation tank is removed part SS and the suspension BOD in the sewage
5
After treating water behind the process settling pit (4) entered preliminary sedimentation tank (5), the process precipitation was removed part SS and the suspended substance BOD in the treating water in preliminary sedimentation tank
5After, treating water enters anoxic speed change biological filter (8) by pipe connecting, and throw out enters the sludge treatment unit by pipe connecting;
(4) partly COD, SS and ammonia are removed in the speed change biological filter
Enter anoxic speed change biological filter (8) through the treating water behind the preliminary sedimentation tank (5), in anoxic speed change biological filter (8), by the effect of anoxic speed change enzyme, after removing part COD, the SS and ammonia in the treating water, treating water enters combined aeration and deposition tank by connecting tube, and throw out enters the sludge treatment unit by pipe connecting;
(5) combined aeration and deposition tank combination dephosphorization, denitrogenation, turbidity removal
Enter the aeration tank (6) of combined aeration and deposition tank through the treating water of anoxic speed change biological filter (8) through control valve (17), in aeration tank (6),, further remove COD, BOD in the treating water by the biological action and the biological flocculation of active sludge
5, SS and nitrogen, pass through chemicals dosing plant simultaneously, in aeration tank (6), add the phosphorus in 0.03 ‰～0.15 ‰ phosphate eliminating flocculant removal treating water, water outlet by aeration tank (6) enters second pond (7) through training wall (20), in second pond (7), realize solid-liquid separation, the water after the processing is emitted by treating water rising pipe (10), and isolated throw out enters the sludge treatment unit by mud valve (22) and shore pipe (11);
(6) the sludge treatment unit concentrate, dehydration, press filtration mud
Enter the unitary storage basin of sludge treatment (13) from the mud of preliminary sedimentation tank (5) and anoxic speed change biological filter (8) discharge by shore pipe (11), after the mud of discharging from the second pond (7) of combined aeration and deposition tank enters the unitary sludge thickener of sludge treatment (12) and carries out concentration by shore pipe (11), enter storage basin (13) by pipe connecting again, enter between mud filter pressure (14) by pipe connecting.
4,, it is characterized in that dephosphorization and the denitrogenation turbidity removal in (5) step carried out in same aeration tank (6) according to the described urban sewage chemical-biologic composite deep phosphorous removal method of claim 3.
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| CNB200510020129XA CN1283562C (en) | 2005-01-06 | 2005-01-06 | System and method for urban sewage chemical-biologic composite deep phosphorous removal |
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| CNB200510020129XA CN1283562C (en) | 2005-01-06 | 2005-01-06 | System and method for urban sewage chemical-biologic composite deep phosphorous removal |
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| CN1283562C true CN1283562C (en) | 2006-11-08 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104355477B (en) * | 2014-09-11 | 2016-08-17 | 北京城市排水集团有限责任公司 | Sewage treatment plant's chemical dephosphorization automaton and control method |
| CN104591497A (en) * | 2015-01-15 | 2015-05-06 | 大连交通大学 | Device and method for strengthening phosphorous removal and purification of sewage in chemical and biochemical reaction processes |
| CN105347572A (en) * | 2015-12-02 | 2016-02-24 | 仲小勇 | Automobile wastewater circulating treatment system and automobile wastewater circulating treatment method |
| CN107226579A (en) * | 2016-03-24 | 2017-10-03 | 福建省三净环保科技有限公司 | A kind of sewage disposal device |
| CN108002657A (en) * | 2017-12-24 | 2018-05-08 | 苏州克莱尔环保科技有限公司 | A kind of sewage treatment process |
| CN108773980B (en) * | 2018-06-29 | 2021-07-20 | 河南能源化工集团鹤壁煤化工有限公司 | BDO wastewater treatment process |
| CN113754192A (en) * | 2021-09-14 | 2021-12-07 | 叶婷婷 | High-salinity wastewater refining process and equipment |
| CN116425291A (en) * | 2023-06-08 | 2023-07-14 | 四川发展环境科学技术研究院有限公司 | Intensive tap water treatment process |
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