Multi-point water feeding town sewage treatment system and treatment method thereof

A technology of urban sewage and multi-point water inflow, applied in the sewage treatment system and its treatment field, can solve the problems such as the contradiction between nitrifying bacteria and phosphorus accumulating bacteria, and achieve the effect of improving the effect

Inactive Publication Date: 2013-08-21
李思敏
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Problems solved by technology

[0005] The invention provides a multi-point inflow urban sewage treatment system and its treatment method, which solves the mud age contradiction between nitrifying bacteria and phosphorus accumulating bacteria in the traditional A2 / O process and the carbon generation between microorganisms of different populations. Source competition problem, improve the nitrogen and phosphorus removal effect of the process operation

Method used

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  • Multi-point water feeding town sewage treatment system and treatment method thereof

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Embodiment 1

[0039] The volume ratio of the test device anaerobic tank, anoxic tank and aerobic tank is 1:1:3, and the total residence time of sewage is 13 hours. The test water was taken from the urban mixed sewage behind the fine screen of a sewage treatment plant. After the sewage passes through the primary sink of the raw water tank, the influent water quality is: pH is about 7.3, temperature is 20°C, COD=180-350mg / L, BOD 5 =85~210mg / L, NH 3-N=21~42mg / L, TN=29~58mg / L, TP=2.1~7.8mg / L, C / N ratio is 5~6, which belongs to typical low C / N ratio sewage. The raw water deposited in the raw water tank enters the anaerobic pool and the anoxic pool at a ratio of 5:5, and the effluent from the anaerobic pool and the anoxic pool directly enters the aerobic pool. The reflux ratio of the nitrifying liquid is 200%, and the sludge reflux ratio is 75%. . The sewage entering the anaerobic tank undergoes a biochemical reaction under the action of anaerobic bacteria. The anaerobic reaction breaks the ma...

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Abstract

The invention provides a multi-point water feeding town sewage treatment system and a treatment method thereof so as to overcome the problems of sludge age contradiction between nitrobacteria and phosphorus-accumulating bacteria and competition for a carbon source among different populations of microbes in a traditional A2/O process and to improve nitrogen and phosphorus removal effects of process operation. The multi-point water feeding town sewage treatment system provided by the invention comprises a raw water tank. The raw water tank is respectively connected with an anaerobic tank and an anoxic tank through peristaltic pumps; a water outlet of the anaerobic tank and a water outlet of the anoxic tank are connected with an aerobic tank, and a water outlet of the aerobic tank is connected with a sedimentation basin; a nitrification liquid outlet of the aerobic tank is connected with a nitrification liquid return pipe and the anoxic tank through peristaltic pumps; the lower part of the sedimentation basin is respectively connected with a sludge discharge pipe and a sludge return pipe through valves, and the sludge return pipe is connected with the anaerobic tank through one peristaltic pump; the lower part of the aerobic tank is connected with an air compressor through an aerator pipe; and the interiors of the anaerobic tank and the anoxic tank are respectively provided with a stirrer.

Description

technical field [0001] The invention relates to a sewage treatment system and a treatment method thereof, in particular to a multi-point water inflow urban sewage treatment system and a treatment method thereof. Background technique [0002] As the problem of "eutrophication" of water bodies becomes more and more prominent, and the sewage discharge standards become more and more stringent, the urban sewage treatment technology has entered the stage of advanced treatment that not only removes organic matter, but also removes nitrogen and phosphorus. stage. In addition, the C / N ratio of most urban sewage in my country is low, the contradiction between nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria in terms of sludge age during operation, and many other factors have resulted in the effluent of many urban sewage treatment plants failing to meet the "urban sewage Treatment Plant Pollutant Discharge Standards" (GB18918-2002) stipulates the first-cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 李思敏杜国帅唐锋兵
Owner 李思敏
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