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 UV
intensity (real and theoretical) for MP reactor; direct fouling measurement using a modified
spectrophotometer; correlation between direct and indirect fouling
measurements;
analytical measurement of fouling layer constituents (e.g.,
metals, alkalinity, hardness);
visual MINTEQ evaluation (solubility modeling software); and,
recommendations with regards to UV technology and
system 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 for
super-saturated environments;
considerable Al, Fe, Mn and Ca fouling, increase in
Al 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 LPHO
system; direct and indirect fouling measurement needs further
testing;
based on results CIP would likely be required every 40 to
60 days in average for LPHO systems;
numerous problems with MP lamps, including loss of UV
intensity output during testing; plants should have
mechanisms 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 are
perpendicular to flow);
wiper mechanisms were effective in controlling fouling,
however, metals were detected in wiped sleeves;
significant variability was obtained for all fouling
measurements; and,
no relationship between lamp location and fouling
potential was identified. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.9 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 26 |
| Published : | 11/01/2008 |
