Remediation of saline soils contaminated with crude oil using the halophyte Salicornia persica in conjunction with hydrocarbon-degrading bacteria
| Autor: | Maryam Hashemi, Reza Ghorbani Nasrabadi, Mohsen Olamaee, Nayer Azam Khoshkholgh Sima, Ali Ebadi |
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| Rok vydání: | 2018 |
| Předmět: |
Bioaugmentation
Environmental Engineering Soil salinity Chenopodiaceae 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Soil chemistry.chemical_compound Bioremediation Halophyte Soil Pollutants Waste Management and Disposal Soil Microbiology 0105 earth and related environmental sciences Rhizosphere Bacteria Chemistry Salt-Tolerant Plants 04 agricultural and veterinary sciences General Medicine Hydrocarbons Biodegradation Environmental Petroleum Environmental chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Phytotoxicity Total petroleum hydrocarbon Soil microbiology |
| Zdroj: | Journal of Environmental Management. 219:260-268 |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2018.04.115 |
| Popis: | The negative impact of salinity on plant growth and the survival of rhizosphere biota complicates the application of bioremediation to crude oil-contaminated saline soils. Here, a comparison was made between the remedial effect of treating the soil with Pseudomonas aeruginosa , a salinity tolerant hydrocarbon-degrading consortium in conjunction with either the halophyte Salicornia persica or the non-halophyte Festuca arundinacea . The effect of the various treatments on salinized soils was measured by assessing the extent of total petroleum hydrocarbon (TPH) degradation, the soil's dehydrogenase activity, the abundance of the bacteria and the level of phytotoxicity as measured by a bioassay. When a non-salinized soil was assessed after a treatment period of 120 days, the ranking for effectiveness with respect to TPH removal was F. arundinacea > P. aeruginosa > S. persica > no treatment control, while in the presence of salinity, the ranking changed to S. persica > P. aeruginosa > F. arundinacea > no treatment control. Combining the planting of S. persica or F. arundinacea with P. aeruginosa inoculation (“bioaugmentation”) boosted the degradation of TPH up to 5–17%. Analyses of the residual oil contamination revealed that long chain alkanes (above C20) were particularly strongly degraded following the bioaugmentation treatments. The induced increase in dehydrogenase activity and the abundance of the bacteria (3.5 and 10 fold respectively) achieved in the bioaugmentation/ S. persica treatment resulted in 46–76% reduction in soil phytotoxicity in a saline soil. The indication was that bioaugmentation of halophyte can help to mitigate the adverse effects on the effectiveness of bioremediation in a crude oil-contaminated saline soil. |
| Databáze: | OpenAIRE |
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