A printing and dyeing wastewater treatment method for cationic dyes

Abstract

The invention discloses a wastewater treatment method for cationic dyes. Printing and dyeing wastewater is treated through three steps of early detection, static adsorption, and foam separation and decolorization, especially for the printing and dyeing wastewater containing the cationic dyes. Pigment components and the molar concentration of the cationic dyes contained in the printing and dyeing wastewater are determined by the early detection, which is convenient for determining the amount of an anionic surfactant used in the subsequent foam separation and decolorization step, and ensuring the decolorization effect; a adsorbent made from volcanic rock powder, cottonseed hull, dialdehyde starch is used to adsorb the printing and dyeing wastewater statically, so that most of the pollution components in the printing and dyeing wastewater can be adsorbed and removed, and the decolorization effect of the foam separation and decolorization step is ensured; according to the invention, a mixture of fatty alcohol ether phosphate ester and triethanolamine-lauryl sulfate in a specific ratio is used as the anionic surfactant; and the good decolorization effect can be achieved after the staticadsorption treatment and one foam separation and decolorization step.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a printing and dyeing wastewater treatment method for cationic dyes. The invention belongs to the technical field of waste water treatment. Background technique [0002] The printing and dyeing industry is a large discharge of industrial wastewater. The dye printing and dyeing wastewater discharged by it has a large amount of water, high concentration of organic pollutants, deep color, poor biochemical properties, large changes in water quality, and complex components. Therefore, printing and dyeing wastewater is a difficult industrial wastewater to treat. one. [0003] In the field of environmental engineering, dye molecules are often divided into the following three categories according to the ionic state dissociated in aqueous solution: [0004] 1. Cationic dyes, such as basic dyes; [0005] 2. Anionic dyes, such as direct dyes, acid dyes, etc.; [0006] 3. Non-ionic dyes, ...

AI Technical Summary

Problems solved by technology

The traditional adsorbent is activated carbon, which has strong adsorption capacity and high removal rate, but the regeneration efficiency of activated carbon is low, the water quality of the treated water is difficult to meet the reuse requirements, the cost is high, and the application is limited

[0008] Patent CN101381173B discloses the application of foam separation technology to the treatment of anionic dye printing and dyeing wastewater, but the foam separation and decolorization process has undergone 4 times of decolorization, and the steps are cumbersome, which increases the treatment cost

In addition, the main advantage of the foam separation method is that it is suitable for the separation and recovery of low-concentration substances. In addition to low-concentration cationic dyes, printing and dyeing wastewater also contains a large number of other pollutants with medium concentrations. The direct use of foam separation methods is often not ideal. The effect of wastewater treatment will also affect the decolorization effect of the foam separation step

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