AWWA ACE63230

This paper describes the steps and results that were taken to lower radionuclide levels in a single1-mgd well that feeds a localized area in Pasco County, Florida. Pasco County, located on theGulf Coast of Florida north of the Tampa Bay Metropolitan Area, provides water to nearly250,000 residents through a county-wide conveyance and distribution system. The County'swater supply comes from groundwater pumped through 29 dispersed wells throughout theCounty and three interconnects with a local wholesaler. As part of monitoring for radionuclides,Pasco County discovered levels of gross alpha and combined radium 226/228 that exceededregulated limits in one of their wells, LB Well No. 2. Once discovered, the County immediatelyshut-down the well until corrective measures could be identified and implemented. Twocorrective measures were considered: re-construction of the existing well to possibly limit oreliminate contributing zones in the aquifer; and, treatment. A hydrogeologist and driller werecontracted to perform logging of the well to identify aquifer zones that could potentially beisolated. For treatment, single use ion exchange, conventional ion exchange, pre-formed hydrousmanganese oxide filtration and reverse osmosis were considered. Four different equipmentvendors specializing in the treatment of radionuclides were contacted and requested to prepareand submit an equipment cost estimate. Eight different estimates were received and evaluated.These were used as the basis for preparing a conceptual level design and cost estimate forcapital, operations and maintenance costs for each. Includes 4 references, tables.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

16

File Size:

1 file , 350 KB