This slide presentation outlines a project of oxygenating the Upper San Leandro (USL) Reservoir. Taste and odors from Anabaena producing
Geosmin levels several times above design
capacity of ozone feed system were a problem.
A 1997 study determined excessive nutrients as the
cause of Anabaena blooms, and
recommended hypolimnetic
oxygenation to reduce internally-generated
nutrients.
The study also recommended destratification during
spring season after heavy runoff years to reduce
externally imported nutrients. A summary of the project concluded that: hypolimnetic oxygen feed for USL Reservoir required
3 tons/day after initial demand (0.2 mg/l/day);
to distribute the oxygen evenly, higher rates for
shorter periods appear to facilitate mixing;
the treatment plant experienced lower ozone demand,
as much as 50%;
manganese levels also decreased, but to a lesser
extent;
algae composition changed from blue-green to
dinoflagellates, requiring pre-chlorination;
induced mixing and lower oxygen feed resulted in
fewer dinoflagellates and more diatoms. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 37 |
| Published : | 06/01/2006 |
