Printing and dyeing wastewater treatment process without sludge

Abstract

The invention discloses a printing and dyeing wastewater treatment process without sludge. The process comprises the following steps: feeding printing and dyeing wastewater into grids for filtration; regulating a PH value of the printing and dyeing wastewater with a regulating pool; decoloring the printing and dyeing wastewater in a decoloring pool and performing a flocculation reaction; electrolyzing the printing and dyeing wastewater by using a high-frequency pulse generator; performing hydrolysis and acidification reactions on activated sludge and the printing and dyeing wastewater; discharging the printing and dyeing wastewater into an aerobic pool and metabolizing with oxygen; feeding the printing and dyeing wastewater into a precipitation pool; completely feeding the generated sludge back into an anaerobic hydrolysis acidification pool; filtering the sludge in a sand filtering pool and then flowing into an oxidation pool. The treatment process is simple, compact in procedures as well as simple and convenient to operate. After the printing and dyeing wastewater is precipitated one time, the removal rate of COD can reach above 70%, and the removal rate of BOD can reach about 40%, so that the treated water is high in quality and can meet the requirement of recycling water for production. If the water is deeply treated further, the water can be recycled without sludge discharging. In addition, the excessive increasing of the sludge in an anaerobic biochemical pool is not found. The treatment process does not require multiple precipitations and is less in procedures, thereby greatly saving the cost and improving the efficiency.

Description

Technical field [0001] The invention belongs to the technical field of sewage treatment, and specifically relates to a sludge-free printing and dyeing wastewater treatment process. Background technique [0002] With the continuous progress of society, people have higher and higher requirements for environmental protection. Among them, the requirements for wastewater treatment and discharge are becoming more and more stringent. Printing and dyeing wastewater is the wastewater discharged from printing and dyeing factories that process cotton, linen, chemical fiber and their blended products. It discharges a large amount of waste water, each printing and dyeing processing 1 ton of textiles consumes 100-200 tons of water, of which 80%-90% becomes waste water. There are many pollutants and varieties. The waste water of printing and dyeing enterprises is generally composed of desizing wastewater and smelting Waste water, bleaching wastewater, mercerizing wastewater, dyeing wastewat...

AI Technical Summary

Problems solved by technology

[0002] With the continuous progress of society, people's requirements for environmental protection are getting higher and higher, and the requirements for wastewater treatment and discharge are becoming more and more stringent. Printing and dyeing wastewater is the wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, chemical fibers and their blended products. The amount of wastewater discharged is relatively large. Each ton of textile printing and dyeing consumes 100-200 tons of water, of which 80%-90% becomes wastewater. The number of pollutants is large and the varieties are miscellaneous. Wastewater, bleaching wastewater, mercerizing wastewater, dyeing wastewater, printing wastewater, and finishing process wastewater are mixed. The discharged wastewater contains not only the entrainment of the fiber raw material itself, but also the slurry, oil, dyes and chemicals used in the processing process. Auxiliaries, etc., lead to large changes in COD, high pH, ​​large chroma, high organic content, and large changes in water temperature and volume, which affects the treatment effect of wastewater and seriously pollutes the environment. Many, high cost, and there is still sludge after treatment, so a special sludge treatment device needs to be installed, which increases the cost