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The mean concentration of metals in the collected sewage, along with metals disposal guidelines in Bangladesh (BSTI, 2020). Standard deviation values are indicated within the brackets. The bold letters specify the mean concentration profiles of the collected sewage exceeding the discharge guidelines.
| Parameters | Units | Concentration | BSTI (2020) |
|---|---|---|---|
| Cr | mg/L | 0.3 (0.3) | 0.1 |
| Cd | 0.04 (0.03) | 0.01 | |
| Ni | 0.2 (0.3) | 0.2 | |
| Cu | 0.1 (0.1) | 0.2 | |
| Zn | 1.2 (0.7) | 2 | |
| Pb | 0.1 (0.1) | 5 | |
| Fe | 1.4 (0.5) | 5 | |
| Mn | 0.5 (0.4) | 0.2 |
