Conversion from Conventional Treatment to Microfiltration in Carthage, NC Public Deposited

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  • February 28, 2019
  • Johnson, Thomas
    • Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
  • The Town of Carthage, North Carolina replaced its 50-year old conventional water treatment plant (WTP) with a 1-mgd microfiltration (MF) plant on May24, 2002. This is the first MF facility in the state of North Carolina. The objectives of this research were to document and discuss the changes in the water quality and treatment efficiency that were attributed to the conversion from conventional treatment (coagulation-sedimentation-filtration) to MF treatment with outchemical coagulation. Monthly samples were collected from the WTP and six locations in the distribution system (DS) from October 2001 to February 2003 with the exception of August 2002. Implementation of MF improved the water quality when measured by turbidity and particle counts. Elimination of coagulation caused the TOC to increase significantly in the DS while HPC data showed that bacterial regrowth occurred when a disinfectant residual could not be maintained. Operating costs after the conversion to MF were higher than preceding the conversion ($0.69 vs. 0.47 per 1,000gal). Given that coagulation is needed ahead of MF to reduce DBFs, this cost analysis should be repeated.
Date of publication
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Rights statement
  • In Copyright
  • Characklis, Gregory
  • DiGiano, Francis A.
  • Francisco, Donald E.
  • Master of Science in Environmental Engineering
Academic concentration
  • Environmental Engineering
Degree granting institution
  • University of North Carolina at Chapel Hill
Graduation year
  • 2003
Deposit record
  • 8daa46ae-58bd-4ddf-8097-0c44062f7d48

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