Question:
Secondary sewage treatment is mainly a
Secondary sewage treatment is mainly a
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The microbes function to reduce the waste toxicity tested by measuring the BOD.
Updated On: Sep 12, 2022
- physical process
- mechanical process
- chemical process
- biological process
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The Correct Option is D
Solution and Explanation
The treatment of sewage is a biological process because it involves the treatment of microorganisms.
- The microbes function to reduce the waste toxicity tested by measuring the BOD (biological oxygen demand) and COD (chemical oxygen demand) value of the water.
- The microbes help to treat the sludge that is produced by the wastewater.
- Therefore, it is called a biological process.
Option A:
A physical includes gradual change through transient states. The treatment of sewage water is not a physical process.
Option B:
No objects interact to generate mechanical energy in secondary sewage treatment.
Option C:
Treatment of sewage is not a chemical process as a change in chemical state or production of different chemicals is not involved.
Therefore Option D is correct - Secondary sewage treatment is mainly a biological process.
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There are several valuable microorganisms that are beneficial to humans in various manners such as:
In Household Products
- Fermentation of milk to produce yogurt.
- Milk cuddling to compose curd, cheese, and paneer.
In Industrial Products
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- Production of antibiotics such as Penicillin and other chemical substances to kill or retard the expansion of disease-causing microbes.
Fermented Beverages
- A fermentor is used to produce microbes on a large scale for industrial purposes.
- The brewer’s yeast (Saccharomyces cerevisiae) is used to make ethanol. At this time, the yeast ferments malted cereals and fruit juices.
Antibiotics
- The term antibiotic means “against life”. These materials can kill or destroy the growth of other microbes.