Question:

BOD of waste water is estimated by measuring the amount of

Updated On: Jul 6, 2022
  • Total organic matter
  • Biodegradable organic matter
  • Oxygen evolution
  • Oxygen consumption
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The Correct Option is D

Solution and Explanation

Degree of impurity of water due to organic matter is measured in terms of BOD. It is the oxygen in milligrams required for five days in one litre of water at 20?C for the microorganisms to metabolise organic waste.
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Notes on Microbes in human welfare

Concepts Used:

Microbes in Human Welfare

There are several valuable microorganisms that are beneficial to humans in various manners such as:

In Household Products

  1. Fermentation of milk to produce yogurt.
  2. Milk cuddling to compose curd, cheese, and paneer.

In Industrial Products

  1. Production of beverages such as wine, beer, whiskey, brandy, or rum.
  2. Production of antibiotics such as Penicillin and other chemical substances to kill or retard the expansion of disease-causing microbes.

Fermented Beverages

  1. A fermentor is used to produce microbes on a large scale for industrial purposes.
  2. The brewer’s yeast (Saccharomyces cerevisiae) is used to make ethanol. At this time, the yeast ferments malted cereals and fruit juices.

Antibiotics

  1. The term antibiotic means “against life”. These materials can kill or destroy the growth of other microbes.