Environmental Engineering Reference
In-Depth Information
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Fig. 9.1
Decrease of petroleum pollution concentration (%) in the polluted soils after bioremedia-
tion by
Amaranthus retroflexus
and its rhizospheric fungal strains. All pots contained 5 % w/w
petroleum pollution before the beginning of experiment. Data indicates amount of petroleum pol-
lution decreased due to bioremediation. Decrease of petroleum in control pots is the result of evap-
oration. Decrease of pollution between experimental and control groups are significant (
P
< 0.01).
Each data represents the mean ± SE of five samples
1.7
Bioremediation by Root Associated Fungi
The perennial herb
A. retroflexus
is one of the common plants in the polluted areas
of Kermanshah Petroleum site and could grow effectively on such soils. It propa-
gates by means of seeds and underground gemma. After 6 months bioremediation
using plants and their root associated fungal strains, concentrations of petroleum
pollution were determined in the soil of controls and contaminated soils. The data
showed that concentration of petroleum pollution decreased considerably in the all
pots but was constant in control ones (Fig.
9.1
). It also showed that decrease in the
experimental pots containing plant together with all fungal strains was more than
other groups (up to 80 %). Meanwhile, decrease of petroleum pollution was also
considerable in the pots containing plant added
Fusarium equiseti
and
F. reticula-
tum
(up to 74 and 78 %). The data showed that all fungal species were capable to
decrease petroleum pollution solitary (Fig.
9.1
), but they were more effective when
