Cadmium Addition Effects on Anaerobic Digestion with Elevated Temperatures

Yonglan Tian, Shusen Li, Ying Li, Huayong Zhang, Xueyue Mi and Hai Huang
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Yonglan Tian: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Shusen Li: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Ying Li: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Huayong Zhang: Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
Xueyue Mi: 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

Energies, 2019, vol. 12, issue 12, 1-11

Abstract: Anaerobic fermentation with biogas as an energy source is influenced by the presence of heavy metals. However, the availability of the heavy metals is dependent on the digestion temperature. In this study, the impacts of Cd on the characteristics of biogas, substrate biodegradation, and enzyme activity during anaerobic co-digestion were investigated under varying digestion temperatures. The results showed that 1 mg/L initial Cd concentration improved cumulative biogas yields by 404.96%, 16.93%, and 5.56% at 55 °C, 45 °C, and 35 °C, respectively. In contrast, at low temperatures (25 °C), the yield decreased by 0.77%. In the 55 °C group, Cd addition improved the activity of cellulase ( p < 0.05) and coenzyme F 420 ( p < 0.01). The total chemical oxygen demand (COD) during the peak period and the transformation of hydrolytic organic components into volatile fatty acids (VFAs) influenced the CH 4 and biogas yields. There were no significant differences in cellulase, dehydrogenase, and coenzyme F 420 activities with or without Cd addition when the digestion temperature was 45 °C, 35 °C, and 25 °C. Therefore, thermophilic digestion is recommended for the efficient degradation of Cd-contaminated biowaste. Moreover, the impact of metals on the performance of anaerobic digestion should be considered together with temperature conditions in future research and practice.

Keywords: cadmium; CH 4 production; substrate biodegradation; enzyme (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (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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