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Method for treating and recycling coking wastewater

A technology for coking wastewater and water quality, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., to achieve significant economic benefits and reduce the amount of replenishment.

Active Publication Date: 2012-06-27
云南天朗环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]With the continuous deepening of the national sustainable development strategy, circular economy, clean production, environmental protection measures and other work have put forward higher requirements for coking wastewater pollution control , not only have requirements for the water quality after coking wastewater treatment, but also have requirements for the amount of new water taken, higher requirements for the water quality of direct discharge and indirect discharge, requirements for the results of water pollution control, and requirements for the production of water pollution. The process also has requirements. Coking enterprises, which are generally considered to be high-pollution industries, are facing increasing pressure on water pollution control. The nitrification-denitrification process commonly used by existing coking enterprises has gradually been unable to fully meet the above requirements. Coking enterprises are also actively seeking new technologies for effective, reliable and economical coking wastewater treatment and reuse

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  • Method for treating and recycling coking wastewater

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Effect test

Embodiment 1

[0021] A kind of coking wastewater treatment and recycling method provided by the present invention, through the following process steps:

[0022] A. Send the coking wastewater to the degreasing tank to remove heavy oil and some light oil, then send it to the air flotation tank for air flotation degreasing treatment, and then send it to the homogenization tank for water quality homogenization treatment until the water quality is as follows: pH 6, Volatile phenol is 590mg / L, cyanide is 48mg / L, petroleum is 47mg / L, COD is 3800mg / L, NH 3 -N is 590mg / L, and then sent to the anoxic tank for denitrification and denitrification treatment, so that the NO in the wastewater 3 － , NO 2 － Reduced to nitrogen and escaped into the atmosphere;

[0023] B. Send the coking wastewater treated in step A into the aerobic tank, blow in the air with a blower, replenish industrial water and return sludge from the sedimentation tank, and add industrial grade soda ash (Na 2 CO 3 ) and industrial...

Embodiment 2

[0029] A kind of coking wastewater treatment and recycling method provided by the present invention, through the following process steps:

[0030] A. Send the coking wastewater to the degreasing tank to remove heavy oil and some light oil, then send it to the air flotation tank for air flotation degreasing treatment, and then send it to the homogenization tank for water quality homogenization treatment until the water quality is as follows: pH value 12 , Volatile phenol is 570mg / L, cyanide is 47mg / L, petroleum is 46mg / L, COD is 3600mg / L, NH 3 -N is 550mg / L, and then sent to the anoxic tank for denitrification and denitrification treatment, so that the NO in the wastewater 3 － , NO 2 － Reduced to nitrogen and escaped into the atmosphere;

[0031] B. Send the coking wastewater treated in step A into the aerobic tank, blow in the air with a blower, replenish industrial water and return sludge from the sedimentation tank, and add industrial grade soda ash (Na 2 CO 3 ) and in...

Embodiment 3

[0037] A kind of coking wastewater treatment and recycling method provided by the present invention, through the following process steps:

[0038] A. Send the coking wastewater to the degreasing tank to remove heavy oil and some light oil, then send it to the air flotation tank for air flotation degreasing treatment, and then send it to the homogenization tank for water quality homogenization treatment until the water quality is as follows: pH value 10 , Volatile phenol is 600mg / L, cyanide is 50mg / L, petroleum is 50mg / L, COD is 4000mg / L, NH 3 -N is 600mg / L, and then sent to the anoxic tank for denitrification and denitrification treatment, so that the NO in the wastewater 3 － , NO 2 － Reduced to nitrogen and escaped into the atmosphere;

[0039] B. Send the coking wastewater treated in step A into the aerobic tank, blow in the air with a blower, replenish industrial water and return sludge from the sedimentation tank, and add industrial grade soda ash (Na 2 CO 3 ) and in...

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Abstract

The invention provides a method for treating and recycling coking wastewater. The coking wastewater is separated to obtain upper clear water after oil removing, air flotation, equalizing, anaerobic treatment, aerobic treatment and sedimentation treatment, the upper clear water is separated to obtain upper clear water after microwave treatment, a coagulation reaction and sedimentation, a part of the upper clear water achieves a recycled water standard of CEC 61:94 after sand leach treatment to become first recycled water and is recycled as cooling water, and the rest of the upper clear water achieves an industrial water quality standard specified by B50050-2007 after desalination treatment to become second recycled water and is recycled as supplement water. Separated sludge is mixed and sediments to be filter-pressed into cakes, and the cakes are returned to coal blending and take part in coking. The coking wastewater is all recycled in branch points and branch areas inside integrated steel and iron enterprises, zero-discharging is achieved, and the problems in current coking wastewater of being hard to treat and recycle are solved. The wastewater can not pollute environment anymore, resource recycling of wastewater is achieved, and fresh water supplement quantity is reduced.

Description

[0001] technical field [0002] The invention relates to a method for treating and reusing coking wastewater, which belongs to the technical field of sewage treatment. Background technique [0003] Coking wastewater is the wastewater formed during the high-temperature dry distillation of coal, as well as the process of gas purification and chemical product refining. The pollutants in coking wastewater are various and complex, such as benzene, phenols, sulfides, cyanides, naphthalene, Anthracene and other polycyclic and heterocyclic aromatic hydrocarbons, etc. Coking wastewater is toxic, harmful, and refractory high-concentration wastewater, which is extremely harmful, and whether it is organic or inorganic pollutants, most of them are toxic, harmful or carcinogenic substances, of which organic pollutants are mostly phenolic compounds, accounting for about Half of organic matter, including polycyclic aromatic compounds and heterocyclic compounds containing nitrogen, oxygen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 曹阳曹吉良张燕玲杨崇德赵明华
Owner 云南天朗环境科技有限公司
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