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Study the following statements and select the incorrect ones.
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas, commonly called as gobar gas, is pure methane.
  • a)
    (i) and (ii)
  • b)
    (ii) and (iv)
  • c)
    (ii) and (iii)
  • d)
    (iii) and (iv)
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Study the following statements and select the incorrect ones.(i) Physi...
Secondary treatment is also called biological treatment or microbial degradation. It is mainly a biological process. Biogas is a mixture of gases, containing predominantly methane (50-70%), CO2 (30-40%) and traces of hydrogen, H2S and nitrogen.
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Most Upvoted Answer
Study the following statements and select the incorrect ones.(i) Physi...
Incorrect Statements:

Statement (ii): Secondary sewage treatment is mainly a mechanical process.
- Secondary sewage treatment involves biological processes such as activated sludge, trickling filters, or rotating biological contactors. These processes use microorganisms to break down organic matter in the sewage.
- Mechanical processes are more common in primary sewage treatment, which involves physical processes like screening, grit removal, and sedimentation.

Statement (iv): Biogas, commonly called as gobar gas, is pure methane.
- Biogas, also known as gobar gas in some regions, is a mixture of gases produced by the breakdown of organic matter in the absence of oxygen. It typically consists of methane (50-70%), carbon dioxide (30-40%), and small amounts of other gases like hydrogen sulfide.
- Pure methane is not commonly found in biogas as it is usually mixed with other gases during the fermentation process.
Therefore, the incorrect statements are (ii) and (iv), making option (b) the correct choice.
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Study the following statements and select the incorrect ones.(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.(ii) Secondary sewage treatment is mainly a mechanical process.(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.(iv) Biogas, commonly called as gobar gas, is pure methane.a)(i) and (ii)b)(ii) and (iv)c)(ii) and (iii)d)(iii) and (iv)Correct answer is option 'B'. Can you explain this answer?
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