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Emerging investigators series: revisiting greenhouse gas mitigation from conventional activated sludge and anaerobic-based wastewater treatment systems

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dc.contributor.author Chen, Siming
dc.contributor.author Harb, Moustapha
dc.contributor.author Sinha, Pooja
dc.contributor.author Smith, Adam L.
dc.date.accessioned 2019-03-11T10:13:27Z
dc.date.available 2019-03-11T10:13:27Z
dc.date.copyright 2018 en_US
dc.identifier.issn 2053-1419 en_US
dc.identifier.uri http://hdl.handle.net/10725/10168
dc.description.abstract Recent literature on carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) emissions from wastewater treatment plants (WWTPs) has highlighted the poor consensus in total greenhouse gas (GHG) estimation (ranging from 0.243 to 2.4 kg CO2e per m3). In the present study, the major components of GHG emission variability in both conventional activated sludge (CAS) and mainstream anaerobic WWTPs are systematically investigated as a basis for delineating a roadmap to their future control and minimization. Through analysis of N2O generation pathways, it was determined that additional research via isotope labelling is necessary to elucidate distinct generation mechanisms in CAS WWTPs (e.g., nitrifier denitrification and hydroxylamine denitrification) and better predict N2O contributions to total GHGs. Conversely, mainstream anaerobic processes, although a potentially more sustainable alternative to conventional aerobic treatment, introduce effluent dissolved CH4 as a potentially significant GHG contributor. Sweep gas and vacuum driven membrane contactors are promising dissolved methane management strategies. However, further optimization of gas-to-liquid ratios and transmembrane pressures, respectively, are vital to balancing treatment efficiency with energy neutral/positive operation. Overall, a thorough elucidation of N2O generation pathways in CAS WWTPs and the development of effective dissolved CH4 management strategies for mainstream anaerobic processes will define their respective future roles in reducing wastewater-associated GHG emissions. en_US
dc.language.iso en en_US
dc.title Emerging investigators series: revisiting greenhouse gas mitigation from conventional activated sludge and anaerobic-based wastewater treatment systems en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SOE en_US
dc.author.idnumber 201806912 en_US
dc.author.department Civil Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Environmental Science: Water Research & Technology en_US
dc.journal.volume 4 en_US
dc.journal.issue 11 en_US
dc.article.pages 1739-1758 en_US
dc.identifier.doi http://dx.doi.org/10.1039/C8EW00545A en_US
dc.identifier.ctation Chen, S., Harb, M., Sinha, P., & Smith, A. L. (2018). Emerging investigators series: revisiting greenhouse gas mitigation from conventional activated sludge and anaerobic-based wastewater treatment systems. Environmental Science: Water Research & Technology, 4(11), 1739-1758. en_US
dc.author.email moustapha.harb@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url https://pubs.rsc.org/en/content/articlehtml/2018/ew/c8ew00545a en_US
dc.orcid.id https://orcid.org/0000-0002-1566-987X en_US
dc.author.affiliation Lebanese American University en_US


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