Process for treating and recycling printing and dyeing wastewater by virtue of electro-coagulation

Abstract

The invention relates to the technical field of sewage treatment, and in particular relates to a process for treating and recycling printing and dyeing wastewater by virtue of electro-coagulation. According to the process, an electromechanical technology is merged with a conventional chemical precipitation technology, the deep removal of ions is realized under the action of a direct-current electric field, a polar plate is used for continuously reacting with current, electron transfer is generated between a cathode and anode of an electrolytic bed to induce an electrochemical reaction, and meanwhile water is subjected to oxygen discharge at the anode to generate an oxidization reaction so as to oxidize inorganic and organic substances in the water, and cathode ions are electrified to form nascent hydrogen which has the strongest reducing power. Therefore, dissolved salts, colloids, microorganisms and organic substances in the water can be effectively removed, coagulating sedimentation between iron ions and metal ions in the water is generated, an additional chemical is not needed, and a flocculant is produced.

Description

Technical field: [0001] The invention relates to the technical field of sewage treatment, in particular to electrocoagulation in the treatment and recycling of printing and dyeing wastewater. Background technique: [0002] Printing and dyeing wastewater is wastewater produced by textile printing and dyeing factories in the production and processing of cotton, linen, chemical fibers and blended products. The main characteristics of printing and dyeing wastewater are large water volume, high chroma, high CODCr, strong alkalinity and large changes in water quality. 100-200 tons of water is needed for printing and dyeing 1 ton of textiles, of which 80% to 90% become waste water. Wastewater contains dyes, pulp, chemical additives, oils, acids and bases, fibers and entrained impurities, inorganic salts and minerals, etc. Belongs to difficult to treat industrial wastewater. In addition, the printing and dyeing industry is a large discharge of industrial wastewater (accounting fo...

AI Technical Summary

Problems solved by technology

However, the traditional treatment process cannot grasp the characteristics of printing and dyeing wastewater well to make a breakthrough

The traditional process still has many limitations in the treatment of printing and dyeing wastewater: 1. The process is cumbersome and occupies a large area; 2. The treatment effect is single, and there is no systematic and comprehensive treatment; Biochemical treatment brings instability and processing pressure; 4. The debugging cycle is long; 5. Relying on human operation, it is prone to hidden dangers such as operational errors leading to system failure; Elevated salinity will increase the load on the recycling system, make the system clean frequently, fail to meet the recycling requirements normally, and cause high operating costs, etc.