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The liquid sulfide concentration in the upstream trunk was low (less than 1.0 mg\/L), and no H2S gas was detected in the head space under this low concentration. However, high H2S gas concentration was detected in the middle reach of the trunk due to the stripping effect of the three drops (2.7 m, 5.2 m and 2.0 m) along the trunk. The released H2S at drops was then transported in the sewer system and emitted at various locations and caused odor concerns. These drops played an important role in H2S release, and the overall H2S mass transfer coefficient at drops was much higher than that in normal gravity sewers. The overall oxygen and H2S mass transfer coefficient (KLa) was estimated to be around 200 h\u22121 and 300 h\u22121 at the first two drops, respectively. Field sampling of biofilm indicates that Desulfomicrobium was identified as the sulfate-reducing bacteria (SRB) responsible for sulfide generation in sewer wall biofilm and Thiobacillus was the only predominant member in manhole wall biofilm contributing to sewer manhole corrosion.<\/jats:p>","DOI":"10.2166\/wst.2020.475","type":"journal-article","created":{"date-parts":[[2020,10,6]],"date-time":"2020-10-06T02:09:40Z","timestamp":1601950180000},"page":"2271-2281","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":6,"title":["Case study of H2S release and transport in a trunk sewer with drops"],"prefix":"10.2166","volume":"82","author":[{"given":"Zhi","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David Z.","family":"Zhu","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Yu","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen","family":"Edwini-Bonsu","sequence":"additional","affiliation":[{"name":"Drainage Planning, EPCOR Drainage Services, Edmonton, AB T5 J 3A3, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam","family":"Shypanski","sequence":"additional","affiliation":[{"name":"Drainage Planning, EPCOR Drainage Services, Edmonton, AB T5 J 3A3, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanchen","family":"Liu","sequence":"additional","affiliation":[{"name":"International Joint Laboratory on Low Carbon Clean Energy Innovation, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"945","published-online":{"date-parts":[[2020,10,5]]},"reference":[{"key":"key-10.2166\/wst.2020.475-1","volume-title":"Standard Methods for the Examination of Water and Wastewater","author":"APHA, AWWA & WEF","year":"2017"},{"key":"key-10.2166\/wst.2020.475-2","doi-asserted-by":"publisher","DOI":"10.2166\/wst.2017.246"},{"key":"key-10.2166\/wst.2020.475-3","doi-asserted-by":"publisher","DOI":"10.1038\/ismej.2012.8"},{"key":"key-10.2166\/wst.2020.475-4","volume-title":"Aristotle, Galileo, and the Tower of Pisa","author":"Cooper","year":"1935"},{"key":"key-10.2166\/wst.2020.475-5","doi-asserted-by":"publisher","DOI":"10.3389\/fmicb.2014.00525"},{"key":"key-10.2166\/wst.2020.475-6","doi-asserted-by":"publisher","DOI":"10.1007\/s00253-016-7307-0"},{"key":"key-10.2166\/wst.2020.475-7","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2180-12-122"},{"key":"key-10.2166\/wst.2020.475-8","doi-asserted-by":"publisher","DOI":"10.4056\/sigs.1503846"},{"key":"key-10.2166\/wst.2020.475-9","doi-asserted-by":"publisher","DOI":"10.1061\/(ASCE)EE.1943-7870.0001336"},{"key":"key-10.2166\/wst.2020.475-10","doi-asserted-by":"publisher","DOI":"10.1016\/S0964-8305(02)00054-9"},{"key":"key-10.2166\/wst.2020.475-11","doi-asserted-by":"publisher","DOI":"10.1099\/ijs.0.65387-0"},{"key":"key-10.2166\/wst.2020.475-12","doi-asserted-by":"crossref","unstructured":"Hvitved-Jacobsen T., Vollertsen J., Nielsen A. 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