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With reference to bio-toilets used by the Indian Railways, consider the following statements:

  1. The decomposition of human waste in the bio-toilets is initiated by fungal inoculums.
  2. Ammonia and water vapour are the only end products in this decomposition which are released into the atmosphere.
Which of the statements given above is/are correct?
  1. 1 only
  2. 2 only
  3. Both 1 and 2
  4. Neither 1 nor 2

Explanation

Both statements are incorrect
  • Anaerobic bacteria carry out the decomposition of human waste in bio-toilets.
  • The decomposition process produces gases like methane and carbon dioxide, along with water. The treated effluent (liquid) is discharged after disinfection. Hence, ammonia and water vapour are not the only end products.

Diagram illustrating bio-toilets and anaerobic biodegradation process, showing conversion of human waste into water, gases, and methane. Key components include bio-toilet, bio-tank with bacteria sheets, methane gas outlet, and water outlet, alongside a flowchart detailing breakdown of organic materials through hydrolysis, acidogenesis, acetogenesis, and methanogenesis stages.

Answer: (d) Neither 1 nor 2; Difficulty Level: Medium
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