keywords: Aquatic life, River Challawa, sampling, toxicity, tannery effluents
The pollution potential of untreated tannery effluents discharged from Challawa industrial estate in Kano state, Nigeria through drains and canals into Challawa River was considered in this study. Samples were collected along the canal through which tannery effluents from Challawa industrial areas are channelled to River Challawa. The first point (sample station 1) was at the confluence where the different drains converge, the second point (sample station 2) was located 200 meters from the confluence point, the third point (sample station 3) was at 200 meters from the second point and the fourth point (sample station 4) was at the point just before the effluent is discharged into the river. The samples were analyzed for electrical conductivity (EC), total dissolved solids (TDS), total suspended solid (TSS), temperature, pH, biochemical oxygen demand (BOD), chemical oxygen demand (COD), chloride, alkalinity, and sulphide. The values of the parameters ranged: 8.87-7.54 for pH, 28.1-30.1 OC for temperature; 2476-3819 mg/L for TDS; 3077 - 4102 mg/L for TSS, 1870-6473 µs/cm for EC; 71.9-148.7 mg/L for sulphide; 219.5 – 353.9 mg/L for chloride; 107.9-283.1 mg/L for BOD and 285.4-814.7 mg/L for COD. Only values of pH and temperature were within the maximum permissible limits set by the regulatory bodies. The values of sulphide, chloride, EC, TDS, TSS, COD and BOD of effluents across the four sampling stations were higher than the limits set by the regulatory bodies. This implies that, if the effluent is discharged untreated into river Challawa, it will constitute potential threat to aquatic life.
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