Journal
ENVIRONMENTAL TECHNOLOGY
Volume 25, Issue 4, Pages 433-441Publisher
SELPER LTD, PUBLICATIONS DIV
DOI: 10.1080/09593332508618452
Keywords
ultraviolet disinfection; ozone disinfection; reactivation process; microbial population; pathogenic
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A series of disinfection experiments using UV radiation and ozone was performed on the secondary effluent from a wastewater treatment plant at a pilot plant scale. The microbial population in the inflowing wastewater and the treated outflow water were quantified for each of the treatment modules (fecal coliforms, fecal streptococci, Salmonella spp. (presence/absence), Clostridium Sulphite-reducers, Pseudomonas aeruginosa, Staphylococcus aureus, coliphages, nematodes, intestinal nematodes and pathogenic fungi). Treated water was stored in opaque tanks at a temperature between 20 and 22degreesC, after which, a one-month-study of the regrowth of the bacterial flora, nematodes and fungi was carried out. Clostridium Sulphite-reducers, pathogenic fungi and nematodes were the micro-organisms showing a greatest degree of resistence to UV- and, Ozone- treatment. It was only concerning Clostridium and Pseudomonas abatement that significant elimination results were achieved with both technologies.
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