Papers Published

1. Sharpless, Charles M. and Linden, Karl G., Interpreting collimated beam ultraviolet photolysis rate data in terms of electrical efficiency of treatment, Journal of Environmental Engineering and Science, vol. 4 no. SUPPL 1 (2005), pp. 19-26 - [S04-045] .
   (last updated on 2007/04/09)

   Abstract:
   A novel approach is presented for using fluence-based rate constants from collimated beam ultraviolet (UV) degradation kinetics to estimate electrical efficiencies for large-scale treatment of chemical contaminants. Atrazine (ATZ) and N-nitrosodimethylamine (NDMA) are given as examples. The relative electrical efficiencies of medium-pressure (MP) and low-pressure (LP) mercury lamps for treating these contaminants estimated from collimated beam data compare favorably with data collected using a bench-scale annular reactor and two different waters. For the water with higher UV transmittance, ATZ degradation was more efficient with the MP lamp by 8%, while for the water with lower transmittance the LP lamp was more efficient by 4%. For NDMA, the LP lamp was more efficient than the MP lamp in both waters tested: it was 29% more efficient in the water with higher transmittance and 58% more efficient in the water with lower transmittance. © 2005 NRC Canada.

   Keywords:
   Rate constants;Ultraviolet radiation;Pesticides;Potable water;Water treatment;Mercury vapor lamps;