Phytoremediation of Soil Contaminated with Crude Oil Using Mucuna Bracteata

Kuok Ho Daniel Tang; Yu Wei Eric Law

摘要

This study examines the ability of Mucuna bracteata DC. to remediate soil contaminated with increasing levels of crude oil up to 20%. It also investigates the effect of fertilizer application on crude oil degradation. Changes in crude oil concentrations, pH and moisture of the soil in eight experimental pots were tracked over a period of 9 weeks. The crude oil levels in soil were analysed as Total Petroleum Hydrocarbons (TPHs) using the UV-Vis spectrophotometer. The study revealed the capacity of Mucuna bracteata to phytoremediate soil contaminated with crude oil in all experimental pots though the plant died at 20% contamination towards the end of the experiment. The plant survived up to 15% contamination with that in the fertilized pot showing better physiological conditions. In all instances, fertilized pots showed higher rates of crude oil reduction. The amounts of crude oil degraded in fertilized pots were also higher except at 20% contamination. The soil pH varied over a narrow range throughout the experimental period. Moisture of soil contaminated with 15% and 20% crude oil was higher than that contaminated with 5% and 10% crude oil. Mucuna bracteata showed signs of phytoextraction which can be subject to further study. This study contributed a new candidate of phytoremediation for soil contaminated with high level of crude oil.

机译：这项研究检查了Mucuna bracteata DC的能力。修复被原油含量提高至20％的土壤。它还研究了肥料施用对原油降解的影响。在9周的时间内跟踪了八个实验罐中原油浓度，pH值和土壤湿度的变化。使用UV-Vis分光光度计将土壤中的原油含量分析为总石油烃（TPH）。该研究表明，尽管在试验结束时该植物死于20％的污染，但在所有实验盆中，毛uc菜都具有被原油污染的植物修复土壤的能力。在受精盆中，该植物能够幸存高达15％的污染物，表现出更好的生理条件。在所有情况下，受精盆显示出更高的原油减少率。受精盆中降解的原油量也更高，除了污染程度为20％。在整个实验期间，土壤的pH值在狭窄的范围内变化。受15％和20％原油污染的土壤水分高于受5％和10％原油污染的土壤水分。小菜豆（Mucuna bracteata）表现出植物提取的迹象，有待进一步研究。该研究为被高水平原油污染的土壤的植物修复提供了新的候选人。

Phytoremediation of Soil Contaminated with Crude Oil Using Mucuna Bracteata

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