The Evaluation of Alternate Methods of Reverse Osmosis Membrane Maintenance.
TEXAS UNIV AT SAN ANTONIO CENTER FOR APPLIED RESEARCH AND TECHNOLOGY
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The purpose of this study was to determine the effects of a disinfectant on the membrane surface and to determine the bactericidal efficiencies of several disinfectants on organisms found on the membrane surface. This information may help evaluate whether field disinfection of an RI unit is practicable for prolongation of service. The first direction studied the chemical effects of several iodine concentrations, as a suitable disinfectant, on polyamide and polycellulose special wound membranes in 2000-hour static immersion tests. The second direction studied and compared the bactericidal efficiency of iodine, iodine bromide, and chlorine on the test organisms. The organisms employed, Pseudomonas fluorescens, Pseudomonas aerugenosa, and Escherichia coli, were isolated from a polyamide membrane subjected to field test conditions by USAMERADCOM personnel and were determined to be the most prevalent organisms. The major conclusions derived from this study are 1 P. aeruginosa, P. fluorescens, and E. coli are the predominant microbiological agents on fouled polyamide membranes Potomac River water test site and these organisms can be isolated, identified, and cultured. 2 There is significant polyamide membrane deterioration upon immersion of the membrane in a static test system. The deterioration is evidenced by the appearance of holes of various sizes in the surface. These structural abnormalities appear after 45 days immersion in either a 1 or 5 mg1 iodine solution. 3 The organisms P. aeruginosa and P. fluorescens are more resistant than E. coli to inactivation using either iodine, iodine bromide, or chlorine as the disinfectant.
- Civil Engineering