AWWA WQTC62445

The San Juan Water District (District) owns and operates a 120 million gallonper day (MGD) capacity water treatment plant in Northern California thathas a conventional filtration treatment process. The District will need toincrease treatment capacity in the near future and developed a high filtrationrate study plan to demonstrate that the existing filters could operate atfiltration rates as high as 10 gpm/ft² and produce filtered water meeting bothexisting and anticipated regulatory requirements while concurrentlyincreasing 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, 8and 10 gpm/ft² in a high filtration rate demonstration study.Each of the four filters had an on-line turbidimeter and an on-line particlecounter to permit monitoring the filter's performance at each of the fourfiltration rates. The filters selected to operate at the four filtration rates wererotated through each of the four filtration rates during the test period tominimize the risk of bias due to individual filter and/or instrumentperformance. The filtered water data indicate that the individual filter's,turbidimeter's and particle counter's performance did vary slightly. Thestrategy of rotating operation of the four filters through each of the fourfiltration rates helped minimize possible bias and enabled the District todemonstrate that the existing filters can operate successfully at filtration ratessignificantly higher than the current DHS-approved filtration rate. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2005

Number of Pages:

24

File Size:

1 file , 1 MB