A pilot investigation that compared ozone oxidation with an integrated ozone and granular activated carbon (GAC) process for the control of regulated disinfection by-products at the University of Central Florida's water plant located at the Orlando campus has been completed. Treatment effectiveness was measured by monitoring the parameters pH, temperature, non-purgeable dissolved organic carbon (DOC), ultraviolet absorbance at a wavelength of 254 nm (UV254), specific ultraviolet absorbance (SUVA), excitation emission matrices (EEMs) and the associated formation of the DBP chemical groups total trihalomethanes (TTHMs) and haloacetic acids (HAAs). Groundwater that contained an average of 2.5 milligrams per liter (mg/L) DOC and 0.8 mg/L total sulfide was fed to a 15 gram/hour ozone contactor prior to being transferred to two parallel GAC pilot columns, each containing a different coal-based GAC material, either denoted Filtrasorb® (FS-400) or HPC-830 (HPC-830), with an apparent density of 0.54 and 0.36 grams per cubic centimeter, respectively. Stand-alone ozone treatment having an instantaneous ozone demand of 0.82 mg/L O3 provided a 6.0 mg/L O3 residual that when held for 30 minutes, followed by the addition of 5 mg/L Cl2 to represent disinfection, reduced 48-hour TTHM formation by 22 percent, however, increased 48-hour HAA formation by 67 percent. The integrated ozone-GAC process was found to consistently reduce 24-hour and 48-hour TTHM and HAA formation to below regulatory levels through the entirety of the 420 hours of operational run-time. Results for the integrated ozone-GAC process operating at a dose of 7.20 mg/L O3 both FS-400 and HPC-830 carbon types reached an average of 60% breakthrough for UV254 and DOC in the last 1000 bed volumes of the study. Projections with these results provided an estimated 30,000 EBV and 35,000 EBV for the FS-400 and HPC-830 carbon types, respectively, and could be achieved prior to bed DOC exhaustion.
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Master of Science in Environmental Engineering (M.S.Env.E.)
College of Engineering and Computer Science
Civil, Environmental and Construction Engineering
Length of Campus-only Access
Masters Thesis (Open Access)
Higgins, Devon, "Evaluating Ozone and Granular Activated Carbon Treatment for Control of Disinfection By-Product Formation for a Central Florida Groundwater Supply" (2021). Electronic Theses and Dissertations, 2020-. 696.