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Physiochemical and biochemical interactive city sewage treating method

A technology for biochemical treatment and urban sewage, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. And the problem of unstable phosphorus removal effect

Inactive Publication Date: 2005-03-02
TONGJI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] With the increasing eutrophication of water bodies, the nitrogen and phosphorus discharge standards of urban sewage treatment plants are getting higher and higher. At present, the most widely used nitrogen and phosphorus removal process is A / A / O and its improved process. This process is mainly composed of Composed of anaerobic tank, anoxic tank, aerobic tank and secondary sedimentation tank, the removal effect of organic pollutants and suspended solids is good, but there are some disadvantages: ①The removal effect of nitrogen and phosphorus is unstable; ②Influent water quality and quantity The change of the hydraulic pressure has a great influence on the operation effect; ③The design hydraulic retention time is longer, and the operating cost is higher
[0009] SBR and its variant process realize anaerobic, anoxic and aerobic in time series to achieve the function of denitrification and phosphorus removal. The reaction and sedimentation process are concentrated in one pool, which has the advantages of less processing structures, small footprint and flexible operation. and other characteristics, but it also has some disadvantages: ①SBR and its variants both use decanters. Due to the limitation of the water output of the decanters, it is impossible to treat a large amount of water in a single tank, so this process is not suitable for large-scale sewage treatment plants; ②The volume utilization rate of the reactor is low, and the water head loss is large; ③The utilization rate of the system equipment is low, and the control is complicated; ④Affected by the reaction time, the reaction conditions of anaerobic, anoxic and aerobic cannot be fully guaranteed; ⑤The effluent is not continuous, and subsequent treatment difficulty
[0011] The UNITANK process is actually very similar to the three-ditch oxidation ditch process. Although the secondary settling tank and the sludge return system can be omitted, they have ① no obvious independent anaerobic and anoxic areas, which affect the nitrogen and phosphorus removal effect; ② The sludge concentration in the reaction tank is unbalanced. In the later stage of the reaction cycle, the sludge concentration on the inlet side is low, and the sludge concentration on the sedimentation side is high. ③The number of UNITANK process equipment is large, the utilization rate of the equipment is low, and the control is complicated; ④The outlet weir is fixed, and the initial outlet The amount of water is difficult to determine and requires backflow treatment

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  • Physiochemical and biochemical interactive city sewage treating method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]When the water quality and water quantity are normal, the series operation mode is selected. The specific steps are: introduce the urban sewage treated by sand settling in a certain place into the interactive reactor, the influent water enters the anaerobic pool 2, and the mixed solution in the aerobic pool is pushed through the wall. The flow pump returns to the anoxic tank 3; the return sludge enters the pre-anoxic tank 1, and the sewage flows through the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4, and the post-aeration tank 5 in turn, and flows out of the flocculation tank 6 for reaction device, through the sedimentation tank 7 water outlet. The average temperature of influent water is 22°C, and the average pH value is 7.37. The hydraulic retention time of sewage in the reactor is 9h, the average sludge reflux ratio is 100%, the average mixed liquid reflux ratio is 200%, the sludge concentration is maintained at 3.5g / L, and the average sludge age is 10d. ...

Embodiment 2

[0030] For combined sewage pipelines during heavy rains, or when the water volume increases during heavy rains due to pipe network leakage and other reasons in separate pipelines, the mode of parallel connection of physicochemical and biochemical processes is run. At this time, except that the sewage is treated through the unit anaerobic pool 2, anoxic pool 3, and aerobic pool 4 (running in an aerobic mode), the water is discharged to the secondary sedimentation tank (to keep the organic load of the biological treatment system unchanged), and the overloaded part of the sewage The flow is diverted to the rear aeration tank 5 and the flocculation tank 6, and after physical and chemical strengthening treatment, it is merged into the secondary sedimentation tank.

[0031] The urban sewage treated by sand settling in a certain place is introduced into the interactive reactor. The average water temperature of the incoming water is 26.5°C, and the average pH value is 7.44. The hydrau...

Embodiment 3

[0034] When the influent COD and TN concentrations are not high or the water volume is not large, the sewage treatment runs in parallel mode. At this time, 70% of the influent water enters the rear aeration tank 5 and the flocculation tank 6 to make full use of the chemical biological flocculation, and achieve the purpose of removing organic matter and phosphorus within a reaction time of less than 1 hour, and 30% of the sewage enters the pre-aeration tank in turn. Anoxic pool 1, anaerobic pool 2, anoxic pool 3, and aerobic pool 4 are used for organic matter degradation and denitrification. At this time, pre-anoxic pool 1, anaerobic pool 2, anoxic pool 3, and aerobic pool 4 also Partial operation is possible, and some units are on standby.

[0035] The urban sewage treated by sand settling in a certain place is pumped into the interactive reactor, the average temperature of the influent water is 25°C, and the average pH value is 7.32. The hydraulic retention time of sewage in...

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Abstract

The present invention belongs to the field of environment protecting technology, and is especially interactive physiochemical and biochemical city sewage treating method. The treating reactor is provided with pre-hypoxia, anaerobic, hypoxia, aerobic and other biochemical treating units and physiochemical treating unit with flocculent thrown. The physiochemical treating unit under different treating mode may be used as biochemical treating unit, and the reaction condition of the reaction units may be altered based on the different quality of inflow water and the different treating requirement. The present invention realizes the serial or parallel connecting of the biochemical treating unit and physiochemical treating unit to make the system always in minimum running cost while eliminating pollutant effectively to ensure drainage quality.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a physical-chemical-biochemical interactive urban sewage treatment method. Background technique [0002] Generally speaking, sewage treatment technology can be divided into physical treatment technology, physical chemical treatment technology, biochemical treatment technology and chemical treatment technology, among which biochemical treatment technology of sewage is the most commonly used. There are also many kinds of biochemical treatment technologies, which are mainly classified according to the different conditions of microbial growth conditions and oxygen supply methods. In order to achieve the purpose of nitrogen and phosphorus removal in biological treatment, it is necessary to create anaerobic, anoxic, and aerobic regions in the space or time of the reactor, so as to realize different forms of anaerobic-aerobic phosphorus removal and aerobic-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F3/30C02F9/14
Inventor 周琪郑兴灿曾庆福杨殿海顾国维颜秀勤邱兆富张秀华钱鸣
Owner TONGJI UNIV