Introduction
Materials and methods
Development of laboratory-scale filter
Development of real-scale filter
Treatment procedure through the real-scale filter
Determination of water quality parameters
Results and discussion
Water quality analysis on laboratory scale
DWASA water quality
Water quality parameters | Unit | Dhaka WASA | Sullage | Treated water | Bangladesh standards for drinking water | WHO standards for drinking water |
---|---|---|---|---|---|---|
pH | - | 6.58 | 6.52 | 7.10 | 6.5-8.5 | 6.5-8.5 |
NO3
1−
| mg/L | 4.89 | 13.89 | <3.0 | 10 | 0.45 |
PO4
3−
| mg/L | 0.25 | 5.56 | 0.97 | 6 | 0.01 |
BOD5
| mg/L | 0.68 | 5.28 | 4.88 | 0.2 | 0.2 |
DO | mg/L | 7.02 | 0.98 | 5.96 | 6 | 6 |
Cl−
| mg/L | Nil | Nil | Nil | 0.2 | 0.2 |
Pb2+
| mg/L | <0.01 | <0.01 | <0.01 | 0.01 | 0.01 |
Cr6+
| mg/L | <0.005 | <0.005 | <0.005 | 0.05 | 0.05 |
Cd2+
| mg/L | <0.001 | <0.001 | <0.001 | 0.005 | 0.003 |
Hg2+
| mg/L | <0.001 | <0.001 | <0.001 | 0.001 | 0.001 |
As | mg/L | <0.005 | <0.005 | <0.005 | 0.05 | 0.01 |
Total coliform | Number/100 mL | 2.3 ×104
| 2.45 ×105
| 0 | 0 | 0 |
Fecal coliform | Number/100 mL | 0 | 0 | 0 | 0 | 0 |
Sullage water quality test analysis
Treated sullage water quality test analysis
Analysis of heavy metals
Water quality analyses on real-scale
Water quality parameters | Unit | Dhaka WASA | Concentration present in sullage | Concentration present after treatment | Bangladesh standard for DW | WHO Standards for drinking water |
---|---|---|---|---|---|---|
TDS | mg/L | 465 | 667 | 523 | 1000 | 500 |
TSS | mg/L | 419 | 522 | 14 | 10 | 10 |
NO3
1−
| mg/L | 4.89 | 13.89 | 0.42 | 10 | 0.45 |
PO4
3−
| mg/L | 0.25 | 5.56 | 2.28 | 6 | 0.01 |
BOD5
| mg/L | 0.68 | 5.28 | 0.14 | 0.2 | 0.2 |
Total coliform | Number/100 mL | 2.3 ×104
| 2.45 ×105
| 0 | 0 | 0 |
Fecal coliform | Number/100 mL | 0 | 0 | 0 | 0 | 0 |