title: Recovery of energy and nutrient resources from cattle paunch waste using temperature phased anaerobic digestion.
abstract: Cattle paunch is comprised of partially digested cattle feed, containing mainly grass and grain and is a major waste produced at cattle slaughterhouses contributing 20-30% of organic matter and 40-50% of P waste produced on-site. In this work, Temperature Phased Anaerobic Digestion (TPAD) and struvite crystallization processes were developed at pilot-scale to recover methane energy and nutrients from paunch solid waste. The TPAD plant achieved a maximum sustainable organic loading rate of 1-1.5kgCODm(-3)day(-1) using a feed solids concentration of approximately 3%; this loading rate was limited by plant engineering and not the biology of the process. Organic solids destruction (60%) and methane production (230LCH4kg(-1) VSfed) achieved in the plant were similar to levels predicted from laboratory biochemical methane potential (BMP) testing. Model based analysis identified no significant difference in batch laboratory parameters vs pilot-scale continuous parameters, and no change in speed or extent of degradation. However the TPAD process did result in a degree of process intensification with a high level of solids destruction at an average treatment time of 21days. Results from the pilot plant show that an integrated process enabled resource recovery at 7.8GJ/dry tonne paunch, 1.8kgP/dry tonne paunch and 1.0kgN/dry tonne paunch.
authors.affiliation: Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia. Electronic address: p.jensen@uq.edu.au.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Jensen
authors.affiliation: Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia. Electronic address: c.mehta@awmc.uq.edu.au.
authors.forename: Chirag M
authors.initials: CM
authors.lastname: Mehta
authors.affiliation: Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia. Electronic address: c.carney@awmc.uq.edu.au.
authors.forename: Chris
authors.initials: C
authors.lastname: Carney
authors.affiliation: Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia. Electronic address: damienb@awmc.uq.edu.au.
authors.forename: D J
authors.initials: DJ
authors.lastname: Batstone
mesh_terms: D000003:Abattoirs; D000693:Anaerobiosis; D000822:Animal Husbandry; D000818:Animals; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D002417:Cattle; D008697:Methane / Q000032:analysis; D012037:Refuse Disposal; D062611:Solid Waste / Q000032:analysis*; D013696:Temperature; D018505:Waste Management / Q000379:methods*
chemical_list: D056804:Biofuels; D062611:Solid Waste; D008697:Methane
keywords: Anaerobic digestion; Biogas; Nutrient recovery; Paunch; Slaughterhouse; Struvite