Impact of industrial pollution and seasonality on physicochemical and biological parameters of surface water around the BISIC industrial area of Rajshahi City, Bangladesh
- 1Department of Botany, Kushtia Govt. College, Kushtia, Bangladesh
- 2Department of Applied Nutrition and Food Technology, Islamic University, Kushtia-7003, Bangladesh
Int. Res. J. Environment Sci., Volume 7, Issue (12), Pages 40-55, December,22 (2018)
The present study has been carried out to investigate the effects of industrial pollution and seasonal changes on physicochemical and biological parameters of surface water from November 2014 to May 2018 of Bangladesh Small Cottage Industry Corporation (BSCIC), Rajshahi, Bangladesh. Three different water body sites indicated as spot-I, spot-II, and spot-III of BSCIC were selected owing to the proximity of the wastes thrown by the industries. Spot-I is a drain which is connected to the central drainage system of BSCIC. Spot-II is a pond which receives wastes only during the rainy season whereas Spot-III is a large canal and is connected to the two main drainage systems of Rajshahi City Corporation. Water samples were collected at monthly intervals from a depth of 20-30 cm below the surface from the study sites. Water quality parameters viz., physical (air and water temperature, transparency of water), chemical (pH, dissolved oxygen, HCO3 alkalinity and free CO2, total hardness, Ca- and Mg-hardness, total phosphate and nitrate, percent of saturation of oxygen, redox potential (Eh), BOD5 and COD), and biological (phytoplankton and zooplankton, and total coliform bacteria) of the sites were evaluated. Pearson correlations analysis was used to find out the relationships among physical, chemical and biological parameters during all periods investigated. Anoxic conditions were found at spot-II and -III. The most important parameters of pollution like hardness, BOD5, COD and coliform counts were higher at spot-I and -III compared to spot-II. Therefore, this study reveals that spot-I and -III were highly polluted compared to spot-I where moderate levels of pollution were observed.
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