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Journal of Applied Sciences
Year: 2010  |  Volume: 10  |  Issue: 7  |  Page No.: 558 - 563

Drinking Water Denitrification in a Packed Bed Anoxic Reactor: Effect of Carbon Source and Reactor Depth

Saleh Faraj Magram    

Abstract: The main aim of this study was to investigate the effect of various carbon sources on the performance of anoxic upflow packed-bed reactor to remove nitrate from drinking water. The study further investigated the degree of removal of nitrate at different depths of reactors for determining the optimum depth. Nitrate contaminated groundwater is becoming a serious problem in many parts of the world. In view of the cost and toxic sludge production by the physico-chemical processes, biological treatment processes are preferable; however, the available studies have reported a wide range of denitrification performance depending on the carbon source and reactor type. In this study, the denitrification was the best in case of ethanol (average residual NO3 ¯ concentration of 15 mg L-1 with an influent concentration of around 200 mg L-1), while formic acid showed the worst performance. Denitrification performance in case of each carbon source varied depending on the depth of the reactor. Nevertheless, the fact that nitrate removal was achieved without encountering accumulation of nitrite makes the developed process very attractive.

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