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The District of Columbia Water and Sewer Authority (DCWASA) has undertaken a long-term study to evaluate the performance and operational aspects of various sludge digestion alternatives. While the initial goal of this study was to determine an appropriate digestion technology for Blue
Plains Advanced Wastewater Treatment Plant, the outcome has been an increased awareness of the fundamental digestion parameters that impact solids degradation. These studies have been performed since 2003 at Virginia Polytechnic Institute and State University (VT) with a consistent reactor
design and operational protocol so as to allow direct comparison between digestion technologies. In addition, conventional mesophilic anaerobic digestion has been maintained nearly continuously at VT over the course of the project in order to observe any potential shifts in the biodegradability
of the source sludge from Blue Plains. To date, detailed investigations have been performed on the following technologies (each with significant operational variation, e.g. solids retention time, temperature, etc.): Single Stage Digestion: Mesophilic
anaerobic digestion (MAD)* Thermophilic anaerobic digestion (49–58°C)* Multiple Stage Digestion: Acid Gas Anaerobic Digestion (AGAD) Temperature
Phased Anaerobic Digestion (TPAD) Cambi Thermal Hydrolysis followed by MAD* *Post aerobic digestion following these technologies has also been investigated. This paper summarizes these
digestion process evaluations by investigating the effect of global system variables (e.g. digester temperature, anaerobic staging, anaerobic/aerobic staging) on solids removal efficiency and when applicable, nutrient and odor reduction potential.
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 These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.