Application of Packed-Bed Upflow Towers in Two-Phase Anaerobic Digestion,
INSTITUTE OF GAS TECHNOLOGY CHICAGO ILL
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The purpose of this research was to investigate the applicability of anaerobic upflow packed beds to serve as the methane-phase digester of an overall two-phase digestion system. In the two-phase anaerobic digestion process, the sequential acid and methane fermentation steps of the overall digestion process are optimized in separate reactors 8. Acidic end-products emanating from the first-stage acid-phase digester are ultimately converted to methane in a second-stage methane-phase digester. In this research, laboratory-scale upflow anaerobic filters were operated with acidic effluents from complete-mix acid-phase digesters fed with particulate and soluble feeds. Specifically, the objectives of the work were 1 to ascertain whether upflow anaerobic filters can be operated with feeds containing high concentrations of volatile acids VA, and 2 to evaluate the effects of such operating factors as loading rate, HRT, effluent recirculation ratio, and digester temperature on the conversion of volatile acids and other products of acid-phase digestion to methane.