Printing and dyeing waste water treatment method based on film technology

Abstract

The invention discloses a disposing method of textile printing waste water based on film technology involving a waste water disposing method, which comprises the following steps: adjusting pH and COD value of integrated waste water; pumping into flocculate tank; adding into flocculant; pumping into flocculating setting vessel; getting clarified solution; pumping into membrane biological reactor; proceeding biological treatment; getting dialysate; pumping into counter osmotic separating system; proceeding counter osmotic separation; getting reverse osmosis dialysate; recycling; making concentrated liquid flow into oxide adsorbing tank; refluxing into flocculating setting disposal process; proceeding twice flocculating setting dispose; reaching to two grade emission standard; discharging the eligible reverse osmosis dialysate; adding ClO2 to oxide ineligible reverse osmosis dialysate; adsorbing with activated char; adjusting pH value with alkali liquor; depositing in storing tank.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating printing and dyeing wastewater based on membrane technology for reuse of reclaimed water. Background technique [0002] The textile industry is a traditional pillar industry in my country, usually including five parts: textile, printing and dyeing, chemical fiber, clothing and textile special equipment manufacturing. With the rapid development of the national economy, my country's printing and dyeing industry has also entered a period of rapid development. The level of equipment and technology has been significantly improved, and the production process and equipment have been continuously updated. Printing and dyeing enterprises, especially private printing and dyeing enterprises, have developed very rapidly. Printing and dyeing process refers to the general term for the physical and chemical treatment of various textile materials (fibers, yarns, fabrics) ...

AI Technical Summary

Problems solved by technology

The second is that printing and dyeing as environmental pollutants have many types and complex structures

The third is that most printing and dyeing are toxic and refractory organic substances, which have strong chemical stability and have the "three causes" of carcinogenic, teratogenic and mutagenic

Although electrolysis and oxidation have certain effects in removing the chroma of printing and dyeing wastewater, COD removal is often not ideal, and the cost of treatment chemicals is relatively high. Many new oxidation methods are still in the experimental research stage and have not been industrialized.

[0014] In terms of biochemistry, printing and dyeing is a typical fine chemical product with the characteristics of small batches and multiple varieties. Its structure is complex and the production process is long. From raw materials to finished products, it is often accompanied by nitrification, condensation, reduction, oxidation, diazotization, coupling, etc. Unit operation, many by-products, low product yield, complex organic components in wastewater, chemical reaction process and separation, refining, washing and other processes in printing and dyeing production are all using water as a solvent, and the water consumption is large

Although the biochemical treatment of printing and dyeing wastewater has the advantages of less investment, there are still disadvantages such as microorganisms are difficult to adapt to printing and dyeing wastewater, the water quality fluctuates greatly, and the toxicity is large, and there are problems such as sludge disposal, biogas treatment in the anaerobic section, and complex management.

Printing and dyeing wastewater treatment using a single treatment method is often difficult to achieve the desired effect

The conventional method is to combine various treatment methods, which has defects such as long process flow, high operating cost, and unstable effluent quality.

Images