Unlock instant, AI-driven research and patent intelligence for your innovation.

Treatment method of polyacrylonitrile fiber production sewage

A polyacrylonitrile fiber, sewage production technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of large flocculants, etc.

Active Publication Date: 2013-02-20
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned existing methods for treating polyacrylonitrile fiber production sewage all need to use a relatively large amount of flocculant

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example is used to illustrate the treatment method of the polyacrylonitrile fiber production sewage of the present invention.

[0028] The waste water (containing 0.009% by mass of polyacrylonitrile) produced in the polymerization process in the production process of polyacrylonitrile fibers is passed into the reaction tank, the pH of the material in the reaction tank is adjusted to 9, the temperature is controlled at 170 ° C, and the pressure The control is 1MPa, and the reaction is kept at this temperature and pressure for about 3h. Then, the waste water (COD is 781mg / L, BOD is 781mg / L, BOD 5 280mg / L, NH 3 -N is 60 mg / L) were mixed at a mass ratio of 1:1, and after uniform mixing, the resulting mixture was allowed to stand for 1 h. Afterwards, the supernatant obtained after standing still was subjected to biochemical treatment by activated sludge method. The specific operating conditions included: temperature 35°C, sludge age 3 days, sludge load 0.3kg BOD 5 / (...

Embodiment 2

[0036] This example is used to illustrate the treatment method of the polyacrylonitrile fiber production sewage of the present invention.

[0037] The waste water (containing 0.001% by mass of polyacrylonitrile) produced in the polymerization process in the production process of polyacrylonitrile fibers is passed into the reaction tank, the pH of the material in the reaction tank is adjusted to 8, the temperature is controlled at 200 ° C, and the pressure The control is 2MPa, and the reaction is kept at this temperature and pressure for about 5h. Then, the waste water (COD is 1030mg / L, BOD is 1030mg / L, BOD 5 370mg / L, NH 3 -N is 50mg / L) mixed with a mass ratio of 1:2, and 0.05 mass parts of polyaluminum chloride (purchased from Gongyi City Fuyuan Water Purification Materials Co., Ltd.), after uniform mixing, the resulting mixture was left to stand for 0.5 h. After that, the supernatant liquid obtained after standing still is subjected to biochemical treatment by biological c...

Embodiment 3

[0042] This example is used to illustrate the treatment method of the polyacrylonitrile fiber production sewage of the present invention.

[0043] The waste water (containing 0.002% by mass of polyacrylonitrile) produced in the polymerization process in the production process of polyacrylonitrile fibers is passed into the reaction tank, the pH of the material in the reaction tank is adjusted to 10, the temperature is controlled at 190 ° C, and the pressure The control is 0.5MPa, and the reaction is kept at this temperature and pressure for about 8h. Then, the reaction product in the reaction tank is mixed with the waste water (COD is 568mg / L, BOD is 568mg / L, BOD 5 150mg / L, NH 3 -N is 34mg / L) mixed with a mass ratio of 1:5, and added 0.03 mass parts of polyaluminum sulfate (purchased from Gongyi Shengshi Water Purification Material Co., Ltd. company), after uniform mixing, the resulting mixture was left to stand for 2h. Then adopt the anaerobic biological filter method to ca...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a treatment method of polyacrylonitrile fiber production sewage. The method comprises the steps of: under the conditions of a pH value of 8-12, a pressure of 0.5-3MPa, and a temperature of 100-260DEG C, hydrolyzing the wastewater A generated in a polymerization process during polyacrylonitrile fiber production, mixing the hydrolysis product with the wastewater B generated by at least one process among other processes except the polymerization process during polyacrylonitrile fiber production, subjecting the mixture to settling separation, and then conducting biochemical treatment on the separated supernatant. The method provided in the invention can treat the polyacrylonitrile fiber production sewage till meeting the discharge standards, and can significantly reduce the consumption of an additional flocculant in the treatment process.

Description

technical field [0001] The invention relates to a method for treating sewage produced by polyacrylonitrile fibers. Background technique [0002] Polyacrylonitrile fiber (trade name: acrylic fiber) is one of the main varieties of synthetic fibers. According to statistics, the cumulative output of polyacrylonitrile fibers from January to October 2009 was 586,300 tons, accounting for 2.89% of the total output of synthetic fibers during the same period, second only to Polyester and nylon. [0003] Sewage from the production of polyacrylonitrile fibers is mainly generated from processes such as polymerization, spinning and solvent recovery. The water quality is complex, often containing low molecular polymers, high concentrations of organic nitrogen and sulfate, and a considerable number of refractory biodegradable substances. Among them, low-molecular polymers usually exist in the form of suspended colloids, which are difficult to remove by natural sedimentation. After these lo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F103/30
Inventor 李本高侯钰
Owner CHINA PETROLEUM & CHEM CORP