title: Co-digestion of polylactide and kitchen garbage in hyperthermophilic and thermophilic continuous anaerobic process.
abstract: Two series of two-phase anaerobic systems, consisting of a hyperthermophilic (80°C) reactor and a thermophilic (55°C) reactor, fed with a mixture of kitchen garbage (KG) and polylactide (PLA), was compared with a single-phase thermophilic reactor for the overall performance. The result indicated that ammonia addition under hyperthermophilic condition promoted the transformation of PLA particles to lactic acid. The systems with hyperthermophilic treatment had advantages on PLA transformation and methane conversion ratio to the control system. Under the organic loading rate (OLR) of 10.3 g COD/(L day), the PLA transformation ratios of the two-phase systems were 82.0% and 85.2%, respectively, higher than that of the control system (63.5%). The methane conversion ratios of the two-phase systems were 82.9% and 80.8%, respectively, higher than 70.1% of the control system. The microbial community analysis indicated that hyperthermophilic treatment is easily installed to traditional thermophilic anaerobic digestion plants without inoculation of special bacteria.
authors.affiliation: Department of Environmental Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan. wang.feng.7s@kyoto-u.ac.jp
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Taira
authors.initials: T
authors.lastname: Hidaka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tsuno
authors.forename: Jun
authors.initials: J
authors.lastname: Tsubota
mesh_terms: D000641:Ammonia / Q000494:pharmacology; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005735:Garbage; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis; D011091:Polyesters / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology; D013696:Temperature; D014867:Water
chemical_list: D011091:Polyesters; D012722:Sewage; D014867:Water; C033616:poly(lactide); D000641:Ammonia; D008697:Methane