Abstract

Textile dyeing industries in Erode and Tirupur district of Tamilnadu (India) discharge effluents ranging between 100 and 200m³/t of production.  Dyeing is performed by Jigger or advanced Soft Flow reactor process.  Coloring of hosiery fabric takes place in the presence of high concentration of sodium sulphate or sodium chloride (30 – 75 kg/m³) in dye solutions.  Wash water and dye bath waste water are the process effluents of dyeing industry which are collected separately and follow the advanced treatment for maximum recycling of recovered waters.

Wash water is treated using a sequence of physicochemical and biological unit process, the waste water is passed into ultrafiltration (UF), two stages reverse osmosis (RO) membrane system where the permeate is reused for processes.  The rejects about 10 – 12 % of the inlet volume is subject to reverse osmosis for sent to evaporators.  Dye bath water after treating, the permeate is used in process for dye bath preparation and the reject of about 20 – 25% is sent to multi effect evaporator / solar evaporation pond (SEP).  The final rejects from reverse osmosis system is directed to multi effect evaporator system where condensed waters are recovered.  The removal of Total Dissolved Solids (TDS), Chemical Oxygen Demand (COD) and Chloride are in the range of 82 – 97%, 90 – 97% and 78 – 97% respectively.  This study was carrier out Common Effluent Treatment Plant (CETP), Perundurai, SIPCOT, Erode district.

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