Chairman: Prof. D. P. Giridhar & Dr. T. V. Ramachandra
lakes namely Bellandur and Allasandra were considered for the present study.
These two lakes are located in the outskirts of Bangalore City and cover an area
of 17.42 and 144 hectares respectively. The lake water, sediment and nearby
groundwater samples were collected and analysed for physical, chemical and
biological parameters and heavy metals as per the standard methods.
Concentration of copper, lead, Cadmium, nickel, manganese and chromium were
analysed using atomic absorption spectrophotometer. Elevated concentration of
TDS were recorded in both the lakes i.e., 888 in Allasandra lake and 666 in
Bellandur lake and 1080 and 3254 mg/L respectively for the groundwater near the
lakes. The heavy metals in the lake sediment are within the limits. But the lake
water and groundwater comes under poor quality for organised community water
supplies and hence requires intensive physical and chemical treatment i.e.,
chlorination, aeration, chemical precipitation, coagulation,
flocculation, settling, filtration and adsorption. The study has revealed that
the lakes were polluted because of untreated municipal wastewater joining the
Environmental Engineering, Department of Civil Engineering,
Bangalore University, Bangalore.
Department of Civil Engineering, Bangalore University, Bangalore.