[show abstract][hide abstract] ABSTRACT: Petroleum based products are the current major source of energy and their transport across the world frequently result in oil spillage, contaminating the soil and water alike. There is an overwhelming need for in situ technologies that can efficiently remediate persistent contaminants from soil in a cost-effective, environmentally friendly method. In phytoremediation, plants are utilized to clean up contaminated soil, taking advantage of their natural ability to take up, accumulate and/or degrade constituents of their soil and water. Phytoremediation processes and techniques suggest their applicability to a broad range of contaminants including various organic compounds such as chlorinated solvents, BTEX (Benzene, toluene, ethylene & xylene), polycyclic aromatic hydrocarbons (PAHs), nutrients and surfactants offering a low-cost method of soil remediation technology. Chemical nature of organic contaminants, sources of contamination, microbial processes associated with plants and role of plants in PAH contaminated soil reclamation have been discussed to decipher the strategies to accomplish remediation to a large extent over short durations of exposure based on multi-process integration approaches.
Indian Journal of Science and Technology. 02/2011; 4(1).
[show abstract][hide abstract] ABSTRACT: The rhizosphere of two turf cover sorts; Bermuda grass and American grass contained high numbers, 8.1 to 16.8 x 10(6) g(-1) of cultivable oil-utilizing and diazotrophic bacteria belonging predominantly to the genera Agrobacterium, Arthrobacter, Pseudomonas, Gordonia, and Rhodococcus. Those bacteria also grew on a nitrogen-free medium and demonstrated the ability to reduce acetylene to ethylene. These isolates grew on a wide range of n-alkanes (C9 to C40) and aromatic hydrocarbons, as sole sources of carbon. Quantitative determinations revealed that predominant bacteria consumed crude oil and representative aliphatic (n-octadecane) and aromatic (phenanthrene) hydrocarbons efficiently. The fact that those organisms had the combined activities of hydrocarbon-utilization and nitrogen-fixation makes them suitable tools for bioremediating oily desert areas that are normally poor in nitrogenous compounds. Phytoremediation experiments showed that spreading turf cover on oily desert soil inhibited oil volatilization and enhanced oil loss in soil by about 15%. Oil loss was also enhanced in turf free soil samples fertilized with NH4NO3. In conclusion, covering this oil-polluted soil with turf cover minimized atmospheric pollution, increased the numbers of the oil-utilizing/nitrogen-fixing bacteria by about 20 to 46% thus, encouraging oil attenuation.
International Journal of Phytoremediation 02/2011; 13(2):156-67. · 1.18 Impact Factor
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