title: Optimization of a landfill gas collection shutdown based on an adapted first-order decay model.
abstract: LandGEM's equation was reformulated to include two types of refuse, fast decaying refuse (FDR) and slow decaying refuse (SDR), whose fractions and key modeling parameters k and L0were optimized independently for three periods in the life of the Montreal-CESM landfill. Three scenarios were analyzed and compared to actual biogas collection data: (1) Two-Variable Scenario, where k and L0were optimized for a single type of refuse; (2) Six-Variable Scenario, where three sets of k and L0were optimized for the three periods and for a single type of refuse; and (3) Seven-Variable Scenario, whereby optimization was performed for two sets of k and L0, one associated with FDR and the second with SDR, and for the fraction of FDR during each of the three periods. Results showed that the lowest error from the error minimization technique was obtained with the Six-Variable Scenario. However, this scenario's estimation of gas generation was found to be rather unlikely. The Seven-Variable Scenario, which allowed for considerations about changes in landfilling trends, offered a more reliable prediction tool for landfill gas generation and optimal shutdown time of the biogas collection system, when the minimum technological threshold would be attained. The methodology could potentially be applied mutatis mutandis to other landfills, by considering their specific waste disposal and gas collection histories.
authors.affiliation: Biothermica Technologies Inc., Montreal, QC, Canada. Electronic address: daniel.lagos@usherbrooke.ca.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Lagos
authors.affiliation: City of Montreal, Montreal, QC, Canada. Electronic address: mheroux@ville.montreal.qc.ca.
authors.forename: Martin
authors.initials: M
authors.lastname: Héroux
authors.affiliation: Department of Chemical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada. Electronic address: ryan.gosselin@usherbrooke.ca.
authors.forename: Ryan
authors.initials: R
authors.lastname: Gosselin
authors.affiliation: Department of Civil Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada. Electronic address: alexandre.cabral@usherbrooke.ca.
authors.forename: Alexandre R
authors.initials: AR
authors.lastname: Cabral
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring; D008697:Methane / Q000032:analysis; D008962:Models, Theoretical; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste; D064091:Waste Disposal Facilities
chemical_list: D000393:Air Pollutants; D062611:Solid Waste; D008697:Methane
keywords: Fast-decaying refuse; First-order decay model; IPCC model; LandGEM; Landfill gas collection; Slow-decaying refuse