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Carbon-based conductive materials enhance biomethane recovery from organic wastes: A review of the impacts on anaerobic treatment
Date
2022-03-01
Author
Kutlar, Feride Ece
Tunca, Berivan
Yılmazel, Yasemin Dilşad
Metadata
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Amongst the most important sustainable waste management strategies, anaerobic biotechnology has had a central role over the past century in the management of high-pollution load sources, such as food, agricultural and municipal wastes. During anaerobic digestion (AD), valuable by-products such as digestate and biogas are produced. Biogas (mainly composed of methane) is generated through a series of reactions between bacteria and archaea. Enhancement of AD process with higher methane yield, accelerated methane production rate, and shorter start-up time is possible via tapping into a novel methanogenic pathway discovered a decade ago. This fundamentally new concept that is a substitute to interspecies hydrogen transfer is called direct interspecies electron transfer (DIET). DIET, a thermodynamically more feasible way of electron transfer, has been proven to occur between bacteria and methanogens. It is well-documented that amendment of carbon-based conductive materials (CCMs) can stimulate DIET via serving as an electrical conduit between microorganisms. Therefore, different types of CCMs such as biochar and activated carbon have been amended to a variety of AD reactors and enhancement of process performance was reported. In this review, a comparative analysis is presented for enhancement of AD performance in relation to major CCM related factors; electrical conductivity, redox properties, particle size and dosage. Additionally, the impacts of AD operational conditions such as organic loading rate and temperature on CCM amended reactors were discussed. Further, the changes in microbial communities of CCM amended reactors were reviewed and future perspectives along with challenges for CCM application in AD have been provided.
Subject Keywords
Anaerobic digestion
,
Carbon-based conductive materials
,
Direct interspecies electron transfer (DIET)
,
Methane
,
Organic wastes
,
INTERSPECIES ELECTRON-TRANSFER
,
GRANULAR ACTIVATED CARBON
,
METHANE PRODUCTION
,
SYNTROPHIC METABOLISM
,
CO-DIGESTION
,
FOOD WASTE
,
MICROBIAL COMMUNITY
,
AMMONIA INHIBITION
,
BIOCHAR
,
SLUDGE
URI
https://hdl.handle.net/11511/95126
Journal
CHEMOSPHERE
DOI
https://doi.org/10.1016/j.chemosphere.2021.133247
Collections
Department of Environmental Engineering, Article
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F. E. Kutlar, B. Tunca, and Y. D. Yılmazel, “Carbon-based conductive materials enhance biomethane recovery from organic wastes: A review of the impacts on anaerobic treatment,”
CHEMOSPHERE
, vol. 290, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/95126.