Bioremediation is one of the existing techniques applied for treating oil-contaminated soil, which can be improved by the incorporation of low-cost nutritional materials. This study aimed to assess the addition of two low-cost plant residues, sugarcane bagasse (SCB) and leaf litter (LL) of the forest leguminous Mimosa caesalpiniifolia plant (sabiá), either separately or combined, to a contaminated soil from a petroleum refinery area, analyzed after 90 days of treatment. Individually, both amounts of SCB (20 and 40 g kg-1) favored the growth of total heterotrophic bacteria and total fungi, while LL at 20 g kg-1 better stimulated the hydrocarbon-degrading microorganism's activity in the soil. However, no TPH removal was observed under any of these conditions. Higher microbial growth was detected by the application of both plant residues in multicontaminated soil. The maximum TPH removal of 30% was achieved in amended soil with 20 g kg-1 SCB and 20 kg-1 LL. All the experimental conditions revealed changes in the microbial community structure, related to the handling of the soil, with abundance of Alphaproteobacteria. This study demonstrates the effectiveness of the plant residues SCB and LL as low-cost nutritional materials for biodegradation of hydrocarbon in real oil contaminated soil by indigenous populations.

中文翻译：

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使用植物材料对工业现场的土壤进行生物修复。

生物修复是用于处理受油污染的土壤的现有技术之一，可以通过引入低成本的营养材料加以改进。这项研究的目的是评估将两种低成本植物残渣（豆科含羞草含羞草（sabiá）的豆科植物甘蔗渣（SCB）和枯枝落叶（LL））分别或联合添加到一家炼油厂的污染土壤中治疗90天后进行分析。单独地，两种量的SCB（20和40 g kg-1）都有利于总异养细菌和总真菌的生长，而20 g kg-1的LL更好地刺激了土壤中碳氢化合物降解微生物的活性。但是，在任何这些条件下均未观察到TPH去除。通过在多污染土壤中施用两种植物残留物，可以检测到较高的微生物生长。在使用20 g kg-1 SCB和20 kg-1 LL的改良土壤中，最大TPH去除率为30％。所有的实验条件都表明，与土壤处理有关的微生物群落结构发生了变化，其中有大量的变形杆菌。这项研究证明了植物残渣SCB和LL作为低成本营养材料对于土著居民对真实石油污染土壤中的碳氢化合物进行生物降解的有效性。