Table 1 Comparative water quality analysis of sullage, treated water, Dhaka WASA and Bangladesh Standard for drinking water in laboratory-scale filter system
From: Development of Low-cost indigenous filtration system for urban sullage: assessment of reusability
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 |