title: Enhancement on biodegradation and anaerobic digestion efficiency of activated sludge using a dual irradiation process.
abstract: A dual irradiation process involving aerobic thermophilic irradiation pretreatment (ATIP) and intermittent irradiation anaerobic digestion was developed to improve the digestion of waste-activated sludge. First, the effect of ATIP on further anaerobic digestion of activated sludge in batch mode was investigated. When exposed to ATIP for 24 h, the digestion reactor gave the highest methane yield, removed the most dissolved organic carbon (DOC) and showed the most effective reduction of VS compared to other irradiation times. This process was further enhanced by using an anaerobic fluidised-bed reactor packed with carbon felt in semi-continuous mode for digesting the pretreated activated sludge under intermittent irradiation conditions. Dual irradiation for 24 h followed by 60 min of anaerobic irradiation processing per day turned out to be optimal. This resulted in 65.3% of VS reduction, 83.9% of DOC removal ratio and 538 ml/g-VS of methane yield.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Ibaraki, Tsukuba 305-8572, Japan. yo.innan.fu@tsukuba.co.jp
authors.forename: Yingnan
authors.initials: Y
authors.lastname: Yang
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Tsukahara
authors.forename: Rongyong
authors.initials: R
authors.lastname: Yang
authors.forename: Zhenya
authors.initials: Z
authors.lastname: Zhang
authors.forename: Shigeki
authors.initials: S
authors.lastname: Sawayama
mesh_terms: D000693:Anaerobiosis / Q000528:radiation effects; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental; D018441:Biofilms / Q000528:radiation effects; D002244:Carbon / Q000032:analysis; D052918:Environmental Restoration and Remediation / Q000379:methods*; D008027:Light; D009930:Organic Chemicals / Q000032:analysis; D058433:Photobioreactors / Q000382:microbiology; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid; D018508:Water Purification
chemical_list: D009930:Organic Chemicals; D012722:Sewage; D002244:Carbon