Design, Development, and Performance Evaluation of Solar Heating System for Disinfection of Domestic Roof-Harvested Rainwater

Figure 3

Variation in percentage reduction in microbial load with change in water temperature as a result of solar disinfection process. (1) The bar charts corresponded with the labels to the left, representing percentage reduction in microbial load. (2) The line corresponded with the labels to the right, representing water temperatures. (3) Stages of data collection refer to variation in water temperature (measured at the outlet to the heating chamber) ranging from 49 to 75^°C and the corresponding percentage reduction in microbial load. Stages 2, 3, 4, 5, 6, 7, and 8 correspond with 75, 63, 62, 60.5, 58, 52, and 49^°C, respectively.