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Analysis of Water in Ulsoor Lake

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The National Green Tribunal (NGT) has directed the constitution of a joint committee to take samples of water from Bengaluru’s Ulsoorlake and neighboring areas.

It has been reported that the water quality has come down due to illegal activities being carried out while discharging untreated sewage, effluents and the dumping of garbage into the water body.

Such activities affect the quality of the water and the ecology and aquatic life, much required for ecological sustenance.

Biochemical Oxygen Demand

BOD is the amount of dissolved oxygen used by microorganisms in the biological process of metabolizing organic matter in water.

The more organic matter there is (e.g., in sewage and polluted bodies of water), the greater the BOD; and the greater the BOD, the lower the amount of dissolved oxygen available for higher animals such as fishes. The BOD is, therefore, a reliable gauge of the organic pollution of a body of water. One of the main reasons for treating wastewater prior to its discharge into a water resource is to lower its BOD—i.e., reduce its need for oxygen and thereby lessen its demand from the streams, lakes, rivers, or estuaries into which it is released.

Chemical Oxygen Demand:-

COD is a method of estimating how much oxygen would be depleted from a body of receiving water as a result of bacterial action.


Water pollution caused by fecal contamination is a serious problem due to the potential for contracting diseases from pathogens (disease-causing organisms). The presence of pathogens in the water is determined with indirect evidence by testing for an “indicator” organism such as coliform bacteria. Coliforms are bacteria that are always present in the digestive tracts of animals, including humans, and are found in their wastes. They are also found in plant and soil material. Presence of any heavy metals like Arsenic, Phosphorus. Heavy metals are known to induce cardiovascular diseases, developmental abnormalities, neurologic and neurobehavioral disorders, diabetes, hearing loss, hematologic and immunologic disorders. Studies have shown that toxic heavy metals can interfere with the absorption and use of nutritionally essential metals such as iron, calcium, copper, and zinc.

Source: TH

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