title: Anaerobic digestion of paunch in a CSTR for renewable energy production and nutrient mineralization.
abstract: A laboratory study investigated the anaerobic digestion of paunch in a continuous stirred tank reactor (CSTR) for the recovery of biogas and mineralization of nutrients. At an organic loading rate (OLR) of 2.8gVSL(-1)day(-1) with a 30-day hydraulic retention time (HRT), a CH4 yield of 0.213Lg(-1)VS and CH4 production rate of 0.600LL(-1)day(-1) were obtained. Post-anaerobic digestion of the effluent from the CSTR for 30days at 40°C recovered 0.067Lg(-1)VS as CH4, which was 21% of the batch CH4 potential. Post-digestion of the effluent from the digestate obtained at this OLR is needed to meet the stable effluent criteria. Furthermore, low levels of soluble ions such as K(+), Ca(2+) and Mg(2+) were found in the liquid fraction of the digestate and the remainder could have been retained in the solid digestate fraction. This study demonstrates the potential of biogas production from paunch in providing renewable energy. In addition, recovery of plant nutrients in the digestate is important for a sustainable agricultural system.
authors.affiliation: Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Ave S. Lethbridge, Alberta T1J 4B1, Canada.
authors.forename: Valentine Nkongndem
authors.initials: VN
authors.lastname: Nkemka
authors.affiliation: Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Ave S. Lethbridge, Alberta T1J 4B1, Canada.
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Marchbank
authors.affiliation: Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Ave S. Lethbridge, Alberta T1J 4B1, Canada. Electronic address: xiying.hao@agr.gc.ca.
authors.forename: Xiying
authors.initials: X
authors.lastname: Hao
mesh_terms: D000383:Agriculture; D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D002118:Calcium / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008274:Magnesium / Q000737:chemistry; D008372:Manure; D008697:Methane / Q000737:chemistry; D011188:Potassium / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D056804:Biofuels; D008372:Manure; D014867:Water; D008274:Magnesium; D008697:Methane; D011188:Potassium; D002118:Calcium
keywords: Anaerobic digestion; CSTR; Digestate; Organic loading rate; Slaughterhouse waste