## Oxidation of dissolved organic matter in the effluent of a sewage treatment plant using ozone combined with hydrogen peroxide (O3/H2O2)

The results showed that the mineralization process takes place in two periods whose rate constants were linked to the chemical oxygen demand to biochemical oxygen demand ratio and to the chloride content of wastewaters

Roberto Rosal; Antonio Rodríguez; José Antonio Perdigón-Melón; Alice Petre; Eloy García-Calvo

2008

#### Scholarcy highlights

• The effluent from the secondary clarifier of an Urban Sewage Treatment Plant was oxidized by the combined and simultaneous use of ozone and hydrogen peroxide
• Without the addition of hydrogen peroxide, the removal of total organic carbon was no higher than 35%
• The evolution of TOC was related to the concentration of hydroxyl radicals using a second-order kinetic model in which the exposure to hydroxyl radical was included by assuming a quasi-steady-state approximation
• The concentration of hydroxyl radical was computed using the experimental data from ozone and hydrogen peroxide
• The results showed that the mineralization process takes place in two periods whose rate constants were linked to the chemical oxygen demand to biochemical oxygen demand ratio and to the chloride content of wastewaters
• The moles of TOC removed per mole of ozone consumed were in the range of 9.2–17.7 mg O3/mg TOC measured at maximum ozone efficiency, which always occurred within the first 10 min

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