TABLE 10.
Monitoring data and removal values for LAS in U.S. wastewater treatment; data for n ≥ 3 plants shown as mean ± 6SD; data for n = 2 plants shown as mean (range)
| Treatment type | Number of plants | Influent (mg/L) | Effluent (mg/L) | Removal (%) |
|---|---|---|---|---|
| AST | 15 | 5.0 ± 61.9 | 0.04 ± 60.03 | 99.3 ± 60.11 |
| AST | 4 | 5.9 ± 62.1 | 0.034 ± 60.037 | 99.4 ± 60.12 |
| AST | 3 | 4.7 ± 60.8 | 0.004 ± 60.002 | 99.9 ± 60.13 |
| TFT | 12 | 4.2 ± 61.7 | 1.04 ± 60.98 | 77.4 ± 615.51 |
| TFT | 5 | 4.3 ± 661.6 | 0.84 ± 660.85 | 81.9 ± 615.42 |
| TFT | 6 | 4.2 ± 61.8 | 0.75 ± 60.57 | 82.3 ± 69.53 |
| RBCT | 9 | 4.7 ± 62.5 | 0.19 ± 60.38 | 96.2 ± 66.11 |
| RBCT | 1 | 2.2 | 0.022 | 99.02 |
| ODT | 6 | 5.7 ± 60.8 | 0.12 ± 60.27 | 98.0 ± 64.21 |
| LT | 8 | 4.5 ± 62.7 | 0.06 ± 60.01 | 98.5 ± 61.81 |
| PT | 4 | —* | 2.10 ± 60.40 | 27.0 ± 619.04 |
AS, activated sludge; TF, trickling filter; RBC, rotating biological contractor; OD, oxidation ditch; L, lagoon; P, primary.
*
Influent concentrations for the four treatment plants were not provided.