An investigation has been completed that assessed the efficiency of tray and spray aeration processes on the removal of regulated total trihalomethanes (TTHMs) at two publicly owned potable groundwater treatment facilities located in Polk County, Florida: the Providence and Van Fleet water treatment plants (WTPs). Finished water from each of these facilities was fed to a pilot-plant that could be operated as either a tray, spray, or combined configuration. A series of four pilot aerator configurations were tested at each WTP. Test 1 evaluated the tray aerator operated in a recirculated multiple-pass mode. It was shown that three passes across the same tray aerator configuration was effective in reducing 96-hour TTHM formation by 48% and 63% at the Providence and Van Fleet WTPs, respectively. Test 2 (a) measured the effect of increased tray surface area on TTHM reduction. It was shown that increasing the tray aerator surface area by 40% decreased the 96-hour TTHM formation at the Providence and Van Fleet WTPs by 25% and 66%, respectively. Test 2 (b) evaluated the effectiveness of spray aeration on TTHM reduction, resulting in a decrease of 14% in the 96-hour TTHM concentrations at both WTPs. Test 2 (c) combined tray and spray aeration integrated with an increased tray surface area. A 22% and 25% decrease in 96-hour TTHM concentrations was observed with this combined configuration at the Providence and Van Fleet WTPs, respectively. The five regulated haloacetic acid (HAA5) disinfection by-product concentrations were found to be largely unaffected by aeration. Results of this study indicated that the implementation of more surface area within the existing tray aeration units would reduce 96-hour TTHM formation concentrations. The addition of a recirculation pump would aid in reducing 96-hour TTHM formation but could be limited by the operation of the ground storage tank at each site.
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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)
Protas, Zachary, "Investigating the Removal of Total Trihalomethanes in Tray and Spray Aeration Processes at Two Central Florida Groundwater Treatment Facilities" (2021). Electronic Theses and Dissertations, 2020-. 1151.