Volume No. 2 Issue No.: 2 Page No.: 209-216 October-December 200

 

REMOVAL AND RECOVERY OF HEXAVALENT CHROMIUM FROM INDUSTRIAL WASTE WATER BY PRECIPITATION WITH DUE CONSIDERATION TO COST OPTIMIZATION

 

R.S. Karale*1, D.V. Wadkar and P.B. Nangare2

1. Department of Civil Engineering, RSCOE Pune (INDIA) 2. Department of Civil Engineering, AISSMS COE Pune (INDIA)

 

Received on : August 14, 2007

 

ABSTRACT

 

Chromium is one of the heavy metal coming from various industries having high toxicity. The compounds of chromium especially Cr (VI) are known to be detrimental to human beings and animals. The main objective is to adopt appropriate methods and to develop suitable techniques either to prevent metal pollution or to reduce it to very low levels with due consideration to cost optimization. Extensive chemical analysis was done to detoxify Cr (VI) by reducing it to Cr (III) by using reducing agents such as ferrous sulphate and sodium metabisulphite, and the precipitation of chromium hydroxide by addition of base. Also experiments were conducted to study the effect of reduction time and pH on the reduction of chromium for various doses of reducing agents. In this paper, efforts have been made to highlight the cost economics of removal and recovery of chromium.

 

Keywords : Heavy metal, Pollution, Reducing agents, Chromium removal, Recovery, Precipitating agents, Hexavalent chromium [Cr(VI) ], Trivalent chromium [Cr(III)].

 

 

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