An integrated process for separation, treatment and reuse of package yarn printing and dyeing wastewater

Abstract

The invention discloses an integration process for grading treatment and reuse of cone yarn printing and dyeing wastewater, and is characterized in that the cone yarn printing and dyeing wastewater isgraded and collected according to the concentration and characteristics of pollutants and is divided into high-concentration wastewater and low-concentration wastewater; two wastewater treatment processes are established at an enterprise printing and dyeing wastewater treatment station respectively for two kinds of wastewater with different concentrations, a pretreatment and biochemical combination process is adopted for the high-concentration wastewater, organic matters in the wastewater are effectively removed, and indirect discharge standards of enterprises are met; and a pretreatment, biochemical treatment and advanced treatment technology is adopted for the low-concentration wastewater and is used for effectively removing pollutants in the wastewater, and the effluent COD concentration reaches the water inlet requirements of a double-membrane filtration system. The membrane pollution can be effectively controlled and the membrane operation period and service life are prolonged while up-to-standard discharge and grading reuse of the cone yarn printing and dyeing wastewater in the enterprises and effective removal of degradation-resistant dyes and derived aniline and auxiliaryagents are achieved. The integration process has the advantages of simple process, low cost and easy engineering.

Description

Technical field[0001]The invention relates to an integrated process for the quality classification treatment and reuse of cheese printing and dyeing wastewater, and 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 average was...

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. After the high-concentration and low-concentration wastewater are collected and mixed, they will be uniformly treated by physical and chemical coagulation, biodegradation, advanced oxidation and other processes to meet the indirect discharge standards, and part of the effluent will be diverted to The advanced treatment tank reaches the recycling standard after being treated by the membrane combination process, 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 partial split treatment of mixed wastewater, since some organic matter in the mixed wastewater and dyeing agents and color fixing agents represented by inorganic salts such as sodium sulfate and soda ash are difficult to be effectively removed in the mixed treatment, in the advanced treatment of double membrane filtration Membrane fouling such as membrane pore clogging is likely to occur during the process, which reduces the service life of the membrane

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