Table 2: Effect of different contact times of chitosan-Ag nanoparticle on microbial contamination.
| Bacterial tests (CFU/100 ml) | chitosan-Ag nanoparticle (4 g/700 ml) | ||||
| Influent | 40 minute | 1 hour | 2 hours | 4 hours | |
| Total coliform CFU/100 ml) (mean ± S.D/100 ml) | 100000 ± 15 × 103 | 3500 ± 4 × 102 | 600 ± 0.5 × 102 | 0 | 0 |
| Fecal colifrom (CFU/100 ml) (mean ± S.D/100 ml) | 20000 ± 2 × 102 | 1700 ± 2.5 × 102 | 60 ± 7.6 | 0 | 0 |
| Fecal streptococci CFU/100 ml) (mean ± S.D/100 ml) | 1850 ± 1.3 × 102 | 500 ± 1 × 102 | 7 ± 2.5 | 0 | 0 |
| pseudomonas aeruginosa CFU/100 ml) (mean ± S.D/100 ml) | 200000 ± 104 × 103 | 4000 ± 2.5 × 102 | 2800 ± 2 × 102 | 330 ± 3.6 | 0 |