IMPACT OF REFINERY EFFLUENT ON WATER QUALITY AND PLANKTON COMPOSITIONS OF KALIANI AND DHANSIRI RIVERS OF ASSAM, INDIAJANMONI MORANAbstract An ecological health assessment was carried out for two years in the two rivers âDhansiri and Kaliani of Golaghat district of Assam affected by effluent of the Numaligarh refinery. The river sections were divided into two areas- control area and contaminated area. Some of the selected physiochemical parameters were water temperature, Conductivity, pH, TDS, Turbidity, Total alkalinity, Dissolved Oxygen (DO), Calcium hardness etc. The abundance and density of phytoplankton and zooplankton were calculated and compared between the control area and contaminated area. In the study, a distinct fluctuation was observed in both physiochemical parameters and bio-community structures of the two rivers. |