Quality-dividing treatment and recycle integrated process for cotton printing and dyeing wastewater

Abstract

The invention discloses a quality-dividing treatment and recycle integrated process for cotton printing and dyeing wastewater. The process is characterized by comprising the following steps: collecting the cotton printing and dyeing wastewater in a quality dividing manner according to concentration and characteristics of pollutants into high concentration wastewater and low concentration wastewater; establishing two wastewater treatment processes in an enterprise printing and dyeing wastewater treatment station for two types of wastewater of different concentrations, separately, wherein organic matters in the high concentration wastewater are removed effectively by means of a pre-treatment and biochemical combination process to achieve the enterprise indirect discharge standard; and pollutants in the low concentration wastewater are removed effectively by means of a pre-treatment, biochemical treatment and advanced treatment process, so that effluent reaches the rinsing and reusing standard and resource utilization of wastewater is achieved. The resource utilization ratio of the wastewater can be improved effectively while the cotton printing and dyeing wastewater is discharged andreused in a quality dividing manner by reaching the standard, degradation-resistant dyes and derived aniline and auxiliary agents thereof are removed effectively. The process is simple, the cost is relatively low, and engineering is easy.

Description

Technical field [0001] The invention relates to an integrated process for quality classification treatment and reuse of cotton printing and dyeing wastewater, which belongs to the technical field of environmental protection. Background technique [0002] The textile industry is a pillar industry of my country's national economy and an important civilian production industry. It is also an industry with strong international competitiveness. At the same time, the textile industry is my country's largest resource and energy-intensive industry, and it is a typical high-polluting industry. Among them, the discharge of wastewater pollutants in the textile industry has always been the most sensitive issue in environmental pollution control. The textile industry’s wastewater discharge volume and total pollutant discharge have always ranked 3 to 4 in the national industrial industry, and it is one of the industries with the largest water and drainage volume. In recent years, the annual ave...

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment of printing and dyeing wastewater is mainly a method of centralized collection and unified treatment. The wastewater discharged from different printing and dyeing processes is collected uniformly, and after mixing, it is uniformly treated by physical and chemical coagulation, biodegradation, advanced oxidation and other processes to meet the indirect discharge standards. Part of the effluent is diverted to The deep treatment tank makes the treated effluent meet the reuse standard, but the unified mixed treatment of high-concentration wastewater and low-concentration wastewater generally has the problem of high investment and operation costs

Especially in the process of partial separation treatment of mixed wastewater, because some organic matter in mixed wastewater and dyeing agents and color fixing agents represented by inorganic salts such as sodium sulfate and soda ash cannot be effectively removed in the mixed treatment, the advanced treatment process is complicated, Increased costs

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