Fluorescent nano particle application for surface integrity test of compromised membrane

Fluorescent nano particle application for surface integrity test of compromised membrane
Fluorescent nanoparticle; Membrane; Integrity Test; Image analysis; Test method
Issue Date
9th conference in the series Membranes in the Production of Drinking and Industrial Water, MDIW 2010
In this research, silica based nano-particles were used as a surrogate detector to evaluate the compromised integrity of a flat sheet membrane. Three different sizes of particles were synthesized and dyed with a fluorescent dye to be easily detected under a UV light. Experiments were designed to test the sensitivity and usability of the particle detection method. UV spectrometer and image analysis methods were used to evaluate the detection limits and sensitivity of the concentration and particle mass of the particles. The usability of the particles was tested by initially evaluating the effect and particle outflow of the nano-particles on undamaged membranes. Initial tests were followed by an integrity test with damaged membranes. Different size holes were punctured on a membrane and filtered with feed waters containing nano-particles. The amount of the particle rejection and outflow was measured with the image analysis method. Additional dye-leakage tests were conducted to estimate the amount of fluorescent decay when nano-particles were submerged in aqueous solvents. Application of the nano particles will provide a novel method for a more simplified on-line integrity test.
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