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首页> 外文期刊>Canadian Journal of Soil Science >Detection and degradation of organic contaminants in an agricultural soil amended with alkaline-treated biosolids
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Detection and degradation of organic contaminants in an agricultural soil amended with alkaline-treated biosolids

机译：用碱处理的生物固体修正的农业土壤中有机污染物的检测和降解

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The agricultural use of wastewater biosolids is a common practice in many countries, but concerns exist regarding the presence of organic wastewater contaminants that remain in the land-applied biosolids. The objective of this study was to determine if contaminants present in biosolids are detectable in soil following land application. A suite of organic contaminants were monitored by gas chromatograph with mass spectrometer in agricultural soil samples from a site amended with increasing rates of alkaline-treated biosolids. Triclosan, a common antimicrobial agent, was detected at levels greater than the reporting limit in an environment-controlled incubation study and validated through in situ field samples from soils receiving the same alkaline-treated biosolid. A rapid decrease in triclosan concentration was observed during the first few weeks of the incubation study, with concentrations decreasing from 92 +/- 26 to 20 +/- 2 ng g(-1) (average 78% decrease) after 4 mo. The field results indicate that triclosan in fall-applied may persist overwinter. However, a rapid decrease in triclosan concentration during the spring and summer months led to levels lower than predicted following the spring application, and levels below our reporting limit (up to 85% decrease) by the end of the study. Removal is posited to be through aerobic microbial degradation.
机译：在农业上，废水生物固体的使用是许多国家的普遍做法，但是人们担心存在于土地施用的生物固体中的有机废水污染物的存在。这项研究的目的是确定土地施用后土壤中是否可检测到生物固体中存在的污染物。通过气相色谱仪和质谱仪对来自土壤处理地点的农业土壤样品中的一组有机污染物进行了监测，该地点的碱处理生物固体的比例不断提高。在环境控制的孵育研究中，三氯生（一种常见的抗菌剂）的含量高于报告限值，并通过从接受相同碱处理过的生物固体的土壤中就地采集的样品进行了验证。在孵育研究的前几周内，三氯生的浓度迅速下降，在4个月后，浓度从92 +/- 26降至20 +/- 2 ng g（-1）（平均降低78％）。田间结果表明，三氯生在秋季应用可能会持续越冬。但是，在春季和夏季，三氯生浓度的快速下降导致该水平低于春季施用后的预期水平，并且到研究结束时水平低于我们的报告限值（下降了85％）。去除被认为是通过有氧微生物降解。

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