Technology for treating printing and dyeing wastewater

Abstract

The invention discloses a technology for treating printing and dyeing wastewater and relates to the technical field of wastewater treatment. The technology for treating printing and dyeing wastewatercomprises the following steps: S1) discharging printing and dyeing wastewater into a regulating reservoir and regulating the flux of wastewater; S2) introducing the wastewater in the regulating reservoir into a settling basin, adding a settling agent into the settling basin and then settling; S3) filtering the wastewater after settling treatment in the settling basin; S4) guiding the filtered wastewater into a decolorizing tank for decolorizing, wherein a decolorizing agent added while decolorizing comprises the following raw materials in parts by weight: 60-80 parts of activated sludge, 20-30parts of kieselguhr, 10-15 parts of ferrate, 10-13 parts of ferric chloride and 20-30 parts of natural bentonite; S5) adding an adsorbent into the decolorized wastewater for absorbing catalysis; S6)performing ultrafiltration treatment on the absorbed wastewater. Wastewater can reach emission standards through the six steps. The technology disclosed by the invention has the effect of one-step simultaneously removing hydrophilic and hydrophobic dyes from wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater refers to the wastewater discharged during the pretreatment, dyeing, printing and finishing processes of cotton, wool, chemical fiber and other textile products. One of the notable features of printing and dyeing wastewater is its relatively high chroma. [0003] In the existing wastewater treatment technology, after biochemical treatment, although with the reduction of BOD and the removal of some suspended solids, the chroma is also reduced, but the effluent still has a darker color, which is very important for discharge or production reuse. Adverse. Commonly used methods for decolorization include chemical coagulation, chemical oxidation, activated carbon adsorption, reverse (osmosis) osmosis, etc., but these methods have the following defects: some...

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Problems solved by technology

[0003] In the existing wastewater treatment technology, after biochemical treatment, although with the reduction of BOD and the removal of some suspended solids, the chroma is also reduced, but the effluent still has a darker color, which is very important for discharge or production reuse. Adverse

Commonly used methods for decolorization include chemical coagulation, chemical oxidation, activated carbon adsorption, reverse (osmosis) osmosis, etc., but these methods have the following defects: some methods are only suitable for the dehydration of hydrophilic dye wastewater, while others It is only suitable for the decolorization of hydrophobic dye wastewater. In common printing and dyeing wastewater, it generally contains both hydrophilic and hydrophobic dyes. Using a decolorization method alone often cannot obtain a satisfactory decolorization effect. If you use decolorization Completely combined treatment system, decolorization costs will be accompanied by increased

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