Liquid-gas mass transfer at drop structures

Natércia Matias, Asbjørn Haaning Nielsen, Jes Vollertsen, Filipa Ferreira, José Saldanha Matos

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

2 Citationer (Scopus)

Resumé

Over the last decades, considerable progress has been made in the understanding of the sulfur cycle in sewer systems. In spite of a wealth of experimental and field studies that have addressed the release of hydrogen sulfide from free surface flows in gravity sewers and the corresponding air-water mass transfer, little is known about hydrogen sulfide emission under highly turbulent conditions (e.g., drop structures, hydraulic jumps). In this study, experimental work was carried out to analyze the influence of characteristics of drops on reaeration. Physical models were built, mimicking typical sewer drop structures and allowing different types of drops, drop heights, tailwater depths and flow rates. In total, 125 tests were performed. Based on their results, empirical expressions translating the relationship between the mass transfer of oxygen and physical parameters of drop structures were established. Then, by applying the two-film theory with two-reference substances, the relation to hydrogen sulfide release was defined. The experiments confirmed that the choice of the type of drop structure is critical to determine the uptake/emission rates. By quantifying the air-water mass transfer rates between free-fall and backdrop types of drop, the latter resulted in considerably lower oxygen uptake rates.
OriginalsprogEngelsk
TidsskriftWater Science and Technology
Vol/bind75
Udgave nummer10
Sider (fra-til)2257-2267
ISSN0273-1223
DOI
StatusUdgivet - 2017

Fingerprint

mass transfer
Mass transfer
hydrogen sulfide
liquid
Liquids
Gases
gas
Sewers
Hydrogen sulfide
water mass
free surface flow
sulfur cycle
oxygen
hydraulic structure
air
experimental study
Hydraulic jump
gravity
Oxygen
Air

Emneord

  • Air-water mass transfer
  • Dissolved oxygen
  • Sewer drop structures
  • Turbulence
  • Uptake/emission rates

Citer dette

Matias, Natércia ; Nielsen, Asbjørn Haaning ; Vollertsen, Jes ; Ferreira, Filipa ; Matos, José Saldanha. / Liquid-gas mass transfer at drop structures. I: Water Science and Technology. 2017 ; Bind 75, Nr. 10. s. 2257-2267.
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title = "Liquid-gas mass transfer at drop structures",
abstract = "Over the last decades, considerable progress has been made in the understanding of the sulfur cycle in sewer systems. In spite of a wealth of experimental and field studies that have addressed the release of hydrogen sulfide from free surface flows in gravity sewers and the corresponding air-water mass transfer, little is known about hydrogen sulfide emission under highly turbulent conditions (e.g., drop structures, hydraulic jumps). In this study, experimental work was carried out to analyze the influence of characteristics of drops on reaeration. Physical models were built, mimicking typical sewer drop structures and allowing different types of drops, drop heights, tailwater depths and flow rates. In total, 125 tests were performed. Based on their results, empirical expressions translating the relationship between the mass transfer of oxygen and physical parameters of drop structures were established. Then, by applying the two-film theory with two-reference substances, the relation to hydrogen sulfide release was defined. The experiments confirmed that the choice of the type of drop structure is critical to determine the uptake/emission rates. By quantifying the air-water mass transfer rates between free-fall and backdrop types of drop, the latter resulted in considerably lower oxygen uptake rates.",
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Liquid-gas mass transfer at drop structures. / Matias, Natércia; Nielsen, Asbjørn Haaning; Vollertsen, Jes; Ferreira, Filipa; Matos, José Saldanha.

I: Water Science and Technology, Bind 75, Nr. 10, 2017, s. 2257-2267.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Liquid-gas mass transfer at drop structures

AU - Matias, Natércia

AU - Nielsen, Asbjørn Haaning

AU - Vollertsen, Jes

AU - Ferreira, Filipa

AU - Matos, José Saldanha

PY - 2017

Y1 - 2017

N2 - Over the last decades, considerable progress has been made in the understanding of the sulfur cycle in sewer systems. In spite of a wealth of experimental and field studies that have addressed the release of hydrogen sulfide from free surface flows in gravity sewers and the corresponding air-water mass transfer, little is known about hydrogen sulfide emission under highly turbulent conditions (e.g., drop structures, hydraulic jumps). In this study, experimental work was carried out to analyze the influence of characteristics of drops on reaeration. Physical models were built, mimicking typical sewer drop structures and allowing different types of drops, drop heights, tailwater depths and flow rates. In total, 125 tests were performed. Based on their results, empirical expressions translating the relationship between the mass transfer of oxygen and physical parameters of drop structures were established. Then, by applying the two-film theory with two-reference substances, the relation to hydrogen sulfide release was defined. The experiments confirmed that the choice of the type of drop structure is critical to determine the uptake/emission rates. By quantifying the air-water mass transfer rates between free-fall and backdrop types of drop, the latter resulted in considerably lower oxygen uptake rates.

AB - Over the last decades, considerable progress has been made in the understanding of the sulfur cycle in sewer systems. In spite of a wealth of experimental and field studies that have addressed the release of hydrogen sulfide from free surface flows in gravity sewers and the corresponding air-water mass transfer, little is known about hydrogen sulfide emission under highly turbulent conditions (e.g., drop structures, hydraulic jumps). In this study, experimental work was carried out to analyze the influence of characteristics of drops on reaeration. Physical models were built, mimicking typical sewer drop structures and allowing different types of drops, drop heights, tailwater depths and flow rates. In total, 125 tests were performed. Based on their results, empirical expressions translating the relationship between the mass transfer of oxygen and physical parameters of drop structures were established. Then, by applying the two-film theory with two-reference substances, the relation to hydrogen sulfide release was defined. The experiments confirmed that the choice of the type of drop structure is critical to determine the uptake/emission rates. By quantifying the air-water mass transfer rates between free-fall and backdrop types of drop, the latter resulted in considerably lower oxygen uptake rates.

KW - Air-water mass transfer

KW - Dissolved oxygen

KW - Sewer drop structures

KW - Turbulence

KW - Uptake/emission rates

KW - Air-water mass transfer

KW - Dissolved oxygen

KW - Sewer drop structures

KW - Turbulence

KW - Uptake/emission rates

U2 - 10.2166/wst.2017.103

DO - 10.2166/wst.2017.103

M3 - Journal article

VL - 75

SP - 2257

EP - 2267

JO - Water Science and Technology

JF - Water Science and Technology

SN - 0273-1223

IS - 10

ER -