Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A Different Approach for Predicting Reaeration Rates in Gravity Sewers and Completely Mixed Tanks
A new semiempirical approach is presented for predicting air‐to‐water oxygen transfer rates in mixed tanks and gravity sewers, using methods adopted from mixing theory. First, a flocculation unit was used to impart selected mean velocity gradients (G) into a completely mixed tank, from which oxygen was first removed, and dissolved oxygen concentrations were measured with time. Regression analysis was used to fit the rate of oxygen transfer equation against G. The reaeration rate in completely mixed reactors was found to be proportional to G 2 (R 2 = 0.987). Subsequently, G was linked to headloss in sewers, and the equation was calibrated using a slope‐adjustable, 27‐m‐long, gravity‐flow, experimental sewer (internal diameter, D = 0.16 m). Here, the reaeration rate was proportional to G 1 (R 2 = 0.981). The equation was compared with existing oxygen transfer models and validated against experimental data from the literature, to which the overall mass transfer coefficient for oxygen, K L a, derived by the new approach, conformed well.
A Different Approach for Predicting Reaeration Rates in Gravity Sewers and Completely Mixed Tanks
A new semiempirical approach is presented for predicting air‐to‐water oxygen transfer rates in mixed tanks and gravity sewers, using methods adopted from mixing theory. First, a flocculation unit was used to impart selected mean velocity gradients (G) into a completely mixed tank, from which oxygen was first removed, and dissolved oxygen concentrations were measured with time. Regression analysis was used to fit the rate of oxygen transfer equation against G. The reaeration rate in completely mixed reactors was found to be proportional to G 2 (R 2 = 0.987). Subsequently, G was linked to headloss in sewers, and the equation was calibrated using a slope‐adjustable, 27‐m‐long, gravity‐flow, experimental sewer (internal diameter, D = 0.16 m). Here, the reaeration rate was proportional to G 1 (R 2 = 0.981). The equation was compared with existing oxygen transfer models and validated against experimental data from the literature, to which the overall mass transfer coefficient for oxygen, K L a, derived by the new approach, conformed well.
A Different Approach for Predicting Reaeration Rates in Gravity Sewers and Completely Mixed Tanks
Lahav, Ori (Autor:in) / Binder, Assaf (Autor:in) / Friedler, Eran (Autor:in)
Water Environment Research ; 78 ; 730-739
01.07.2006
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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