The Combined Activated Sludge-Anaerobic Digestion Model (CASADM) quantifies the effects of recycling anaerobic-digester (AD) sludge on the performance of a hybrid activated sludge (AS)-AD system. The model includes nitrification, denitrification, hydrolysis, fermentation, methanogenesis, and production/utilization of soluble microbial products and extracellular polymeric substances (EPS). A CASADM example shows that, while effluent COD and N are not changed much by hybrid operation, the hybrid system gives increased methane production in the AD and decreased sludge wasting, both caused mainly by a negative actual solids retention time in the hybrid AD. Increased retention of biomass and EPS allows for more hydrolysis and conversion to methane in the hybrid AD. However, fermenters and methanogens survive in the AS, allowing significant methane production in the settler and thickener of both systems, and AD sludge recycle makes methane formation greater in the hybrid system.
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- A Combined Activated Sludge Anaerobic Digestion Model (CASADM) to Understand the Role of Anaerobic Sludge Recycling in Wastewater Treatment Plant Performance
- Young, Michelle (Author)
- Marcus, Andrew (Author)
- Rittmann, Bruce (Author)
- Biodesign Institute (Contributor)
- Swette Center for Environmental Biotechnology (Contributor)
- Digital object identifier: 10.1016/j.biortech.2013.02.090
- Identifier TypeInternational standard serial numberIdentifier Value0960-8524
- “NOTICE: this is the author’s version of a work that was accepted for publication in Bioresource Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Bioresource Technology, 136, 196-204. doi:10.1016/j.biortech.2013.02.090", opens in a new window
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Please cite this article as: Young, M.N., Marcus, A.K., Rittmann, B.E., A Combined Activated Sludge Anaerobic Digestion Model (CASADM) to Understand the Role of Anaerobic Sludge Recycling in Wastewater Treatment Plant Performance, Bioresource Technology (2013), doi: http://dx.doi.org/10.1016/j.biortech.2013.02.090