1. Preferential dissolving of mineral constituents in concentrations of ore.

2. Liquefaction of organic waste materials by action of microbes.

3. Separation of fabric from tires by the use of hot sodium hydroxide.

4. Removing lignin from wood in manufacture of chemical cellulose paper pulp.

The process of sewage treatment by the anaerobic decomposition of organic matter.

The process of converting food to an absorbable form by breaking it down to simpler chemical compounds.