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Measuring Influent Heterotrophic Biomass Content for Modeling and Design

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Appreciable active heterotrophic biomass (ZBH) content in the influent wastewater has significant implications for plant design and performance. The traditional batch test method for measuring the active heterotrophic biomass content in municipal influent wastewater is presented. Correct estimation of OUR is important, and a technique to account for surface ingress of oxygen is presented. The traditional analysis method cannot be applied when influent biomass concentration is high. An alternative approach is presented based on simulating batch test OUR response. Initial analysis of OUR tests conducted on the Blue Plains AWT raw influent indicates a biomass content in the range of 15 to 30% of the influent COD. Potential reasons for the apparent high biomass content in the two influent streams to the Blue Plains AWT (and one of three nearby plants) are not readily apparent. However, this finding demonstrates the value of site specific measurement of influent active biomass content as part of wastewater characterization for process modelling and design.

Keywords: Influent wastewater; biomass; wastewater characteristics

Document Type: Research Article


Publication date: January 1, 2010

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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