Biogas production from anaerobic co-digestion of agroindustrial wastewaters under mesophilic conditions in a two-stage process

摘要: Abstract Co-digestion of organic wastes is a technology that increasingly being applied for simultaneous treatment several solid and liquid wastes, in which the content nutrients can thereby be balanced, negative effect toxic compounds on digestion process may decreased giving an increased gas yield from biomass. Moreover, co-digestion contribute to more efficient use anaerobic (AD) reactors cost-sharing by processing multiple waste streams single facility. In this study, biodegradation mixture containing olive mill wastewater (OMW), cow manure (LCM) cheese whey (CW) using two-stage was examined. Two continuously stirred tank (CSTRs) were used under mesophilic conditions (35°C) order enhance acidogenesis methanogenesis. The overall designed with hydraulic retention time (HRT) 19 days. acidogenic reactor initially fed influent composed 55% OMW, 40% CW 5% LCM. After 87th day operation, changed 90% 10% LCM based actual availability produced respective agroindustries. average removal dissolved chemical oxygen demand (COD) 75.5% 85.2% two examined scenarios at OLR 5.5 ± 0.36 4.5 0.30 g total COD/Lreactor/d, while methane production rate steady state reached 1.35 0.11 1.33 0.15 L CH 4 /Lreactor/day respectively.