Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
Volume 44, Issue 10, Pages 929-935Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10934520902996807
Keywords
Disinfection; kinetics; ozone initiated; microbes; Pseudomonas aeruginosa
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Funding
- National Research Foundation (Pretoria)
- University of KwaZulu-Natal
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The effect of ozonation on the disinfection of Gram-negative strain, Pseudomonas aeruginosa was investigated as a function of time. Ozone was generated in situ using corona discharge method, with ozone concentrations ranging from (0.29-9.84) x 10(-5) moles L-1. The microbial inactivation kinetics followed pseudo-first-order kinetics under excess concentration conditions of ozone. With over all second-order constant, k = (4.02 +/- 0.20) x 10(4) M-1 min(-1), the reaction rate had first-order dependence both on the microbial count and ozone. The influence of temperature and pH on the ozone initiated disinfection of the microbe was also investigated. Molecular ozone is found more effective in disinfection than hydroxyl radicals. Probable mechanism for antimicrobial power of ozone in water systems is discussed. The ozone aeration decreased the biochemical oxygen demand (BOD) value of natural and microbe spiked waters significantly.
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