Table 3.
The mean composition of the sludge accumulated in the first settling chamber. Standard deviation values are presented within the brackets.
| Parameters | Units | Concentration | |
|---|---|---|---|
| Common pollutant | pH | – | 8.0 (0.6) |
| COD | 4326.0 (934.9) | ||
| NH4–N | mg/L | 115.8 (79.8) | |
| NO2–N | 2.4 (1.6) | ||
| NO3–N | 478.8 (455.3) | ||
| TN | 727.1 (523.5) | ||
| TP | 1307.6 (553.7) | ||
| TSS | 20,293 (9633.0) | ||
| Coliform | CFU/100 mL | 45,980.0 (16,330.0) | |
| Metals | Cr | mg/L | 0.7 (0.4) |
| Cd | 0.4 (0.2) | ||
| Ni | 1 (0.3) | ||
| Cu | 4.8 (1.5) | ||
| Zn | 170.5 (32.2) | ||
| Pb | 1.4 (0.3) | ||
| Fe | 17.6 (1.7) | ||
| Mn | 13.2 (3.6) |