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Acrylonitrile waste water 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. It can solve the problems of long process flow, low removal efficiency, and high operating cost. Achieve the effects of high removal efficiency, low operating cost, and enhanced denitrification effect

Active Publication Date: 2015-05-27
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to overcome the problems of low removal efficiency, substandard effluent, long process flow and high operating cost in the treatment of acrylonitrile wastewater in the prior art, and provide a new treatment method for acrylonitrile wastewater

Method used

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  • Acrylonitrile waste water treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Water quality of an acrylonitrile wastewater: COD is 3000mg / L, NH 3 -N is 40 mg / L, TN is 495 mg / L.

[0035] The acrylonitrile wastewater first enters the short-range nitrification and denitrification tank, and is mixed with the internal circulation reflux liquid, the anoxic tank reflux liquid and the sedimentation tank reflux sludge; the air lifter is used to circulate the mixed liquid internally, and the internal circulation flow rate is 25 times of the influent water; The DO in the control tank is 0.4mg / L, the pH is 7.8, the temperature is 20°C, and the sludge concentration is 6000mg / L.

[0036] The effluent of the short-range nitrification and denitrification tank is divided into two routes: one is lifted into the anoxic tank by a pump, and its lifting flow rate is 3.5 times that of the influent water, and methanol is added to the tank, and the dosage is calculated according to the carbon-nitrogen ratio of 3:1. The DO in the anoxic tank is 0.1mg / L, the pH is 7.5, th...

Embodiment 2

[0040] Water quality of an acrylonitrile wastewater: COD is 3500mg / L, NH 3 -N is 45 mg / L and TN is 520 mg / L.

[0041] The acrylonitrile wastewater first enters the short-range nitrification and denitrification tank, and is mixed with the internal circulation reflux liquid, the anoxic tank reflux liquid and the sedimentation tank reflux sludge; the air lifter is used to circulate the mixed liquid internally, and the internal circulation flow rate is 30 times that of the influent water; The DO in the control tank is 0.5mg / L, the pH is 8.1, the temperature is 30°C, and the sludge concentration is 8000mg / L.

[0042] The effluent of the short-range nitrification and denitrification tank is divided into two routes: one is lifted by the pump and enters the anoxic tank, and its flow rate is 2.8 times that of the influent water, and methanol is added to the tank, and the dosage is calculated according to the carbon-nitrogen ratio of 4:1. The DO in the oxygen tank is 0.3mg / L, the pH is...

Embodiment 3

[0046] The mixed water quality of a certain acrylonitrile wastewater and other wastewater: COD is 1500mg / L, NH 3 -N is 33 mg / L and TN is 220 mg / L.

[0047] The acrylonitrile wastewater first enters the short-range nitrification and denitrification tank, and is mixed with the internal circulation reflux liquid, the anoxic tank reflux liquid and the sedimentation tank reflux sludge; the air lifter is used to circulate the mixed liquid internally, and the internal circulation flow rate is 10 times of the influent water; The DO in the control tank is 0.3mg / L, the pH is 7.5, the temperature is 25°C, and the sludge concentration is 4000mg / L.

[0048] The effluent of the short-range nitrification and denitrification tank is divided into two ways: one is lifted by the pump and enters the anoxic tank, and its flow rate is 5 times that of the influent water, and ethanol is added to the tank. The DO in the oxygen tank is 0.2mg / L, the pH is 7.3, the temperature is 30°C, the sludge concen...

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Abstract

The invention relates to an acrylonitrile waste water treatment method, which is mainly used for solving the problems of low efficiency of removing COD (Chemical Oxygen Demand) and TN (Total Nitrogen), yielding water of non-compliance, long process flow and high operation cost of acrylonitrile waste water treatment in the prior art. The acrylonitrile waste water treatment method provided by the invention comprises the following steps: (1) firstly feeding the acrylonitrile waste water into a short-cut nitrification and denitrification tank; (2) dividing the efflux of the short-cut nitrification and denitrification tank into two branches, and feeding one branch into an anaerobic tank, returning the mixed liquid of the anaerobic tank to the short-cut nitrification and denitrification tank, and feeding the other branch into the sedimentation tank; (3) returning one part of sludge at the bottom of the sedimentation tank to the short-cut nitrification and denitrification tank, and discharging one part as sludge, and feeding the supernatant into an advanced oxidation pond; (4) feeding the efflux of the advanced oxidation pond into a biological aerated filter to obtain the waste water for discharge which is up to the A-level standard of Integrated Wastewater Discharge Standard GB8978-1996; the technical scheme can be used for well solving the problems; therefore, the acrylonitrile waste water treatment method can be applied to industrial treatment of the acrylonitrile waste water.

Description

technical field [0001] The invention relates to a treatment method for acrylonitrile waste water. Background technique [0002] Acrylonitrile is mainly used in the production of acrylic fiber, nitrile rubber, adiponitrile, acrylamide, ABS resin, etc., and can also be used in the production of caprolactam and polyol polymers. It has broad applications in the fields of synthetic fibers, synthetic rubber, and plastics. Prospects, the demand for acrylonitrile in my country and even the world is growing strongly, and acrylonitrile production facilities will continue to be launched. There are four production methods of acrylonitrile: cyanohydrin method, acetylene method, propylene ammoxidation method and propane ammoxidation method. At present, the most widely used method at home and abroad is the propylene ammoxidation method. Under certain reaction conditions and the action of a catalyst, acrylonitrile and water are generated, and by-products are mainly acetonitrile and hydrocya...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 何小娟
Owner SINOPEC SHANGHAI ENG
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