The primary agent that helps in the decomposition of biodegradable matter in domestic sewage is __________.

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RRB JE ECE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. chloride
  2. nitrate
  3. bacterium
  4. phosphate

Answer (Detailed Solution Below)

Option 3 : bacterium
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The correct answer is bacterium.

Key Points

  • Bacteria play a crucial role in the decomposition of biodegradable matter in domestic sewage.
  • They break down organic compounds into simpler substances, which can be further processed and removed from the sewage.
  • Different types of bacteria are involved in various stages of sewage treatment, including aerobic and anaerobic bacteria.
  • Aerobic bacteria require oxygen to break down organic matter, while anaerobic bacteria do not.
  • Effective sewage treatment relies on maintaining the right balance and environment for these bacteria to thrive.
  • This biological process helps in reducing the BOD (Biochemical Oxygen Demand) of the sewage, making it safer to release into the environment.

 Additional Information

  • Chloride
    • Chloride is primarily used in water treatment for disinfection and killing harmful pathogens.
    • It does not play a role in the decomposition of organic matter in sewage.
  • Nitrate
    • Nitrate is a compound that can be formed during the decomposition process, but it is not an agent of decomposition itself.
    • High levels of nitrates in water can lead to environmental issues such as eutrophication.
  • Phosphate
    • Phosphate is another compound that can be found in sewage, often from detergents and fertilizers.
    • Like nitrate, it is not involved in the decomposition process but can contribute to water pollution if not properly managed.
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