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Rehab for Filtration

by Carl P. Houck, Proj. Mgr.; Black & Veatch, Denver, CO,
Michael B. Smith, (M.ASCE), Head; Fort Collins Water and Wastewater Utility, Fort Collins, CO,


Serial Information: Civil Engineering—ASCE, 1988, Vol. 58, Issue 9, Pg. 65-67


Document Type: Feature article

Abstract:

Not all water treatment plants currently include filtration, but standards set forth in the Safe Drinking Water Act mandate it for surface-collected potable water. Objective is removal of Giardia lamblia, the cause of the intestinal disease giardiasis, and this was a factor in upgrading the Ft. Collins, Colo. water treatment system. An obsolete plant was abandoned and its water diverted to a second, newer plant in a $15 million rehabilitation that added 20 mgd of capacity and 15,600 ft of new transmission lines. Under a second contract, a diversion dam was improved, and a sedimentation basin and transmission tunnel were constructed for $8.6 million. A new process train in the enlarged plant incorporates two-stagerapid mix, three-stage flocculation, lamella plate sedimentation and mixed media declining rate filtration. In the existing process train, mixed media filters were also converted to the declining rate mode.

Subject Headings: Water treatment plants | Filtration | Water treatment | Sediment | Rehabilitation | Power transmission | Drinking water treatment

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