Table 3.
Physico-chemical and microbiological characterization of oily sludge sample.
| Parameters | Values |
|---|---|
| pH | 6–6.5 |
| Temperature (°C) | 44.9 |
| Dissolved oxygen (mg/l) | 0.19 |
| Oxidation reduction potential (mV) | -30 |
| Conductivity (μ Siemens/cm) | 1.4 |
| Moisture content (%) | 9 |
| Oil and gas content (%, w/w) | 90.3 |
| Total organic carbon (TOC) (g/kg) | 200 ± 105.2 |
| TPH (g/kg) | 400 ± 47.22 |
| Nitrate (mg/kg) | 7.875 ± 4.62 |
| Ammonium (mg/kg) | 17 ± 5.33 |
| Nitrite (mg/kg) | <2.0 |
| Chloride (mg/kg) | 469.85 |
| Sulfate (mg/kg) | 73.61 |
| Phosphate (mg/kg) | 35 ± 10 |
| Heavy metals | |
| As (mg/kg) | 1.279 ± 1.25 |
| Cd (mg/kg) | 0.16 ± 1.91 |
| Co (mg/kg) | 2.39 ± 1.68 |
| Cr (mg/kg) | 8.07 ± 1.39 |
| Fe (mg/kg) | 302.97 ± 2.56 |
| Na (mg/kg) | 2.23 ± 2.11 |
| Ni (mg/kg) | 7.11 ± 1.63 |
| Pb (mg/kg) | 4.02 ± 2.5 |
| V (mg/kg) | 2.84 ± 1.69 |
| Zn (mg/kg) | 131 ± 2.02 |
| Microbial counts (CFU gram-1) | |
| Aerobic in R2A medium | 5–8 × 106 |
| Anaerobic agar medium | 2 × 102 |
| Hydrocarbon composition | |
| Aliphatics (%) | 95.52 |
| Aromatics (%) | 4.48 |