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PERFORMANCE OF OZONE AS A DISINFECTANT FOR COMBINED SEWER OVERFLOW
Citation:
Wojtenko**, I, M K. Stinson*, AND R Field*. PERFORMANCE OF OZONE AS A DISINFECTANT FOR COMBINED SEWER OVERFLOW. Logan, T.J. (ed.), JOURNAL OF ENVIRONMENTAL ENGINEERING. CRC Press LLC, Boca Raton, FL, 31(4):295-309, (2001).
Description:
Disinfection of combined sewer overflow (CSO) minimizes the amount of disease-causing microorganisms (pathogens) released into receiving waters. Currently, the primary disinfecting agent used in the US for wastewater treatment is chlorine (Cl2); however, Cl2 produces problems in aquatic ecosystems. As a result, alternative disinfectants are being investigated. This paper presents the results of a state-of-the-art review of the effectiveness of ozone (O3) for CSO disinfection. Data on major studies investingating CSO ozonation as well as its advantages and disadvantages are presented. Ozone inactivates a wider range of microorganisms than Cl2. In addition, O3 has a relatively high disinfection kill power, releases limited byproducts, is non-reactive with ammonium, and has an excellent ability for removing undesirable odor and color. The effectiveness of ozonation was found to be strongly dependent upon the occluding effects of suspended solids and influent quality. The reaction of O3 with water impurities is a major limitation. In general, ozonation can be an effective, but expensive, technology for CSO disinfection.