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Post coagulation treating process for coking wastewater

A technology of coking sewage and treatment process, which is applied in the direction of flocculation/sedimentation water/sewage treatment, sedimentation treatment, dehydration/drying/concentrated sludge treatment, etc., which can solve the problem of low COD chemical oxygen demand in biochemical effluent and unsatisfactory effluent indicators Problems such as effluent standards and high biochemical external drainage indicators can be achieved to improve the coagulation effect, reduce biochemical external drainage, and improve the COD index.

Inactive Publication Date: 2017-02-22
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The coal coking sewage treatment system is mainly divided into three parts: pretreatment, biochemical treatment and physical and chemical treatment. The external drainage indicators are all high, and the biochemical effluent COD (chemical oxygen demand) indicator is low. With the increasingly stringent relevant environmental protection regulations, the effluent indicators can no longer meet the effluent standards stipulated by the current relevant environmental protection regulations.

Method used

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Embodiment Construction

[0011] Below through the description of the embodiment, the specific embodiment of the present invention is described in further detail, the purpose is to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present invention, and contribute to its implementation.

[0012] The invention provides a post-coagulation treatment process for coking sewage. Firstly, the sewage flows into the chemical coagulation tank to mix the sewage with the coagulant in the chemical coagulation tank, then the sewage enters the sedimentation tank, and then the coagulant in the sedimentation tank The sludge is pumped to the primary sludge concentration tank for concentration, and finally the sludge concentrated in the primary sludge concentration tank is pumped to the secondary sludge concentration tank for secondary concentration.

[0013] Specifically, in the first step of the treatment process of the presen...

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Abstract

The invention discloses a post coagulation treating process for coking wastewater. The treating process comprises the following steps: first, causing wastewater to flow into a chemical coagulation basin so that the wastewater is mixed with a coagulant in the chemical coagulation basin, then causing the wastewater to enter a settling basin, then pumping the sludge in the settling basin into a primary sludge thickener to carry out thickening, and finally pumping the sludge thickened in the primary sludge thickener into a secondary sludge thickener to carry out secondary thickening. According to the post coagulation treating process for coking wastewater, the chemical coagulation basin is especially arranged additionally for mixing the coagulant with the wastewater, so that the coagulation effect is improved, and through directly pumping the sludge at the bottom of a final settling basin by a power pump, the biochemical external discharge of water is reduced, and the biochemical effluent water COD index is improved.

Description

technical field [0001] The invention belongs to the technical field of biochemical treatment of coal chemical industry, in particular, the invention relates to a post-coagulation treatment process of coking sewage. Background technique [0002] The coal coking sewage treatment system is mainly divided into three parts: pretreatment, biochemical treatment and physical and chemical treatment. The external drainage indicators are all high, and the biochemical effluent COD (chemical oxygen demand) indicator is low. With the increasingly stringent relevant environmental protection regulations, the effluent indicators can no longer meet the effluent standards stipulated by the current relevant environmental protection regulations. Contents of the invention [0003] The invention provides a post-coagulation treatment process for coking sewage, aiming at reducing the amount of biochemical external drainage and improving the COD index of biochemical effluent. [0004] In order to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F11/12
CPCC02F1/52C02F11/12C02F2001/007
Inventor 许万国王鹏李善宁
Owner MAANSHAN IRON & STEEL CO LTD