Table 2.
Characteristics of oil field formation water after treatment with Chlorella vulgaris BS1 for 14 days and its compliance with environmental standards for its disposal and reuse.
| Characteristics of oil field Formation water after treatment | Values | Does the treated formation water satisfy the regulatory guidelines for its disposal or reuse? | ||
|---|---|---|---|---|
| On-shore disposal (Environment Protection Rules, 1986) | Disposal by reinjection into abandoned oil well (Environment Protection Rules, 1986) | Reuse by reinjection into oil reservoirs (Recommendation Standard and Analysis Method for the Clastic Rock Reservoir Injection Water Quality) | ||
| pH | 7.2 ± 0.18 | ✓ | No regulatory limits | No regulatory limits |
| TPH (mg L−1) | 0.04 ± 0.12 | ✓ | ✓ | ✓ |
| SO4 (mg L−1) | Not detected | ✓ | No regulatory limits | ✓ |
| COD (mg L−1) | 79.2 ± 2.61 | ✓ | No regulatory limits | No regulatory limits |
| Fe (mg L−1) | 1.232 ± 1.03 | ✓ | No regulatory limits | No regulatory limits |
| Cu (mg L−1) | 0.0015 ± 1.02 | ✓ | No regulatory limits | No regulatory limits |
| Cr (mg L−1) | 0.0295 ± 0.03 | ✓ | No regulatory limits | No regulatory limits |
| Zn (mg L−1) | 0.1037 ± 0.001 | ✓ | No regulatory limits | No regulatory limits |
| Ni (mg L−1) | 0.0697 ± 0.004 | ✓ | No regulatory limits | No regulatory limits |
| Na (mg L−1) | 11.744 ± 1.21 | No regulatory limits | No regulatory limits | No regulatory limits |
| Mn (mg L−1) | 0.0026 ± 1.06 | No regulatory limits | No regulatory limits | No regulatory limits |
| Ca (mg L−1) | 33.376 ± 0.17 | No regulatory limits | No regulatory limits | No regulatory limits |
| Mg (mg L−1) | 3.3298 ± 0.013 | No regulatory limits | No regulatory limits | No regulatory limits |
| N (mg L−1) | 0.61 ± 0.04 | No regulatory limits | No regulatory limits | No regulatory limits |