title: Degradation characteristics of polylactide in thermophilic anaerobic digestion with hyperthermophilic solubilization condition.
abstract: To test whether hyperthermophilic treatment promotes polylactide (PLA) dissolution and methane conversion under anaerobic digestion conditions, a single thermophilic control reactor (55 °C) and a two-phase system consisting of a hyperthermophilic reactor (80 °C) and a thermophilic reactor (55 °C) were continuously fed with a mixture of PLA and artificial kitchen garbage. In Runs 1 and 2, the PLA dissolution ratios in the two-phase system were 79.2 ± 6.5% and 85.2 ± 7.0%, respectively, higher than those of the control. Batch experimental results indicated that hyperthermophilic treatment could promote PLA dissolution to a greater degree as compared with single thermophilic treatment and that ammonia addition also had a promotional effect on PLA dissolution. In the two-phase system, after hyperthermophilic treatment, dissolved PLA was converted to methane gas under the subsequent thermophilic condition.
authors.affiliation: Department of Urban and Environmental Engineering, Kyoto University, Kyoto, Japan. wang.f@ay2.ecs.kyoto-u.ac.jp
authors.forename: F
authors.initials: F
authors.lastname: Wang
authors.forename: T
authors.initials: T
authors.lastname: Hidaka
authors.forename: T
authors.initials: T
authors.lastname: Oishi
authors.forename: S
authors.initials: S
authors.lastname: Osumi
authors.forename: J
authors.initials: J
authors.lastname: Tsubota
authors.forename: H
authors.initials: H
authors.lastname: Tsuno
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D005285:Fermentation; D006358:Hot Temperature; D008697:Methane / Q000737:chemistry / Q000378:metabolism; D011091:Polyesters / Q000737:chemistry* / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism
chemical_list: D011091:Polyesters; D014874:Water Pollutants, Chemical; C033616:poly(lactide); D008697:Methane