This powerpoint presentation begins by providing background information on the Hanahan Water Treatment Plant in Charleston, South Carolina. Objectives of a pilot testing program included:
verify bench-scale coagulation conditions;
monitor performance of pilot units;
determine impacts of various loading rates
(settled water quality and
filterability);
determine optimal clarification operating conditions;
evaluate performance of dual-media filters;
evaluate clarification and filtration performance for removal of
turbidity,
TOC,
UV<sub>254</sub>, and
apparent color; and,
evaluate the operational robustness of each unit. The presentation presents comparisons of: clarification; filtration; organics removal; and, optimal run. A technical and economic evaluation presents the following topics: Leopold
Clari-DAF; IDI AquaDAF; MRI Plates; project costs; operating costs; and, 20-year present worth costs. Presentation summary of findings includes:
overall treatment -- all three processes could provide
acceptable treatment at optimized conditions;
flocculation --
fragile floc created challenging issues for all processes,
longer floc times required than often seen, and
floc aid polymer important, particularly for plate settlers;
plate settlers had higher median headloss rate (in/hr)
than the DAF units in winter testing, in summer testing
median headloss rates were similar; loading rates of approximately 6 gpm/sf (Leopold), 8
gpm/sf (IDI), and 0.25 gpm/sf (MRI) are appropriate. At
these loading rates, the plate settlers had the lowest
capital, operation and maintenance (O&M), and present worth cost;
utilize plate settler technology at a loading rate of 0.25
gpm/sf for future clarification basins --
good process performance during pilot testing,
familiarity of plant staff with process,
lowest capital and O&M costs, and
size basin for potential future loading rate of approximately
0.4 gpm/sf pending results of continued optimization
efforts. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 3.5 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 36 |
| Published : | 11/01/2008 |
