Table 2.
Characteristics of the activated sludge sampled from Tudhoe Mill and Sedgeletch wastewater treatment plants before and after pretreatment by filtration for inocula preparation according to international guidelines (OECD 1992a, b)
| WWTP | Sample | Sludge age (days) | Total suspended solids (TSS mg/l) | Total cell count (TCC × 107/ml)a | 4-Nitrophenol degraders (×103/ml)a | Mean OTU richnessa | Mean evennessa |
|---|---|---|---|---|---|---|---|
| Tudhoe Mill | Activated sludge | 18 | 3,750 | 169 ± 92 | 0.44 ± 0.06 | 27.8 ± 4.4 | 0.72 ± 0.07 |
| Filtrate | n/a | 76.5 | 1.63 ± 0.36 | n.d. | 22.2 ± 6.4 | 0.58 ± 0.06 | |
| Sedgeletch | Activated sludge | 8 | 3,250 | 801 ± 0.05 | 57.99 ± 0.06 | 19.8 ± 3.1 | 0.62 ± 0.04 |
| Filtrate | n/a | 12 | 14.7 ± 1.91 | n.d. | 16.2 ± 6.6 | 0.62 ± 0.04 |
n.d. not detected
aValues ± standard deviation