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Disinfection is considered to be the primary mechanism for the inactivation/destruction of pathogenic organisms to prevent the spread of waterborne diseases to downstream users and the environment. It is important that wastewater be adequately treated prior to disinfection in order for any disinfectant to be effective. Table 1 lists some common microorganisms found in domestic wastewater and the diseases associated with them. Ozone is produced when oxygen (O 2) molecules are dissociated by an energy source into oxygen atoms and subsequently collide with an oxygen molecule to form an unstable gas, ozone (O 3), which is used to disinfect wastewater. Most wastewater treatment plants generate ozone by imposing a high voltage alternating current (6 to 20 kilovolts) across a dielectric discharge gap that contains an oxygen-bearing gas. Ozone is generated onsite because it is unstable and decomposes to elemental oxygen in a short amount of time after generation. Ozone is a very strong oxidant and virucide. The mechanisms of disinfection using ozone include: Direct oxidation/destruction of the cell wall with leakage of cellular constituents outside of the cell. Reactions with radical by-products of ozone decomposition. Damage to the constituents of the nucleic acids (purines and pyrimidines). Breakage of carbon-nitrogen bonds leading to depolymerization

Topics: Escherichia coli (enterotoxigenic
Year: 1999
OAI identifier: oai:CiteSeerX.psu:
Provided by: CiteSeerX
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