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This powerpoint presentation begins by providing a brief overview of the Coquitlam Water Treatment Facility (WTF). Study objectives included the following:evaluate fouling occurrence in low-pressure high-output(LPHO) and medium pressure (MP) reactors;indirect fouling/aging evaluation through monitoring of UVintensity (real and theoretical) for MP reactor; direct fouling measurement using a modifiedspectrophotometer; correlation between direct and indirect foulingmeasurements;analytical measurement of fouling layer constituents (e.g.,metals, alkalinity, hardness);visual MINTEQ evaluation (solubility modeling software); and,recommendations with regards to UV technology andsystem redundancy. Materials and methods included a pilot-scale study set-up of Calgon Sentinel 12" and Trojan SWIFTSC B08. Experimental matrix, testing sequence, direct transmittance measurements, monitored parameters, and water quality are all presented. Presentation conclusions indicate the following: low metal concentration waters can still provide forsuper-saturated environments;considerable Al, Fe, Mn and Ca fouling, increase inAl content higher for longer tests;higher fouling along the influent-to-effluent flow line(lamps are parallel to flow);mechanical wipers were very effective for the LPHOsystem; direct and indirect fouling measurement needs furthertesting;based on results CIP would likely be required every 40 to60 days in average for LPHO systems;numerous problems with MP lamps, including loss of UVintensity output during testing; plants should havemechanisms in place to detect problems;MP systems fouled very fast (within one to two days)when wiper mechanisms were not activated; fouling was higher in the middle of the sleeve (lamps areperpendicular to flow);wiper mechanisms were effective in controlling fouling,however, metals were detected in wiped sleeves;significant variability was obtained for all foulingmeasurements; and,no relationship between lamp location and foulingpotential was identified. Includes tables, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 26File Size: 1 file , 1.9 MB