The San Juan Water District (District) owns and operates a 120 million gallon
per day (MGD) capacity water treatment plant in Northern California that
has a conventional filtration treatment process. The District will need to
increase treatment capacity in the near future and developed a high filtration
rate study plan to demonstrate that the existing filters could operate at
filtration rates as high as 10 gpm/ft<sup>2</sup> and produce filtered water meeting both
existing and anticipated regulatory requirements while concurrently
increasing treatment capacity to meet short-term demands for treated water.
Four of the 24 existing filters were operated on a rotating schedule at 6, 7, 8
and 10 gpm/ft<sup>2</sup> in a high filtration rate demonstration study.
Each of the four filters had an on-line turbidimeter and an on-line particle
counter to permit monitoring the filter's performance at each of the four
filtration rates. The filters selected to operate at the four filtration rates were
rotated through each of the four filtration rates during the test period to
minimize the risk of bias due to individual filter and/or instrument
performance. The filtered water data indicate that the individual filter's,
turbidimeter's and particle counter's performance did vary slightly. The
strategy of rotating operation of the four filters through each of the four
filtration rates helped minimize possible bias and enabled the District to
demonstrate that the existing filters can operate successfully at filtration rates
significantly higher than the current DHS-approved filtration rate. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 24 |
| Published : | 11/01/2005 |
