| Wastewater treatment facilities are often faced with the need to find disinfection methods that meet increasingly stringent guidelines for wastewater effluent discharged to the environment. Currently, advanced oxidation processes (AOPs) are being researched as a technique to enhance the disinfection of pathogenic organisms in order to establish an effluent quality that is safe for public health. Wastewater effluent collected from the North End Water Pollution Control Centre (NEWPCC), Winnipeg, Canada, were disinfected with peracetic acid (PAA), ultraviolet (UV) light, and/or the combination of both (PAA/UV). The main parameter that influences UV light disinfection is UV transmissivity (UVT). The NEWPCC effluent UVT averages 47.3 +/- 4.2% during normal treatment plant conditions. Thus, without altering the physical properties of wastewater effluent, this research assessed disinfection of the indicator organism---fecal coliform bacteria---by using the disinfectants individually or in combination (PAA/UV). Concentrations of PAA used were 0, 2, and 8 mg/L, whereas the fluences (dosages) of UV radiation used were 0, 5, 10, 20, and 40-mWs/cm2. (Abstract shortened by UMI.)... |
