title: Potential methane emission reductions for two manure treatment technologies.
abstract: The effect of two dairy manure treatments, solid-liquid separation (SLS) and anaerobic digestion (AD), on methane potential and the speed of production was evaluated. Assays were performed in the lab to measure methane (CH4) production over 202 d from dairy manure samples taken before and after each treatment. Compared to raw manure, CH4emissions on a per-L basis were reduced 81% by SLS and 59% by AD, on average. The mean (SD) ultimate CH4emission potential (B0) per kg of volatile solids (VS) was 247 (8) L CH4kg-1VS for raw manure, 221 (9) L CH4kg-1VS for separated liquid, and 160 (4) L CH4kg-1VS for anaerobic digestate. Thus, SLS reduced the B0of the liquid fraction by 11% and AD reduced B0by up to 35% compared to raw manure. Manure treatment affected the speed of CH4production: SLS increased the CH4production rate and thus separated liquid manure was the fastest to produce 90% of the ultimate CH4production. Therefore, both the speed of degradation and B0should be considered when assessing these techniques for farm-scale manure storages, because actual emission reductions will depend on storage conditions.
authors.affiliation: a Ottawa Research and Development Centre , Agriculture and Agri-Food Canada , Ottawa , Canada.
authors.forename: Andrew C
authors.identifier: http://orcid.org/0000-0003-1912-898X
authors.initials: AC
authors.lastname: VanderZaag
authors.affiliation: a Ottawa Research and Development Centre , Agriculture and Agri-Food Canada , Ottawa , Canada.
authors.forename: Hambaliou
authors.initials: H
authors.lastname: Baldé
authors.affiliation: b Ontario Rural Wastewater Centre , University of Guelph , Alfred , Canada.
authors.forename: Anna
authors.initials: A
authors.lastname: Crolla
authors.affiliation: c Department of Geography and Environmental Studies , Wilfrid Laurier University , Waterloo , Canada.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Gordon
authors.affiliation: a Ottawa Research and Development Centre , Agriculture and Agri-Food Canada , Ottawa , Canada.|d Department of Agricultural and Environmental Engineering , The University of Bamenda , Bamenda , Cameroon.
authors.forename: N Martin
authors.initials: NM
authors.lastname: Ngwabie
authors.affiliation: e School of Environmental Sciences , University of Guelph , Guelph , Canada.
authors.forename: Claudia
authors.initials: C
authors.lastname: Wagner-Riddle
authors.affiliation: a Ottawa Research and Development Centre , Agriculture and Agri-Food Canada , Ottawa , Canada.
authors.forename: Ray
authors.initials: R
authors.lastname: Desjardins
authors.affiliation: f Environment Canada , Gatineau , Canada.
authors.forename: J Douglas
authors.initials: JD
authors.lastname: MacDonald
mesh_terms: D000693:Anaerobiosis; D000072480:Farms; D008372:Manure; D008697:Methane / Q000032:analysis*; D018505:Waste Management
chemical_list: D008372:Manure; D008697:Methane
keywords: Dairy manure treatment; anaerobic digestion; biochemical methane potential test; maximum methane production rate; solid–liquid separation