Chemical Oxygen Demand COD Reduction in Domestic

Authors: Rani Devi R P Dahiya

Publish Date: 2006/06/10

Volume: 174, Issue: 1-4, Pages: 33-46

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Abstract

The potential of fly ash brick kiln ash and commercial activated carbon is determined for the reduction of chemical oxygen demand COD from domestic wastewater Laboratory experiments are conducted for investigating the effect of treatment time adsorbent dose pH of the media initial COD concentration agitation speed and particle size of adsorbents on the COD reduction from the domestic wastewater Starting with an initial COD concentration of 1080 mg/l the maximum COD reduction achieved for fly ash was 8784 brick kiln ash was 8322 and commercial activated carbon was 9935 These values were achieved when the wastewater was treated with activated carbon for 180 min fly ash 250 min and brick kiln ash 300 min and the adsorbent dose was kept respectively at 40 g/l 60 g/l and 45 g/l for activated carbon fly ash and brick kiln ash Agitation speed was kept constant at 600 rpm and the pH was maintained at 2 for activated carbon and fly ash and 5 for brick kiln ash The maximum percent reduction is for 0053 mm or smaller size of the particles Though the adsorption capacity of the ash for reducing the COD is lower than that of the commercial activated carbon the low material cost can make it an attractive option for the treatment of domestic wastewater

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