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Combination technology for processing difficultly-degraded dye waste water

A combination process and dye wastewater technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve complete decolorization and deodorization treatment, simple operation, and low price

Inactive Publication Date: 2015-07-01
JIANGNAN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the difficulties encountered in the process of refractory dye wastewater treatment, and to provide a combined treatment process to realize the complete decolorization and deodorization treatment of dye wastewater with complex composition and high concentration
Firstly, the physical flocculation method is used for pretreatment

Method used

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  • Combination technology for processing difficultly-degraded dye waste water

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with specific examples.

[0017] Wastewater from a dye factory contained about ten different types of dyes, including metal complex dyes. The color of the wastewater is dark brown red, exudes a foul smell, the COD is about 5000, and the chromaticity is about 3200. Using a single method such as micro-electrolysis, Fenton method, and catalytic degradation method has little effect on decolorization and deodorization. The waste water is treated by a combined process as shown in the accompanying drawing.

[0018] Firstly, add inorganic salts such as ammonium oxalate into the wastewater, stir and let it stand, a large amount of precipitation will be produced, and the color of the wastewater will become significantly lighter, from opaque dark brown red to transparent light brown, and the chromaticity will drop by 30-40%.

[0019] Add an iron-carbon mixture (the mass ratio of the two is 2:1) to the light bro...

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Abstract

The dye waste water has the characteristics of high concentration, deep chroma, complex organic matter component, high inorganic salt content, high toxicity and poor biodegradability, which is one of the difficult processing waste water at home and abroad. For the dye waste water containing the difficultly-degraded metal complexation dye, a single Fenton method or an iron-carbon micro-electrolysis technology can not realize complete decolouring, According to the invention, a preflocculation-microelectrolysis-Fenton-postflocculation-adsorption combination technology is employed for degrading the dye waste water, complete decolouring and deodorization treatment of the difficultly-degraded dye waste water can be realized, and COD is decreased by more than 90%.

Description

technical field [0001] The invention relates to the fields of inorganic synthetic chemistry, dye wastewater treatment and the like. Background technique [0002] The textile industry is one of the traditional pillar industries in my country, among which the printing and dyeing industry accounts for a large proportion in the textile industry. In the past ten years, the textile industry has developed rapidly, and textile printing and dyeing factories have spread all over the vast urban and rural areas of my country. The development of the printing and dyeing industry has also caused serious water pollution. The wastewater is a typical organic industrial wastewater with high pollution load and high chroma, and its components are complex. Most of these sewage are directly discharged without treatment, which is one of the most important sources of water pollution. [0003] Dye wastewater has the characteristics of high concentration, deep color, complex organic components, high...

Claims

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Application Information

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IPC IPC(8): C02F9/06
Inventor 刘瑛陈新商少明
Owner JIANGNAN UNIV
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