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Riverbank Filtration for IESWTR Compliance
The Central Wyoming Regional Water System operates 29 groundwater collection devices in an alluvial aquifer adjacent to the North Platte River. These collection devices were previously designated “groundwater under the direct influence of surface water.” In lieu of constructing a conventional surface water treatment plant, the utility opted to perform a two‐year study to demonstrate that riverbank filtration (i.e., natural filtration) provided the 2.0‐log reduction of Cryptosporidium required under the Interim Enhanced Surface Water Treatment Rule (e.g., riverbank filtration is the primary filtration process). Using multiple surrogates of various sizes encompassing those of Giardia and Cryptosporidium, the utility demonstrated 2.0‐log reductions in more than 90% of matched data pairs. No Giardia cysts or Cryptosporidium oocysts were found in any of the 170 groundwater samples. This level of removal was achieved during the summer months when infiltration rates are high because of increased river stage and well‐field production.
Riverbank Filtration for IESWTR Compliance
The Central Wyoming Regional Water System operates 29 groundwater collection devices in an alluvial aquifer adjacent to the North Platte River. These collection devices were previously designated “groundwater under the direct influence of surface water.” In lieu of constructing a conventional surface water treatment plant, the utility opted to perform a two‐year study to demonstrate that riverbank filtration (i.e., natural filtration) provided the 2.0‐log reduction of Cryptosporidium required under the Interim Enhanced Surface Water Treatment Rule (e.g., riverbank filtration is the primary filtration process). Using multiple surrogates of various sizes encompassing those of Giardia and Cryptosporidium, the utility demonstrated 2.0‐log reductions in more than 90% of matched data pairs. No Giardia cysts or Cryptosporidium oocysts were found in any of the 170 groundwater samples. This level of removal was achieved during the summer months when infiltration rates are high because of increased river stage and well‐field production.
Riverbank Filtration for IESWTR Compliance
Gollnitz, William D. (author) / Clancy, Jennifer L. (author) / McEwen, J. Brock (author) / Garner, Stephen C. (author)
Journal ‐ American Water Works Association ; 97 ; 64-76
2005-12-01
13 pages
Article (Journal)
Electronic Resource
English
Regulations , Surface Water , Wyoming , Aquifers , Filtration , Cryptosporidium , Compliance , Sand
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