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Synergistic effect from anaerobic co-digestion of food waste and Sophora flavescens residues at different co-substrate ratios
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Synergistic effect from anaerobic co-digestion of food waste and Sophora flavescens residues at different co-substrate ratios
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Journal Article
Synergistic effect from anaerobic co-digestion of food waste and Sophora flavescens residues at different co-substrate ratios
2019
Overview
When food waste (FW) undergoes anaerobic digestion, the hydrolysis rate is rapid, and thus causes system instability.
Sophora flavescens
residues (SFRs) are rich in complex hydrolysed substances, such as lignocellulosic material. When combined FW and SFRs can effectively improve the stability of digestion systems and increase biogas yields. In this work, batch anaerobic experiments were conducted at different co-substrate ratios to investigate the performance of co-digestion and the synergistic effect of FW and SFRs. The co-digestion of the two substrates exerted synergistic effects on biogas production and the highest synergy was 120.8%. After digestion, the ratio of hydrolysed chemical oxygen demand (COD) to the entire COD (RCOD
H
) of the co-digestion group was 1.08 times that of the single FW group, which indicated the co-digestion promoted the hydrolysis of substrates. Moreover, the hydrolysis rate constant (
k
h
) of co-digestion group increased by 4.10 times in comparison with that of the single FW group, which indicated the co-digestion increased the hydrolysis rate. In other words, the synergistic effect mainly occurred in the hydrolysis acidification process.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
