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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

Description

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…

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.
ContributorsYoung, Michelle (Author) / Marcus, Andrew (Author) / Rittmann, Bruce (Author) / Biodesign Institute (Contributor) / Swette Center for Environmental Biotechnology (Contributor)
Created2013-08-13

Moving Ground

Description

The ASU School of Dance presents Moving Ground, November 16-19, with works by dance faculty, graduate, and visiting artists, performed at the Dance Studio Theatre, PEBE 132.

ContributorsLathrop, Cerrin (Choreographer) / Stevens, Sufjan (Musician) / Scott, Jillian (Costume designer) / Dessingue, Collete (Dancer) / Doherty, Kelley (Dancer) / Grabianowski, Nicole (Dancer) / Kirwan, Molly (Dancer) / Kuo, Alexis I-Cheng (Dancer) / Roberts, Cassie (Dancer) / McGloin, Aaron (Choreographer, Dancer) / Marcus, Andrew (Choreographer, Dancer) / Afanador, Kathlea (Dancer) / DeVincenzo, Rachel (Dancer) / Fisher, Rose (Dancer) / Hancock, Whitney (Dancer) / Hendrix, Robbia (Dancer) / Kettner, Lauren (Dancer) / Mumford, Jessica (Dancer) / Ramey, Alyssa (Dancer) / Piver, Harper (Dancer) / Caban, Francesco Gabrial (Choreographer, Costume designer, Dancer) / Caban, Fred (Composer) / Ma, Shouze (Choreographer) / Harrison, Christina (Dancer) / Kosowski, Jenna (Dancer) / Woodbridge, Holly (Dancer) / Parish, Sara (Dancer) / Mesman, Travis (Dancer) / Pärt, Arvo (Musician) / Nidrei, Kol (Musician) / Sieber, Jami (Musician) / Bruch, Max (Musician) / Chipaumire, Nora (Choreographer) / Jackson, Mahalia (Musician) / Caron, Bridgette (Dancer) / Cortez, Sarah (Dancer) / Dessingue, Colette (Dancer) / Basting, Samantha (Dancer) / DeVries, Deborah (Dancer) / Massiah, Monique (Dancer) / Ross, Janie (Dancer) / Schwab, Katherine (Dancer) / Spondello, Alison (Dancer) / Tovson, Kristin (Dancer) / Wajih, Sonja (Dancer) / Mooney, Elina (Artistic director) / Swayze, William (Sound designer) / Benard, Jacqueline (Costume designer) / Mihaleva, Galina (Costume designer) / Ammerman, Mark C. (Technical director, Set designer) / Koch, Carolyn (Production manager, Lighting designer)
Created2006

Andrew Marcus, MFA Thesis Performance

Description

The ASU School of Dance presents MFA Thesis Performance, October 26, with works by dance MFA candidate Andrew Marcus, performed at Dance Studio Theatre.

ContributorsKoch, Carolyn (Lighting designer) / Marcus, Andrew (Performer) / Vesseur, Wilma (Performer) / Herberger Institute School of Dance (Publisher)
Created2007
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pH-Mediated Microbial and Metabolic Interactions in Fecal Enrichment Cultures

Description
pH and fermentable substrates impose selective pressures on gut microbial communities and their metabolisms. We evaluated the relative contributions of pH, alkalinity, and substrate on microbial community structure, metabolism, and functional interactions using triplicate batch cultures started from fecal slurry and incubated with an initial pH of 6.0, 6.5, or…

pH and fermentable substrates impose selective pressures on gut microbial communities and their metabolisms. We evaluated the relative contributions of pH, alkalinity, and substrate on microbial community structure, metabolism, and functional interactions using triplicate batch cultures started from fecal slurry and incubated with an initial pH of 6.0, 6.5, or 6.9 and 10 mM glucose, fructose, or cellobiose as the carbon substrate. We analyzed 16S rRNA gene sequences and fermentation products. Microbial diversity was driven by both pH and substrate type. Due to insufficient alkalinity, a drop in pH from 6.0 to ~4.5 clustered pH 6.0 cultures together and distant from pH 6.5 and 6.9 cultures, which experienced only small pH drops. Cellobiose yielded more acidity than alkalinity due to the amount of fermentable carbon, which moved cellobiose pH 6.5 cultures away from other pH 6.5 cultures. The impact of pH on microbial community structure was reflected by fermentative metabolism. Lactate accumulation occurred in pH 6.0 cultures, whereas propionate and acetate accumulations were observed in pH 6.5 and 6.9 cultures and independently from the type of substrate provided. Finally, pH had an impact on the interactions between lactate-producing and -consuming communities. Lactate-producing Streptococcus dominated pH 6.0 cultures, and acetate- and propionate-producing Veillonella, Bacteroides, and Escherichia dominated the cultures started at pH 6.5 and 6.9. Acid inhibition on lactate-consuming species led to lactate accumulation. Our results provide insights into pH-derived changes in fermenting microbiota and metabolisms in the human gut.
ContributorsIlhan, Zehra (Author) / Marcus, Andrew (Author) / Kang, Dae-Wook (Author) / Rittmann, Bruce (Author) / Krajmalnik-Brown, Rosa (Author) / Biodesign Institute (Contributor) / Swette Center for Environmental Biotechnology (Contributor) / College of Liberal Arts and Sciences (Contributor) / School of Life Sciences (Contributor) / Fundamental and Applied Microbiomics (Contributor) / Ira A. Fulton Schools of Engineering (Contributor) / School of Sustainable Engineering and the Built Environment (Contributor)
Created2017-05-03