Nancy C. Nelson
Gary A. Wedemeyer
1977
<p><span>Ozone and chlorine inactivation curves were determined in three water types at 20 °C for the destruction of the fish pathogens </span><i>Aeromonas salmonicida</i><span>, the etiologic agent of furunculosis, and the enteric redmouth bacterium (ERM). In phosphate-buffered distilled water, 0.01 mg/ℓ ozone inactivated 10</span><sup>3</sup><span> cells/ml of ERM and </span><i>A</i><span>. </span><i>salmonicida</i><span> in 1/2 and 10 min, respectively. Chlorine at this concentration had little effect on either pathogen and a residual of at least 0.05 mg/ℓ was needed to achieve a complete kill within a 10-min contact time. In soft lake water (30 mg/ℓ as CaCO</span><sub>3</sub><span>) a chlorine residual of 0.1 mg/ℓ rapidly </span><span class="NLM_inline-graphic"><img src="http://www.nrcresearchpress.com/na101/home/literatum/publisher/nrc/journals/content/jfrbc/1977/jfrbc3403/f77-070/production/images/medium/f77-070c1.gif" alt="" /></span><span> inactivated </span><i>A</i><span>. </span><i>salmonicida</i><span> and ERM but in hard water (120 mg/ℓ) </span><i>A</i><span>. </span><i>salmonicida</i><span> was more resistant and 0.2 mg/ℓ chlorine was required. Ozonation of the two lake waters at 90 mg O</span><sub>3</sub><span>∙h</span><sup>−1</sup><span>∙ℓ</span><sup>−1</sup><span> (equivalent to a 0.01 mg/ℓ residual in ozone demand-free water) was required to destroy both pathogens within 10 min.In untreated soft lake water 10</span><sup>3</sup><span> cells/ml of </span><i>A</i><span>. </span><i>salmonicida</i><span> survived only 2 days, while the ERM bacterium (10</span><sup>3</sup><span> cells/ml) survived even after 20 day s in soft and hard untreated lake waters.</span></p>
application/pdf
10.1139/f77-070
en
NRC Research Press
Survival of two bacterial fish pathogens (Aeromonas salmonicida and the Enteric Redmouth Bacterium) in ozonated, chlorinated, and untreated waters
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