| Type of Document |
Master's Thesis |
| Author |
Olinde, Lindsay
|
| URN |
etd-05032007-093447 |
| Title |
Sediment Oxygen Demand Kinetics |
| Degree |
Master of Science |
| Department |
Environmental Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Little, John C. |
Committee Chair |
| Boardman, Gregory D. |
Committee Member |
| Vikesland, Peter J. |
Committee Member |
|
| Keywords |
- diffusion
- Monod
- zero-order
- first-order
- model
|
| Date of Defense |
2007-04-24 |
| Availability |
restricted |
Abstract
Hypolimnetic oxygen diffusers increase sediment oxygen demand (SOD) and, if not accounted for in design, can further exacerbate anoxic conditions. A study using extracted sediment cores, that included both field and laboratory experiments, was performed to investigate SOD kinetics in Carvin’s Cove Reservoir, a eutrophic water supply reservoir for Roanoke, Virginia. A bubble-plume diffuser is used in Carvin’s Cove to replenish oxygen consumed while the reservoir is thermally stratified. The applicability of zero-order, first-order, and Monod kinetics to describe transient and steady state SOD was modeled using analytical and numerical techniques. Field and laboratory experiments suggested that first-order kinetics characterize Carvin’s Cove SOD. SOD calculated from field experiments reflected diffuser flow changes. Laboratory experiments using mini-diffusers to vary dissolved oxygen concentration and turbulence were conducted at 4°C and 20°C. Similar to field observations, the laboratory results followed changes in mini-diffuser flow. Kinetic-temperature relationships were also observed in the laboratory experiments. A definitive conclusion could not be made on the broad applicability of first-order kinetics to Carvin’s Cove SOD due to variability within field experiments. However, in situ experiments are underway that should assist in the overall understanding of the reservoir’s SOD kinetics.
|
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