title: Performance evaluation of a completely stirred anaerobic reactor treating pig manure at a low range of mesophilic conditions.
abstract: Many Chinese biogas plants run in the lower range of mesophilic conditions. This study evaluated the performance of a completely stirred anaerobic reactor treating pig manure at different temperatures (20, 28 and 38°C). The start-up phase of the reactor at 20°C was very long and extremely poor performance was observed with increasing organic loading rate (OLR). At an OLR of 4.3g ODML(-1)d(-1), methane production at 28°C was comparable (3% less) with that at 38°C, but the risk of acidification was high at 28°C. At low OLR (1.3g ODML(-1)d(-1)), the biogas process appeared stable at 28°C and gave same methane yields as compared to the reactor operating at 38°C. The estimated sludge yield at 28°C was 0.065g VSSg(-1) CODremoved, which was higher than that at 38°C (0.016g VSSg(-1) CODremoved).
authors.affiliation: Department of Environmental Engineering, Tsinghua University, Beijing 100084, PR China. Electronic address: jianbinguo@gmail.com.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Guo
authors.forename: Renjie
authors.initials: R
authors.lastname: Dong
authors.forename: Joachim
authors.initials: J
authors.lastname: Clemens
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D000641:Ammonia / Q000032:analysis; D000818:Animals; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008372:Manure; D008697:Methane / Q000032:analysis; D013552:Swine; D013696:Temperature; D018505:Waste Management
chemical_list: D005232:Fatty Acids, Volatile; D008372:Manure; D000641:Ammonia; D008697:Methane
keywords: Anaerobic digestion; Organic loading rate; Pig manure; Sludge yield; Temperature