Biogas recovery from piggery wastewater by anaerobic digestion

Biogas recovery from piggery wastewater by anaerobic digestion
ABR; methane recovery; piggery wastewater; two-phase anaerobic process; UASB
Issue Date
2009 International Workshop Developing Bioenergy and Conserving the Natural Ecosystem in APEC Member Economics
VOL 1, NO 1, 115-128
The purpose of this study is to investigate the performances of organic removal and methane recovery from high-strength piggery wastewater by using a full scale two-phase anaerobic system. The full scale two-phase anaerobic process consisted of an acidogenic ABR (Anaerobic Baffled Reactor) and a methanogenic UASB (Upflow Anaerobic Sludge Blanket) reactor. The volumes of acidogenic and methanogenic reactors were designed to be 28.3 m3 and 75.3 m3, respectively. The two-phase anaerobic system showed 60-82% of COD removal efficiency with influent COD concentration in the range of 7,150 to 16,270 mg L-1 and its averaged value was 10,280 mg/L after screening. After steady-state, the effluent COD concentration from the methanogenic reactor was 2,740 ± 330 mg L-1 with an averaged removal efficiency of 71.4% at an operating temperature ranged from 19 to 32℃. The effluent SCOD concentration was in the range of 2,000-3,000 mg L-1 at steady state while volatile fatty concentration was not detected in the effluent. The COD removal efficiency in the acidogenic reactor was below 5%. The acidogenic reactor played key roles in reducing a shock-loading, when accidental shock loads were occurred, and in acidifying influent organics.
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