The existing water treatment facility at Kelleys Island, Ohio—built in 1973—consisted of slow sand filters for the removal of turbidity from Lake Erie. The plant effluent turbidity levels routinely exceeded 1.0 NTU, with recorded spikes of 5.0 NTU. As a result, the Ohio EPA issued a consent decree to the Village, forcing it to improve its process. Because the water quality was not meeting standards, the project had an aggressive schedule: bidding in late June 2001 with final completion required by December 31, 2001.
By November 2001 Tonka Water furnished three UTS™ modular surface water treatment units. Each unit is rated for 104 GPM and consists of an integral two-stage flocculation compartment, tube settling, and filter compartment. An alum/polymer blend is added prior to the flocculation zone to assist in turbidity removal. The filters contain a tri-media blend of garnet sand, silica sand, and an anthracite cap, and are supplied with Tonka Water’s Simul-Wash™ backwash system.
The City of Kelleys Island commissioned the plant in April of 2002, and has been meeting effluent turbidity limits ever since.
|Turbidity||30 NTU||<0.1 NTU|