Table 1.
Analysis of industrial wastewater collected from different industrial regions of Egypt.
| Industry | Region | Metal analysis (mg L−1) |
||
|---|---|---|---|---|
| Ni2+ | Cr6+ | Zn2+ | ||
| Steel Wool | 10th of Ramadan | 25.16 | 3.1 | 5.84 |
| High voltage | 10th of Ramadan | 31.50 | 2.0 | 6.01 |
| Electric | 10th of Ramadan | 18.22 | 3.15 | 3.15 |
| Painting | 10th of Ramadan | 2.09 | 7.25 | 9.74 |
| Food | 10th of Ramadan | 0.85 | 1.80 | 1.91 |
| Steel | Gesr El Suez | 20.25 | 4.2 | 6.05 |
| Precise industries | Gesr El Suez | 11.38 | 3.0 | 4.00 |
| Printing | Gesr El Suez | 6.82 | 2.90 | 4.02 |
| Chemical and medical | Badr City | 4.59 | 4.13 | 6.51 |
| Electromechanical engineering | 6th of October | 29.16 | 5.06 | 3.00 |
| Electric | Shubra El-Kheima | 18.41 | 7.41 | 4.83 |
| Electric | Sadat City | 24.36 | 3.98 | 2.77 |
| Electric | Borg El-Arab | 17.91 | 4.25 | 5.47 |
| Chloride | Abu Rawash | 8.15 | 4.99 | 5.00 |
| Medical supplies | free zone, Nasr city | 2.90 | 2.80 | 6.10 |
| Food | El-Amerya | 0.27 | 1.50 | 2.00 |
| Threshold limit values of discharge heavy metals into: | ||||
| Underground reservoir, Nile and canals (Law 48/82) | 0.1 | 0.05 | 1 | |
| Sewage system (Law 44/2000) | 1.0 | 0.05 | 2 | |
| Coastal environment (Law 4/94) | 0.1 | 0.05 | 2 | |