Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater Treatment
Nitrous oxide (N2O), known to be the highly greenhouse effect gas, is emitted from the biological wastewater treatment process. However, microbial control methods to reduce N2O emission have not been established. Therefore, in this study, we focused on nitric oxide (NO) which is a precursor of N2O p...
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Japan Society on Water Environment
2025-01-01
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| Series: | Journal of Water and Environment Technology |
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https://www.jstage.jst.go.jp/article/jwet/23/2/23_24-083/_pdf
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| author | Daichi Fujii Haruya Sugiyama Toshiaki Saito |
| author_facet | Daichi Fujii Haruya Sugiyama Toshiaki Saito |
| author_sort | Daichi Fujii |
| collection | DOAJ |
| description | Nitrous oxide (N2O), known to be the highly greenhouse effect gas, is emitted from the biological wastewater treatment process. However, microbial control methods to reduce N2O emission have not been established. Therefore, in this study, we focused on nitric oxide (NO) which is a precursor of N2O produced by ammonia-oxidizing bacteria (AOB), to clarify the mechanisms of N2O production by AOB and to experimentally verify the effectiveness of NO as a novel engineering indicator for reducing N2O production. We verified the emission characteristics and interrelationships of NO and N2O during the ammonia oxidation process using nitrifying bacteria cultivated in the laboratory-scale batch reactor. The results indicated that N2O production by AOB can be predicted by observing NO emissions. It was also confirmed that AOB regulates the supply and demand of NO by themselves depending on the amount of ammonia oxidation, and produce N2O as the way to decompose excess NO. Furthermore, we tested the applicability of our new findings to the full-scale wastewater treatment plant and experimentally demonstrated the possibility of reducing N2O production by controlling NO concentration or chemical NO removal, even in a highly diverse microbial community that includes denitrifying bacteria. |
| format | Article |
| id | doaj-art-853184a807e94a6f8e400a579c17a2cd |
| institution | DOAJ |
| issn | 1348-2165 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Japan Society on Water Environment |
| record_format | Article |
| series | Journal of Water and Environment Technology |
| spelling | doaj-art-853184a807e94a6f8e400a579c17a2cd2025-08-20T03:10:57ZengJapan Society on Water EnvironmentJournal of Water and Environment Technology1348-21652025-01-0123212013110.2965/jwet.24-08310.2965/jwet.24-083Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater TreatmentDaichi Fujii0Haruya Sugiyama1Toshiaki Saito2 Department of Civil Engineering, College of Science and Technology, Nihon University, Tokyo, Japan Department of Civil Engineering, Graduate School of Science and Technology, Nihon University, Tokyo, Japan Department of Civil Engineering, College of Science and Technology, Nihon University, Tokyo, Japan Nitrous oxide (N2O), known to be the highly greenhouse effect gas, is emitted from the biological wastewater treatment process. However, microbial control methods to reduce N2O emission have not been established. Therefore, in this study, we focused on nitric oxide (NO) which is a precursor of N2O produced by ammonia-oxidizing bacteria (AOB), to clarify the mechanisms of N2O production by AOB and to experimentally verify the effectiveness of NO as a novel engineering indicator for reducing N2O production. We verified the emission characteristics and interrelationships of NO and N2O during the ammonia oxidation process using nitrifying bacteria cultivated in the laboratory-scale batch reactor. The results indicated that N2O production by AOB can be predicted by observing NO emissions. It was also confirmed that AOB regulates the supply and demand of NO by themselves depending on the amount of ammonia oxidation, and produce N2O as the way to decompose excess NO. Furthermore, we tested the applicability of our new findings to the full-scale wastewater treatment plant and experimentally demonstrated the possibility of reducing N2O production by controlling NO concentration or chemical NO removal, even in a highly diverse microbial community that includes denitrifying bacteria. https://www.jstage.jst.go.jp/article/jwet/23/2/23_24-083/_pdf nitrous oxidenitric oxidenitric oxide scavengerwastewater treatment planton-site syringe experiment |
| spellingShingle | Daichi Fujii Haruya Sugiyama Toshiaki Saito Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater Treatment Journal of Water and Environment Technology nitrous oxide nitric oxide nitric oxide scavenger wastewater treatment plant on-site syringe experiment |
| title | Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater Treatment |
| title_full | Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater Treatment |
| title_fullStr | Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater Treatment |
| title_full_unstemmed | Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater Treatment |
| title_short | Experimental Verification of Nitric Oxide as the Novel Indicator for Nitrous Oxide Emission Control in Biological Wastewater Treatment |
| title_sort | experimental verification of nitric oxide as the novel indicator for nitrous oxide emission control in biological wastewater treatment |
| topic | nitrous oxide nitric oxide nitric oxide scavenger wastewater treatment plant on-site syringe experiment |
| url |
https://www.jstage.jst.go.jp/article/jwet/23/2/23_24-083/_pdf
|
| work_keys_str_mv | AT daichifujii experimentalverificationofnitricoxideasthenovelindicatorfornitrousoxideemissioncontrolinbiologicalwastewatertreatment AT haruyasugiyama experimentalverificationofnitricoxideasthenovelindicatorfornitrousoxideemissioncontrolinbiologicalwastewatertreatment AT toshiakisaito experimentalverificationofnitricoxideasthenovelindicatorfornitrousoxideemissioncontrolinbiologicalwastewatertreatment |