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Phytoremediation of Petroleum‐Contaminated Soils byVetiveria zizanioides(L.) Nash
Phytoremediation of petroleum and its derivatives has frequently been regarded as a practical, eco‐friendly alternative to the clean‐up of petroleum‐contaminated soils. In this study,Vetiveria zizanioides(L.) Nash (vetiver) is shown to efficiently remediate two petroleum‐contaminated soils; fresh contamination (FC) with 3500 mg kg−1aliphatic petroleum hydrocarbons (APH), and aged contamination (AC) with 700 mg kg−1. An 88.5% reduction in the concentration of APH is observed in both contaminated soils where vetiver are grown for 15 months. Vetiver vegetation also doubled (FC) and tripled (AC) the bioavailability of contaminants as compared with unvegetated soils, as determined by the release of APH into the soil solution. The carbon availability index increased in both vegetated soils (≈1), and the microbial biomass carbon shows a three‐ and five‐fold increase in vegetated soils FC and AC, respectively, leading to a fourfold decline in the metabolic quotient. The mRNA level ofnosZ gene increased significantly in the soils under vetiver vegetation, and was correlated with the accumulation of APH in the soil solution; this probably demonstrates the role of hydrocarbon bioavailability in promoting biological processes and biodegradation. It is concluded that vetiver vegetation increased hydrocarbons bioavailability and hence raised the extent of biodegradation hydrocarbons in the soil.
Phytoremediation of Petroleum‐Contaminated Soils byVetiveria zizanioides(L.) Nash
Phytoremediation of petroleum and its derivatives has frequently been regarded as a practical, eco‐friendly alternative to the clean‐up of petroleum‐contaminated soils. In this study,Vetiveria zizanioides(L.) Nash (vetiver) is shown to efficiently remediate two petroleum‐contaminated soils; fresh contamination (FC) with 3500 mg kg−1aliphatic petroleum hydrocarbons (APH), and aged contamination (AC) with 700 mg kg−1. An 88.5% reduction in the concentration of APH is observed in both contaminated soils where vetiver are grown for 15 months. Vetiver vegetation also doubled (FC) and tripled (AC) the bioavailability of contaminants as compared with unvegetated soils, as determined by the release of APH into the soil solution. The carbon availability index increased in both vegetated soils (≈1), and the microbial biomass carbon shows a three‐ and five‐fold increase in vegetated soils FC and AC, respectively, leading to a fourfold decline in the metabolic quotient. The mRNA level ofnosZ gene increased significantly in the soils under vetiver vegetation, and was correlated with the accumulation of APH in the soil solution; this probably demonstrates the role of hydrocarbon bioavailability in promoting biological processes and biodegradation. It is concluded that vetiver vegetation increased hydrocarbons bioavailability and hence raised the extent of biodegradation hydrocarbons in the soil.
Phytoremediation of Petroleum‐Contaminated Soils byVetiveria zizanioides(L.) Nash
CLEAN Soil Air Water
Rajaei, Saeideh (author) / Seyedi, Seyed Mahdi (author)
2018-08-01
Article (Journal)
Electronic Resource
English
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