Printing and dyeing wastewater

DATE:2017-10-16 / READ:

Printing and dyeing wastewater

Printing and dyeing wastewater refers to the waste water discharged from cotton, wool, linen, silk, chemical fiber or blended products during pretreatment, dyeing, printing and finishing. Printing and dyeing wastewater has the characteristics of large amount of water, high content of organic pollutants, deep color, high alkalinity, great change of water quality, and so on. It belongs to the industrial wastewater which is difficult to treat. There are four treatment methods for printing and dyeing wastewater, including physical treatment, chemical treatment, biological treatment and alkali decrement treatment.

Printing and dyeing wastewater with poor biodegradability, hard decoloration, decolorization of dyeing wastewater is one of the key indicators of evaluation of wastewater treatment is effective. Methods commonly used in the treatment of flocculation flocculation, and biochemical treatment method negative biochemical engineering, large area, long process, infrastructure and operating costs high, the treatment effect is not stable, due to the current staining media dominated by water, so most dyes are soluble in water, but also because of the large molecular weight dye, most dye can form hydrophilic colloid in the water, the conventional decolorization of dyeing wastewater is very difficult, therefore, need to take a more economical and efficient method for the removal and decolorization of printing and dyeing wastewater treatment technology to biochemical degradation of organic compounds.

The conventional processing method dyeing wastewater is generally divided into physicochemical and biochemical + physicochemical and biochemical treatment process of two categories, but due to the lack of hydrolysis acidification unit, the actual operation in the presence of aerobic biochemical reaction unit is not thorough enough, lead to the problem of high cost of physicochemical treatment. In the traditional aerobic biological treatment device before the increase of "hydrolysis hydrolysis acidification + aerobic tandem process, can make the organics difficult to degrade dyeing wastewater by hydrolysis, which is easy to generate bio degradable material, improve wastewater biodegradability, so as to improve the traditional process of the removal rate of COD. At present many new treatment of printing and dyeing wastewater by domestic equipment (including centralized sewage treatment and dyeing wastewater) are used by the process of "hydrolysis aerobic biological treatment process, has achieved remarkable economic and environmental benefits.

According to the above analysis, combined with the actual situation, put forward a comprehensive sewage treatment process is shown in Figure 1. Polyacrylamide produced by ATZ company can be used as flocculant for dyeing wastewater treatment, which can help sludge dewatering better.

AUTHOR:ATZ Environmental Protection Technology

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