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Method for utilizing pre-depositing magnetic separation combined technology to treat municipal wastewater

A technology for technical treatment and municipal sewage, applied in the field of municipal sewage treatment with pre-sedimentation combined with magnetic separation technology, can solve the problems of poor effluent quality, shortage of land, difficult land acquisition, etc., and achieve large hydraulic load, stable effluent quality, and separation speed. quick effect

Inactive Publication Date: 2013-03-06
SCIMEE TECH & SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The secondary settling tank is an important part of the activated sludge system of the municipal sewage treatment plant. Its main function is to separate the sludge, clarify the water and concentrate the sludge. Significant, but there are disadvantages such as large land occupation and poor water quality
With the expansion of cities, every inch of land is expensive, whether it is a new municipal sewage treatment plant or a sewage treatment plant expansion, it may face the problem of land shortage or land acquisition difficulties

Method used

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  • Method for utilizing pre-depositing magnetic separation combined technology to treat municipal wastewater
  • Method for utilizing pre-depositing magnetic separation combined technology to treat municipal wastewater
  • Method for utilizing pre-depositing magnetic separation combined technology to treat municipal wastewater

Examples

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Embodiment 1

[0044] A municipal wastewater treatment project with a treatment scale of 25,000m 3 / d, the biochemical treatment is the oxidation ditch process, the sludge concentration of the oxidation ditch process is 3753 mg / L, the total phosphorus is 1.64 mg / L, and it flows into the pre-sedimentation system by gravity, and the surface hydraulic load of the pre-settling system is 2.4 m 3 / m 2 .h, the hydraulic retention time is 25min, the effluent sludge concentration of the pre-sedimentation system is 376mg / L, and the effluent sludge removal rate is 89.9%. The effluent from the pre-sedimentation system enters the magnetic separation system. Magnetic powder and micro-magnetic flocculation agents are added to the magnetic separation system successively to form flocs. After being separated by the magnetic separation wastewater purification system, the suspended solids in the effluent are 7 mg / L and the total phosphorus is 0.31 mg / L, the total phosphorus removal rate is 81.1%, and the efflu...

Embodiment 2

[0047] A municipal wastewater treatment project with a treatment scale of 48,000m 3 / d, the biochemical treatment is AAo (anaerobic-anoxic-aerobic method) process, the sludge concentration in the effluent of the biochemical treatment system is 2813mg / L, and the total phosphorus is 1.09mg / L. The waste water enters the pre-sedimentation system after biochemical treatment. The pre-sedimentation time of the pre-sedimentation system is 20 minutes, and the surface hydraulic load is 2.7m 3 / m 2 .h, the pre-settled effluent sludge concentration was 256 mg / L, and the effluent sludge removal rate was 90.9%. Then enter the magnetic separation system, add magnetic powder and micro-magnetic flocculation agent successively to form flocs, after being separated by the magnetic separation wastewater purification system, the effluent suspended matter is 8 mg / L, the total phosphorus is 0.27 mg / L, and the total The phosphorus removal rate is 75.2%, and the effluent is discharged after disinfect...

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Abstract

The invention relates to the field of wastewater treatment and especially relates to a method for utilizing a pre-depositing magnetic separation combined technology to treat municipal wastewater. The method comprises the following steps: pouring the wastewater into a pre-depositing system, primarily separating the wastewater from activated sludge and depositing 80-90% of activated sludge in the pre-depositing system; causing effluent to enter into a magnetic separation system; causing small sludge clusters in the wastewater to form micro-magnetic flocculation by adding micro-magnetic flocculation agent; utilizing a magnetic separation device to perform muddy water separation; and after disinfecting the effluent of the magnetic separation device, recycling or draining the effluent. The pre-depositing system is a manmade depositing system and comprises a water distributing unit, a depositing area, a sludge backflow area and a water draining unit. The method has the advantages of high separating speed, small floor space, strong resistance to an impact load, and the like.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for treating municipal sewage by adopting pre-sedimentation combined with magnetic separation technology. Background technique [0002] In recent years, the shortage of water resources has become a prominent problem that plagues my country's economic and social development. Especially in cities with a large population, on the one hand, water resources are highly stressed, and on the other hand, a large amount of sewage is produced in production and life, which poses a serious threat to the ecological environment. Reuse of waste water for production systems or daily miscellaneous purposes after standard treatment and reuse treatment is called sewage reuse. Sewage reuse can effectively save and utilize limited and precious fresh water resources, reduce the discharge of sewage or wastewater, reduce the pollution of the water environment, and slow down the overload of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F1/52
Inventor 肖波张科
Owner SCIMEE TECH & SCI CO LTD
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