Treatment method of printing and dying wastewater

Abstract

The invention relates to the field of industrial water treatment, in particular to a treatment method of printing and dying wastewater. The treatment method solves the problems of complex operation, high energy consumption, high sludge disposal cost, low treatment efficiency, big occupation area and the like existing in the prior art of printing and dying wastewater treatment. The invention provides the treatment method of the printing and dying wastewater, with lower operation cost, low energy consumption, stable treatment effect and small occupation area. The printing and dying wastewater is pumped into the hydrolytic acidification section of a membrane biological reaction basin after the pH value of the wastewater is regulated; a pulse water distribution mode is adopted, and thus, auxiliary equipment of a water-power impeller is not needed; mud and water separation is carried out by replacing the traditional biochemical reaction basin and sedimentation basin process with a membrane bioreactor process, and thus, drug is added for settling is not needed; activated sludge is trapped to increase microbial biomass in the biochemical basin, thereby increasing the biochemical reaction rate; the produced water of the membrane biological reaction basin is treated by adopting a nanofiltration membrane separation system, and therefore, the produced water can be discharged after reaching standards.

Description

technical field [0001] The invention relates to the field of industrial water treatment, in particular to a method for treating printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater contains a large amount of complex components such as dyes, pastes, surfactants, and alkaline substances. It has the characteristics of large chroma, high concentration of organic matter, strong alkalinity, and large changes in water quality and quantity. The wastewater discharge is intermittent and biochemical Poor sex. Existing treatment methods such as the single adsorbent in the adsorption method are difficult to effectively treat dye wastewater, and the amount of sludge generated is large, the post-treatment is difficult, easy to cause secondary pollution, and the operating cost is high; the decolorization effect of the flocculation method on the hydrophilic dye Poor, COD removal rate is low, the amount of sludge is large, and dehydration is difficult;...

AI Technical Summary

Problems solved by technology

[0002] Printing and dyeing wastewater contains a large amount of complex components such as dyes, pastes, surfactants, and alkaline substances. It has the characteristics of large chroma, high concentration of organic matter, strong alkalinity, and large changes in water quality and quantity. The wastewater discharge is intermittent and biochemical poor sex

Existing treatment methods such as the single adsorbent in the adsorption method are difficult to effectively treat dye wastewater, and the amount of sludge generated is large, the post-treatment is difficult, easy to cause secondary pollution, and the operating cost is high; the decolorization effect of the flocculation method on the hydrophilic dye Poor, COD removal rate is low, the amount of sludge is large, and dehydration is difficult; the electrolysis method has problems such as large consumption of electrode materials, easy passivation of the electrode plate, high energy consumption, and relatively high operating costs; the chemical oxidation method has high treatment costs, Not suitable for the treatment of large flow wastewater

[0003] How to solve the problems of high treatment cost, complicated operation and poor treatment effect are the problems to be solved in the treatment of printing and dyeing wastewater

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