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SEQUENTIAL COAGULATION STUDIES FOR PRIMARY TREATMENT OF TEXTILE PROCESS EFFLUENT INSTEAD OF ACID NEUTRALIZATION

Abstract

Sequential coagulation studies were carried out for primary treatment of textile effluent from different processing units at Ichalkaranji by using jar test apparatus. Various combinations of Alum, Ferric chloride and Lime, were used for the studies. It has been observed that of all the pH values, maximum (65-90%) reduction in COD, (80 to 85%) in colour and TDS removal upto (30-40%) of the actual process effluent is possible to achieve. As far as heavy metal(s) removal is concerned at the said pH, it can be seen that the maximum removal of Ni and Pb upto approx. 99% was observed. Findings of other heavy metals removal, i.e. Cd (96%), Cr (total) (80-90%), Cu (90%), Zn (80 to 90%) and Fe (80%) was observed in various combinations of Alum, Ferric chlorine and Lime, for primary treatment. Such primarily treated textile effluent can be easily treated by biological means.

b.V. KULKARNI , s. v. RANADE and a. i. WASIF

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