1. The decaying of dead organic material into humus which serve as plant nutrients/purification.
2. The production of composite manure.
3. Conversion of atmospheric nitrogen to nitrates through ammonia and nitrites, demystification of nitrates.
4. Vinegar making from alcohol.
5. Tanning of leather
6. Pitting of flax or jute
7. Curing of tobacco
8. Butter/Cheese/Cream making
9. Making vitamin B and K in large intestine of man
10. Digestion of cellulose in ruminants
11. Turning of sewage into fertilizer
12. Vaccine making by using weakened bacteria
13. Production of biogas