Segregation, characterization and treatment for recycling of wastewater generated from dyes manufacturing industries, dye intermediates manufacturing industries and textile deing and printing industries of Sachin industrial area, Gujarat, India

Abstract

In the present study the characteristics of segregated untreated wastewater generated from dyes and dye intermediates manufacturing industries and textile dyeing and printing industries were studied. Wastewater from 10 units manufacturing different type of dyes and dye intermediates and 10 units involved in textile dyeing and printing, was used for this study. The study shows that the wastewater generated from dyes and dye intermediates manufacturing industries can be segregated at source in two streams concentrated stream and dilute stream. Wastewater was analyzed for pH, Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Dissolved Solids (TDS), Suspended Solids (SS), Chloride, Ammonical Nitrogen, Phenolic Compounds, Hexavalent Chromium, Total Chromium, Nickel, Oil & Grease parameters The study confirms that it is possible to recycle effluent and the treated effluent can be reused for different manufacturing stages, which ultimately reduces the waste water discharges and ultimately helps to conserve precious fresh water resources. In addition to that, concentrated stream can be used to manufacture spent acid and ferrous sulphate, which are potential sources of income for such centralized facility. Entire utility waste water (i.e. waste water generated from boiler, cooling tower) generated from dye intermediate manufacturing industry can be mixed with textile dyeing and printing industry effluent and dyes manufacturing industry effluent and can be treated in conventional CETP, which is operational at Sachin industrial area.