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

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.