Title: Assessment of Water Quality Status of Turag River Due to Industrial Effluent
Authors: Parvin Aktar, Mst Sabrina Moonajilin
Volume: 1
Issue: 6
Pages: 105-118
Publication Date: 2017/08/28//
Abstract:
Industry is one of the main resources of a country's economic development. Different types of industries have different system of production. For production purpose these industries use a huge amount of chemicals and raw materials which rapidly polluted surface water of our country in the form of effluent. The aim of this study was to assess the water quality status of Turag river due to industrial effluent. This study was in Tongi heavy industrial area and investigation was done by collecting effluent from four industries and three stationery point on turag river which was selected by purposive sampling technique. The values of DO of the analyzed industrial samples are within the range of 2.32-6.28. In chemical industries DO value is lower than the standard. But in other conditions DO value is higher. DO value of the river is also lower than the Bangladesh standard. Dissolve oxygen (DO) values are found in the range from 1.85 to 4.20 mg/L . The highest value 29 6 mg/L for DO was found in 2006 decreased to 1.85 to 4.2 mg/L in the present study. Higher BOD values were found in Confluence Point of Turag river .The values BOD ranging from 13 to 73 mg/L. The permissible limit for BOD for drinking water is 0.2 mg/L, for recreation 3 mg/L, for fish 6 mg/L and 10 mg/L for irrigation. (Bangladesh standard) (DoE, Department of Environment, 1991, 1997). The biological oxygen demand (BOD) was high because most of the industries are situated near the bank of the river. They discharge organic material, e.g. from sewage treatment works, storm overflows, domestic waste water (human waste and food waste) and industrial waste water (from tannery, textile and food processing industries), agricultural slurry, silage liquor. Turag river is polluted by industrial effluent, untreated sewage, wastewater, oil dumping, silt, encroachment etc. Pollutants entering the water body are both in solid and liquid forms. Concerning all measured parameters (especially DO, BOD ), it could be concluded that pollution of Turag water reached critical point with increasing tendency day by day. This study has revealed that the industries are involved in serious environmental hazard. Adequate preventive measures should be taken in industrial activities with a view to ensuring a healthy environment.