349516 The Effects of Feeding Schedules on the Anaerobic Digestion of Swine Waste

Monday, November 4, 2013
Grand Ballroom B (Hilton)
James Sheehan, Illinois Institute of Technology, Chicago, IL

Six 500mL reactors were operated under a 21-day SRT and an OLR of 2.4 kg VS/m3-day in order to treat swine waste by anaerobic digestion (AD). Influent was introduced into the reactors under three different schedules. Two reactors were operated at weekly, daily, and 3 times feeding schedules. The reactors were fed with slurry of swine waste and ground water (0.287 kg solid waste per L of groundwater). The reactors were used to assess the effects these feeding schedules have on AD, specifically on the production of biogas, the overall physical and chemical quality of the effluent, and pathogen reduction. The reactors fed daily, 3-times a week, and weekly had methane yields and volatile solids reductions of: 0.17 m3 CH4/kg VS added, 0.20 m3 CH4/kg VS added, 0.14 m3 CH4/kg VS added, 41.8%, 42.4%, and 42.8% respectively. There was no statistical significance in the variance between these values. The reactors fed daily, 3-times a week, and weekly were able to reduce Salmonella concentrations by 99.82%, 99.64%, and 98.50% respectively. The effluent quality would unlikely meet the USEPA’s Class B Biosolids standards and would require further treatment before it could be used in any applications.

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