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| Titel |
Characterisation of the rhizoremediation of petroleum-contaminated soil: effect of different influencing factors |
| VerfasserIn |
J. C. Tang, R. G. Wang, X. W. Niu, M. Wang, H. R. Chu, Q. X. Zhou |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 12 ; Nr. 7, no. 12 (2010-12-03), S.3961-3969 |
| Datensatznummer |
250005102
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| Publikation (Nr.) |
 copernicus.org/bg-7-3961-2010.pdf |
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| Zusammenfassung |
| Pilot experiments were conducted to analyse the effect of different
environmental factors on the rhizoremediation of petroleum-contaminated
soil. Different plant species (cotton, ryegrass, tall fescue and alfalfa),
the addition of fertilizer, different concentrations of total petroleum
hydrocarbons (TPH) in the soil, bioaugmentation with effective microbial
agents (EMA) and plant growth-promoting rhizobacteria (PGPR) and
remediation time were tested as influencing factors during the
bioremediation process of TPH. The results show that the remediation process
can be enhanced by different plant species. The order of effectiveness of
the plants was the following: tall fescue > ryegrass > alfalfa >
cotton. The degradation rate of TPH increased with increased fertilizer
addition, and a moderate urea level of 20 g N (Nitrogen)/m2 was best
for both plant growth and TPH remediation. A high TPH content is toxic to
plant growth and inhibits the degradation of petroleum hydrocarbons. The
results showed that a 5% TPH content gave the best degradation in soil
planted with ryegrass. Bioaugmentation with different bacteria and PGPR
yielded the following results for TPH degradation: cotton+EMA+PGPR >
cotton+EMA > cotton+PGPR > cotton > control. Rapid degradation of TPH
was found at the initial period of remediation caused by the activity of
microorganisms. A continuous increase of degradation rate was found during
the 30–90 days period followed by a slow increase during the 90–150 days
period. These results suggest that rhizoremediation can be enhanced with the
proper control of different influencing factors that affect both plant
growth and microbial activity in the rhizosphere environment. |
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