Turbidimeters Testing at the San Jose/Santa Clara Water Pollution Control Plant
Abstract: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.
Document Type: Research Article
Publication date: January 1, 2000
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