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Method of polymerization and coagulation for treating sewage participating of heavy concentration acrylonitrile

An acrylonitrile wastewater, high concentration technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of incomplete treatment, high cost of wastewater treatment, lack of pretreatment technology, etc., to achieve good treatment effect, low treatment cost, Reasonable effect of craftsmanship

Inactive Publication Date: 2004-06-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of economical and effective pretreatment technology, and only multi-effect evaporation, incineration or dilution methods are used to treat wastewater. The cost of wastewater treatment is high and the treatment is not thorough.

Method used

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  • Method of polymerization and coagulation for treating sewage participating of heavy concentration acrylonitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] This implementation takes the configured high-concentration acrylonitrile wastewater as an example

[0012] Use acrylonitrile (chemically pure reagent) and distilled water to prepare acrylonitrile wastewater with a certain concentration. Take 500ml of waste water and put it in a 1000ml beaker, add a small amount (0.05‰-8‰) of solid analytically pure ammonium persulfate, and react with electromagnetic stirring at 35±2°C for 30-180 minutes. Cool to room temperature, adjust the pH of the wastewater to 7-8 with solid NaOH, then add 0.5% polyaluminium chloride (10% aqueous solution) for coagulation, and let stand to precipitate water. The processing effect detection is as follows:

[0013] Table 1 ammonium persulfate as the acrylonitrile removal effect of initiator

[0014] Response time (minutes) 0 30 45 60 75 90 105 120 150 180

[0015] Waste water quality CODcr 7603 5447 3764 3468 1627 507 494 466 136 85

[0016] (Unit: mg / l)

[0017] Wastewater kCODc...

Embodiment 2

[0024] Use acrylonitrile (chemically pure reagent) and distilled water to prepare acrylonitrile wastewater with a certain concentration. Take 500ml of waste water and put it in a 1000ml beaker, add a small amount (0.05‰-8‰) of solid analytically pure potassium persulfate, and stir electromagnetically at 35±2°C for 30-180 minutes. Cool to room temperature, adjust the pH of the wastewater to 7-8 with solid NaOH, then add 0.5% polyaluminium chloride (10% aqueous solution) for coagulation, and let stand to precipitate water. The processing effect detection is as follows:

[0025] Table 2 Potassium persulfate as the acrylonitrile removal effect of initiator

[0026] Response time (minutes) 0 30 45 60 75 90 105

[0027] Waste water quality CODcr 7603 4299 3216 1764 1012 496 192

[0028] (Unit: mg / l)

[0029] Removal % / 39 58 77 86 93 97

Embodiment 3

[0031] Use acrylonitrile (chemically pure reagent) and distilled water to prepare acrylonitrile wastewater with a certain concentration. Take 500ml of waste water and put it in a 1000ml beaker, add a small amount (0.05‰-8‰) of solid analytically pure sodium chlorate, and stir electromagnetically at 35±2°C for 30-180 minutes. Cool to room temperature, adjust the pH of the wastewater to 7-8 with solid NaOH, then add 0.5% polyaluminium chloride (10% aqueous solution) for coagulation, and let stand to precipitate water. The processing effect detection is as follows:

[0032] Table 3 Sodium chlorate is as the acrylonitrile removal effect of initiator

[0033] Response time (minutes) 0 30 45 60 75 90 105

[0034] Waste water quality CODcr 7603 5143 4583 3995 2302 1247 578

[0035] (Unit: mg / l)

[0036] Removal % / 32 40 47 70 84 92

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Abstract

The pollutant acrylonitrile in high concentration waste water with acrylonitrile content of 2800-7603 mg / L is polymerized with solid ammonium persulfate, solid potassium persulfate, solid sodium chlorate or hydrogen peroxide as polymerization initiator at the reaction temperature of 10-70 deg.c while stirring electromagnetically or mechanically. The polymerized pollutant acrylonitrile is then eliminated through coagulation with polyaluminium chloride or polyferric sulfate as coagulant. When the polymerization time is 105 min, acrylonitrile eliminating rate as high as 96 % may be obtained and CODCr eliminating rate is 66-99 %. The present invention has simple and reasonable technological process, high waste water treating effect and low treating cost.

Description

Technical field [0001] The patent of the present invention relates to the pretreatment technology of high-concentration acrylonitrile wastewater, which can change the current environmental pollution and high-cost treatment conditions caused by the lack of pretreatment technology to a certain extent. Background technique [0002] Industrial wastewater is the main source of environmental pollution. The discharge of high-concentration organic wastewater is large, and the industries and regions involved are widely distributed. Especially when there are high-concentration organic or toxic substances in the wastewater, wastewater treatment is more difficult. . From the perspective of treatment practice, the key to the treatment of high-concentration organic wastewater lies in the practical pretreatment technology that is technically effective, feasible and economically reasonable. [0003] At present, the methods for treating high-concentration organic wastewater mainly include e...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 李坚马莉锋
Owner ZHEJIANG UNIV OF TECH
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