Effect of oxidation reduction potential on methane emission from anaerobic septic systems
Septic systems are major on-site sanitation facilities used in many developing countries to treat domestic wastewater. Climate change concerns have prompted efforts to reduce greenhouse gas (GHG) emissions; nonetheless, septic systems contribute to emissions of GHGs, such as methane. The present stu...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-04-01
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| Series: | Waste Management Bulletin |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949750724001056 |
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| author | Areke Alexander Tiareti Megumi Matsumura Taira Hidaka Fumitake Nishimura Youhei Nomura Taku Fujiwara |
| author_facet | Areke Alexander Tiareti Megumi Matsumura Taira Hidaka Fumitake Nishimura Youhei Nomura Taku Fujiwara |
| author_sort | Areke Alexander Tiareti |
| collection | DOAJ |
| description | Septic systems are major on-site sanitation facilities used in many developing countries to treat domestic wastewater. Climate change concerns have prompted efforts to reduce greenhouse gas (GHG) emissions; nonetheless, septic systems contribute to emissions of GHGs, such as methane. The present study investigated modifications to improve the operating conditions of septic systems to minimize methane emissions by evaluating the oxidation reduction potential (ORP) as an operating parameter using laboratory-scale biodegradation experiments. To investigate the influence of ORP on methane emissions, dog food and potassium nitrate were used as representatives of blackwater and alternative electron acceptors to oxygen, respectively, under various biodegradation conditions. The experimental results suggest that methane emission is suppressed at a critical ORP level (−350 to −450 mV vs. Ag/AgCl). They also showed that ORP can be used as a monitoring signal to better understand methane-producing conditions in septic systems. The proposed modifications to improve septic system operating conditions are to shorten the desludging period and provide sufficient oxygen to the septic tank, considering the critical ORP to prevent anaerobic conditions. |
| format | Article |
| id | doaj-art-bc0eeb3c7fe14eaaa4aad3fdd3d1fb51 |
| institution | DOAJ |
| issn | 2949-7507 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Waste Management Bulletin |
| spelling | doaj-art-bc0eeb3c7fe14eaaa4aad3fdd3d1fb512025-08-20T02:59:49ZengElsevierWaste Management Bulletin2949-75072025-04-0131586510.1016/j.wmb.2024.12.003Effect of oxidation reduction potential on methane emission from anaerobic septic systemsAreke Alexander Tiareti0Megumi Matsumura1Taira Hidaka2Fumitake Nishimura3Youhei Nomura4Taku Fujiwara5Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, JapanDepartment of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, JapanDepartment of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan; Department of Global Ecology, Graduate School of Global Environmental Studies, Kyoto University, Kyoto, Japan; Corresponding author at: Graduate School of Engineering, Kyoto University, Kyoto, Japan.Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, Kyoto, JapanDepartment of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan; Department of Global Ecology, Graduate School of Global Environmental Studies, Kyoto University, Kyoto, JapanDepartment of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan; Department of Global Ecology, Graduate School of Global Environmental Studies, Kyoto University, Kyoto, JapanSeptic systems are major on-site sanitation facilities used in many developing countries to treat domestic wastewater. Climate change concerns have prompted efforts to reduce greenhouse gas (GHG) emissions; nonetheless, septic systems contribute to emissions of GHGs, such as methane. The present study investigated modifications to improve the operating conditions of septic systems to minimize methane emissions by evaluating the oxidation reduction potential (ORP) as an operating parameter using laboratory-scale biodegradation experiments. To investigate the influence of ORP on methane emissions, dog food and potassium nitrate were used as representatives of blackwater and alternative electron acceptors to oxygen, respectively, under various biodegradation conditions. The experimental results suggest that methane emission is suppressed at a critical ORP level (−350 to −450 mV vs. Ag/AgCl). They also showed that ORP can be used as a monitoring signal to better understand methane-producing conditions in septic systems. The proposed modifications to improve septic system operating conditions are to shorten the desludging period and provide sufficient oxygen to the septic tank, considering the critical ORP to prevent anaerobic conditions.http://www.sciencedirect.com/science/article/pii/S2949750724001056Anaerobic digestionDissolved oxygenGreenhouse gas emissionNitrateSludge |
| spellingShingle | Areke Alexander Tiareti Megumi Matsumura Taira Hidaka Fumitake Nishimura Youhei Nomura Taku Fujiwara Effect of oxidation reduction potential on methane emission from anaerobic septic systems Waste Management Bulletin Anaerobic digestion Dissolved oxygen Greenhouse gas emission Nitrate Sludge |
| title | Effect of oxidation reduction potential on methane emission from anaerobic septic systems |
| title_full | Effect of oxidation reduction potential on methane emission from anaerobic septic systems |
| title_fullStr | Effect of oxidation reduction potential on methane emission from anaerobic septic systems |
| title_full_unstemmed | Effect of oxidation reduction potential on methane emission from anaerobic septic systems |
| title_short | Effect of oxidation reduction potential on methane emission from anaerobic septic systems |
| title_sort | effect of oxidation reduction potential on methane emission from anaerobic septic systems |
| topic | Anaerobic digestion Dissolved oxygen Greenhouse gas emission Nitrate Sludge |
| url | http://www.sciencedirect.com/science/article/pii/S2949750724001056 |
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