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Microbial Structure and Energy Generation in Microbial Fuel Cells Powered with Waste Anaerobic Digestate
- Source :
- Energies, Vol 13, Iss 4712, p 4712 (2020), Energies; Volume 13; Issue 18; Pages: 4712
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- Development of economical and environment-friendly Microbial Fuel Cells (MFCs) technology should be associated with waste management. However, current knowledge regarding microbiological bases of electricity production from complex waste substrates is insufficient. In the following study, microbial composition and electricity generation were investigated in MFCs powered with waste volatile fatty acids (VFAs) from anaerobic digestion of primary sludge. Two anode sizes were tested, resulting in organic loading rates (OLRs) of 69.12 and 36.21 mg chemical oxygen demand (COD)/(g MLSS∙d) in MFC1 and MFC2, respectively. Time of MFC operation affected the microbial structure and the use of waste VFAs promoted microbial diversity. High abundance of Deftia sp. and Methanobacterium sp. characterized start-up period in MFCs. During stable operation, higher OLR in MFC1 favored growth of exoelectrogens from Rhodopseudomonas sp. (13.2%) resulting in a higher and more stable electricity production in comparison with MFC2. At a lower OLR in MFC2, the percentage of exoelectrogens in biomass decreased, while the abundance of genera Leucobacter, Frigoribacterium and Phenylobacterium increased. In turn, this efficiently decomposed complex organic substances, favoring high and stable COD removal (over 85%). Independent of the anode size, Clostridium sp. and exoelectrogens belonging to genera Desulfobulbus and Acinetobacter were abundant in MFCs powered with waste VFAs.
- Subjects :
- Control and Optimization
Microbial fuel cell
food.ingredient
MFC
anode surface
Phenylobacterium
Energy Engineering and Power Technology
Biomass
02 engineering and technology
010501 environmental sciences
01 natural sciences
lcsh:Technology
food
Electrical and Electronic Engineering
Engineering (miscellaneous)
0105 earth and related environmental sciences
Rhodopseudomonas
Renewable Energy, Sustainability and the Environment
Chemistry
lcsh:T
Chemical oxygen demand
021001 nanoscience & nanotechnology
Pulp and paper industry
waste VFA
NGS
Anaerobic digestion
Electricity generation
Digestate
0210 nano-technology
Anaerobic exercise
Energy (miscellaneous)
Subjects
Details
- Language :
- English
- ISSN :
- 19961073
- Volume :
- 13
- Issue :
- 4712
- Database :
- OpenAIRE
- Journal :
- Energies
- Accession number :
- edsair.doi.dedup.....dbd8187598789a4e6747f4fb7aff3c64