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Treatment process for domestic sewage

A technology for treating process and domestic sewage, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Liquid separation and other problems, to achieve the effect of improving the removal rate of SS, reducing the production of sludge, and reducing the cost of sludge treatment

Active Publication Date: 2015-04-22
湖北迈威环境工程有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main manifestations of sludge bulking are loose sludge structure, poor sedimentation compression performance, increased SV value, and difficulty in solid-liquid separation in secondary sedimentation tanks, resulting in a large amount of sludge loss, turbid effluent, low concentration of return sludge, and sometimes accompanied by a large amount of sludge. The generation of foam directly affects the normal operation of the entire biochemical system
Surveys show that more than 90% of sludge bulking is caused by the proliferation of filamentous bacteria. Filamentous bacteria sludge bulking not only affects the quality of effluent water, but also produces a large number of foams, which seriously endanger the operation of sewage treatment plants.

Method used

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  • Treatment process for domestic sewage
  • Treatment process for domestic sewage
  • Treatment process for domestic sewage

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Experimental program
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Embodiment 1

[0020] After the sewage is pretreated, it is treated in turn in the primary sedimentation tank, biological tank and secondary sedimentation tank. The biological tank includes anoxic section, anaerobic section, second anoxic section, second anaerobic section, third anoxic section Oxygen section, aerobic section;

[0021] The sewage and the return sludge from the secondary sedimentation tank are mixed and then enter the anoxic section (DO 0.2-0.5mg / L) for treatment, and the sewage residence time is 0.3h;

[0022] The effluent from the anoxic section enters the anaerobic section (DO≤0.2mg / L) for treatment, and the sewage residence time is 0.2h;

[0023] The effluent from the anaerobic section is mixed with the return sewage from the aerobic section and enters the second anoxic section (DO 0.2-0.5mg / L) for treatment. The sewage return rate is 20-50%, and the sewage residence time is 0.4h;

[0024] The effluent from the anoxic section enters the second anaerobic section (DO≤0.2mg / ...

experiment example

[0028] Taking an urban sewage treatment plant as an example, A / O treatment process is adopted. Table 1 shows the actual operation data of the plant for four consecutive months from October 2013 to January 2014. "(GB18918-2002) secondary standard. The plant began to adopt the treatment process of the present invention from March to June, 2014, and detected that the effluent of these four months fully reached the first-class A standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002). For details, see Table 2.

[0029] Table 1

[0030]

[0031] Table 2

[0032]

[0033]

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PUM

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Abstract

The invention discloses a treatment process for domestic sewage. After being pretreated, the sewage is sequentially treated by a primary sedimentation tank, a biological tank and a secondary sedimentation tank, wherein the biological tank comprises an anoxic zone, an anaerobic zone, a second anoxic zone, a second anaerobic zone, a third anoxic zone and an aerobic zone. As low DO, the anaerobic zones and the anoxic zones are arranged alternately, competitive equilibrium of filamentous bacteria and zoogloea is facilitated, the sewage treatment effect is improved, expansion of filamentous bacterium sludge can be prevented, and the cost of sewage treatment is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a domestic sewage treatment process. Background technique [0002] The activated sludge process is the most widely used sewage treatment process in the world today. With the continuous improvement of the process in production practice, especially in recent decades, based on extensive research on its biological reaction and purification mechanism In terms of technology, the activated sludge method has been greatly improved, and an improved activated sludge method A / O method has been formed. In addition to degrading organic pollutants, the A / O method also has the function of denitrification and phosphorus removal. The DO in the A section is not more than 0.2mg / L, and the DO in the O section is 2-4mg / L. In the anoxic section, the heterotrophic bacteria hydrolyze the suspended solids such as starch, fiber, carbohydrates and soluble organic matter in the sewage in...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 韩彪宋红军曾广庆莫显坤赵伟潘正现张维维李骋莫春燕莫海燕
Owner 湖北迈威环境工程有限公司
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