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Effect of Fe2+ adding period on the biogas production and microbial community distribution during the dry anaerobic digestion process
Process Safety and Environmental Protection ( IF 4.384 ) Pub Date : 2020-01-11 , DOI: 10.1016/j.psep.2019.12.031
Shaona Wang; Rongfang Yuan; Chengchen Liu; Beihai Zhou

Fe2+ is essential for the improvement of biogas production and the growth of anaerobic microorganisms; however, it is often excessively added to anaerobic digesters, leading to the inhibition of biogas production. In this study, the dosing frequency of Fe2+ for the mesophilic and thermophilic biogas fermentation of high-solid swine manure was optimized. The most significant enhancing effect (13.44%-33.22%) induced by Fe2+ addition was observed with dosing frequency of 400 mg/L for every 5 d, and the maximum efficiency for unit concentration of Fe2+ occurred when the dosing frequency was 400 mg/L for every 15 d. Maximum biogas production was obtained in the group with dosing frequency of 400 mg/L for every 5 d, and biogas production potential was 465.24 mL/(g volatile solid (VS)) based on modified Gompertz predicted model with a maximum rate of 16.72 mL/(gVS·d), which was higher than that of the control group (6.78 mL/(gVS·d)). In addition, Fe2+ dosing displayed a stimulatory effect on SCOD removal, the SCOD removal with dosing frequency of 400 mg/L for every 5 d were highest in all reactors. The optimum dosing frequency of Fe2+ positively affected the microbial community structure. 16S rRNA gene sequencing revealed that the abundances of Firmicutes and Euryarchaeota were increased, which could enhance the hydrolysis-acidification and methanogenesis process during anaerobic digestion process.
更新日期:2020-01-13

 

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