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Urban sewage oxidation treatment technology

A technology for oxidation treatment and urban sewage, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as low efficiency and poor denitrification effect, and achieve improved efficiency and Quality, improve the effect of external reflux ratio

Inactive Publication Date: 2016-08-24
宋正兴
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  • Summary
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AI Technical Summary

Problems solved by technology

Existing A 2 / C oxidation ditch has poor phosphorus and denitrification effect and low efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] An urban sewage oxidation treatment process is characterized in that it comprises the following steps:

[0012] Water intake, coarse grid filtration, fine grid filtration, sedimentation in grit chamber, sedimentation in primary sedimentation tank, A 2 / C Oxidation ditch oxidation treatment, secondary precipitation treatment, disinfection treatment, effluent;

[0013] In the oxidation treatment of the A2 / C oxidation ditch, the oxidation ditch includes anaerobic zone, anoxic zone and oxidation ditch zone; the residence time of phosphorus absorption in the anoxic zone is 30 to 55 minutes; the residence time of the mixed solution in the anaerobic zone is 1 to 1.8 h; Under the anaerobic zone, there is an underwater agitator; in the oxidation ditch zone, there is a surface aerator.

Embodiment 2

[0015] On the basis of Example 1, as a preferred solution, the volume of the A2 / C oxidation ditch is 50,000 to 80,000 cubic meters, the external reflux ratio is 100%, and the maximum mixed liquor reflux ratio is 500%. The residence time is 14~17h; the water depth is 6m. When in use, the flow rate is designed with the maximum flow rate, and 6 Roots blowers are used.

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PUM

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Abstract

The invention discloses an urban sewage oxidation treatment technology which comprises the following steps of: incoming water, coarse-screen filtration, fine-screen filtration, sedimentation in a grit chamber, sedimentation in a primary sedimentation tank, oxidation treatment in an A2 / C oxidation ditch, secondary sedimentation treatment, disinfection treatment and effluent, wherein the oxidation ditch in the oxidation treatment in an A2 / C oxidation ditch comprises an anaerobic zone, anoxic zone and an oxidation ditch zone; the phosphorus absorption staying time in the anoxic zone is 30-55min; the mixed liquid staying time in the anaerobic zone is 1-1.8h; an underwater stirrer is arranged in the anaerobic zone; and a surface aerator is arranged in the oxidation ditch. By adopting the oxidation treatment technology disclosed by the invention, the outer reflux ratio and the maximum mixed-liquid reflux ratio can be increased so as to improve the phosphorous removal and nitrate return efficiency and quality.

Description

technical field [0001] The invention relates to an urban sewage oxidation treatment process. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, the requirements for the ecological environment are increasing, and more and more sewage is required to be discharged after treatment. In the whole country and even in the world, there are more and more sewage plants under construction and to be built. In recent years, the number of large-scale sewage treatment plants has been relatively reduced, while the number of small and medium-sized sewage plants has increased. How to do a good job in the sewage grit treatment process is a problem that many experts and engineers and technicians have paid more attention to in recent years. A2 / C oxidation ditch is often used in the process of urban sewage treatment. Oxidation ditch, also known as oxidation ditch, is named because its structure is a closed annular ditch. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 宋正兴
Owner 宋正兴
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