An assay based on application of dyed microspheres has been developed for
characterization of process performance in photochemical reactors. Previous applications of
these microspheres have involved reactor systems based on monochromatic lamp output at a
characteristic wavelength of 254 nm (i.e., low-pressure Hg lamps). Unlike low-pressure Hg
lamps, radiation from medium pressure lamps is not limited to 254 nm. Moreover, excimer
lamps, which may deliver germicidal ultraviolet (UV) radiation other than 254 nm, represent a possible nonmercury-
containing alternative UV source. To increase the generality of the application of dyed
microsphere method, its performance in characterizing reactors delivering non-254 nm, or
polychromatic UV radiation has been tested. Wavelength-dependent UV dose-response behavior
of the dyed microspheres has been characterized using several different types of collimated
beams. Collimators based on KrCl and XeBr excimer lamps have been used to deliver nearly
monochromatic radiation at 222 nm and 282 nm, respectively. Collimated UV radiation from a
medium pressure mercury lamp was conditioned using narrow band-pass optical filters to
examine dose-response behavior more generally over the wavelength range 214 nm to 297 nm.
The dose-response experiments conducted in this study, therefore, have provided theoretical and
practical preparation for flow-through experiments with dyed microspheres on UV systems with
medium pressure lamps and a prototype UV reactor that employs an excimer lamp. Includes 4 references, figure.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 830 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 11/01/2005 |
