Understanding the effect of ventilation, intermittent pumping and seasonality in hydrogen sulfide and methane concentrations in a coastal sewerage system.

Bibliographic Details
Title:	Understanding the effect of ventilation, intermittent pumping and seasonality in hydrogen sulfide and methane concentrations in a coastal sewerage system.
Authors:	Matos, Rita Ventura, Ferreira, Filipa, Gil, Carla, Matos, José Saldanha
Source:	Environmental Science & Pollution Research; Feb2019, Vol. 26 Issue 4, p3404-3414, 11p
Subject Terms:	VENTILATION, HYDROGEN sulfide, METHANE, SEWAGE, CHEMICAL reactions
Abstract:	Gas pollutants emitted during wastewater transport contribute to atmospheric pollution, aggravated risks for utility workers, infrastructure corrosion, and odour nuisance. Field studies have shown that is difficult to effectively obtain reliable correlations between in-sewer air movement and gas pollutant concentrations. This study aimed at investigating the influence of different ventilation and operating conditions in H2S and CH4 horizontal and vertical movement in a section of a gravity sewer, downstream of a pumping station. Relevant liquid and gas phase quality parameters were monitored, and significant H2S concentrations were measured (with lower contents of CH4). Results evidenced that headspace temperature and ventilation played a key effect when analysing H2S and CH4 dynamics. Setups with a similar content of sulfide and chemical oxygen demand resulted in different H2S and CH4 headspace concentrations. It was also observed that an increase in ventilation resulted in a decrease of average headspace relative humidity of over 70%, with clear implications in corrosion potential estimates. Another interesting observation was that the wastewater drag induced by intermittent pumping, in absence of ingassing, originated pressure differences of up to 0.2 Pa m⁻¹ between studied manholes. This differential originated a wave pattern of gas moving upstream and downstream, thus resulting in several gas peaks per pumping event, at the same sections. In addition, in confined setups, full mixing was not observed along the manholes. [ABSTRACT FROM AUTHOR]
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Database:	Complementary Index

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Items	– Name: Title Label: Title Group: Ti Data: Understanding the effect of ventilation, intermittent pumping and seasonality in hydrogen sulfide and methane concentrations in a coastal sewerage system. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Matos%2C+Rita+Ventura%22">Matos, Rita Ventura</searchLink><br /><searchLink fieldCode="AR" term="%22Ferreira%2C+Filipa%22">Ferreira, Filipa</searchLink><br /><searchLink fieldCode="AR" term="%22Gil%2C+Carla%22">Gil, Carla</searchLink><br /><searchLink fieldCode="AR" term="%22Matos%2C+José+Saldanha%22">Matos, José Saldanha</searchLink> – Name: TitleSource Label: Source Group: Src Data: Environmental Science & Pollution Research; Feb2019, Vol. 26 Issue 4, p3404-3414, 11p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22VENTILATION%22">VENTILATION</searchLink><br /><searchLink fieldCode="DE" term="%22HYDROGEN+sulfide%22">HYDROGEN sulfide</searchLink><br /><searchLink fieldCode="DE" term="%22METHANE%22">METHANE</searchLink><br /><searchLink fieldCode="DE" term="%22SEWAGE%22">SEWAGE</searchLink><br /><searchLink fieldCode="DE" term="%22CHEMICAL+reactions%22">CHEMICAL reactions</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Gas pollutants emitted during wastewater transport contribute to atmospheric pollution, aggravated risks for utility workers, infrastructure corrosion, and odour nuisance. Field studies have shown that is difficult to effectively obtain reliable correlations between in-sewer air movement and gas pollutant concentrations. This study aimed at investigating the influence of different ventilation and operating conditions in H<subscript>2</subscript>S and CH<subscript>4</subscript> horizontal and vertical movement in a section of a gravity sewer, downstream of a pumping station. Relevant liquid and gas phase quality parameters were monitored, and significant H<subscript>2</subscript>S concentrations were measured (with lower contents of CH<subscript>4</subscript>). Results evidenced that headspace temperature and ventilation played a key effect when analysing H<subscript>2</subscript>S and CH<subscript>4</subscript> dynamics. Setups with a similar content of sulfide and chemical oxygen demand resulted in different H<subscript>2</subscript>S and CH<subscript>4</subscript> headspace concentrations. It was also observed that an increase in ventilation resulted in a decrease of average headspace relative humidity of over 70%, with clear implications in corrosion potential estimates. Another interesting observation was that the wastewater drag induced by intermittent pumping, in absence of ingassing, originated pressure differences of up to 0.2 Pa m<superscript>−1</superscript> between studied manholes. This differential originated a wave pattern of gas moving upstream and downstream, thus resulting in several gas peaks per pumping event, at the same sections. In addition, in confined setups, full mixing was not observed along the manholes. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Environmental Science & Pollution Research is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo	BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s11356-018-3856-3 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 3404 Subjects: – SubjectFull: VENTILATION Type: general – SubjectFull: HYDROGEN sulfide Type: general – SubjectFull: METHANE Type: general – SubjectFull: SEWAGE Type: general – SubjectFull: CHEMICAL reactions Type: general Titles: – TitleFull: Understanding the effect of ventilation, intermittent pumping and seasonality in hydrogen sulfide and methane concentrations in a coastal sewerage system. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Matos, Rita Ventura – PersonEntity: Name: NameFull: Ferreira, Filipa – PersonEntity: Name: NameFull: Gil, Carla – PersonEntity: Name: NameFull: Matos, José Saldanha IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 09441344 Numbering: – Type: volume Value: 26 – Type: issue Value: 4 Titles: – TitleFull: Environmental Science & Pollution Research Type: main
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