TABLE 9.
Monitoring data and removal values for AE in U.S. wastewater treatment; data for n ≥ 3 plants shown as mean ± SD; data for n = 2 plants shown as mean (range)
| Treatment type | Number of plants | Influent (mg/L) | Primary effluent (mg/L) | Final effluent (mg/L) | Primary removal (%) | Final removal (%) |
|---|---|---|---|---|---|---|
| AST | 3 | 2.06 ± 60.20 | 1.65 ± 60.10 | 0.019 ± 60.022 | 19.3 ± 67.4 | 99.2 ± 60.91 |
| AST | 4 | 0.85 ± 60.36 | 0.002 ± 60.002 | 99.7 ± 60.32 | ||
| AST | 2 | 0.39 (0.29–0.50) | 0.0007 (0.0004–0.0010) | 99.8 (99.8–99.9)3 | ||
| TFT | 5 | 1.47 ± 60.63 | 1.20 ± 60.50 | 0.149 ± 60.134 | 18.7 ± 610.6 | 90.3 ± 67.21 |
| TFT | 2 | 1.85 (1.82–1.87) | 0.0047 (0.0022–0.0073) | 99.8 (99.6–99.9)3 | ||
| RBCT | 1 | 1.26 | 0.004 | 99.73 | ||
| ODT | 2 | 0.90 (0.62–1.19) | 0.0022 (0.0005–0.0039) | 99.8 (99.7–99.9)3 | ||
| LT | 2 | 0.84 (0.21–1.47) | 0.0055 (0.0051–0.0059) | 98.6 (97.5–99.6)3 |
AS, activated sludge treatment; TF, trickling filter treatment; RBC, rotating biological contractor treatment; OD, oxidation ditch treatment; L, lagoontreatment.
*
Values adjusted by a factor of 0.62 to account for analytical method differences between studies; see McAvoy et al. (2006) for details.