Effects of trace elemens Fe2+, Co2+, Ni2+ on ananrobic digestion of wheat straw and chicken manure

In this work, the effects of trace elements (Fe2+, Co2+, Ni2+) on anaerobic co-digestion of wheat straw and chicken manure were investigated by Batch experiments. The results show that the optimum concentrations of Fe2+, Co2+ and Ni2+ are 210, 32 and 32 mg/L respectively.The methane yield and CODs removal can be significantly (p2+, Co2+, Ni2+). When under optimal condition of Fe2+=210 mg/L, Co2+=32 mg/L, and Ni2+=32 mg/L, the methane yield are 322.21, 331.19 and 357.10 mL/(g•VS) respectively, which is increased significantly (p2+> Co2+> Fe2+. The highest cumulative methane yield and the highest CODs removal are recorded by Ni2+. The pH of all experiments are stable within the appropriate range during anaerobic digestion. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.