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Disinfection effectiveness is reduced by the presence of large particles that can shield pathogens from the disinfectant. For on-line water quality monitoring, a criterion is needed that reflects the presence of particles that are resistant to disinfection. Historically turbidity was
chosen as the criterion. Currently, there are a variety of turbidity meters on the market. Some utilized incandescent lamps (EPA Method 180.1) and others use LED light source (EPA Method 180.2 The purpose of this study was to evaluate the relationship between turbidity and particle distribution
and investigate variations in turbidity as measured by on-line meters that utilize different measurement methods. The results showed that for a given clarifier effluent, turbidity can correspond to the presence in either small or large particles, but not necessarily in a consistent or predictable
manner. Results also indicate that the readings among turbidity meters can vary significantly. The major conclusion of the study is fact that turbidity may not be the best parameter describing resistance of wastewater to disinfection, and regulations that quantify turbidity limitations need
to be revised.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.