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Method for treating wastewater in textile printing and dyeing industry

A technology for industrial wastewater and treatment methods, which is applied in the fields of textile industrial wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of large fluctuations in water quality, poor biodegradability, and toxic and harmful substances in wastewater, etc. problems, to achieve the effects of CODcr reduction, biodegradability improvement, and impact load reduction

Inactive Publication Date: 2009-09-23
YINHE SCI & TECH QINGDAO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

③Water quality fluctuates greatly
⑤ Difficult to handle and poor biodegradability
⑥ Some wastewater contains toxic and harmful substances
The existing textile printing and dyeing wastewater treatment technology is relatively simple, and the cotton spinning industrial wastewater generally does not meet the discharge standard after biological treatment, and it cannot effectively connect different types of chemical treatment devices in series after the biological treatment device for further treatment.

Method used

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  • Method for treating wastewater in textile printing and dyeing industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In an industrial area of ​​a certain city, the wastewater from several textile printing and dyeing factories was collected for treatment. The two factories mainly process pure cotton, with an output of several million meters, without alkali recovery. The main dyes are reactive dyes, shihlin dyes, paints and a small amount of sulfur dyes. The treated water volume is 25000m 3 / day, the water quality of mixed wastewater from these two plants is shown in Table 1.

[0032] Table 1 Water quality indicators of mixed wastewater

[0033] project

Range of water quality change

average

COD Cr (mg / L)

236.67～4037.62

2500

BOD 5 (mg / L)

105.78～2050.56

650

SS(mg / L)

59～5944

600

Chroma (times)

27.78～5000

1000

pH value

12.0～14.0

13.0

[0034] Such as figure 1 Shown, the present invention adopts following steps:

[0035] A. Pretreatment of high chroma dyeing stock s...

Embodiment 2

[0045] During the homogenization treatment, the volume ratio between the product of step A, other waste water and waste liquid and the externally introduced organic waste water is 2:1:0.05, and other process conditions are the same as in Example 1. The water quality of the effluent after treatment complies with the Class I standard in Table 3 of GB4287-92 "Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry".

Embodiment 3

[0047] During the homogenization treatment, the volume ratio between the product of step A, other waste water and waste liquid and the externally introduced organic waste water is 5:1:0.01, and other process conditions are the same as in Example 1. The water quality of the effluent after treatment complies with the Class I standard in Table 3 of GB4287-92 "Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry".

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Abstract

The invention discloses a method for treating the wastewater in textile printing and dyeing industry. The treatment method comprises the following steps of: A. implementing pretreatment to high-chroma dye stock solution, injecting the high-chroma dye stock solution into a color reaction tank, then adding flocculant FeCl3 and adding 200-400mg / L high-chroma dye stock solution with the residence time of 5-7h; B. homogenization treatment: adding the product in step A, other waste water and waste liquid, and externally-introduced organic wastewater into a regulation pool with the residence time of 7-9h; C. biochemical treatment: leading the effluent of the regulation pool to enter a hydrolytic acidification pool, an aerobic tank and a sedimentation tank in sequence, with the residence time of 45-50h for the wastewater at the stage; and D. post-flocculation treatment: adding flocculant FeSO4 into the effluent in the step C and then implementing post-flocculation treatment. After the treatment of the method, the effluent quality conforms to the I-class standard in Table 3 of GB4287-92 Discharge Standards for the Textile Dyeing and Finishing Industrial Water Pollutant.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular, the invention relates to a treatment method for textile printing and dyeing industrial wastewater. Background technique [0002] At present, industrial wastewater is one of the main pollution sources of the environment. Wastewater from the textile printing and dyeing industry is organic wastewater with complex components mainly composed of organic pollution. The four processes of textile printing and dyeing process will discharge wastewater. The pretreatment stage (including singeing, desizing, scouring, bleaching, mercerizing and other processes) will discharge desizing wastewater, scouring wastewater, bleaching wastewater and mercerizing wastewater, and the dyeing process will discharge dyeing wastewater. Waste water, the printing process discharges printing waste water and soap liquid waste water, and the finishing process discharges finishing waste wate...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52C02F3/30C02F103/30
Inventor 亓久平荆汉江宋述瑞
Owner YINHE SCI & TECH QINGDAO
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