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

The correct answer is bacterium.

Key Points

• Bacteria are the primary agents responsible for the decomposition of organic matter in domestic sewage.
• They break down complex organic compounds into simpler substances like carbon dioxide, water, and nutrients through biological processes.
• Decomposition by bacteria occurs under both aerobic (with oxygen) and anaerobic (without oxygen) conditions in sewage treatment plants.
• In the aerobic process, bacteria oxidize organic matter, while in the anaerobic process, they produce methane and other by-products.
• Bacteria play a crucial role in maintaining environmental balance by recycling nutrients and reducing organic pollution in wastewater.

Additional Information

• Biodegradable Matter: Organic substances that can be broken down by microorganisms into simpler, non-toxic forms.
• Sewage Treatment: A process that removes contaminants from wastewater, including physical, chemical, and biological treatments.
• Aerobic Treatment: A method where oxygen is supplied to bacteria to facilitate the breakdown of organic matter.
• Anaerobic Treatment: A process where bacteria decompose organic material in the absence of oxygen, often producing biogas.
• Environmental Impact: Effective sewage treatment reduces water pollution, prevents the spread of diseases, and promotes sustainable ecosystems.