Residence time distribution studies and design of aerobic bioreactors
- Battelle Pacific Northwest, Richland, WA (United States)
- Utah State Univ., Logan, UT (United States). Dept. of Civil and Environmental Engineering
In previous studies, the evaluation of the performance of fixed-film bioreactors used for treatment of wood-preserving chemicals suggested that irrespective of water flowrates, the removal efficiency of naphthalene was the least affected among the mixture of PAHs. The authors subsequently reported that certain tracers, such as the polyaromatic Rhodamine B dye had about half the residence time compared to KCl (no surfactant properties) because of its partitioning at the bubble interface in an upflow reactor. Later, the authors developed a model to understand the removal of contaminants because of their attachment and partitioning to the air bubbles. In the current communication, the authors are reporting the use of this model to understand the effect of bubble partitioning of pollutants in an aerobic fixed-film bioreactor during treatment of groundwater at a wood-preserving site. The study suggests that significant portions of polycyclic aromatic hydrocarbons (PAHs), especially naphthalene, having high Henry`s law constant values would be removed from the reactor via volatilization. The results also suggest that the residence time of contaminants is independent of water flowrate but is dependent on the air flowrate and bubble diameter.
- OSTI ID:
- 479337
- Report Number(s):
- CONF-950483--; ISBN 1-57477-010-1
- Country of Publication:
- United States
- Language:
- English
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