title: Emission of oxygenated volatile organic compounds (OVOCs) during the aerobic decomposition of orange wastes.
abstract: Oxygenated volatile organic compounds (OVOCs) emitted from orange wastes during aerobic decomposition were investigated in a laboratory-controlled incubator for a period of two months. Emission of total OVOCs (TOVOCs) from orange wastes reached 1714 mg/dry kg (330 mg/wet kg). Ethanol, methanol, ethyl acetate, methyl acetate, 2-butanone and acetaldehyde were the most abundant OVOC species with shares of 26.9%, 24.8%, 20.3%, 13.9%, 2.8% and 2.5%, respectively, in the TOVOCs released. The emission fluxes of the above top five OVOCs were quite trivial in the beginning but increased sharply to form one "peak emission window" with maximums at days 1-8 until leveling off after 10 days. This type of "peak emission window" was synchronized with the CO2 fluxes and incubation temperature of the orange wastes, indicating that released OVOCs were mainly derived from secondary metabolites of orange substrates through biotic processes rather than abiotic processes or primary volatilization of the inherent pool in oranges. Acetaldehyde instead had emission fluxes decreasing sharply from its initial maximum to nearly zero in about four days, suggesting that it was inherent rather than secondarily formed. For TOVOCs or all OVOC species except 2-butanone and acetone, over 80% of their emissions occurred during the first week, implying that organic wastes might give off a considerable amount of OVOCs during the early disposal period under aerobic conditions.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; College of Environmental Sciences and Engineering, Anhui Normal University, Wuhu 241003, China. Electronic address: wuting19@mail.ahnu.edu.cn.
authors.forename: Ting
authors.initials: T
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. Electronic address: wangxm@gig.ac.cn.
authors.forename: Xinming
authors.initials: X
authors.lastname: Wang
mesh_terms: D000332:Aerobiosis; D019149:Bioreactors; D002957:Citrus; D007220:Industrial Waste; D010100:Oxygen / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods; D062611:Solid Waste / Q000032:analysis*; D055549:Volatile Organic Compounds / Q000737:chemistry*
chemical_list: D007220:Industrial Waste; D062611:Solid Waste; D055549:Volatile Organic Compounds; D010100:Oxygen
keywords: Aerobic decomposition; Emission fluxes; Orange wastes; Oxygenated volatile organic compounds (OVOCs)