Table 1 Physicochemical analysis of the collected sludge samples
Analysis type | Unit | Samples | |||
|---|---|---|---|---|---|
S1 | S2 | S3 | S4 | ||
Turbidity | NTU | 4000 | 5800 | 18462 | 4500 |
Temperature | °C | 22.4 | 15.5 | 27.6 | 25.2 |
pH | - | 6.9 | 7.4 | 7.3 | 7.0 |
TDS | mg/l | 310 | 320 | 340 | 308 |
Electric conductivity | Us/cm | 470 | 512 | 530 | 465 |
Total alkalinity | mg/l | 612 | 480 | 130 | 530 |
Total hardness | mg/l | 520 | 540 | 150 | 350 |
Permanent hardness | mg/l | 92 | 60 | 20 | 50 |
Temporary hardness | mg/l | 520 | 480 | 130 | 358 |
Calcium hardness | mg/l | 416 | 300 | 102 | 250 |
Magnesium hardness | mg/l | 104 | 240 | 48 | 180 |
F | mg/l | 2.0 | 0.3 | 2.5 | 0.2 |
SO42 | mg/l | 40.0 | 39.0 | 50.0 | 35.0 |
PO4 | mg/l | 0.025 | 19 | 5.98 | 18.0 |
NO2 | mg/l | 0.002 | 0.01 | 0.05 | 0.01 |
NO3 | mg/l | UDL | UDL | UDL | UDL |
Ca | PPM | 166.0 | 120.0 | 40.8 | 118.0 |
Mg | PPM | 25 | 57.6 | 11.52 | 55.0 |
Al | PPM | 0.31 | 3 | 0.62 | 0.55 |
Fe | PPM | 0.18 | 8.03 | 2.8 | 0.36 |
Li | PPM | 0.004 | 0.20 | 0.426 | 0.005 |
B | PPM | 2.899 | 1.8 | 4.295 | 2.0 |
Na | PPM | 143.042 | 122.0 | 106.124 | 111.0 |
K | PPM | 1.015 | 5.0 | 6.914 | 4.0 |
Ti | PPM | 2.474 | 8.0 | 19.640 | 2.1 |
Cr | PPM | 0.099 | 1.2 | 0.472 | 0.9 |
Mn | PPM | 0.306 | 1.3 | 18.163 | 0.5 |
Co | PPM | 0.003 | 1.5 | 6.562 | 1.8 |
Ni | PPM | 0.023 | 1.3 | 0.480 | 1.5 |
Cu | PPM | 0.013 | 5.2 | 11.086 | 2.2 |
Zn | PPM | 0.336 | 4.4 | 7.839 | 4.2 |
Ga | PPM | 0.006 | 0.01 | 0.633 | 0.5 |
Sr | PPM | 0.079 | 0.6 | 6.914 | 0.2 |
Ag | PPM | 0.004 | 1.2 | 6.968 | 0.8 |
Cd | PPM | 0.000 | 1.3 | 9.640 | 0.9 |
In | PPM | 0.000 | 0.1 | 0.472 | 0.1 |
I | PPM | 1.263 | 2.0 | 8.163 | 1.9 |
Ba | PPM | 0.186 | 1.0 | 2.649 | 0.9 |
Hg | PPM | 0.017 | 0.11 | 0.562 | 0.2 |
Pb | PPM | 0.009 | 0.02 | 0.480 | 0.1 |
Bi | PPM | 0.008 | 0.3 | 1.086 | 0.01 |
BOD | PPM | 56.0 | 55.0 | 110 | 35.0 |
COD | PPM | 120 | 112.0 | 198 | 100.0 |
COD/BOD | - | 2.1 | 2.03 | 1.8 | 2.8 |