Abstract
This article aims to study the codigestion of food waste (FW) and three different lignocellulosic wastes (LW) (Corn stover (CS), Prairie cordgrass (PCG), and Unbleached paper (UBP)) for thermophilic anaerobic digestion to overcome the limitations of digesting food waste alone (volatile fatty acids accumulation and low C:N ratio). Using an enriched thermophilic methanogenic consortium, all the food and lignocellulosic waste mixtures showed positive synergistic effects of codigestion. After 30 days of incubation at 60 °C (100 rpm), the highest methane yield of 305.45 L·kg−1 volatile solids (VS) was achieved with a combination of FW-PCG-CS followed by 279.31 L·kg−1 VS with a mixture of FW-PCG. The corresponding volatile solids reduction for these two co-digestion mixtures was 68% and 58%, respectively. This study demonstrated a reduced hydraulic retention time for methane production using FW and LW.
Highlights
Anaerobic digestion for the production of biogas is an environmentally friendly multi-step process employing complex consortia of microorganisms
total solids (TS) and volatile solids (VS) contents of the three lignocellulosic wastes (LW) (CS, prairie cord grass (PCG), unbleached paper (UBP)) were higher than that of food waste (FW), and their VS/TS ratios were between 85% to 95% making them suitable feedstocks for Thermophilic anaerobic digestion (TAD) (Table 1)
Biogas production using the abundant wastes as the substrate is a promising technology both in Methane yield (L·kg−1 VS) 159.8 ± 2.4 251.9 ± 26.6 renewable energy and 44 solid management sectors
Summary
Anaerobic digestion for the production of biogas is an environmentally friendly multi-step process employing complex consortia of microorganisms. These consortia comprise various facultative or obligate anaerobic microbial groups which work synergistically and convert complex organic substrates into biogas. After the on-site demand of the produced biogas is met, the remaining biogas is usually stored as compressed natural gas (CNG) or liquefied biomethane (LBM) for future use. While the biogas industry in Europe is well established, with more than 10,000 biogas producing Anaerobic digestion (AD) plants in operation, in the United States, the biogas industry is still growing. According to the American Biogas Council, 1241 wastewater treatment plants and 236 farms have functional
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