Answer:
- Micro-organisms are grown on a very large scale in fermenters (bioreactors) to obtain products such as alcohol, antibiotics, enzymes, vitamins and organic acids.
- Pure cultures of selected micro-organisms are used under controlled conditions of temperature, pH, aeration and nutrients so that the product is of good quality and quantity.
- Microbes are also used to treat waste water and to produce biogas, and the products are separated and purified afterwards.