Ultraviolet disinfection of fecal coliform in municipal wastewater: effects of particle size

Water Environment Research : a Research Publication of the Water Environment Federation
Bethany A Madge, James N Jensen

Abstract

Suspended solids interfere with the efficiency of disinfection using UV radiation by decreasing the rate of disinfection and inducing tailing. However, conventional measures of solids (total suspended solids, turbidity, and UV transmittance) do not adequately predict the presence or degree of these effects. Bacteria and viruses can become associated with particles in wastewater. A fractionation technique was developed to separate particle-associated bacteria into three fractions, based on particle size. The results show that the degree to which particles interfere with UV disinfection efficiency is dependent on particle size. The small size fraction (< 5 microm) consistently produced a statistically significant faster disinfection rate than the large fraction (> 20 microm), with the unfiltered sample and the medium fraction (particles > 5 microm, but < 20 microm) between the two extremes. Tailing also was observed only in the large fraction. Correlations between the disinfection rate constant and the percentage of large fraction bacteria of a sample were good.

References

Feb 1, 1988·Applied and Environmental Microbiology·D BermanJ C Hoff
Apr 7, 1999·Journal of Microbiological Methods·A M Briones, W Reichardt
Sep 21, 2001·Water Environment Research : a Research Publication of the Water Environment Federation·D JolisP Pitt

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Citations

Nov 22, 2007·Journal of Applied Microbiology·K G PennellE R Blatchley
Aug 21, 2009·Water Environment Research : a Research Publication of the Water Environment Federation·H N YongT Mao
Jan 31, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·F SchmidtleinM Wichern
Jun 10, 2008·Water Environment Research : a Research Publication of the Water Environment Federation·Anita MantiStefano Papa
Jul 11, 2008·Environmental Technology·G P WinwardB Jefferson
Aug 24, 2017·Scientific Reports·Jeremy N KunzMarlan O Scully
Aug 2, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Thiam C TanRamin R Farnood

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