• Nidhi Singh
• Achal Girish

With the pollution levels on their peak and a drastic increase in water body pollution, the current scenario is taking a toll on the lives of aquatic life forms- both marine as well as fresh water. The major cause of concern is the Biological Demand for Oxygen abbreviated as BOD which refers to the amount of oxygen present per millilitre of water. BOD estimates the utilization of oxygen by the micro organisms present in the water body to break down or degrade complex organic substances into simpler compounds which is indirectly used for fulfilling their energy requirements in order to carry out various metabolic processes. As a result, it deprives the aquatic organisms of their required amount of oxygen, on in other words their oxygen supply is “cut off” and they eventually die. The major contributors of water pollution are: Industrial discharge (effluents) Domestic sewage Waste from religious gatherings Animal and human waste matter Agricultural and livestock waste Debris from natural calamities Recent studies have shown a 60-70% increase in water pollution with 45-50% attributing towards microbial contamination. Different projects have been undertaken to reduce waste water pollution and replenish the natural ecosystem of water bodies. As individuals also, measures can be adopted to curb water pollution and we can do out bit to save whatever remaining percentage potable water we have on out planet. The aim of this report is to estimate the amount of oxygen present in the water sample isolated from Palanahalli Lake (Bangalore) and therefore, determine the concentration of microbial contamination present in the selected sample. The report also focuses on the different measures that can be adopted to reduce water body adulteration.

Organic, Pollution, Colony, Adulteration, Titration, Reagents, Gram Stain, Microbe, Contamination

"Estimation of Microbial Contamination in Lake Water- A Precursor Towards Increased Biological Demand for Oxygen", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.435-438, April-2019, Available :http://www.jetir.org/papers/JETIR1904C71.pdf

"Estimation of Microbial Contamination in Lake Water- A Precursor Towards Increased Biological Demand for Oxygen", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp435-438, April-2019, Available at : http://www.jetir.org/papers/JETIR1904C71.pdf