Analysis of untreated chrome electroplating effluent procured from electroplating unit showed that it was acidic in nature (pH=1.51) and it contains Cr(VI) at the concentration 70.74±0.31 ppm. This effluent is used for further experiments. Removal of chromium from effluent was achieved in two steps. In first step Cr(VI) was reduced to Cr(III) by reaction with H2O2 and 0.6 ml 30% H2O2 was found sufficient for complete reduction of Cr(VI) from 1 liter of effluent. Then in second step Cr(III) was removed from effluent by precipitating it as Cr(OH)3 in presence of activated charcoal. In absence of activated charcoal pH at which Cr(III) get precipitated, it has been observed that some quantity of Cr(III) oxidizes to Cr(VI) again. Removal of Cr(III) is governed by pH of solution and at pH 6.5 to 7.0 more than 99.00% of Cr(III) has taken place. By this process chromium removal efficiency was observed more than 99.00%. After bench scale experiment process was tried at pilot scale and designed process was found highly efficient on pilot scale for removal of chromium from electroplating effluent.

Author Name: Sujata S. Modhave, Dnyaneshwar R. Shinde

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Keywords: IJSER,2229-5518,22295518,Sujata S. Modhave, Dnyaneshwar R. Shinde

ISSN: 22295518

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