title: Kinetics evaluation of a semi-continuously fed anaerobic digester treating pig manure at two mesophilic temperatures.
abstract: Anaerobic digestion of animal waste at a low range of mesophilic conditions has not been well described to date. In this study, laboratory-scale semi-continuously fed anaerobic digesters treating pig manure were operated at 28 and 38 °C with organic loading rates ranging from 1.3 to 4.3 g ODM L(-1) d(-1). The estimated biomass yield was higher at 28 °C (0.065 g VSS g(-1) COD(removed)) than at 38 °C (0.016 g VSS g(-1) COD(removed)). The resulting calculated biomass concentration range at 28 and 38 °C was 1.2-2.4 and 0.3-0.6g VSS L(-1), respectively, which fitted well with a Michaelis-Menten type function. These VSS results are one or two orders of magnitude lower than previously reported for manure-fed digesters. Although maximum specific substrate utilisation rate at 38 °C is five-fold that at 28 °C, higher biomass yield in the digester at 28 °C seemed to compensate for the adverse effects of lower temperature on digester performance.
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: D000693:Anaerobiosis; D000818:Animals; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D007700:Kinetics; D008372:Manure; D013552:Swine; D013696:Temperature
chemical_list: D008372:Manure
keywords: Anaerobic digestion; Biomass yield; Kinetics; Pig manure; Temperature