The Optimization of Nitrification and Denitrification in Plug-Flow Activated Sludge Systems Treating Municipal Wastestreamsby P. T. Jarrett, AWARE Inc, Nashville, TN, USA,
W. W. Eckenfelder, AWARE Inc, Nashville, TN, USA,
M. C. Goronzy, AWARE Inc, Nashville, TN, USA,
Abstract: Most conventional plug-flow activated sludge plants experience nitrification, particularly during higher temperature conditions. Under these circumstances, additional power is required to maintain adequate dissolved oxygen concentrations. Denitrification in the final clarifiers is frequently experienced which often results in floating sludge and subsequent degradation of effluent quality. It has been shown that simple operational modifications and dissolved oxygen control in the aeration basins enables denitrification to be achieved to varying predictable levels. In a pilot plant study, denitrification employing an internal recycle resulted in an improvement in sludge settling over conventional operation.
Subject Headings: Dissolved oxygen | Denitrification | Chemical treatment | Activated sludge | Nitrogen | Temperature effects
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