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Acrylonitrile wastewater treatment method

A technology for acrylonitrile wastewater and treatment methods, which is applied in natural water treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., and can solve high risk, high cleaning and maintenance costs, and poor biodegradability of nitrile-containing wastewater and other problems, to achieve the effect of high pollutant removal efficiency, low operating cost and simple process

Inactive Publication Date: 2018-12-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is: when the organic carbon source is not sufficient, the removal effect of COD and total nitrogen is difficult to guarantee
The disadvantages are: when the total nitrogen is removed by the A / O process, a higher carbon-to-nitrogen ratio in the sewage is required to achieve a higher nitrogen removal efficiency, and the biodegradability of nitrile-containing wastewater is very poor, and it is difficult to provide a large amount of biodegradable carbon sources, the utility model does not mention the way of supplementing biodegradable carbon sources
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

[0045] 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.

[0046] (1) homogeneous:

[0047] 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.

[0048] (2) Acidification:

[0049] The effluent from the homogeneous tank enters the acidification tank for acidification treatment. A submerged ...

Embodiment 2

[0062] 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.

[0063] (1) homogeneous:

[0064] 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.

[0065] (2) Acidification:

[0066] The effluent from the homogeneous tank enters the acidification tank for acidification treatment. A submerged agitat...

Embodiment 3

[0077] 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.

[0078] (1) homogeneous:

[0079] 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.

[0080] (2) Acidification:

[0081]The effluent from the homogeneous tank enters the acidification tank for acidification treatment. A submerged agitator is...

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Abstract

The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to an acrylonitrile wastewater treatment method, which comprises: homogenization, acidification, denitrification, nitrification, and precipitation. According to the present invention, good-biodegradability TMPD wastewater as the carbon source can be supplemented to the acrylonitrile wastewatertreatment; by adding the filler to the nitrification pool, the ratio of the BOD to the total nitrogen in the mixed sewage can be reduced, such that the wastewater consumption is reduced by 20% whilethe COD removal rate of the acrylonitrile wastewater is increased by 20% compared to the method in the prior art; the total nitrogen in the effluent the biochemical system meets the national emissionstandard so as to maximally utilize the TMPD wastewater, such that the waste is treated with the waste, the cost is reduced, and the effect is increased; and the method is suitable for acrylonitrile wastewater treatment, and has characteristics of high pollutant removal efficiency, standard effluent, simple process and low operation 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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IPC IPC(8): C02F3/30C02F101/38C02F103/36
CPCC02F3/30C02F3/302C02F2101/38C02F2103/36
Inventor 黄斌潘咸峰
Owner CHINA PETROLEUM & CHEM CORP
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