Question

The BOD values of four samples of water A,B,C and D are165ppm,120ppm,20ppm and 5ppm respectively. The most polluted water samples are

Answer 1

Answer:

The most pollute water body would be A.

Explanation:

Clean water would have BOD less than 5ppm.

Answer 2

Answer:

The most polluted sample is Sample A - $165ppm$.

Explanation:

The amount of oxygen dissolved in water that microorganisms require to oxidize inorganic and organic molecules is referred to as BOD.

More BOD signifies more contaminated water. If the BOD level exceeds $17$parts per million, the water is considered contaminated.

BOD value :

The BOD value is generally given in milligrams of oxygen used per litre of sample over a $5$ day incubation period at $20^0 C$, and it is frequently used as a surrogate for the degree of organic pollution in water.

BOD is a metric that can be used to assess the efficacy of wastewater treatment plants.