Table 7.2.
Pathogen removal efficiency of slow sand filter reported in various studies.
| S. No. | Removal efficiency for microbes |
|---|---|
| 1 | 45%–60% Escherichia coli |
| 2 | 4-Log10 coliform |
| 3 | 0.3-Log10 (50%) to 4-log10 E. coli, 1-log10 to 43-log10 echovirus-12, 0 to 1.3-log10 bacteriophage |
| 4 | 99.95% Total coliform and fecal coliform, 99.99% fecal streptococcus |
| 5 | 3.2-Log phages, fecal bacteria, and enteric adenoviruses |
| 6 | 4-Log total coliform; 3-log E. coli |
| 7 | 3.50-Log10 Salmonella sp., 3.95-log10 total coliform, 3.68-log10 E. coli |
| 8 | 3.71-Log10 E. coli and 2.25-log10 MS2 virus by continuous mode of operation and 1.67-log10 E. coli and 0.85-log10 MS2 virus by intermittent mode of operation |