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Water recycling in the textile finishing industry

November 22, 2002

The treatment and recycling of colored wastewater from dyestuffs producing and textile finishing industries have always been a non-trivial problem for the sewage engineering sector. The recycling of process water of textile mills is often hindered by remaining colour of azo-dyes after conventional wastewater treatment. Because of rising costs of emitted wastewater, lawful limits and restricted availability of water it is of great interest to introduce sophisticated techniques to achieve purification of dye effluents and to recycle process water.

Approach

A combined biological and chemical process for the purification of residual dyehouse liquors containing reactive azo-dyes was developed and investigated by the Institute of Biochemical Engineering of the Technical University of Braunschweig, Germany, The process contain anaerobic dye-cleavage, aerobic mineralization of cleavage-products and the decolorization and partial oxidation with ozone of traces of dye-residuals. A technical treatment and recycling plant has been installed at a medium sized textile mill Drews Meerane GmbH (Meerane in Saxonia, Germany) which produces 12 Mill. meter of colored textiles per year and wastewater effluents of 330,000 m3 per year. The share of recycling water is amounted to 60 %. The process works economically at a share of water recycling of 26 %.

Advantages

By means of the biological-chemical treatment process it is possible to increase the quality of the treated split flows for recycling purposes as well as the dye capacity of the textile mill and to minimize the operating costs. Furthermore the municipal wastewater treatment plant in which the textile mill introduce their water have not enhance their capacity.

The process has been patented together with Dr.-Ing. Bernd Diering GmbH, Aachen, Germany.

Industrie- und�Handelskammer�

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