27.
At many sites relic oil, petrol or diesel may be found.
|
28.
Petroleum products such as hydrocarbons...
|
29.
|
30.
Bioremediation techniques can help to break these down...
|
31.
usually working fastest with oxygen, but it's not essential.
|
32.
The longer the hydrocarbon chain, the longer it takes.
|
33.
Branched chains may take longer still...
|
34.
as will aromatic (cyclic) hydrocarbons, complex (polycyclic)...
|
35.
aromatics may be very persistent & require different treatment.
|
36.
Dry cleaning uses chlorinated solvents
|
37.
as do many industrial cleaning operations.
|
38.
Solvents lost may enter the ground
|
39.
Bioremediation of these compounds often works best
|
40.
|
41.
but may require foods such as natural organic matter,
|
42.
|
43.
|
44.
In this way these contaminants can be removed.
|
| Click on image - Cartoons created
by Loet van Moll on behalf of NICOLE, all rights
reserved." |