Upgrade of Regional Water Treatment Plant
Lilesville, North Carolina

• Design of 8 MGD plant expansion.
• Study to high rate water treatment plant.

The design for the water treatment facility consisted of an 8 MGD surface water treatment plant upgrade utilizing the IDI SuperPulsator clarifier and conventional filters. The plant included modifications to chemical feed facilities, sludge handling facilities, finished water pumping (for two separate systems), instrumentation, and SCADA. 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 of the two distribution systems the plant serves.

• Maintaining continuous operation of existing facility - The primary project challenge involved upgrading an existing facility by adding an additional 8 MGD treatment train, while not interrupting the operation of the existing facilities. This included a complete revision of the high service pumping facilities in order to achieve CT values without the installation of new ground storage on a space-contained site.
• Location of intake structure - The Anson County intake is an existing structure located along the bank of Blewett Falls Lake on the Pee Dee River. The intake consisted of a bar screen intake with vertical turbine pumps located inside a brick structure resting on a concrete wet well. Because the lake is controlled by Carolina Power and Light, the level of the lake can be intentionally reduced to allow access to the dam structure or may be inadvertently reduced by drought. When this occurs, the raw water pump station is left out of the water. A temporary pumping arrangement was prepared to provide water to the station in the event that the water level is ever lowered to its maximum level.

HUA assisted with all equipment start-up, and systematically operated the plant for a trial period of six weeks to ensure the finished water was in compliance with regulatory standards. As part of the start-up procedures, CT tests were conducted at maximum flow to ensure the plant would meet CT guidelines. THMs were monitored to ensure that water quality was maintained during the start-up phases. During start-up phase, HUA trained all employees on the function of the plant, and how each individual piece of equipment was to be operated. HUA compiled an O&M manual and Standard Operating Procedures for the plant and the laboratory, while assisting the Owner in receiving certification for both the laboratory and the plant.

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