Anaerobic digestion of extracts from steam exploded Agave tequilana bagasse. (1st September 2019)

• Record Type: Journal Article
• Authors: Weber, Bernd; Estrada-Maya, Andrea; Sandoval-Moctezuma, Andrea C.; Martínez-Cienfuegos, Iván G.
• Is Part Of: Journal of environmental management. Volume 245(2019)
• Page Start: 489
• Page End: 495
• Publication Date: 2019-09-01
• Subjects: Thermal pretreatment -- Biogas -- Semisolid waste -- Lignocellulosic biomass -- Biorefinery; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2019.05.093
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Anaerobic digestion (AD) in the beverage industry is a proven treatment technology. But adding dissolved organic matter to AD can increase the on-site output of renewable energy. In the tequila industry such waste-derived organic matter can be obtained from semisolid agave bagasse submitted to steam explosion as pretreatment. Vapor at pressure <1.0 MPa is commonly available so that steam explosion can be integrated into extant production schemes. This study investigates the efficiency of agave bagasse hydrolyzation via steam explosion (applying severity factors between 2.4 and 3.7 with 0.98 MPa maximum pressure) as well as the efficiency of the bio-conversion in anaerobic batch assays. The best steam explosion yield was 14.3 ± 0.1 gCOD 100 g −1 (0.98 MPa vapor pressure during 22 min followed by fast pressure release). The average biochemical methane potential (BMP) was 290 mLN gCOD -1 with 74% of the biogas released within seven days. Graphical abstract: Image 1 Highlights: Steam explosion of agave bagasse with severity factor of 3.6 is effective. Steam explosion transfers 0.143 kgCOD per kg bagasse into drained liquid phase. Methane potential of hydrolysate obtained by steam explosion is 290 mL gCOD −1 . 89% of COD removal in BMP test. Energy recovery of 1.44 MJ per kg bagasse is feasible with proposed technology.