Thesis
Optimal mixing regimes for alum treatment of creek inflow to Jameson Lake, Washington
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/101779
Abstract
Hydrated aluminum sulfate (alum) has been used since the early 1970s for treating water column and sediment phosphorus (P) in lakes. A new and innovative method of combating eutrophication in lakes uses engineered treatment systems to inject alum into stream inflow to reduce external P loading. We used a series of jar tests to examine the optimal alum dose and mixing regime to remove P from Matthiesen Creek, an important external source of P entering Jameson Lake, WA. Alum doses of 0, 2, 5, 10 and 20 mg-Al/L were applied under four mixing regimes: (1) slow mixing of short duration, (2) slow mixing of long duration, (3) high mixing of short duration, and (4) high mixing of short duration followed by slow mixing of long duration, and were tested to determine maximum P removal efficiency. Tests were also completed to determine the need for a settling basin at the creek outlet, compared to the treated water directly entering the lake. Overall removal efficiency was high in all mixing regimes, with 45-98% soluble reactive P and 15-89% total P removed from the creek water, and a decrease in overall lake total P (23-79%) after addition of treated creek water. The mixing regimes with a slow stirring period had the greater efficiencies after settling without lake water, but high mixing was more efficient when the treated creek water settled in lake water.
Metrics
2 File views/ downloads
9 Record Views
Details
- Title
- Optimal mixing regimes for alum treatment of creek inflow to Jameson Lake, Washington
- Creators
- Jillian Jean Churchill
- Contributors
- Marc W. Beutel (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525141601842
- Language
- English
- Resource Type
- Thesis