Physicochemical investigation of surface water quality of urban wetlands of Bangalore, India

The urban aquatic ecosystems are strongly influenced by long term discharge of untreated domestic and industrial wastewater, storm water runoff, accidental spills and direct solid waste dumping. In this study, a survey of physico-chemical pollution of surface water of existing water bodies in Bangalore urban region was carried out. The findings show that total and magnesium hardness, total dissolved solids, total alkalinity, dissolved oxygen and biochemical oxygen demand exceeded desirable limits. Magnesium, chlorides and orthophosphates were also excessive. Calcium carbonate saturation indices showed that the water from the surveyed water bodies had a scale forming tendency. Pearson's coefficient correlation between the chemical contaminants showed a very strong and a statistically significant relationship between sodium, potassium, calcium, magnesium, chlorides and fluorides