Factors Affecting the Quality of the Plant Influent and Its Suitability for Prefermentation and the Biological Nutrient Removal Process
Publication: Journal of Environmental Engineering
Volume 137, Issue 12
Abstract
To understand wastewater quality transformations in the sewer system, a full-scale study focused on the characteristics of the influent wastewater in a middle-sized wastewater-treatment plant receiving only municipal sewage. The objective was to identify conditions in which prefermentation prior to the biological nutrient removal (BNR) process would be useful. Prefermentation aims at increasing the fraction of readily biodegradable organic matter in the wastewater. A correlation between weather conditions and the presence of readily biodegradable organic matter in the feed wastewater was found, but contrary to the expectations, wet weather periods deteriorated the quality of the feed water more than the cold period. Moreover, influent load showed seasonal variation which changes in discharged wastewater could not explain. During the warm water period, significant biological oxidation and nitrogen removal took place in the sewer system, but the plant influent water contained readily biodegradable organic matter and potential for its formation during the warmest period. It was concluded that prefermentation would be mostly needed during the wet weather period. In addition, the study offered valuable information about the seasonal behavior of the sewer network.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 137 • Issue 12 • December 2011
Pages: 1185 - 1192
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 9, 2010
Accepted: Jun 2, 2011
Published online: Jun 4, 2011
Published in print: Dec 1, 2011
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