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AWWA ACE70857
- Analyses of Membrane Fouling at the Long Beach One-Pass RO and Two-Pass NF Seawater Desalination Demonstration Facility
- Conference Proceeding by American Water Works Association, 11/01/2009
- Publisher: AWWA
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This powerpoint presentation begins by providing a brief overview of the Long Beach Water Department (LBWD) demonstration facility and plant performance. Study hypotheses included the following:fouling is not easily detected by monitoring plant (system)level pressures, flows, and concentrations until it is severe(i.e., thick fouling layers); and,viable bacteria colonize the membranes, but fouling is notobserved until adequate nutrients are available to stimulatebacterial growth and biofilm formation. Study objectives were to:verify the presence of fouling material on seawater NF/ROmembranes at LBWD;identify the type of fouling material that accumulates onseawater NF/RO membrane surface at LBWD; and,evaluate the chemical cleaning methods for removing foulingmaterial from seawater NF/RO membranes at LBWD. Experimental methods presented include cleaning protocols and autopsy analyses. Summary indicates that: no evidence of fouling from plant level operational data; autopsy results demonstrated thatfirst pass membranes fouled similarly, there was very little fouling on NF pass 2, and there was viable, culturable marine bacteria on all membranes; cleaning results indicated thatcommercial cleaning was more effective for SWRO than SWNF. Includes figures.
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