Textile printing and dyeing wastewater advanced treatment method

Abstract

The present invention discloses an advanced treatment method of printing and dyeing textile wastewater belonging to treatment method of printing and dyeing wastewater. The treatment method aims at the tail water of the low concentration printing and dyeing wastewater of the traditional after treated. The tail water is conducted into an electrocatalysis reaction device. The voltage to control the device is between 30 volt-amperes to 80 volt-amperes and the current to control the device is between 15 amperes to 50 amperes. The decomposing of persistent organic matters and removing of chroma are accomplished in the electrocatalysis reaction device. The water quality of the tail water after treated is better than primary standard of Discharge Standard of Water Pollutants for Dyeing and Finishing of Textile Industry (GB4287-92) and can reach drainage standard. The tail water after treated can also be applied as production technics water.

Description

Technical field: [0001] The invention relates to a method for advanced treatment or reuse of textile printing and dyeing wastewater, which is suitable for advanced treatment or reuse of printing and dyeing tail water after biochemical-physicochemical treatment. Background technique: [0002] The printing and dyeing industry is one of the major water users. The wastewater discharged during the production process has a high content and high chroma, which is seriously harmful to the receiving water body. In recent years, Jiangsu, Guangdong and other provinces have promulgated local discharge standards for printing and dyeing wastewater, which are stricter than the original national standards. Due to the limitation of environmental capacity in some areas, the allowable discharge concentration of printing and dyeing wastewater is even lower. For example, the Zhangjiagang area of ​​Jiangsu Province requires that the COD concentration of the printing and dyeing wastewater effluent...

AI Technical Summary

Problems solved by technology

[0004] The water quality of printing and dyeing wastewater is complex, especially the tail water after biochemical-physicochemical treatment has poor biodegradability and low concentration of suspended solids. The wastewater is mainly composed of difficult biodegradable substances

The use of traditional physicochemical or biochemical treatment processes has little effect on the reduction of tail water COD

However, commonly used advanced oxidation technologies such as ozone oxidation have high chemical costs and high operating costs.

Adsorption techniques such as resin adsorption or activated carbon adsorption are difficult to regenerate the adsorbent

Therefore, most of the existing printing and dyeing wastewater advanced treatment technologies have poor technical and economic feasibility, are difficult to promote, and cannot meet the needs of pollution prevention and control in key areas (such as the Taihu Lake area)

Images