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Method for treating dyeing waste water of disperse reactive dyes

A technology for printing and dyeing wastewater and its treatment method, which is applied in the textile industry wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor deodorization effect, unsatisfactory effect, secondary pollution, etc. , to achieve excellent results, avoid secondary pollution, clean energy and environmental protection

Inactive Publication Date: 2013-03-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of printing and dyeing wastewater with flocculants is still effective for the precipitation of suspended solids, but the effect of reducing COD, BOD and chroma is not ideal, especially the deodorization effect is even worse, and it will also cause secondary pollution, which cannot be fundamentally solve the pollution problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Use dilute hydrochloric acid to adjust the pH to 8.5, add 100mg / L decolorization coagulant for decolorization and flocculation treatment, including 40mg / L polyaluminum chloride, 20mg / L polyacrylamide and 40mg / L magnesium sulfate; after precipitation, the effluent is introduced The air flotation device makes the tiny colloidal particles in the wastewater float to the water surface; then use acid to adjust the pH value of the wastewater to 3.0, and add 2ppm of ferrous ions and 5ppm of H 2 o 2 , flowed through the asbestos net coated with nano-scale titanium dioxide, and irradiated with ultraviolet light for 30 minutes; the pH value of the effluent was adjusted to 6.5 with alkali, and the removal rate of COD, BOD and chroma of wastewater reached 98%, which met the industry discharge standard.

example 2

[0021] Use dilute hydrochloric acid to adjust the pH to 9.0, add 200mg / L decolorization coagulant for decolorization and flocculation treatment, including 35mg / L polyaluminum chloride, 15mg / L polyacrylamide and 50mg / L magnesium sulfate; after precipitation, the effluent is introduced The air flotation device makes the tiny colloidal particles in the wastewater float to the water surface; then use acid to adjust the pH value of the wastewater to 3.5, and add 3ppm of ferrous ions and 8ppm of H 2 o 2 , flowed through the asbestos net coated with nano-scale titanium dioxide, and irradiated with ultraviolet light for 45 minutes; the pH value of the effluent was adjusted to 7.0 with alkali, and the removal rate of COD, BOD and chroma of wastewater reached 99%, which met the industry discharge standard.

example 3

[0023] Use dilute hydrochloric acid to adjust the pH to 9.5, add 300mg / L decolorizing coagulant for decolorization and flocculation treatment, including 30mg / L polyaluminum chloride, 10mg / L polyacrylamide and 60mg / L magnesium sulfate; after precipitation, the effluent is introduced The air flotation device makes the tiny colloidal particles in the wastewater float to the water surface; then use acid to adjust the pH value of the wastewater to 4.0, and add 5ppm of ferrous ions and 10ppm of H 2 o 2 , flowed through the asbestos net coated with nano-scale titanium dioxide, and irradiated with ultraviolet light for 60 minutes; the pH value of the effluent was adjusted to 7.5 with alkali, and the removal rate of COD, BOD and chroma of wastewater reached 99.8%, which met the industry discharge standard.

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PUM

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Abstract

The invention discloses a method for treating dyeing waste water of disperse reactive dyes, which comprises the following steps: regulating the pH value, adding decolorizing coagulant, precipitating, and then introducing into an air floatation device; regulating the pH value, adding ferrous ions and H2O2, flowing through an asbestos gauge coated with nano level titanium dioxide, and performing ultraviolet irradiation; and finally, regulating the pH value of effluent water, thus achieving the purpose of discharging dyeing waste water meeting standards. According to the invention, a photocatalytic technology is introduced, thereby effectively avoiding secondary pollution and achieving the effects of energy saving and environment friendliness; and the used decolorizing coagulant is a mixture comprising 40-80% of polyaluminum chloride, 5-10% of polyacrylamide and 20-40% of magnesium sulfate in percentage by mass. Through using the method provided by the invention to treat dyed waste water, the COD (chemical oxygen demand), BOD (biochemical oxygen demand) and chroma removal rate of dyeing waste water can be up to 98% or above.

Description

technical field [0001] The invention discloses a printing and dyeing wastewater treatment technology, in particular to a printing and dyeing wastewater treatment method for disperse reactive dyes. Background technique [0002] Printing and dyeing wastewater has complex components, dark color, and large discharge volume. It has always been one of the most difficult industrial wastewater at home and abroad. People spend a lot of material and financial resources to solve this difficult problem for this reason. The current treatment methods for printing and dyeing sewage mainly include biochemical methods, electrolysis methods, and photocatalytic methods. The biochemical method occupies a large area, has a narrow scope of application, and the effect is not ideal; although the electrolysis method is better than the biochemical method, it consumes a lot of energy and is difficult to popularize. Photocatalysis has attracted much attention because it can completely mineralize orga...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F103/30
Inventor 徐炜
Owner CHANGZHOU UNIV
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