A Study on the water quality assessment of Yele Mallappa Shetty Lake of Bengaluru, Karnataka
K. Harish Kumar
Department of Environmental Science, Government First Grade College, Hoskote, Bengaluru-562114 Karnataka (India)
ABSTRACT
The seasonal variations in various physico-chemical parameters like water temperature, electrical conductivity, Turbidity, pH, alkalinity, total hardness, DO, BOD, COD, sodium, potassium, phosphate and nitrate levels ofwater of Yele Mallappa Shetty Lake of Bengaluru, Karnataka was studied during January to December 2020 and the results obtained during the analysis were compared with WHO and BIS standards. The lake temperature ranged between 22OC (Winter)- 29°C (Summer).pH of the present water body ranged between 7.5 to 8.2 as against the standard of 6.5-8.5.EC was minimum in rainy season (402 mg/l) and maximum in Winter season ( 860 mg/l). Turbidity values ranged from 12 to 49 NTU. DO and BOD levels fluctuated from 2.6- 5.4 mg/l and 82-294 mg/l respectively.Maximum alkalinity of 348 mg/l was recorded as against the standard 300 mg/l. COD level was maximum with 900 mg/ l was recorded in summer due the presence of high dissolved contaminants. Lake water belongs to hard category. Sodium data varied from 135 to 270 mg/l. Potassium was minimum than the sodium levels. Nutrients like phosphate and nitrate levels fluctuated between 1.8-8.2 mg/l and 2.4-5.5 mg/l respectively. The results of the present studyare reflect the deteriorating the lake. This study may helpful for the authorities to protect the lake water resources and keep theirimpurity level under check so that it can be used during the crisis. The study will also help in bringing awareness among the people living near the lake to keep the environment clean and greenary.