The impact of different types of high surface area brush fibers with different electrical conductivity and biocompatibility on the rates of methane generation in anaerobic digestion.
KAUST DepartmentEnvironmental Science and Engineering Program
Water Desalination and Reuse Research Center (WDRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Embargo End Date2023-05-15
Permanent link to this recordhttp://hdl.handle.net/10754/669281
MetadataShow full item record
AbstractThe addition of electrically conductive materials may enhance anaerobic digestion (AD) efficiency by promoting direct interspecies electron transfer (DIET) between electroactive microorganisms, but an equivalent enhancement can also be achieved using non-conductive materials. Four high surface area brush materials were added to AD reactors: non-conductive horsehair (HB) and polyester (PB), and conductive carbon fiber (CB) and stainless steel (SB) brushes. Reactors with the polyester material showed lower methane production (68 ± 5 mL/g CODfed) than the other non-conductive material (horsehair) and the conductive (graphite or stainless steel) materials (83 ± 3 mL/g CODfed) (p < 0.05). This difference was due in part to the higher biomass concentrations using horsehair or carbon (135 ± 43 mg) than polyester or stainless steel or materials (26 ± 1 mg). A microbial community analysis indicated that the relative abundance of electroactive microorganisms was not directly related to enhanced AD performance. These results show that non-conductive materials such as horsehair can produce the same AD enhancement as conductive materials (carbon or stainless steel). However, if the material, such as polyester, does not have good biomass retention, it will not enhance methane production. Thus, electrical conductivity alone was not responsible for enhancing AD performance. Polyester, which has been frequently used as a non-conductive control material in DIET studies, should not be used for this purpose due to its poor biocompatibility as shown by low biomass retention in AD tests.
CitationBaek, G., Rossi, R., Saikaly, P. E., & Logan, B. E. (2021). The impact of different types of high surface area brush fibers with different electrical conductivity and biocompatibility on the rates of methane generation in anaerobic digestion. Science of The Total Environment, 787, 147683. doi:10.1016/j.scitotenv.2021.147683
SponsorsThis research was funded by the Stan and Flora Kappe endowment and other funds through The Pennsylvania State University.
- Direct interspecies electron transfer via conductive materials: A perspective for anaerobic digestion applications.
- Authors: Park JH, Kang HJ, Park KH, Park HD
- Issue date: 2018 Apr
- Addition of a carbon fiber brush improves anaerobic digestion compared to external voltage application.
- Authors: Baek G, Saikaly PE, Logan BE
- Issue date: 2021 Jan 1
- Influence of electrostatic field and conductive material on the direct interspecies electron transfer for methane production.
- Authors: Feng Q, Song YC, Li J, Wang Z, Wu Q
- Issue date: 2020 Sep
- Enhancing methanogenesis from anaerobic digestion of propionate with addition of Fe oxides supported on conductive carbon cloth.
- Authors: Xu Y, Wang M, Yu Q, Zhang Y
- Issue date: 2020 Apr
- Enhancing syntrophic metabolism in up-flow anaerobic sludge blanket reactors with conductive carbon materials.
- Authors: Zhao Z, Zhang Y, Woodard TL, Nevin KP, Lovley DR
- Issue date: 2015 Sep