Recycling treatment method of dye wastewater

Abstract

The invention discloses a recycling treatment method of dye wastewater and belongs to the technical field of wastewater treatment. The method includes the steps of firstly, filtering; secondly, performing primary adsorption; thirdly, neutralizing; fourthly, performing secondary adsorption; fifthly, performing low-temperature catalytic oxidization; sixthly, performing concentration and evaporation;sixthly, performing biochemical treatment. The recycling treatment method has the advantages that residual dye in the wastewater and catalysts and salt in the wastewater can be recycled, wastewater recycling is achieved, a good wastewater treatment effect is achieved, and stable up-to-standard emission is achieved; meanwhile, the biochemical performance of the wastewater can be increased greatly,the stable operation of a follow-up biochemical system is guaranteed, and solid waste and secondary environment pollution are avoided completely.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for recycling dye wastewater. Background technique [0002] Dye wastewater is wastewater discharged from cotton, hemp, chemical fiber and its blended products, silk-based printing and dyeing, wool dyeing and finishing, and silk factories. The treatment of dye wastewater with dispersibility, acidity and cations is currently The common methods are: acid analysis, iron-carbon micro-electrolysis, Fenton oxidation, coagulation precipitation, concentrated evaporation and biochemical treatment, etc. The treatment effect is not good, and a large amount of hazardous waste will be generated at the same time, causing secondary pollution and high operating costs. Moreover, the quality of the effluent is unstable and often fails to meet the discharge standards. [0003] In order to cope with the deficiencies of the existing technology, the Chinese invention patent with ...

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Problems solved by technology

[0002] Dye wastewater is wastewater discharged from cotton, hemp, chemical fiber and its blended products, silk-based printing and dyeing, wool dyeing and finishing, and silk factories. The treatment of dye wastewater with dispersibility, acidity and cations is currently The common methods are: acid analysis, iron-carbon micro-electrolysis, Fenton oxidation, coagulation precipitation, concentrated evaporation and biochemical treatment, etc. The treatment effect is not good, and a large amount of hazardous waste will be generated at the same time, causing secondary pollution and high operating costs. Moreover, the quality of the effluent is unstable and often fails to meet the discharge standards

[0003] In order to cope with the deficiencies of the existing technology, the Chinese invention patent with the application number of 201010538819.5 discloses a resource recovery treatment method of acid dye wastewater, which adopts the process of filtration-stirring-oxidation-adsorption to treat the acid dye wastewater, so that the water The decolorization rate of the sample reaches 25-60%, and the total organic carbon removal rate is 30-85%. After the treated wastewater is reused as a reaction solvent in the dye production process, qualified products are obtained. This process will produce hazardous waste in the oxidation stage. , and the adsorbent is cinder, activated carbon, ion exchange resin or fine sand, which cannot be regenerated or the regeneration effect is not good after adsorption, which will cause environmental pollution

[0004] The Chinese invention patent with application number 201410031902.1 discloses a treatment method for acid dye mother liquor wastewater, which adopts the process of acidification-microelectrolysis-flocculation-condensation crystallization-separation to treat acid dye mother liquor wastewater, which reduces the treatment cost of wastewater. It is an environmentally friendly and economical treatment method, which will produce a large amount of iron sludge hazardous waste in the micro-electrolysis and flocculation steps, which will endanger the environment

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