TABLE 1.
Chemical parameters for the inflowing groundwater and the oxidation basin of the planta
| Location | pH | Eh (mV) | Temp (°C) | Fe2+ concn (mg/liter) | Fe3+ concn (mg/liter) | SO42− concn (mg/liter) | Total inorganic carbon concn (mg/liter) | Total organic carbon concn (mg/liter) | NH4 concn (mg/liter) | Cl− concn (mg/liter) |
|---|---|---|---|---|---|---|---|---|---|---|
| Inflow | 4.9 | 270 | 17 | 630 | 3 | 2,700 | 98 | 50 | 0.6 | 21 |
| Oxidation basin | 3 | 480 | 17 | 100 | 300 | 2,400 | NDb | ND | ND | ND |
a
The oxygen concentration 20 cm below the water surface decreased from approximately 8 mg/liter around the inflow area to about 5 mg/liter in the middle of the oxidation basin.
b
ND, not determined.