CHEMICAL OXYGEN DEMAND (COD) REMOVAL FROM DOMESTIC WASTEWATER USING FORTIFIED SOIL-CLAYS.T. RAMESHL., R. GANDHIMATHP, P. V. NIDHEESI-P AND G. PRAVEEN KUMARAbstract The quest for simple, low cost and high performance decentralized wastewater system for domestic application necessitated this study. The characterization of Soil-Clay was done by using grain size distribution curve method. It was found that 95% of Soil-Clay and 5% of fine sand. The flow rate studies were carried out to determinc the residence time of wastewater in each percolating media of the fortified clay. Performance efficiency studies were conducted to determine the best combination percentages of soil clay with pebbles, concrete waste material and limestone. Mixing and individual layer of treatments methods were empolyed for removal efficiency of COD using single coloum reactor. The maximum removal efficiency of COD was found to be 98% for soil clays-limestone mixed system. All the systems have the maximum COD removal greater than 90%. So the present combinations can be used for COD removal from wastewater.
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