Table 1.
The mean concentration of environmental parameters and common pollutant of the collected sewage, along with sewage disposal guidelines in Bangladesh (ECR, 2023). 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 | Unit | Concentration | ECR (2023) |
|---|---|---|---|
| pH | – | 7.8 (0.5) | 6–9 |
| Eh | mV | 112.9 (71.8) | – |
| NH4–N | mg/L | 43.6 (15.2) | – |
| NO2–N | 0.5 (0.5) | – | |
| NO3–N | 10.4 (10.2) | 50 | |
| TN | 84.3 (18.1) | – | |
| TP | 227.8 (168.3) | 15 (as PO4) | |
| BOD | 417.1 (142.6) | 30 | |
| COD | 1552.5 (322.2) | 125 | |
| Suspended solids | 396.8 (447.9) | 100 | |
| Coliform | CFU/100 mL | 59,109 (22,147) | 1000 |