Washing bleaching and dyeing wastewater treatment method

Abstract

The invention relates to a washing bleaching and dyeing wastewater treatment method. The washing bleaching and dyeing wastewater treatment method comprises the following processing steps of: (1) wastewater pretreatment; (2) physico-chemical precipitation treatment; (3) biological selection treatment; (4) aeration treatment in an improved oxidation ditch; and (5) natural sedimentation treatment. Aiming at the characteristic of large water consumption in washing bleaching and dyeing industries, a physical chemistry technology and a biological technology are used for treating washing bleaching and dyeing wastewater according to the washing bleaching and dyeing wastewater treatment method, and therefore, the washing bleaching and dyeing wastewater treatment method realizes the production recycling of most water while leading the treated wastewater to reach the Discharge Standard of Water Pollutant for Dyeing and Finishing of Textile Industry GB 4287-92. By adopting the washing bleaching and dyeing wastewater treatment method, the discharged wastewater is reduced, resources are saved and environments are protected; and simultaneously, the washing bleaching and dyeing wastewater treatment method has the characteristics of low investment cost, low energy consumption, high treatment efficiency, great capacity of resisting load impact, low sludge yield and high recycling ratio of reclaimed water.

Description

technical field [0001] The invention relates to a method for treating washing, bleaching and dyeing sewage. Background technique [0002] At present, tens of thousands of dyes are used in the world. The bleaching and dyeing wastewater mainly contains dyes, sizing agents, oil agents, acids and bases, fiber impurities, and inorganic salts, etc. It is one of the main sources of organic wastewater pollution in my country due to its characteristics of high toxicity, high toxicity, refractory degradation, and wide range of water quality fluctuations. According to statistics from relevant departments, my country currently produces about 1.6 billion tons of bleaching and dyeing wastewater every year, ranking first in the entire industrial wastewater discharge six. In addition, due to the development of chemical fiber fabrics, the rise of imitation silk and the progress of printing and dyeing finishing technology in recent years, PVA pulp, rayon alkali hydrolyzate (mainly phthalic aci...

AI Technical Summary

Problems solved by technology

In addition, due to the development of chemical fiber fabrics, the rise of imitation silk and the progress of printing and dyeing finishing technology in recent years, PVA pulp, rayon alkali hydrolyzate (mainly phthalic acid substances), new additives, etc. are difficult to biochemically degrade A large amount of organic matter enters the wastewater, and the difficulty of bleaching and dyeing wastewater treatment is also increasing. The current process can no longer completely treat such wastewater, and traditional treatment methods are severely challenged.

In addition, traditional processing methods still have disadvantages such as large amount of chemical agents used, high processing cost, large land occupation, complex process, large investment scale, and low wastewater reuse rate.

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