Photocatalytical Deactivation of Pathogens for Municipal Wastewater Reusing

Wang, Hongbo; Jia, Pingping; Ding, Ning; Pang, Guori; Wang, Ning

Photocatalytical Deactivation of Pathogens for Municipal Wastewater Reusing

2015

Wang, Hongbo | Jia, Pingping | Ding, Ning | Pang, Guori | Wang, Ning

Photocatalysis is one of environment-friendly and efficient methods for municipal wastewater disinfection. In this research, two pathogens, Staphylococcus aureus and fecal coliform, were chosen to investigate the disinfection effects of several TiO₂ photocatalysts on sewage plant secondary treatment effluent, compared with UV disinfection. The results show that TiO₂ species and concentrations, light intensity, light time, and pH all have significant influences on the pathogen deactivation. It was found that the optimum operation parameters were as follows: the P25 commercial TiO₂ powder at the concentration of 0.5 g/L, the light intensity of 40 W, and the radiation duration of 20 min. The photocatalyst performed better at either acid or alkaline condition than neutral. The TiO₂ photocatalytic deactivation to S. aureus was more effective than the UV.

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