Bioremediation of a weathered and a recently oil-contaminated soils from Brazil: a comparison study.
Bioremediation of a weathered and a recently oil-contaminated soils from Brazil: a comparison study.
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DOI：
10.1016/j.chemosphere.2004.09.021
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发表时间：
2005
期刊：
影响因子：
8.8
通讯作者：
P. Trindade;L. Sobral;A. Rizzo;S. Leite;A. U. Soriano
中科院分区：
文献类型：
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作者：
P. Trindade;L. Sobral;A. Rizzo;S. Leite;A. U. Soriano
从土壤中去除碳氢化合物的设施与土壤样品由于风化而造成的老化程度成反比。风化是指生物、化学和物理过程的结果，这些过程可能会影响土壤中残留的碳氢化合物的类型。这些过程增强了疏水性有机污染物(HOCs)对土壤基质的吸附，降低了生物降解的速度和程度。此外，与风化土壤相比，高浓度的污染物化合物更容易影响新近受到污染的土壤中的微生物种群，从而抑制生物降解过程。本研究旨在比较巴西石油污染土壤和风化土壤在应用生物强化和生物刺激技术后的生物降解效率。两种土壤的石油烃总量均为5.4%，其中风化污染土壤的生物降解率最高(7.4%)。可以得出的结论是，在所有测试条件下，生物降解率都很低，这反映了受高原油浓度污染的风化土壤的处理难度。此外，接受生物强化和生物刺激技术的两种土壤(风化和最近受到污染)的生物降解效率比没有进行上述处理(自然衰减)的土壤高出近一倍。
The facility with which hydrocarbons can be removed from soils varies inversely with aging of soil samples as a result of weathering. Weathering refers to the result of biological, chemical and physical processes that can affect the type of hydrocarbons that remain in a soil. These processes enhance the sorption of hydrophobic organic contaminants (HOCs) to the soil matrix, decreasing the rate and extent of biodegradation. Additionally, pollutant compounds in high concentrations can more easily affect the microbial population of a recently contaminated soil than in a weathered one, leading to inhibition of the biodegradation process. The present work aimed at comparing the biodegradation efficiencies obtained in a recently oil-contaminated soil (spiked one) from Brazil and an weathered one, contaminated for four years, after the application of bioaugmentation and biostimulation techniques. Both soils were contaminated with 5.4% of total petroleum hydrocarbons (TPHs) and the highest biodegradation efficiency (7.4%) was reached for the weathered contaminated soil. It could be concluded that the low biodegradation efficiencies reached for all conditions tested reflect the treatment difficulty of a weathered soil contaminated with a high crude oil concentration. Moreover, both soils (weathered and recently contaminated) submitted to bioaugmentation and biostimulation techniques presented biodegradation efficiencies approximately twice as higher as the ones without the aforementioned treatment (natural attenuation).