You are here:
PARTICLE ASSOCIATION EFFECTS ON MICROBIAL INDICATOR CONCENTRATIONS AND CSO DISINFECTION
Citation:
Perdek*, J M. AND M Borst*. PARTICLE ASSOCIATION EFFECTS ON MICROBIAL INDICATOR CONCENTRATIONS AND CSO DISINFECTION. Presented at 2000 Joint Conference on Water Resources Engineering & water Resources Planning & Management of the American Society of Civil Engineers-Urban Water Resources Research Council sponsored session, Minneapolis, MN, July 30-August 2, 2000.
Description:
Combined sewer overflow (CSO) and wastewater disinfection effectiveness are evaluated by measuring microbial indicator concentrations before and after disinfection. The standard techniques for quantifying indicators are membrane filtration and multiple-tube fermentation/most probable number. Research has shown that these methods do not measure all particle-associated organisms in sewage, underestimating total concentrations. A related finding is that microorganism occlusion by particles has been shown to reduce the effectiveness of disinfection by chlorination and by ultraviolet irradiation. This suggests the need to remove solids prior to disinfection. This paper will discuss the EPA's investigations on particle association in CSO and solids removal-disinfection treatment trains for CSO treatment.