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Catawba Water Treatment Plant Printable Page

Regional Water Treatment Plant Design and Upgrade
Lancaster County Water and Sewer District, SC and Union County, NC
The Lancaster County Water and Sewer District in South Carolina joined with Union County in North Carolina to form the Catawba River Water Supply project to provide safe drinking water for the region. The result has been a continuously expanding water system that is meeting the needs of this high growth area of the two states.

Key Elements
  • Pilot study of SuperPulsator technology
  • Design of original 12 MGD water treatment plant.
  • Study and design to high rate water treatment plant from 12 MGD to 18 MGD.
  • Design to add 18 MGD train (under construction).
Raw Water Analysis
HUA conducted a pilot study on the Catawba River utilizing the IDI SuperPulsator. During the design of the water treatment plant, HUA worked closely with the Catawba River Operational Staff in the monitoring of the water quality in the river. The water quality of the Catawba River varies with the flow in the river, which is controlled not only by rainfall events in the watershed but also by water control structures located upstream of the intake and operated by Duke Power Company. The SuperPulsator pilot study was effective in meeting the treatment requirements of the changing water quality and was selected as the equipment to be utilized in the design and construction.
Water Treatment Plant Design
The original design for the water treatment facility consisted of a 12 MGD surface water treatment plant utilizing the IDI SuperPulsator clarifier and the IDI Greenleaf filters. The plant included full chemical feed facilities, sludge handling facilities, finished water pumping (for two separate systems), and instrumentation and control equipment. The chemical feed system offers flexibility in the treatment chemicals used while the disinfection system allows the operator to choose between free chlorine or chloramines in either distribution system.
Plant Upgrades
The plant was upgraded from the design flow of 12 MGD to 18 MGD by high rating the existing clarification and filter systems through a full scale pilot study. In addition, construction is scheduled to be completed in late 2003 for the addition of 18 MGD treatment train to increase plant capacity to 36 MGD. HUA prepared the design and final plans and specifications for the upgrade which included the construction of new finished water pumping facilities and a 10 MG clearwell.

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