A water reuse system and process for treating printing and dyeing wastewater by quality

Abstract

The invention discloses a system and technology for reuse of printing and dyeing wastewater reclaimed water subjected to quality-based treatment. The process includes: (1) distributing conditioned printing and dyeing wastewater evenly in an oxygen-poor tank by a point-to-point water distributor, sending the oxygen-poor tank effluent water into a mud-film coupled oxygen-rich tank, conducting treatment, then sending the effluent water into a sedimentation tank to conduct sedimentation, then sending the sedimentation tank effluent water into a biological aerated filter to conduct treatment, and sending the effluent water into an intermediate water tank; and (2) subjecting one part of the water in the intermediate water tank to river water purifier and sodium ion exchange treatment, then reusing the water in flushing and color washing procedures of a printing and dyeing workshop; and subjecting the other part to sand filter filtration, ultrafiltration membrane filtration and reverse osmosis membrane filtration in order, and the reusing the water in the dyeing procedure of the printing and dyeing workshop. According to the invention, the printing and dyeing procedure is divided into a high quality water process and a low quality water process, and different water processes adopt different reclaimed water treatment technologies, thus bringing the technical characteristics of reclaimed water reuse into full play, saving energy consumption and improving the reuse rate of reclaimed water.

Description

technical field [0001] The invention relates to the technical field of materials and environmental engineering, in particular to a water reuse system and process for treating printing and dyeing wastewater by quality separation. Background technique [0002] Since the 1990s, the textile printing and dyeing industry has developed rapidly. The textile printing and dyeing industry is one of the traditional pillar industries with advantages in my country. Printing and dyeing enterprises are also large water users and sewage dischargers. my country's textile wastewater discharge ranks sixth in the industry, while Printing and dyeing wastewater accounts for 80% of which, and the reuse rate is only 7%, which is the lowest in all industries in the country. Increasing the reuse rate is an important measure to save water resources. The problem of water use and drainage in the printing and dyeing industry has become increasingly prominent, and the reuse of reclaimed water from printing ...

AI Technical Summary

Problems solved by technology

[0009] The invention provides a water reuse system and process for treating printing and dyeing wastewater by quality, which solves the technical problem of water quality reuse in printing and dyeing wastewater

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