AWWA MTC69767

This powerpoint presentation begins by providing a brief overview of the Orange County Water District and the GWR System AdvancedWater Purification. Project objectives were to:examine microfiltration (MF) fouling of polypropylene membranematerial under controlled conditions;characterize materials and conditions responsiblefor MF fouling;prevent the foulants from entering the membranematrix; and,improve permeate flux, extend membrane life anddecrease operating costs. Foulant characterization (microparticles vs. nanoparticles) is presented, along with feedwater chemistry matrix effects, and a MF coagulant pilot study. Presentation conclusions indicate the following:microparticulate cake formation is not theprimary mechanism responsible for MF fluxreduction;nanoparticles < 200 nm but > 2.5 nm (10KDaltons) can coat and enter the membrane matrixand cause pore plugging;changes in feedwater chemistry can influencenanoparticulate fouling; and,chemically aggregating nanoparticulates (< 200nm) into microparticulates (> 200 nm) lowers TMPand slows down accumulation of material in themembrane matrix and may improve membraneperformance. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

33

File Size:

1 file , 1.8 MB