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Method for deep treatment of biochemical tail water of coking wastewater

A technology for advanced treatment of coking wastewater, which is applied in the field of wastewater treatment and advanced treatment of coking wastewater. It can solve the problems of secondary pollution effluent COD concentration, etc., and achieve the effects of reducing pollutant dissipation, accelerating sedimentation speed, and reducing effluent COD.

Active Publication Date: 2015-04-29
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the pollutants in the existing coking wastewater advanced treatment process are prone to secondary pollution and the effluent COD concentration is too high, a method for advanced treatment of coking wastewater biochemical tail water is provided

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  • Method for deep treatment of biochemical tail water of coking wastewater

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Embodiment 1

[0024] figure 1 The method for advanced treatment of coking wastewater biochemical tail water in this embodiment includes:

[0025] (1) Feed the long-flame coal as the coal for adsorption into the crusher for crushing to obtain a crushed product with a particle size of 3mm;

[0026] (2) Feed the crushed product into the ore mill for grinding to obtain a grinding product with a particle size of less than 200 mesh and a material content of 80wt%, that is, pulverized coal;

[0027] (3) Send biochemically treated coking wastewater with a chemical oxygen demand (COD) value of 198mg / L into the mixing tank, and add sulfuric acid solution into the mixing tank to adjust the pH value of the water to 3. 2) Add the grinding product in the amount of 30g / L into the mixing tank 7 for stirring and mixing to obtain the stirring product;

[0028] (4) Send the stirred product from step (3) into a concentrator for concentration, and add polyaluminum sulfate 600g / t dry coal powder and polyacryla...

Embodiment 2

[0033] (1) Feed the coking raw material coal of the coking plant into the grinding machine for grinding, and obtain the grinding product with a particle size of less than 200 mesh and a material content of 83wt%, that is, coal powder;

[0034] (2) Send biochemically treated coking wastewater with a chemical oxygen demand (COD) value of 176mg / L into the mixing tank, and add sulfuric acid solution into the mixing tank to adjust the pH value of the water to 4. 1) The grinding product of 50g / L is added to the mixing tank and stirred and mixed to obtain the stirred product;

[0035](3) Transfer the stirred product from step (2) to the concentrator for concentration, and add polyaluminum sulfate 650g / t dry coal powder and polyacrylamide 40g / t dry coal powder to the concentrator to obtain overflow water and Concentrated underflow;

[0036] (4) Feed the concentrated underflow from step (3) into a filter press for dehydration by pressure filtration to obtain filtrate and dehydrated br...

Embodiment 3

[0039] figure 1 The method for advanced treatment of biochemical tail water of coking wastewater in this embodiment includes,

[0040] (1) Feed the coking coal as the coal for adsorption into the crusher for crushing to obtain a crushed product with a particle size of 5mm;

[0041] (2) Feed the crushed product into the ore mill for grinding to obtain a grinding product with a particle size of less than 200 mesh and a material content of 90wt%, that is, pulverized coal;

[0042] (3) Send biochemically treated coking wastewater with a chemical oxygen demand (COD) value of 234mg / L into the mixing tank, and add sulfuric acid solution into the mixing tank to adjust the pH value of the water body to 5. 2) Add the grinding product in the amount of 75g / L to the mixing tank 7 for stirring and mixing to obtain the stirring product;

[0043] (4) Send the stirred product from step (3) into a concentrator for concentration, and add polyaluminum sulfate 680g / t dry coal powder and polyacry...

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Abstract

The invention discloses a method for deep treatment of biochemical tail water of coking wastewater. The method comprises the following steps: 1, pulverizing and grinding coal for absorption to obtain coal powder; 2, adding an acid solution into biochemically treated coking wastewater, regulating the pH value of a water body to 2-6, then adding the coal powder, and agitating and mixing to obtain agitating products; 3, separating the solid agitating product from the liquid agitating product to obtain a dehydrated coal cake and effluent; preferably, adding polyaluminium sulfate and polyacrylamide into the agitating products, carrying out concentrating treatment by a concentrator to obtain overflow water and concentrated bottom flow, carrying out filter pressing and dehydration on the concentrated bottom flow to obtain filtrate and the dehydrated coal cake, returning the overflow water back to the concentrator, and obtaining final effluent by the concentrator. Through the change of the existing forms of complexing macromolecules in the waste water in an acid environment, the coal powder absorbing function is improved, and the use quantity of the coal powder is reduced. The effluent indexes reach the requirements of Emission Standards of Pollutants for Coking Chemical Industry (GB16171-2012).

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to an advanced treatment method for coking wastewater after biochemical treatment, and belongs to the technical field of sewage treatment. Background technique [0002] Coking wastewater is industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds such as oxygen, sulfur, and nitrogen produced during coking and coal gas high-temperature dry distillation, purification, and by-product recovery. It is a high-COD, high-volatility phenol, high- Ammonia nitrogen and difficult to treat industrial organic wastewater. At present, biological treatment methods are mostly used in the treatment of coking wastewater, such as A-O method, A-A-O method, A-O-O method, SBR method, HSB high-efficiency bacteria method, etc. Wastewater biochemical treatment mainly uses the metabolism of aerobic, anaerobic and / or facultative microbial communities to dec...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 王永田崔永君顾爱萍高丽慧孙浩吴蓬勃杨琰孙志强张晓宁
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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