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Color fiber alkali decremental waste water treating and recovering process

A technology of alkali reduction and fiber alkali, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of not removing organic and inorganic ions, recovering the purity of terephthalic acid low, the difficulty of recycling and other issues, to achieve good economic and environmental benefits, control pollution, improve the effect of the environment

Inactive Publication Date: 2007-03-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above documents deal with the alkali reduction wastewater of ordinary white blank chemical fiber fabrics, while the dyes of colored chemical fiber fabrics are directly mixed in polyester masterbatch, and are used for spinning after being made into color masterbatch. Reduction waste water is different, colored fiber fabric alkali reduction waste water is colored, the purity of recovered terephthalic acid is low, and there are many impurities, so the difficulty of waste water treatment and terephthalic acid recovery and utilization is further increased
At the same time, at present, no research on the reuse of alkali reduction wastewater has been carried out at home and abroad, mainly because there is no suitable good method for removing organic and inorganic ions

Method used

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  • Color fiber alkali decremental waste water treating and recovering process
  • Color fiber alkali decremental waste water treating and recovering process
  • Color fiber alkali decremental waste water treating and recovering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 20 times diluted polyacrylamide derivative flocculation and decolorization agent to the alkali reduction concentrated wastewater with a concentration of terephthalic acid greater than 0.5g / L. The amount of flocculant added is 3ml / L wastewater, stir evenly, stand still, and filter Remove chroma, particles (fibers) and colloidal substances in wastewater.

[0031] Add polyacrylamide derivative flocculation and decolorization agent diluted 20 times to the alkali reduction dilute wastewater with terephthalic acid concentration lower than 0.5g / L, the amount of flocculant added is 3ml / L wastewater, stir evenly, let stand, Filter to remove chroma, particles (fibers) and colloidal substances in wastewater. The dilute wastewater after decolorization is treated with integrated membrane filtration and concentration treatment with nanofiltration flat membrane. After membrane filtration and concentration, concentrate and permeate are obtained. The permeate is separated and treate...

Embodiment 2

[0034] Use the polyacrylamide derivative flocculation decolorant to study the influence of usage amount on the water quality of alkali reduction wastewater (6 minutes), the effect is shown in Table 1: with the increase of polyacrylamide derivative flocculation decolorant dosage, the chromaticity and a gradual decrease in turbidity. And when the amount of flocculating decolorizing agent reaches a certain value, the change of the two is no longer obvious. Considering the treatment cost, the selected dosage is 3.429ml / L waste water. In addition, the content of terephthalic acid (TA) in wastewater is hardly affected by organic polymer flocculation decolorizers.

[0035] Table 1 Selection of the amount of flocculation decolorizer

[0036] Amount of flocculation decolorizer

(ml / L waste water)

Chroma (times)

Turbidity (degrees)

TA concentration

(mg / mL)

1.714

2.057

2.400

10.0

7.0

3.0

12...

Embodiment 3

[0043] Select the following three organic polymer decolorizers respectively:

[0044] 1# Polyacrylamide Derivatives

[0045] 2# Dicyandiamide series cationic polymer compound

[0046] 3# Quaternary ammonium cationic polymer compound

[0047] Through the experiments in Table 2, 3 different organic polymer flocculation decolorizers were compared for wastewater pretreatment. The actual dosage of the 3 kinds was controlled according to the treatment cost (about 1.2 yuan / ton). From the results, it can be seen that the flocculation of 3# The decolorization effect is 1.7, 2.1 times (turbidity) and 1.4, 1.5 times (chroma) of 1# and 2# respectively, and it has less influence on TA. Therefore, it is more reasonable to choose 3# quaternary ammonium cationic polymer compound as decolorizing agent.

[0048] Table 2 Selection comparison of decolorizing agent

[0049]

Types of decolorizers

Chroma (times)

Turbidity (degrees)

TA co...

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Abstract

The invention discloses a process of recovering terephatalic acid from colored alkali reduction waste water, processing two waste water streams thick and thin coming from alkali reduction process by qualities, firstly decolorizing by decolorizing agent, then integrating acid precipitation with diaphragm process to recover erephatalic acid from the waste water, thus making CODcr of waste water reduced by 50-70% for the convenience of follow-up biochemcial and physical chemcial treaments, where the purity of the recovered terephatalic acid is up to above 90%, able to act as chemcial raw material for preparing dimethyl terephthalate, and dioctyl terephthalate. And it can be applied to chemcial production, controlling pollution, improving environment, saving energy sources, reducing cost, and obtaining good economic and environmental benefits.

Description

technical field [0001] The invention relates to a wastewater treatment and recovery process, in particular to a treatment and recovery process of colored chemical fiber alkali weight reduction wastewater. Background technique [0002] Alkali weight-reduction (Alkali weight-reduction) is the pretreatment process of textile printing and dyeing enterprises on the fabric (polyethylene terephthalate PET) with lye at high temperature to hydrolyze and corrode the polyester macromolecular ester bonds, so as to promote the fibrous structure. It is a new technology to relax and reduce the weight of the fabric, so that the fabric has a real silk feel. The wastewater produced by the alkali reduction process contains polyester decomposition products, swelling agents, accelerators, surfactants, etc., and the main components are terephthalic acid (in the form of sodium salt), ethylene glycol, polyester oligomers and A small amount of various additives (such as N,N-polyoxyethylene alkylami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/00C02F1/56C02F1/44C02F1/58C02F1/66C07C63/26
Inventor 陈欢林范立海张林王树源杨岳平
Owner ZHEJIANG UNIV
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