Article

Dr. D P Nagarajappa, U B D T C E; Bhimagouda Patil ,U B D T C E

The Bellandur Lake is the largest manmade lakes in Southeast Asia. Varities of pollutants have been reported to cause deterioration of water quality in Bellandur Lake. A study was carried out for An Approach to the Cause for the Foam Formation in Bellandur Lake Southwest Region, Bangalore. The water samples collected and measured at twelve locations during January-2018 to April-2018. The physic chemical parameters like pH, EC, Total Dissolved Solids, Turbidity, Sulphate, Oil and Grease, Phenols, Hexa-valent Chromium, Boron, BOD, COD, Phosphates and Nitrates, heavy metals like Fe, Cu, Zn, Ni, Pb, and microbial tests carried out during the study. The observed values of various parameters are compared with standards values recommended by BIS. The fall in water quality of Bellandur Lake is due to sewage and effluent discharge, washing cloths and utensils, religious ritual activities. Even though some parameters are within the range, parameters which help in foam production are found to be present. They have lower rate of settling. Hence, they react with chemicals present in lake water leading to formation of ignitable gases like H2S, nitrates etc. As they move on the surface of water, they mix with air and due to turbulence, foam is formed. Only 1 % of foam is formed due to foaming agent other than 99% of foam is due to air and water. Enrichment of foam due to organic and in organic components, heavy metals and chlorinated hydrocarbons. Foam catches fire due to high flammability compounds that are hydrocarbons and an organic polymer from industry. Continuous monitoring required in order protecting the lake from pollution.