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Nitrogen Removal of Municipal Wastewaters Using a Floodplain Filtration Technique

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  032152,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14020) @2003
Authors:   Sobhalatha P. Kunjikutty, Shiv. O. Prasher, Seung-Hyun Kim
Keywords:   Floodplain Filtration, Lysimeters, Wastewater, Nitrate, Ammonium, Pollution, Environment, Water Quality

The wide natural flood plains of many rivers and streams can be used for filtration to remove contaminants from secondary treated wastewaters. If contaminated river water is sprayed over the floodplain, the water-borne organic matter can be expected to decompose under the action of soil microbes and in this process NO3 -, an electron acceptor, can be simultaneously removed by denitrification. A lysimeter study was undertaken to study three different wastewater application rates and a comparison of two topsoil conditions, i.e. bare soil vs sod. It was found that 30 l/d flow rate was more efficient in removing nitrate and ammonium from wastewater than both 50 l/d and 10 l/d. There was no significant difference between the two top conditions. The floodplain filtration technique requires no chemicals additives and produces no sludge, making it an environmentally friendly process. For relatively low contaminant concentrations, its construction and operation costs would also be lower than those of conventional techniques.

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