title: Enhanced volatile fatty acids production during anaerobic digestion of lignocellulosic biomass via micro-oxygenation.
abstract: A series of batch experiments were conducted to investigate the effects of inoculum type, oxygen (O2) dosage, and incubation time on volatile fatty acids (VFAs) production during anaerobic digestion (AD) of Napier grass (Pennisetum purpureum), a high yielding energy crop. The results showed that anaerobically digested cattle manure (ADCM) as an inoculum generated significantly higher VFAs compared to that of anaerobically digested waste activated sludge (ADWAS) as an inoculum. Additionally, the incubation time of 3days and O2dosage of 15mL/g volatile solidsaddedshowed the highest VFAs production when ADCM was used as an inoculum. Moreover, the VFAs production had a quadratic correlation with O2dosage with R2of 0.86. The Scanning Electron Microscopy (SEM) images of the digested fiber showed rough and crumbled surface structures as opposed to that of the undigested fiber, which was further confirmed by changes in structural composition of the digested fiber.
authors.affiliation: Department of Molecular Biosciences and Bioengineering (MBBE), University of Hawai'i at Mānoa, 1955 East-West Road, Agricultural Science Building 218, Honolulu, HI 96822, USA.
authors.forename: Chayanon
authors.initials: C
authors.lastname: Sawatdeenarunat
authors.affiliation: College of Agriculture, Forestry and Natural Resource Management (CAFNRM), University of Hawai'i at Hilo, 200 W. Kawili Street, Hilo, HI 96720, USA.
authors.forename: Shihwu
authors.initials: S
authors.lastname: Sung
authors.affiliation: Department of Molecular Biosciences and Bioengineering (MBBE), University of Hawai'i at Mānoa, 1955 East-West Road, Agricultural Science Building 218, Honolulu, HI 96822, USA. Electronic address: khanal@hawaii.edu.
authors.forename: Samir Kumar
authors.initials: SK
authors.lastname: Khanal
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D018533:Biomass; D002417:Cattle; D005232:Fatty Acids, Volatile; D005285:Fermentation; D012722:Sewage
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage
keywords: Anaerobic digestion; Energy crop; Lignocellulosic biomass; Micro-oxygenation; Volatile fatty acids