Question

In a biogas plant, which component is specifically designed to be an underground airtight tank where anaerobic digestion occurs?

Options

• Inlet tank

• Gas holder

• Outlet tank

• Digester

Answer 1

The digester is the underground airtight tank where anaerobic digestion of organic waste takes place. This sealed environment is critical for maintaining anaerobic conditions necessary for the growth of methanogens and other microbes that produce biogas. The absence of oxygen in the digester is essential for the fermentation process.