title: Aerobic composting of digested residue eluted from dry methane fermentation to develop a zero-emission process.
abstract: Digested residue remained at the end of a process for the production of fuel ethanol and methane from kitchen garbage. To develop a zero-emission process, the compostability of the digested residue was assessed to obtain an added-value fertilizer. Composting of the digested residue by adding matured compost and a bulking agent was performed using a lab-scale composting reactor. The composting process showed that volatile total solid (VTS) degradation mainly occurred during the first 13days, and the highest VTS degradation efficiency was about 27% at the end. The raw material was not suitable as a fertilizer due to its high NH4+and volatile fatty acids (VFAs) concentration. However, the composting process produced remarkable results; the physicochemical properties indicated that highly matured compost was obtained within 62days of the composting process, and the final N concentration, NO3-concentration, and the germination index (GI) at the end of the composting process was 16.4gkg-1-TS, 9.7gkg-1-TS, and 151%, respectively. Real-time quantitative PCR (qPCR) analysis of ammonia oxidizers indicated that the occurrence of nitrification during the composting of digested residue was attributed to the activity of ammonia-oxidizing bacteria (AOB).
authors.affiliation: College of Architecture and Environment, Sichuan University, No. 24 South Section 1, First Ring Road, Chengdu, Sichuan 610065, China.
authors.forename: Yu-Lian
authors.initials: YL
authors.lastname: Huang
authors.affiliation: College of Architecture and Environment, Sichuan University, No. 24 South Section 1, First Ring Road, Chengdu, Sichuan 610065, China. Electronic address: szy@scu.edu.cn.
authors.forename: Zhao-Yong
authors.initials: ZY
authors.lastname: Sun
authors.affiliation: College of Architecture and Environment, Sichuan University, No. 24 South Section 1, First Ring Road, Chengdu, Sichuan 610065, China.
authors.forename: Xiao-Zhong
authors.initials: XZ
authors.lastname: Zhong
authors.affiliation: College of Architecture and Environment, Sichuan University, No. 24 South Section 1, First Ring Road, Chengdu, Sichuan 610065, China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Wang
authors.affiliation: College of Architecture and Environment, Sichuan University, No. 24 South Section 1, First Ring Road, Chengdu, Sichuan 610065, China.
authors.forename: Li
authors.initials: L
authors.lastname: Tan
authors.affiliation: College of Architecture and Environment, Sichuan University, No. 24 South Section 1, First Ring Road, Chengdu, Sichuan 610065, China.
authors.forename: Yue-Qin
authors.initials: YQ
authors.lastname: Tang
authors.affiliation: College of Architecture and Environment, Sichuan University, No. 24 South Section 1, First Ring Road, Chengdu, Sichuan 610065, China.
authors.forename: Kenji
authors.initials: K
authors.lastname: Kida
mesh_terms: D000332:Aerobiosis; D000641:Ammonia / Q000378:metabolism; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005285:Fermentation; D005308:Fertilizers; D008697:Methane / Q000096:biosynthesis*; D059013:Microbial Consortia / Q000235:genetics / Q000502:physiology; D009566:Nitrates / Q000378:metabolism; D058465:Nitrification; D060888:Real-Time Polymerase Chain Reaction; D012987:Soil; D012988:Soil Microbiology; D013696:Temperature; D014866:Waste Products
chemical_list: D005232:Fatty Acids, Volatile; D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D014866:Waste Products; D000641:Ammonia; D008697:Methane
keywords: Ammonia oxidizer; Composting; Digested residue; Fertilizer; Nitrification