bioremediation
Concise Oxford English Dictionary © 2008 Oxford University Press:
bioremediation /ˌbʌɪə(ʊ)rɪˌmiːdiˈeɪʃ(ə)n/
▶noun the use of either naturally occurring or deliberately introduced microorganisms to consume and break down environmental pollutants.
'bioremediation' also found in these Oxford entries:

