Table 2.
Selected physicochemical and toxicological parameters of concentrated galvanic wastewater.
| Parameter | Unit | Result * |
|---|---|---|
| pH | - | 3.1 ± 0.1 |
| Specific electrical conductivity (SEC) | mS/cm | 20.31 ± 2.03 |
| Salinity | g NaCl/L | 10.16 ± 1.02 |
| Turbidity | FAU | 19 ± 2 |
| Color | mg Pt/L | <10 |
| Total Suspended Solids (TSS) | mg/L | 12.5 ± 1.2 |
| Chemical Oxygen Demand (COD) | mg O2/L | 2900 ± 145 |
| Total Organic Carbon (TOC) | mg/L | 985 ± 49 |
| Chloride | mg/L | 6300 ± 315 |
| Sulphate | mg/L | 65 ± 3 |
| Total phosphorus (Total P) | mg/L | <0.3 |
| Total nitrogen (Total N) | mg/L | 37 ± 2 |
| Complexing compounds (recalculated as EDTA) | mg/L | 70 ± 4 |
| Zinc (Zn) | mg/L | 1534 ± 77 |
| Copper (Cu) | mg/L | <0.05 |
| Nickel (Ni) | mg/L | 0.23 ± 0.01 |
| Cadmium (Cd) | mg/L | <0.05 |
| Lead (Pb) | mg/L | <0.05 |
| Iron (Fe) | mg/L | 1.01 ± 0.05 |
| (undiluted) ASAT ** (dehydrogenase activity) | % | Complete inhibition of dehydrogenase activity |
| (1:10) ASAT ** (dehydrogenase activity) | % | Complete inhibition of dehydrogenase activity |
* parameter value ± the measurement uncertainty for an extension factor k = 2, if applicable, ** Activated Sludge Activity Test.