Enhanced volatile fatty acids production during anaerobic digestion of lignocellulosic biomass via micro-oxygenation. (August 2017)

• Record Type: Journal Article
• Authors: Sawatdeenarunat, Chayanon; Sung, Shihwu; Khanal, Samir Kumar
• Is Part Of: Bioresource technology. Volume 237(2017)
• Page Start: 139
• Page End: 145
• Publication Date: 2017-08
• Subjects: Micro-oxygenation -- Volatile fatty acids -- Anaerobic digestion -- Lignocellulosic biomass -- Energy crop; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.02.029
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The effects of micro-oxygenation on volatile fatty acids (VFAs) production during anaerobic digestion was studied. Inoculum type, incubation time, and oxygen dosage showed significant interactions. Anaerobically digested cattle manure (ADCM) was the ideal inoculum for VFAs production. VFAs yield showed a quadratic correlation with oxygen dosage. 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 3 days and O2 dosage of 15 mL/g volatile solidsadded showed the highest VFAs production when ADCM was used as an inoculum. Moreover, the VFAs production had a quadratic correlation with O2 dosage with R 2 of 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.