Honors College Thesis
 

Anaerobic co-digestion of acid whey and sewage sludge for enhanced renewable energy production

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https://ir.library.oregonstate.edu/concern/honors_college_theses/rn3018740

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  • Acid whey is the largest byproduct of the dairy industry but to date has few useful applications and is frequently discarded as a result. However, acid whey has a high carbon content, making it a suitable co-substrate for anaerobic co-digestion with raw sewage sludge. The synergistic effect of co-digestion has the potential to increase biogas yields for renewable energy production. As such, there is need to quantify the biochemical methane potential (BMP) of acid whey and estimate methane yield at various loading rates. The BMP of acid whey and sewage sludge co-digestion was determined through bench scale laboratory experiments and found to be 333 +/- 12.1 mL CH4/g VS acid whey. A Monod kinetics-based model was developed to approximate the potential methane production at various acid whey loading rates in a full-scale anaerobic digester. The maximum predicted methane yield for an 800,000 gal. anaerobic digester with a 30-day hydraulic retention time was 2852 ft^3 CH4/day when the influent acid whey loading rate is 4080 kg/day.
  • Keywords: Acid whey, Anaerobic Digestion, Co-digestion, Biochemical Methane Potential (BMP)
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  • DeVaan Endowment for Undergraduate Experiential Learning
  • NSF CAREER Grant # 1847654
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