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Microbial community and ecotoxicity analysis of bioremediated, weathered hydrocarbon-contaminated soil

机译：生物修复的，风化的碳氢化合物污染土壤的微生物群落和生态毒性分析

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摘要

Bioremediated soils are usually disposed of after meeting legislated guidelines defined by chemical and ecotoxicity tests. In many countries including Australia, ecotoxicity tests are not yet mandatory safety requirements. This study investigated the biotreatment of weathered hydrocarbon-contaminated soils in 12-week laboratory-based microcosms. Monitored natural attenuation resulted in similar to 43% reduction of total petroleum hydrocarbon contaminant to 5503 mg/kg (C-16-C-35), making the soil suitable for disposal as waste under current guidelines (pesticide and metal contents within safe limits). 16S rDNA (universal and AlkB) and ITS-based DGGE fingerprints showed stable and adapted microbial communities throughout the experimental period. However, ecotoxicology assays showed 100% mortality of earthworms (Eisena fetida) in potting soils containing >= 50% (>= 2751 mg/kg, legally safe in situ concentrations) contaminated soil over 14 days. Up to 70% reduction in radish (Raphanus sativus) seed germination was observed in potting soils containing >= 10% contaminated soil (>= 550 mg/kg, legally safe ex situ concentrations for soil disposal into residential areas). The results indicate the toxicity of these soils to soil biota despite meeting legislated Australian safe levels and guidelines for disposal or use in residential areas.
机译：生物修复的土壤通常在满足化学和生态毒性测试定义的法律准则后进行处理。在包括澳大利亚在内的许多国家，生态毒性测试还不是强制性的安全要求。这项研究在12周的实验室微观世界中研究了风化的碳氢化合物污染土壤的生物处理。监测到的自然衰减导致石油烃污染物总量减少了约43％，降至5503 mg / kg（C-16-C-35），使土壤适合根据现行准则作为废物处置（农药和金属含量在安全范围内） 。在整个实验期间，16S rDNA（通用和AlkB）和基于ITS的DGGE指纹显示稳定且适应的微生物群落。然而，生态毒理学分析表明，在含有≥50％（≥2751 mg / kg，法律上安全的原位浓度）污染土壤的盆栽土壤中，over在14天内的死亡率为100％。在含有> = 10％污染土壤（> = 550 mg / kg，法律上安全的易地异位浓度，用于土壤处理到居民区）的盆栽土壤中，萝卜种子发芽减少了70％。结果表明，尽管符合澳大利亚法律规定的安全水平和在居民区处置或使用的准则，但这些土壤对土壤生物区系的毒性。

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