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Treatment process of wastewater with high COD (Chemical Oxygen Demand) and low CN ratio

A wastewater treatment and process technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as secondary pollution, effluent discharge that cannot meet standards, and difficult control, etc., to achieve Improve the C/N ratio, facilitate biochemical treatment, and reduce operating costs

Inactive Publication Date: 2018-01-19
XINJIANG LVFENG ENVIRONMENT PROTECTION ENG CO LTD
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Problems solved by technology

[0002] At present, alkali-adding blow-off method, multi-stage sludge method, chemical precipitation method and breakpoint chlorination method are often used in wastewater treatment technology, but there are certain defects in the process of use, mainly in the suitable ammonia nitrogen content of alkali-adding blow-off method Wastewater greater than 500ppm is not easy to operate and easily causes secondary pollution. The multi-stage sludge method has high infrastructure costs and requires an additional carbon source (methanol), and the effluent cannot be discharged up to the standard. The chemical precipitation method is suitable for wastewater with an ammonia nitrogen content of less than 500ppm to generate phosphoric acid. Precipitation of ammonium and magnesium is not easy to control. Breakpoint chlorine addition method is suitable for wastewater with ammonia nitrogen content less than 50ppm. The operation cost is high, it is easy to cause secondary pollution, and it is not easy to operate.

Method used

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Embodiment 1

[0016] A wastewater treatment process with high COD and low CN ratio, the wastewater treatment process includes the following steps: Step 1: solid-liquid separation, industrial wastewater or aquaculture wastewater is passed through a solid-liquid separator to remove large particles of impurities in the wastewater ; Step 2: fermentation, the waste water obtained in step 1 after the removal of large particles of impurities is put into a fermenter for anaerobic treatment, most of the organic matter is removed, and organic nitrogen is converted into inorganic nitrogen; Step 3: biological fermentation, the The wastewater after anaerobic fermentation in step 2 is put into the biological denitrification tank for treatment to increase the C / N ratio in the wastewater; step 4: precipitation, the wastewater after biological fermentation is precipitated to separate the solid from the liquid; step 5: Biochemical treatment, the wastewater after precipitation in step 4 is sent to the A-A-0 bi...

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Abstract

The invention relates to a treatment process of wastewater with high COD (Chemical Oxygen Demand) and a low CN ratio. The wastewater treatment process comprises solid-liquid separation, fermentation,biological fermentation, precipitation, biochemical treatment and coagulation. The wastewater treatment process has the advantages of simple process, low operating cost and easiness in operation.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a wastewater treatment process with high COD and low CN ratio. Background technique [0002] At present, alkali-adding blow-off method, multi-stage sludge method, chemical precipitation method and breakpoint chlorination method are often used in wastewater treatment technology, but there are certain defects in the process of use, mainly in the suitable ammonia nitrogen content of alkali-adding blow-off method Wastewater greater than 500ppm is not easy to operate and easily causes secondary pollution. The multi-stage sludge method has high infrastructure costs and requires an additional carbon source (methanol), and the effluent cannot be discharged up to the standard. The chemical precipitation method is suitable for wastewater with an ammonia nitrogen content of less than 500ppm to generate phosphoric acid. The precipitation of ammonium and magnesium is ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 陈广胜梁家俊薛水波田政操李金花高洪标王军利黄永雷温彦鹏马诗院代开磊姚军
Owner XINJIANG LVFENG ENVIRONMENT PROTECTION ENG CO LTD