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Coal chemical industrial wastewater treating and recycling method combined with coal dressing process

A technology for coal chemical wastewater and biochemical treatment, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost and non-zero discharge of wastewater, and achieve flexible methods, Taking into account the effects of treatment, economic treatment and utilization

Inactive Publication Date: 2013-01-23
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coal chemical wastewater treatment and utilization method combined with the coal preparation process to solve the problems of high cost of various combined processes for the existing coal chemical wastewater treatment and the inability to truly achieve "zero discharge" of wastewater.

Method used

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  • Coal chemical industrial wastewater treating and recycling method combined with coal dressing process
  • Coal chemical industrial wastewater treating and recycling method combined with coal dressing process
  • Coal chemical industrial wastewater treating and recycling method combined with coal dressing process

Examples

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Embodiment 1

[0026] Example 1: figure 1 For the coal chemical industry wastewater treatment and utilization method of the present invention, the coal chemical industry wastewater is treated and utilized in cooperation with pretreatment, biochemical treatment and coal preparation process, and the wastewater treatment method comprises the following steps:

[0027] ① Pass the coal chemical wastewater in the wastewater regulating tank into the pretreatment unit for pretreatment;

[0028] ② Passing the pretreated waste water into the biochemical unit for biochemical treatment;

[0029] ③ Passing the biochemically treated wastewater into a coagulation sedimentation tank for coagulation and sedimentation treatment;

[0030] Wastewater utilization methods are:

[0031] ④ Pass the wastewater after the sedimentation treatment into the coal slime water buffer pool of the coal preparation plant, and use it as water for coal preparation; during the coal preparation process, refractory organic matter ...

Embodiment 2

[0036] Example 2: figure 2 A specific embodiment of the coal chemical wastewater treatment and utilization method combined with the coal preparation process of the present invention is provided, including the following steps:

[0037] ①The coal chemical industry wastewater in the regulating tank is passed into the pretreatment unit, which regulates the homogeneity and quantity of the wastewater, and the pretreatment unit reduces pollutants by means of oil separation, air flotation, precipitation and hydrolysis acidification content and improve the biodegradability of wastewater.

[0038] ② Pass the pretreated waste water into the aerobic pool. The aerobic pool can be one level or multi-level. The aerobic process can be activated sludge or biofilm process. In this embodiment, the aerobic pool Biological aerated filter and biological aerated fluidized bed technology are adopted in sequence.

[0039] ③ Passing the biochemically treated wastewater into a coagulation sedimentati...

Embodiment 3

[0042] Embodiment 3: The biochemical treatment can pass through the anoxic pool and the aerobic pool in turn. image 3 For the coal chemical industry wastewater treatment and utilization method process combined with the coal preparation process, the specific steps are as follows:

[0043] ① Pass the coal chemical industry wastewater in the regulating tank into the pretreatment unit. This embodiment adopts the pretreatment method of precipitation and hydrolysis acidification. After the wastewater passes through, the pollutant content in it is reduced and the biodegradability of the wastewater is improved.

[0044] ② Pass the pretreated wastewater into the biochemical unit for biochemical treatment. In this embodiment, the biochemical unit includes an anoxic pool and an aerobic pool. The anoxic pool selects anoxic biological filter, and the aerobic pool selects exposure Gas biofilter. After pretreatment, the wastewater passes through the anoxic pool and the aerobic pool in turn...

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Abstract

The invention discloses a coal chemical industrial wastewater treating and recycling method combined with a coal dressing process, belonging to a wastewater treating and recycling method. Wastewater is subjected to pretreatment, biochemical treatment and coagulation treatment to be finally used as coal dressing water. The coal chemical industrial wastewater treating and recycling method specifically comprises the steps of: 1, introducing coal chemical industrial wastewater in a wastewater regulating tank into a pretreatment unit for being pretreated; 2, introducing the pretreated wastewater into a biochemical unit for being biochemically treated; 3, introducing the biochemically treated wastewater into a coagulative precipitation tank for being subjected to coagulative precipitation; and 4, introducing the wastewater subjected to the coagulative precipitation into a coal slime water buffer tank of a coal dressing plant to be used as the coal dressing water. Residual refractory organics in the coal dressing process are absorbed on surfaces of coal particles; and water is recycled in the closed cycle of the coal dressing plant. According to the coal chemical industrial wastewater treating and recycling method, coal chemical industrial wastewater is efficiently and economically treated and recycled, zero emission and recycling of the wastewater and organic pollutants in the wastewater are realized, the treatment cost is lowered, the environment is protected, and water resources are saved.

Description

technical field [0001] The invention relates to a coal chemical wastewater treatment and utilization method combined with a coal preparation process, in particular to a wastewater treatment and utilization method. Background technique [0002] Coal chemical industry refers to the industry that uses coal as raw material, converts coal into gas, liquid and solid products or semi-products through chemical processing, and then further processes them into chemical and energy products. The wastewater produced by the coal chemical industry is characterized by a complex composition, containing a large amount of phenols, polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, oxygen, sulfur, and toxic and harmful substances such as cyanide, oil, ammonia nitrogen, etc. One of the most difficult waste water to treat outside. [0003] The current common coal chemical wastewater treatment processes are generally divided into pretreatment, secondary treatment and advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 张明青刘炯天
Owner CHINA UNIV OF MINING & TECH
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