Anaerobic effluent disinfection using ozone: Byproducts formation

Abstract: This research was aimed at studying oxidation processes, coliform inactivation effectiveness and disinfection byproducts (DBPs) associated with the disinfection of anaerobic sanitary wastewater effluent with ozone applied at doses of 5.0, 8.0 and 10.0mg O3 L−1 for contact times of 5, 10 and 15min. The wastewater used in this research was generated by the wastewater treatment plant (WWTP), University of São Paulo – Brazil. The total coliform inactivation range was 2.00–4.06 log10, and the inactivation range for Escherichia coli was 2.41–4.65 log10. Mean chemical oxygen demand (COD) reductions were 37.6%, 48.8% and 42.4% for doses of 5.0, 8.0 and 10.0mg O3 L−1, respectively. Aldehyde formation varied with dosage only when the ozone dose was increased from 5.0 to 8.0mg O3 L−1 for acetaldehyde and from 5.0 to 8.0 and from 8.0 to 10.0mg O3 L−1 for glyoxal. [Copyright &y& Elsevier]