Acrylonitrile wastewater treatment method

A technology for acrylonitrile wastewater and treatment methods, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high cleaning and maintenance costs and high risks, and improve COD and total nitrogen treatment effect, low operating cost and high removal efficiency

Active Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the COD of the reverse osmosis feed water is as high as 118mg / L, and the cleaning and maintenance costs of the system are very high.

Method used

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  • Acrylonitrile wastewater treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The main water quality characteristics of the wastewater produced by an acrylonitrile factory are that COD is 4000mg / L, BOD / COD is 0.27, ammonia nitrogen is 55mg / L, total nitrogen is 687mg / L, and cyanide is 3mg / L. The main water quality characteristics of wastewater from a TMPD production plant are COD of 98000mg / L and BOD / COD of 0.72.

[0042] (1) homogeneous:

[0043] The acrylonitrile wastewater and TMPD wastewater are mixed at a volume ratio of 18:1 and then enter the homogenization tank. A perforated pipe is installed at the bottom of the homogeneous tank. Compressed air is introduced into the perforated pipe, and the balanced adjustment of water quality is achieved through aeration and stirring. Water quality after adjustment: COD is 8810mg / L, BOD is 5850mg / L, total nitrogen is 650mg / L, and BOD / total nitrogen is 9.0.

[0044] Phosphorus salt is added to the effluent of the homogeneous pool to supplement the phosphorus element required by the biological metabolism...

Embodiment 2

[0057] The main water quality characteristics of the wastewater produced by an acrylonitrile factory are that COD is 2370mg / L, BOD / COD is 0.32, ammonia nitrogen is 42mg / L, total nitrogen is 420mg / L, and cyanide is 2.8mg / L. The main water quality characteristics of wastewater from a TMPD production plant are COD of 72000mg / L and BOD / COD of 0.69.

[0058] (1) homogeneous:

[0059] Acrylonitrile wastewater and TMPD wastewater are mixed at a volume ratio of 25:1 and then enter the homogenization tank. A perforated pipe is installed at the bottom of the homogeneous tank. Compressed air is introduced into the perforated pipe, and the balanced adjustment of water quality is achieved through aeration and stirring. Water quality after adjustment: COD is 4972mg / L, BOD is 3187mg / L, total nitrogen is 418mg / L, BOD / total nitrogen is 7.6.

[0060] Phosphorus salt is added to the effluent of the homogeneous pool to supplement the phosphorus element required by the biological metabolism proce...

Embodiment 3

[0073] The main water quality characteristics of the wastewater produced by an acrylonitrile factory are that COD is 3120mg / L, BOD / COD is 0.42, ammonia nitrogen is 62mg / L, total nitrogen is 625mg / L, and cyanide is 3mg / L. The main water quality characteristics of wastewater from a TMPD production plant are COD of 72000mg / L and BOD / COD of 0.69.

[0074] (1) homogeneous:

[0075] Acrylonitrile wastewater and TMPD wastewater are mixed at a volume ratio of 33:1 and then enter the homogenization tank. A perforated pipe is installed at the bottom of the homogeneous tank, and compressed air is introduced into the perforated pipe to achieve balanced adjustment of water quality through aeration and stirring. Water quality after adjustment: COD is 5150mg / L, BOD is 2950mg / L, total nitrogen is 590mg / L, and BOD / total nitrogen is 5.0.

[0076] Phosphorus salt is added to the effluent of the homogeneous pool to supplement the phosphorus element required by the biological metabolism process. ...

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Abstract

The invention belongs to the technical field of industrial wastewater treatment, and concretely relates to an acrylonitrile wastewater treatment method. The method comprises the steps of homogenization, acidification, denitrification, nitrification and deposition. TMPD wastewater with very good biodegradability can be supplemented in the acrylonitrile wastewater treatment process as a carbon source, so the COD and total nitrogen treatment effect of acrylonitrile wastewater by a system is improved, and the problem of difficult standard reaching of direct treatment of the TMPD wastewater is solved, that is, purposes of waste control by waste, cost reduction and effect improvement are realized; and a new approach is provided for standard reaching treatment of the acrylonitrile wastewater. The method has the characteristics of simple flow and low running cost.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment method for acrylonitrile wastewater. Background technique [0002] Acrylonitrile is a colorless, bitter almond-like highly toxic organic cyanide with high toxicity and potential genotoxicity. It is one of the important harmful pollutants in the environment. It not only destroys the water ecosystem, but also endangers human life. healthy. Acrylonitrile is one of the main raw materials for synthetic fiber, synthetic resin, synthetic rubber and organic synthesis industry. It is mainly used in the production of acrylic fiber, nitrile rubber, adiponitrile, acrylamide and ABS resin. At present, the most widely used production method of acrylonitrile at home and abroad is the ammoxidation of propylene, that is, using propylene, ammonia and air as the main raw materials, under certain reaction conditions (temperature: 445±5°C, pressure: 0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 黄斌潘咸峰邹宗海王建娜
Owner CHINA PETROLEUM & CHEM CORP
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