Composite coagulant used for treatment of wastewater of printing and dyeing industry water washing technology

Abstract

The present invention relates to the technical field of treatment of wastewater of printing and dyeing industry, and particularly relates to a composite coagulant used for treatment of wastewater of printing and dyeing industry water washing technology, the composite coagulant is characterized by being prepared from the following raw materials: PAC, PAM and water, wherein the weight ratio of PAC to PAM to water is 45-65: 0.6-1: 5 *10<5>, the PAC is poly aluminium chloride, the PAM is anionic polyacrylamide, and the molecular weight is about 8 million. The composite coagulant has the characteristics of obvious coagulation effect and low price.

Description

technical field

[0001] The invention relates to the technical field of wastewater treatment in the printing and dyeing industry, in particular to a composite coagulant used in the soaping process of the printing and dyeing industry. Background technique

[0002] In the printing and dyeing process, whether it is pad dyeing or exhaust dyeing, washing after dyeing is an indispensable step in the dyeing process of the printing and dyeing factory. And the washing process is long, usually after 6 washings, the water consumption is very large, and the proportion of washing wastewater in printing and dyeing wastewater is the largest. The color of washing wastewater is generally low, the content of organic matter is low, and the CODcr value is relatively low, which belongs to low-concentration printing and dyeing wastewater. If this part of low-concentration wastewater can be treated and reused online, the water consumption in dyeing and finishing can be greatly reduced, which is an...