Table 1.
Total cultivable heterotrophs, Aeromonas spp. and ceftazidime and meropenem resistance bacterial counts (expressed in CFU/mL) and percentage of resistant isolates (% resistants) isolated from influent, activated sludge and effluent of UWTP.
| Time | Sampling point | Total heterotrophs | Total ceftazidime resistant | % Resistants | Total meropenem resistant | % Resistant | Total Aeromonas | % Aeromonas |
|---|---|---|---|---|---|---|---|---|
| September 2011 | Influent | 2.40E+06 | 9.56E+05 | 39.8 | 3.90E+04 | 1.6 | nd | – |
| Activated sludge | 1.00E+07 | 4.24E+05 | 4.2 | 4.47E+04 | 0.4 | nd | – | |
| Effluent | 2.30E+04 | 1.14E+03 | 5.0 | 4.90E+01 | 0.2 | nd | – | |
| October 2011 | Influent | 1.43E+06 | 4.80E+05 | 33.6 | 5.00E+03 | 0.3 | nd | – |
| Activated sludge | 4.20E+07 | 8.80E+05 | 2.1 | 7.50E+04 | 0.2 | nd | – | |
| Effluent | 2.20E+04 | 1.20E+03 | 5.5 | 2.10E+02 | 1.0 | nd | – | |
| April 2014 | Influent | 1.00E+07 | 8.00E+04 | 0.8 | 6.00E+03 | 0.1 | 5.30E+05 | 5.3 |
| Activated sludge | 1.02E+07 | 5.00E+05 | 4.9 | 1.00E+04 | 0.1 | 7.05E+04 | 0.7 | |
| Effluent | 5.00E+04 | 2.00E+03 | 4.0 | 5.00E+02 | 1.0 | 3.25E+03 | 6.5 | |
| June 2014 | Influent | 4.30E+06 | 5.60E+05 | 13.0 | 4.52E+03 | 0.1 | 9.63E+04 | 2.2 |
| Activated sludge | 2.23E+07 | 2.13E+05 | 1.0 | 2.54E+02 | 0.0 | 4.50E+04 | 0.2 | |
| Effluent | 8.60E+04 | 2.20E+03 | 2.6 | 2.30E+01 | 0.0 | 7.80E+03 | 9.1 |