Abstract
Biogas production in the cold regions of China is hindered by low temperatures, which led to slow lignocellulose biotransformation. Cold-adapted lignocellulose degrading microbial complex community LTF-27 was used to investigate the influence of hydrolysis on biogas production. After 5days of hydrolysis at 15 ± 1°C, the hydrolysis conversion rate of the corn straw went up to 22.64%, and the concentration of acetic acid increased to 2596.56mg/L. The methane production rates of total solids (TS) inoculated by LTF-27 reached 204.72mL/g, which was higher than the biogas (161.34mL/g), and the control group (CK) inoculated with cultural solution (121.19mL/g), the methane production rate of volatile solids (VS) increased by 26.88% and 68.92%, respectively. Parabacteroides, Lysinibacillus, and Citrobacter were the main organisms that were responsible for hydrolysis. While numerous other bacteria genera in the gas-producing phase, Macellibacteroides were the most commonly occurring one. Methanosarcina and Methanobacteriaceae contributed 86.25% and 11.80% of the total Archaea abundance during this phase. This study proves the psychrotrophic LTF-27's applicability in hydrolysis and biomass gas production in low temperatures.
Highlights
In recent years, due to the excessive development and the fast depletion of fossil fuel reserves, the corresponding environmental pollution has become a serious and irreversible environmental problem (Mei et al 2017)
The methane production rates of total solid content (TS) inoculated by LTF-27 reached 204.72 ml/g, which was higher than the biogas (161.34 ml/g), and the CK (121.19 ml/g), the methane production rate of volatile solids content (VS) increased by 26.88% and 68.92%, respectively
The degradation rates of cellulose and hemicellulose were 15.31% and 18.63%, respectively, which were lower than the degradation rate of the test group using the composite strain LTF-27
Summary
Due to the excessive development and the fast depletion of fossil fuel reserves, the corresponding environmental pollution has become a serious and irreversible environmental problem (Mei et al 2017). Anaerobic digestion (AD) plays a important role in sustainable development by transforming organic wastes into green energy (Peu et al 2017). Especially biogas produced through the AD of renewable feedstock, is considered one of the up-and-coming alternatives to fossil-derived energy due to several inherent and significant merits (Cheng et al 2011; Kaparaju et al 2009). As an efficient process for CS treatment, biogas AD has excellent potential for application prospects. It could effectively degrade CS and reduced its impact on the environment. Compared to the aerobic fermentation treatment process, the construction and design cost of the AD treatment process was lower, and the energy consumption was relatively lower (Zhang et al 2018)
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