Background:

      The textile printing and dyeing industry is a major consumer of water resources and emitter of wastewater, which contains a large amount of dyes, auxiliaries, and organic compounds, making treatment difficult and costly.

      Solution:

      A textile printing and dyeing enterprise has implemented a zero discharge wastewater transformation project, using a combination of various technologies such as coagulation sedimentation, biological treatment, membrane separation, and advanced oxidation. Firstly, suspended solids and some organic matter in wastewater are removed through coagulation and sedimentation; Then, utilizing biological treatment techniques (such as anaerobic aerobic processes) to remove most of the organic matter; Next, the water quality is further purified through membrane separation technologies such as ultrafiltration, nanofiltration, and reverse osmosis; Finally, for organic compounds that are difficult to degrade, advanced oxidation techniques such as ozone oxidation, Fenton oxidation, etc. are used for deep treatment. The treated water quality meets the standards for circulating water or reclaimed water reuse, achieving zero discharge of wastewater.

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