Table 1.
Total Ag concentrations (ug/L) in wastewater influents and effluents from various treatment plants (WWTP) and removal efficiency. TSS: total suspended solids. *: values in parentheses are concentration variability for three sampling days
| WWTP type |
Plant ID | Flow m3/day |
Filtration | % TSS removal |
Influent Total Ag |
Effluent Total Ag |
% Ag removal | ||
|---|---|---|---|---|---|---|---|---|---|
| Aerated lagoon | TB | 25,760 | None | 96 | 0.147 | (0.013)* | 0.025 | (0.003)* | 83 |
| JL | 27,650 | None | 92 | 0.074 | (0.025) | 0.005 | (0.001) | 93 | |
|
Secondary (Activated sludge) |
SB | 1040 | Sand | 99 | 0.202 | (0.099) | 0.002 | (0.003) | 99 |
| WL | 37,890 | None | 98 | 0.254 | (0.150) | 0.003 | (0.001) | 99 | |
| PD | 38,750 | None | 99 | 0.214 | (0.190) | 0.002 | (0.000) | 99 | |
| HG | 2170 | Sand | 99 | 0.151 | (0.099) | 0.005 | (0.002) | 97 | |
| PA | 3990 | None | 98 | 0.129 | (0.045) | 0.003 | (0.002) | 98 | |
| PW | 35,100 | None | 99 | 0.292 | (0.043) | 0.003 | (0.001) | 99 | |
| Advanced with filtration (biological nutrient removal) | E | 35,770 | Cloth disc | 99 | 0.235 | (0.010) | 0.009 | (0.001) | 96 |
| PN | 11,720 | Cloth disc | 99 | 0.402 | (0.423) | 0.008 | (0.000) | 98 |