Effect of biochar-loaded sodium anthraquinone-2-sulfonate on anaerobic digestion
ZHANG Yu-lei1,2, MA Jun-yi2, AI Ping1, ZHAO Li-xin2, YAO Zong-lu2, YU Jia-dong2, LIANG Yi2
1. College of Engineering, Huazhong Agricultural University, Wuhan 430072, China; 2. Key Laboratory of Green and Low Carbon Agriculture in North China Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Abstract：In order to improve the efficiency of anaerobic digestion system, biochar (BC) was used as a carrier of anthraquinone-2-sulfonate (AQS) for the preparation of composite mediator (BC/AQS) that can be applied in anaerobic digestion system. The batch anaerobic digestion experiment was carried out at mesophilic condition (35℃) to explore the effect of BC/AQS on anaerobic digestion of corn straw. The results showed that when the AQS loading concentration was 1mmol/L, BC/AQS performed best in enhancing methane production efficiency. On this condition, the maximum methane production rate (Rmax) reached 10.64mL/(d·g), the maximum cumulative methane production (Pmax) reached 240.41mL/g, and the cumulative methane production per unit volatile solid (VS) respectively increased by 20.60% and 12.11% compared to the control and treatment solely added BC (P<0.05). The archaea enriched by BC/AQS were Methanosarcina and Methanofollis. In addition, BC/AQS promoted the generation of volatile fatty acids (VFAs) in the early stage of digestion, resulting in an increase of 7.73% to 18.54% in total VFAs concentration onday 10 compared with the control. In the middle and later stages, BC/AQS promoted the degradation of VFAs. BC/AQS-1mmol/L induced the largest decrease in total VFAs concentration, with a decrease of 77.43%. The potential mechanism may be BC/AQS increased the abundance of hydrolytic acid-producing bacteria including Ruminofilibacter, Proteiniphilum, Fermentimonas and Acinetobacter.
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