INVESTIGATION OF DOMINANT LEACHING FACTORS FOR RELEASE OF CR FROM INDIAN FLY ASHMANOJ KUMAR TIWARI, SAMIR BAJPAI AND UMESH KUMAR DEWANGANAbstract Among various factors involved in a leaching process, pH, time of leaching and particle size is most fundamental and generally responsible for release of heavy metal to the environment. These factors are widely used to predict the leaching potential of industrial solid wastes. A laboratory batch leaching experiment was conducted with different leaching factors (pH from 2.64 to 8.23; time 16 to 720 hrs; particle size as fine (<0.075 mm), medium (4.75-0.075 mm) and coarse (>4.75 mm). Taguchi design approach with L9 orthogonal array was used to evaluate the effect of these leaching parameters. The input factors consist of pH, time period of leaching, and particle size of solid waste with Cr concentration as the output. A pH range of 4 to 7, leaching contact time of 360 hrs, and fine particle size (<0.075 mm) were observed as the most favorable leaching conditions. The results confirm that size of particles has a dominant effect than pH, then time of leaching.
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