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Method for treating and recycling coal tar processing wastewater

A technology for processing waste water and coal tar, applied in flotation water/sewage treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of dilute waste water increasing the processing load of biochemical stations, large economic burden, violation of cleanliness Production and other problems, to achieve the effect of solving the difficulty of effluent compliance, improving biochemical properties, and strengthening biochemical treatment

Inactive Publication Date: 2014-04-16
辽宁中冠环境工程股份有限公司
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Problems solved by technology

However, a large amount of diluted wastewater increases the processing load of the biochemical station, virtually increases the energy consumption and cost of sewage treatment, and makes the enterprise bear a huge economic burden, which violates the principle of clean production

Method used

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  • Method for treating and recycling coal tar processing wastewater
  • Method for treating and recycling coal tar processing wastewater
  • Method for treating and recycling coal tar processing wastewater

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Embodiment Construction

[0020] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0021] See figure 1 , is a schematic diagram of the process flow of the method for treating and reusing coal tar processing wastewater of the present invention. This is a combined process method comprising pretreatment, biological treatment and post-treatment, and its process flow is as follows:

[0022] 1) In the pretreatment part I, the processing equipment includes a grease trap 1, an air flotation tank 3 and a hydrolysis acidification adjustment tank 4 connected in sequence. The coal tar processing wastewater A enters the grease trap 1 through the pipe network, and the heavy oil B at the bottom of the pool is collected and then discharged. Transport, the effluent from the grease trap 1 is sent to the air flotation tank 3 through the waste water lifting pump P1, and the air flotation scum C is collected and transported outside. Hydrolysis and ...

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Abstract

The invention relates to the technical field of coal tar processing wastewater treatment and recycle, in particular to a method for treating and recycling coal tar processing wastewater. The method is characterized by being a combined technological method including pretreatment, biological treatment and post-treatment, and comprises the processing steps that: 1) a pretreatment device comprises an oil separation tank, a gas flotation tank, and a hydrolysis and acidification regulation tank connected in sequence; 2) a biochemical treatment device comprises a short-range nitrification tank, an anaerobic ammonium oxidation tank, and an aerobic biological carbon tank connected in sequence; and 3) for the water quality of the discharged water after post-treatment, the COD is lower than 70mg / L, SS is lower than 1 mg / L, and chrominance is less than 15 times. Compared with the prior art, the method of the invention has the beneficial effects that: the biochemical property of the waste water is enhanced by finishing hydrolytic acidification in the regulation tank; and the biological treatment is strengthened through an effective combination of the short-range nitrification tank, the anaerobic ammonium oxidation tank, and the aerobic biological carbon tank; the problem that the coal tar processing wastewater is difficult to reach the standards is solved, and the purpose of recycling the wastewater is achieved.

Description

technical field [0001] The invention relates to the technical field of treatment and reuse of coal tar processing wastewater, in particular to a method for treating and recycling coal tar processing wastewater. Background technique [0002] Coal tar processing and production wastewater has the characteristics of high ammonia nitrogen, high oil content, high toxicity, and low B / C ratio, and belongs to difficult industrial wastewater. At present, the treatment methods of this kind of wastewater in China mainly adopt A / O and AA / O processes. These processes mainly use gravity separation and adsorption methods for oily substances. The removal rate of oily substances is only 20-30%, and the treatment effect is not good. It is very ideal, but it brings great difficulties to the subsequent biochemical treatment. Due to the weak anti-shock load capacity of the biochemical system itself, the limitation of the traditional denitrification reaction mechanism, and the pressure brought by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/40C02F1/24C02F1/52C02F1/56C02F1/28
Inventor 王旭冯卫强魏剑峰代军鞠兴华金旭东刘泽南张丽红张执远
Owner 辽宁中冠环境工程股份有限公司
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