An evaluation of ultraviolet light used for the disinfection of sewage effluent

Studies demonstrating the toxicity of chlorinated sewage effluent to aquatic organisms indicate a need for seeking alternative methods of disinfecting waste water discharges. A preliminary study, undertaken in the laboratory, demonstrated that ultraviolet light was capable of destroying a large percentage of fecal coliforms and fecal streptococci in a mixture of raw sewage and tap water. Pilot plant studies at San Jose Creek Water Reclamation Plant and Pomona Research Facility demonstrated that ultraviolet irradiated secondary and tertiary effluents will meet the National Pollutant Discharge Elimination System permit requirements for fecal coliforms.