Impact of Fe and Ni Addition on the VFAs’ Generation and Process Stability of Anaerobic Fermentation Containing Cd

Huayong Zhang, Yanli Xu, Yonglan Tian, Lei Zheng, He Hao and Hai Huang
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Huayong Zhang: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Yanli Xu: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Yonglan Tian: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Lei Zheng: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
He Hao: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Hai Huang: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China

IJERPH, 2019, vol. 16, issue 21, 1-16

Abstract: The effects of Cd, Cd + Fe, and Cd + Ni on the thermophilic anaerobic fermentation of corn stover and cow manure were studied in pilot experiments by investigating the biogas properties, process stability, substrate biodegradation, and microbial properties. The results showed that the addition of Fe and Ni into the Cd-containing fermentation system induced higher cumulative biogas yields and NH 4 + –N concentrations compared with the only Cd-added group. Ni together with Cd improved and brought forward the peak daily biogas yields, and increased the CH 4 contents to 80.76%. Taking the whole fermentation process into consideration, the promoting impact of the Cd + Ni group was mainly attributed to better process stability, a higher average NH 4 + –N concentration, and increased utilization of acetate. Adding Fe into the Cd-containing fermentation system increased the absolute abundance of Methanobrevibacter on the 13th day, and Methanobrevibacter and Methanobacterium were found to be positively correlated with the daily biogas yield. This research was expected to provide a basis for the reuse of biological wastes contaminated by heavy metals and a reference for further studies on the influence of compound heavy metals on anaerobic fermentation.

Keywords: compound heavy metals; anaerobic fermentation; biogas properties; process stability; substrate biodegradation; microbial properties (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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