Abstract
Sugar beet by-products are a lignocellulosic waste generated from sugar beet industry during the sugar production process and stand out for their high carbon content. Moreover, cow manure (CM) is hugely produced in rural areas and livestock industry, which requires proper disposal. Anaerobic digestion of such organic wastes has shown to be a suitable technology for these wastes valorization and bioenergy production. In this context, the biomethane production from the anaerobic co-digestion of exhausted sugar beet pulp (ESBP) and CM was investigated in this study. Four mixtures (0:100, 50:50, 75:25, and 90:10) of cow manure and sugar beet by-products were evaluated for methane generation by thermophilic batch anaerobic co-digestion assays. The results showed the highest methane production was observed in mixtures with 75% of CM (159.5 mL CH4/g VolatileSolids added). Nevertheless, the hydrolysis was inhibited by volatile fatty acids accumulation in the 0:100 mixture, which refers to the assay without CM addition. The modified Gompertz model was used to fit the experimental results of methane productions and the results of the modeling show a good fit between the estimated and the observed data.
Highlights
Anaerobic co-digestion (AcoD) of lignocellulosic biomass and animal manure to produce biogas has gained increasing recognition over the years thanks to the synergy produced between this type of wastes, creating a positive energy balance, which leads to a high yield of biogas and elimination of organic matter
Zhao et al [3], reported that anaerobic digestion (AD) of agro-industrial waste could lead to an inhibition of the process due to its high carbon content since volatile fatty acids (VFA) are derived from organic carbon
The objective of this study is to evaluate the effect of cow manure as co-substrate in the thermophilic anaerobic co-digestion with exhausted sugar beet pulp at four different mixtures
Summary
Anaerobic co-digestion (AcoD) of lignocellulosic biomass and animal manure to produce biogas has gained increasing recognition over the years thanks to the synergy produced between this type of wastes, creating a positive energy balance, which leads to a high yield of biogas and elimination of organic matter. AcoD can be considered as an improvement of the AD due to several considerations such as the optimization in the nutritional balance of the microorganisms in the system, the maintenance of a resistant microbial mixture in the reactor, the balance between the four phases of the AD process, and the improvement of the biomass biodegradability [4]. All these aspects are directly influenced by the characteristics of the co-substrates used
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