Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 789, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.147859
Keywords
Anaerobic digestion; Interspecies electron transfer; Magnetite; Microbial electrolytic cell
Categories
Funding
- National Natural Science Foundation of China [51908217, 51808226]
- Shanghai Yangfan Program [19YF1414000]
- Science & Technology Innovation Action Plan of Shanghai under the Belt and Road Initiative [20230742100]
- [TP2017041]
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The study demonstrated that magnetite-enhanced bioelectrochemical stimulation can increase methane production from waste activated sludge, with the M-MEC-AD system showing the best performance. The bioelectrochemical stimulation enriched electroactive Geobacter and classical methanogens, while the integration of magnetite facilitated interspecies electron transfer, improving energy efficiency.
Microbial electrolytic cell (MEC) and magnetite (M) have shown excellent performance in promoting anaerobic digestion (AD) of biowastes. In this study, four types of anaerobic systems (i.e. single AD, M-AD, MEC-AD, and M-MEC-AD) were developed to comprehensively investigate the potential effects of magnetite-enhanced bioelectrochemical stimulation on the biodegradation of waste activated sludge (WAS) and methane (CH4) production. Results showed that M-MEC-AD system produced the highest cumulative CH4 yield, 9.4% higher than that observed in MEC-AD system. Bioelectrochemical stimulation enriched electroactive Geobacter, and classical methanogens (Methanosaeta and Methanobacterium), and the proliferation was further promoted when coupling with magnetite. The relative abundance of Geobacter (6.9%), Methanosaeta (0.3%), and Methanobacterium (12.6%) in M-MEC-AD system was about 10.8, 1.2, and 1.2 times of MEC-AD system, respectively. The integration of magnetite could serve as the conductive materials, and promote inherent indirect electron transfer (IET) and emerging direct electron transfer (DET) between methanogens and fermentative bacteria, building a more energy efficient route for interspecies electron transfer and methane productivity. This study demonstrated the positive promotion of the coupled bioelectrochemical regulation and magnetite on organic biodegradation, process stability and CH4 productivity, providing some references for the integrated technology in sludge treatment and bioenergy recovery. (C) 2021 Elsevier B.V. All rights reserved.
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