Physico-Chemical Properties of Tannery and Textile Effluents and Surface Water of River Buriganga and Karnatoli, Bangladesh

The physico-chemical properties of tannery and textile effluents and water of adjacent river (Buriganga and Karnatoli, Dhaka) at three different locations were studied. The physico-chemical properties such as Biological OxygenDemand (BOD), salinity, Total Dissolved Solid (TDS), Total Suspended Solid (TSS), Sodium (Na ), Potasium (K ), Calcium (Ca ), Iron (Fe ), Phophate (PO ), Chloride (Cl ), Nitrite (NO ) and Nitrate + + 2+ 3+ 4 2 (NO ) of tannery effluent were 92.12-100.6, 4.05-5.83, 3200-5355, 850-1103.9, 1737.62-1835.0, 65.5-72, 188.5-273.1, 3 0.26-0.32, 50.85-66.88, 79.4188.79, 0.66-1.22 and 0.48-4.63 mg/l, respectively whereas in textile effluent, the sevalues were 46.9-58.5, 0.75-1.03, 984.0-1148, 872.75-1282.4, 390.0-411.1,12.4-31.0, 37.21-54.82, 0.12-0.18, 18.2519.88, 72.21-135.87, 0.07-0.74 and 0.47-1.02 mg/l, respectively. Anions in the effluent showed a decrease in concentration with distance from point source. The concentration of the parameters in the surface water of tannery adjacent to river Buriganga were 25.58-36.87, 0.3-0.56, 175.0-259.5, 170.0-531.5, 55.5-91.0, 25.0-40.5, 13.8426.84, 0.032-0.088, 1.08-2.32, 59.4-69.18, 0.22-0.37 and 0.43-0.91 mg/l, respectively whereas in the surface water of textile adjacent to river Karnatoli the values were 24.5-37.5, 0.0-0.5, 90.7-180.0, 78.35-111.8, 8.6-177.7, 3.18-9.0, 18.1-24.46, 0.0-0.038, 0.54-0.81, 17.18-33.53, 0.14-0.31 and 0.45-1.16 mg/l, respectively. In conclusion, all the parameters in the tannery and textile effluents were higher than the DoE Standard recommended for open water, however, except BOD these values were lower in the surface water of Buriganga and Karnatoli rivers. 5