Method for improving denitrification rate of acrylonitrile waste water

A technology for acrylonitrile wastewater and denitrification rate, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of effluent COD or TN not up to standard, low removal efficiency, etc. , to achieve the effect of improving TN removal rate, low operating cost and simple process

Active Publication Date: 2014-03-26
SINOPEC SHANGHAI ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to overcome the problems of low removal efficiency and substandard effluent COD or TN in the treatment of acrylonitrile wastewater in the prior art, and provide a new method for improving the denitrification efficiency of acrylonitrile wastewater

Method used

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  • Method for improving denitrification rate of acrylonitrile waste water
  • Method for improving denitrification rate of acrylonitrile waste water
  • Method for improving denitrification rate of acrylonitrile waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Water quality of an acrylonitrile wastewater: COD is 3500mg / L, NH 3 -N is 45 mg / L and TN is 520 mg / L.

[0037] The acrylonitrile wastewater first enters the short-range nitrification and denitrification tank, and is mixed with the internal circulation 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 7.8, the temperature is 30°C, and the sludge concentration is 8000mg / L.

[0038] The effluent of the short-range nitrification and denitrification tank enters the anoxic tank, and methanol is added to the tank. The dosage is calculated according to the carbon-nitrogen ratio of 5:1. The DO of the anoxic tank is 0.3mg / L, the pH is 7.8, and the temperature is 35 ℃, the sludge concentration is 8000mg / L, a submersible agitator is installed in the anoxic tank to realize the internal...

Embodiment 2

[0044] Water quality of an acrylonitrile wastewater: COD is 2850mg / L, NH 3 -N is 35 mg / L and TN is 356 mg / L.

[0045] The acrylonitrile wastewater first enters the short-range nitrification and denitrification tank, and is mixed with the internal circulation 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 that of the influent water; the DO in the control tank is 0.4mg / L, the pH is 8.0, the temperature is 20°C, and the sludge concentration is 6000mg / L.

[0046] The effluent of the short-range nitrification and denitrification tank enters the anoxic tank, and methanol is added to the tank. The dosage is calculated according to the carbon-nitrogen ratio of 4:1. The DO of the anoxic tank is 0.2mg / L, the pH is 7.5, and the temperature is 25 ℃, the sludge concentration is 6000mg / L, a submersible agitator is installed in the anoxic tank to realize the internal...

Embodiment 3

[0052] 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.

[0053] The acrylonitrile wastewater first enters the short-range nitrification and denitrification tank, and is mixed with the internal circulation 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 the influent; the DO in the control tank is 0.3mg / L, the pH is 7.5, the temperature is 15°C, and the sludge concentration is 4000mg / L.

[0054] The effluent of the short-range nitrification and denitrification tank enters the anoxic tank, and methanol is added to the tank. The dosage is calculated according to the carbon-nitrogen ratio of 3:1. The DO of the anoxic tank is 0.1mg / L, the pH is 7.2, and the temperature is 20 ℃, the sludge concentration is 4000mg / L, a submersible agitator is installed in the anoxic tank...

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Abstract

The method relates to a method for improving the denitrification rate of acrylonitrile waste water, and mainly solves the problems that the removal efficiency is relatively low and the effluent COD (Chemical Oxygen Demand) or TN (Total Nitrogen) cannot reach the standard during the acrylonitrile waste water treatment in the prior art. The method for improving the denitrification rate of the acrylonitrile waste water adopted by the invention comprises the following steps: (1) the acrylonitrile waste water enters a partial nitrification denitrification tank; (2) substances flowing out from the partial nitrification denitrification tank enters an oxygen-poor tank; (3) substances flowing out from the oxygen-poor tank enters a primary settling pond, substances flowing out from the upper part of the oxygen-poor tank enters an aerobiotic tank, and at least one part of bottom sludge of the oxygen-poor tank is discharged; (4) upper part substances flowing out from the aerobiotic tank enters a secondary settling pond, upper clean liquid of the aerobiotic tank enters an advanced oxidation tank, and the bottom sludge of the aerobiotic tank is discharged; (5) substances flowing out from the advanced oxidation tank enters a biological aerated filter to contact with the porous filter material and air, the waste water up-to-standard release technical scheme solve the problem in the prior art well, and the method can be applied to the industrial treatment of the acrylonitrile waste water.

Description

technical field [0001] The invention relates to a method for improving the nitrogen removal rate of acrylonitrile wastewater. Background technique [0002] The important characteristics of acrylonitrile wastewater are high chemical oxygen demand (hereinafter referred to as COD), high total nitrogen (hereinafter referred to as TN), and contain toxic components such as acrylonitrile and cyanide, which are difficult to treat. [0003] Since my country's sewage discharge standard only has NH for industrial wastewater 3 -N control index has not been included in the control index of TN. Therefore, when selecting acrylonitrile wastewater treatment process, only the nitrification of ammonia nitrogen is often considered, or, even if a treatment process with denitrification function is selected, the denitrification rate of nitrate nitrogen is not considered in the value of the design parameters (i.e. denitrification rate Nitrogen efficiency), the effluent TN is not assessed during a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 何小娟张之骅徐志奇邓国华
Owner SINOPEC SHANGHAI ENG
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