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Process Analysis of Anaerobic Fermentation Exposure to Metal Mixtures
Yonglan Tian1, Huayong Zhang2, Lei Zheng1
1Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China.
Summary
Adding specific metals like iron, nickel, and zinc to copper-stressed anaerobic fermentation systems boosts biogas production and methane content. These metal mixtures also enhance process stability and microbial activity for effective biowaste treatment.
Area of Science:
- Environmental Microbiology
- Biotechnology
- Waste Management
Background:
- Anaerobic fermentation is an economical method for biowaste disposal.
- Microorganisms in fermentation require trace metals for optimal function.
- Heavy metal contamination can inhibit anaerobic digestion processes.
Purpose of the Study:
- To investigate the impact of metal mixtures (Fe, Ni, Zn) on anaerobic fermentation performance in a copper-stressed system.
- To analyze effects on biogas yield, process stability, substrate degradation, enzyme activity, and microbial communities.
- To assess the potential for utilizing heavy metal-contaminated biowaste.
Main Methods:
- Anaerobic fermentation experiments were conducted using biowaste.
- Specific metal mixtures (Fe, Ni, Zn) were added to a copper-stressed system.
- Biogas production, chemical parameters (NH4+-N), enzyme activity (Coenzyme F420), and microbial community composition were analyzed.
Main Results:
- Addition of Fe, Ni, and Zn increased cumulative biogas yields and coenzyme F420 activity.
- Ni and Zn enhanced process stability, acetate utilization, and methane (CH4) content, reaching up to 88.94%.
- Zn addition improved the abundance of key bacteria (Defluviitoga, Fibrobacter) and archaea (Methanothermobacter), enhancing cellulose degradation and CO2 to CH4 conversion.
Conclusions:
- Metal mixtures can counteract copper toxicity and improve anaerobic fermentation efficiency.
- Specific metals like Zn promote beneficial microbial communities for enhanced biogas production and substrate breakdown.
- This research supports the beneficial reuse of heavy metal-contaminated biowaste in fermentation processes.
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