Treatment method for printing and dyeing wastewater

Abstract

The invention relates to a treatment method for printing and dyeing wastewater, and belongs to the field of methods for wastewater treatment. The treatment method for printing and dyeing wastewater comprises the following steps: removing impurities from the printing and dyeing wastewater through grids, feeding the wastewater to a regulating reservoir, utilizing a pump to lift the wastewater up to enter a hydrolysis acidification pool, conducting hydrolytic acidification, discharging the acidified water to an aerobiotic pool, conducting aeration and oxidation, discharging the wastewater from the aerobiotic pool to a sand filter, after precipitation and filtration, feeding the wastewater to a chemical oxidation pool, oxidizing the wastewater and draining when the water reaches the standard. The treatment method disclosed by the invention combines multiple treatment manners to comprehensively treat the wastewater; a total removal rate of COD (Chemical Oxygen Demand) in the wastewater by the treatment method is up to 84.4%, and the chromaticity removal rate is up to 97.2%; through practical application, by the treatment method, the precipitated sludge is fully returned to the anaerobic pool, so no residual sludge is discharged; the system is stable in running, convenient to manage, and capable of achieving a good treatment effect to obtain environment benefits and social benefits.

Description

technical field [0001] The invention relates to a treatment method for printing and dyeing wastewater, which belongs to the field of wastewater treatment methods. Background technique [0002] Printing and dyeing wastewater refers to the wastewater generated during bleaching, dyeing, printing and finishing of cotton, wool, chemical fiber and other natural fibers and chemical fiber textiles. The printing and dyeing industry is a large discharge of industrial wastewater. High color, deep chroma, high alkalinity, water quality changes, etc., are difficult to treat industrial wastewater. Due to the different dyes and auxiliaries used in the printing and dyeing industry, the nature and quantity of pollutants in the printing and dyeing wastewater discharged by each factory are also very different. Therefore, there are various pollution control methods for printing and dyeing wastewater. First of all, we should start from the idea of ​​pollution control in the whole process and ado...

AI Technical Summary

Problems solved by technology

In addition, the blast aerated activated sludge method, jet aerated activated sludge method, biological turntable, etc. are also applied. The biological fluidized bed is still in the experimental application stage, but because the biological removal rate of chroma is not high, generally at 50 %, so when the water chroma is required to be high, it needs to be supplemented by physical or chemical treatment. Aerobic biological treatment has an obvious effect on BOD removal, generally up to about 80%, but the chroma and COD removal rate is not high, especially for PVA, etc. With the wide application of chemical slurry, surfactant, solvent and Pibbutine reduction technology, pure aerobic biological treatment is becoming more and more difficult, and the effluent is difficult to meet the standard

In addition, the high operating cost of the aerobic method and the treatment or disposal of excess sludge have always been a problem that has not been solved in the field of wastewater treatment.