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Acrylonitrile/acrylon production comprehensive wastewater treatment technique

A technology for treatment process and production wastewater, which is applied in natural water treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problem of affecting the discharge of acrylic fiber wastewater treatment standards and not considering the removal of total nitrogen in wastewater. , low efficiency of microbial degradation of pollutants, etc., to achieve the effect of improving biodegradability, reducing operating costs, and improving treatment effects

Active Publication Date: 2013-12-04
BEIJING CCESS ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(4) Wastewater contains EDTA and polyoxyethylene ether, which affects the standard discharge of acrylic fiber wastewater treatment
Due to the presence of a large number of substances that are toxic to microorganisms in wastewater, the efficiency of microbial degradation of pollutants is low, and a long treatment process is adopted immediately to maintain a long hydraulic retention time, and it is still difficult to meet the discharge standards for discharged sewage
[0008] 3. Does not consider the removal of total nitrogen in wastewater

Method used

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  • Acrylonitrile/acrylon production comprehensive wastewater treatment technique
  • Acrylonitrile/acrylon production comprehensive wastewater treatment technique
  • Acrylonitrile/acrylon production comprehensive wastewater treatment technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A comparative test of pretreatment was carried out for the monomer stripping tower wastewater of an acrylic fiber production unit in an acrylic fiber factory. The comparative test mainly investigates the effect of Fenton oxidation directly on monomer stripper wastewater and air aeration oxidation + Fenton oxidation on the treatment effect.

[0037] 1. Test 1: If figure 1 As shown, the monomer stripping tower wastewater 1 of the acrylic fiber production unit was directly subjected to the Fenton oxidation process test. Take 800ml monomer stripper waste water 1, heat the temperature to 70°C, then place it on a constant temperature stirrer, add 4.8ml H 2 o 2 (27.5%, v%), 0.6g FeSO 4 , reacted for 120min; after the reaction, adjust the pH value of the effluent to about 7.0, add 3.2ml of polyaluminum chloride (10%, w%), and react for 1min at a stirring speed of 120r / min, and at a stirring speed of 60r / min The reaction was carried out for 10 minutes, and the supernatant wa...

Embodiment 2

[0045] An acrylic fiber factory includes two sets of acrylonitrile and acrylic fiber production units. First, the acrylic fiber wastewater is pretreated, and then mixed with acrylonitrile production wastewater, domestic sewage in the factory area, and drainage from auxiliary facilities for biochemical treatment.

[0046] 1. Acrylic wastewater pretreatment system

[0047] Such as figure 1 As shown, the waste water 1 discharged from the monomer stripping tower of the acrylic fiber production unit is aerated and oxidized by air in the aeration tower 2 at a temperature of 70-90°C at a gas-water volume ratio of 1:30-100, and the reaction time is 2 hours. Oxidize sulfite in wastewater to sulfate. FeSO is then added in the Fenton oxidation process 3 4 and H 2 o 2 Perform Fenton oxidation to remove and decompose oligomers and refractory organic matter in wastewater, and increase the B / C value of wastewater while reducing CODcr of wastewater. FeSO 4 Adding amount is 0.75Kg / m 3 ...

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Abstract

The invention relates to an acrylonitrile / acrylon production comprehensive wastewater treatment technique which aims at the acrylonitrile / acrylon production comprehensive wastewater. The technique comprises the following steps: pretreating acrylon production wastewater by air aeration oxidation, Fenton oxidation, flocculating settling and the like to remove sulfites, low polymers EDTA (ethylene diamine tetraacetic acid), polyethenoxy ether and other nonbiodegradable toxic and harmful pollutants in the wastewater; and mixing with acrylonitrile production wastewater, and carrying out biochemical treatment, including anaerobic treatment, anoxic treatment, aerobic treatment, nitrification and the like, thereby discharging water reaching the standard. The invention is characterized in that the pretreatment is carried out according to the water quality characteristics of the acrylon wastewater to remove the nonbiodegradable toxic and harmful substances in the acrylon wastewater, thereby enhancing the biodegradability of the acrylon wastewater and laying foundation for the subsequent biochemical treatment.

Description

technical field [0001] The invention relates to a process for treating comprehensive wastewater generated in the production process of acrylonitrile and acrylic fibers. Background technique [0002] In the process of acrylic fiber production, due to the addition of raw materials such as dimethylformamide (DMF), acrylonitrile (AN), EDTA, polyoxyethylene ether, etc., polyacrylonitrile with different relative molecular masses is generated in the polymerization reaction, so the pollution of acrylic fiber wastewater The main substances are sulfates, sulfites, AN, DMF, EDTA, sodium propionitrile sulfonate, organic amines, oil agents and polyacrylonitrile oligomers. According to the pollutants in the acrylic wastewater, the acrylic wastewater has the following four characteristics: (1) more than 10 kinds of raw materials are added in the production, and various high polymers and by-products with different relative molecular masses are generated in the polymerization reaction at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/38
Inventor 王甦
Owner BEIJING CCESS ENVIRONMENT TECH CO LTD
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