The evaluation of membranes for organic control at a Florida ground water site
A low pressure membrane process similar to reverse osmosis was investigated for trihalomethane (THM) control and consistent water production for one year at Flagler Beach, Florida (FB), a groundwater site. The FB water treatment plant (WTP) used only chlorine and produced 350 μg/L THMs in the distribution system. Several membranes were tested at Flagler Beach for THM control and productivity prior to operation. Four membranes were found to control THMs to less than the 0 .10 mg/L THM MCL at approximately 75 percent recovery and 150 psi. Each membrane that controlled THMs had a molecular weight cut-off less than 500. From these four membranes the FilmTec N 70 nanofilter was selected for pilot plant operation. The Silt Density Index and Mini Plugging Factor Index indicated that prefiltration was required at FB. During the FB year the membrane system operated 5,098 hours with 64 hours for maintenance, while sustaining production and THM quality. Water flux and permeate trihalomethane formation potentials (THMFPs) averaged 12.8 g/sfd and 20 μg/L for the year. Permeate water quality for each stage was inversely related to stage flux for the diffusion controlled process. Cost estimates for building and operating new membrane and lime softening plants demonstrated that the costs of membrane processes were similar to lime softening at Flagler Beach, Florida and produced superior water quality.
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Taylor, James S.
Master of Science (M.S.)
College of Engineering
Civil Engineering and Environmental Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Arts and Sciences -- Dissertations, Academic; Dissertations, Academic -- Arts and Sciences
Mulford, Luke A., "The evaluation of membranes for organic control at a Florida ground water site" (1989). Retrospective Theses and Dissertations. 4185.