Launch Slideshow

New curtains in the aeration basin increase detention time and changing the flow pattern as well as adding additional floating aerators and mixers.

Wastewater treatment plant expansion is part of the town's job growth plan.

Wastewater treatment plant expansion is part of the town's job growth plan.

  • New curtains in the aeration basin increase detention time and changing the flow pattern as well as adding additional floating aerators and mixers.

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    New curtains in the aeration basin increase detention time and changing the flow pattern as well as adding additional floating aerators and mixers.

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    Kevin Fralix

    New curtains in the aeration basin increase detention time and changing the flow pattern as well as adding additional floating aerators and mixers.
  • http://www.pwmag.com/Images/Dorchester%20County%20Water%20and%20Sewer%20Department_New%20Clarifier_2_tcm111-2012377.jpg

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    Kevin Fralix

  • Two new clarifiers and a new return activated sludge pump building are part of a $7 million wastewater treatment plant upgrade thats expected to begin serving rural South Carolina residents this month.

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    Two new clarifiers and a new return activated sludge pump building are part of a $7 million wastewater treatment plant upgrade thats expected to begin serving rural South Carolina residents this month.

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    Kevin Fralix

    Two new clarifiers and a new return activated sludge pump building are part of a $7 million wastewater treatment plant upgrade that’s expected to begin serving rural South Carolina residents this month.
  • The plants two original static bar screens were replaced with six new ones.

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    The plants two original static bar screens were replaced with six new ones.

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    Kevin Fralix

    The plant’s two original static bar screens were replaced with six new ones.
  • Exerior view of the new tertiary filter.

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    Exerior view of the new tertiary filter.

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    Kevin Fralix

    Exerior view of the new tertiary filter.
  • This is the plant effluent at the outfall.

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    This is the plant effluent at the outfall.

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    This is the plant effluent at the outfall.
  • The existing chlorine contact chamber was retrofitted with blowers to raise the effluent D.O.

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    The existing chlorine contact chamber was retrofitted with blowers to raise the effluent D.O.

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    Kevin Fralix

    The existing chlorine contact chamber was retrofitted with blowers to raise the effluent D.O.
  • This is effluent on the tertiary filter.

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    This is effluent on the tertiary filter.

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    Kevin Fralix

    This is effluent on the tertiary filter.
  • Generator Switch Gear

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    Generator Switch Gear

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    Kevin Fralix

    Generator Switch Gear
  • The upgrade included the installation of a mixed liquor pump station inside the aeration basin without taking it offline; this was done by installing a temporary port-a-dam.

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    The upgrade included the installation of a mixed liquor pump station inside the aeration basin without taking it offline; this was done by installing a temporary port-a-dam.

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    Kevin Fralix

    The upgrade included the installation of a mixed liquor pump station inside the aeration basin without taking it offline; this was done by installing a temporary port-a-dam.

In the three decades since South Carolina’s Dorchester County Water & Sewer Department was formed, the agency has steadily unified piecemeal public and private water and sewer systems and wells serving 21,000 sanitary sewer customers and 7,600 water customers in a primarily rural area.

In 2009 that meant taking ownership of a 0.8 mgd wastewater treatment plant from the Town of St. George (pop. 2,100). This month, the department begins operating a $7 million expansion designed to attract industry to the county’s upper portion, an area of high unemployment, by doubling capacity. The plant is now a tertiary treatment facility capable of treating an additional 1 mgd with plans for a reclaimed water system identical to the county’s other wastewater treatment plant.

“This will also allow county residents to work closer to home,” says senior plant manager Randy Blewer. “By providing local jobs we reduce traffic and fuel consumption, and will encourage the young work force to remain and invest in the area.”

Increasing capacity and effluent quality required installing new equipment—like a UV disinfection system that’s replaced the chlorine system and a post-disinfection hydrogen peroxide system to reduce carbonaceous biochemical oxygen demand—as well as replacing much of the original equipment. But the results are worth the investment: solids will go from 8% to 9% to 19% to 22%, which means fewer trips to the landfill.