Studies on ozone initiated inactivation of pathogenic bacteria in aqueous systems

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Show simple item record Zuma, Favourite N. 2010-08-20T10:45:16Z 2010-08-20T10:45:16Z 2008
dc.description Thesis (M.Sc.)-University of KwaZulu-Natal, 2008. en_US
dc.description.abstract The effect of ozone on the inactivation of two Gram-negative strains (Escherichia coli and Pseudomonas aeruginosa) and one Gram-positive endospore (Bacillus subtilis) bacteria, often present in water and the cause of some waterborne diseases was investigated as a function of ozone concentration and ozonation duration. Ozone was generated in situ using corona discharge methods where the ozone concentration ranged from 0.906 - 4.724 mg/L and the inactivation of the three microbes followed pseudo-first order kinetics with respect to the microbes. Three microbes were cultured and the influence of temperature and pH of the aqueous systems on the ozone initiated inactivation rate of the three microbes was also investigated. This study reports that molecular ozone is more effective than hydroxyl radicals initiated by the ozone chain reactions. Two suggested mechanisms for the antimicrobial effectiveness of ozone in water systems from the literature is discussed. The study also found that ozonation significantly decreased the Biological Oxygen Demand (BOD) value of natural water. en_US
dc.language.iso en en_US
dc.subject Ozonization. en_US
dc.subject Pathogenic bacteria. en_US
dc.subject Water--Purification--Ozonization. en_US
dc.subject Theses--Chemistry. en_US
dc.title Studies on ozone initiated inactivation of pathogenic bacteria in aqueous systems en_US
dc.type Thesis en_US

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