Disinfection efficiency of urban waste water treatment depends on treated water characteristics and receiving medium. The amount of chlorine dioxide (2 to 5 mg/l) needed for a given effluent is relatively low due to its high effectiveness against many microorganisms.

No typical by-products, such as hypobromites, trihalomethanes, chloramines, are obtained with chlorine dioxide.

In a case study, bacterial analyses show that the treatment respects the limit of 2000 fecal coliforms per 100 ml of treated water and contributes to maintain the beach water quality of Deauville and Trouville in France.

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