How do microorganisms are helpful in industry?

Sewage Treatment:
Aerobic microbes are allowed to grow in the primary effluent during the secondary stage of waste water treatment.

• These microbes consume the major part of the organic matter in the effluent

Example:
Nitrobacter sps.

• In the anaerobic treatment of sewage methanobacterium is used.

Production of Biogas:
Human and animal faecal matter and plant wastes are broken down by anaerobic bacteria to produce methane (biogas) along with carbon dioxide and hydrogen.

• These bacteria are called as methanogens.