INNOVATIVE TECHNOLOGIES IN CLEANER PRODUCTION AND CENTRALIZED TREATMENT FOR SEGREGATED STREAMS FOR RECOVERY OF QUALITY SALT & WATER FOR REUSE

摘要

The conventional Zero Liquid Discharge (ZLD) system adopted by South Indian Tanneries consist of (i) Collection of effluent from all sectional operations starting from soaking to finishing as a mixed single stream, (ii) Conventional physiochemical and biological treatment for reduction of Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), etc., (iii) Ultra-filtration and Reverse Osmosis (RO) system for recovery of water, (iv) Multiple Effect Evaporator (MEE) for the evaporation of RO reject stream and generation of mixed salt and (v) Storage of mixed salt recovered from the MEE system.