/ˌbaɪ.əʊ.rɪ.miː.diˈeɪ.ʃən/
a method of cleaning up pollution from oil, poisons, waste, etc. using bacteria or other small organisms that break down the substance :
break down:
to make a substance separate into parts or change into a different form in a chemical process 使分解（为）；使变化（成）
Sugar and starch are broken down in the stomach.
糖和淀粉在胃里被分解。
Bioremediation has been used in high-profile cleanups, including oil spilled from the well fires off the coast of Kuwait after the 1991 Persian Gulf War.
Researchers devised a bioremediation system that electrically stimulates bacteria to break down toxic chemicals in the environment.