Sampling time | Lead (mg/L) | Copper (mg/L) | Nickel (mg/L) | Chromium (mg/L) | Zinc (mg/L) | |||||
Inlet | Outlet | Inlet | Outlet | Inlet | Outlet | Inlet | Outlet | Inlet | Outlet | |
Spring | 0.255 | 0.157 | 0.330 | 0.210 | 0.589 | 0.293 | 0.037 | 0.017 | 0.252 | 0.070 |
Summer | 0.300 | 0.165 | 0.340 | 0.230 | 0.660 | 0.354 | 0.019 | 0.009 | 0.246 | 0.060 |
Fall | 0.150 | 0.090 | 0.197 | 0.103 | 0.375 | 0.238 | 0.020 | 0.009 | 0.269 | 0.098 |
Winter | 0.270 | 0.120 | 0.180 | 0.098 | 0.325 | 0.205 | 0.029 | 0.012 | 0.182 | 0.049 |
Average | 0.244 ±0.065 | 0.133 ±0.035 | 0.262 ±0.085 | 0.160 ±0.070 | 0.487 ±0.162 | 0.273 ±0.065 | 0.026 ±0.008 | 0.012 ±0.004 | 0.237 ±0.068 | 0.069 ±0.021 |
Removal percent (%) | 44.7 | 40.5 | 42.5 | 55.1 | 71.1 |