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首页> 外文期刊>Water, Air, and Soil Pollution >PHYTOREMEDIATION AND MODELING OF CONTAMINATED SOIL USING EASTERN GAMAGRASS AND ANNUAL RYEGRASS
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PHYTOREMEDIATION AND MODELING OF CONTAMINATED SOIL USING EASTERN GAMAGRASS AND ANNUAL RYEGRASS

机译：利用东格拉斯和年黑麦进行植物污染土壤的植物修复和建模

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The effectiveness of a warm season grass (eastern gamagrass), a cool season grass (annual ryegrass) and a rotation of warm and cool season grasses in the remediation of soil freshly contaminated with trinitrotoluene (TNT) and polybrominated biphenyls (PBBs) was evaluated. A total of 96 columns were filled with a Weswood silt loam soil that was mixed with TNT and PBB compounds to a target concentration of 10 mg of each contaminant. Chemical losses during this two-year field lysimeter experiment were similar for all experimental treatments and at all depths. Although higher microbial biomass was found in the rhizosphere soil, enumeration of soil microorganisms revealed a robust population in both the bulk and rhizosphere soils and the microbial growth was not dependent on root exudates only. Microbial degradation rates in the freshly contaminated soil were more affected by soil properties and the chemical characteristics of the contaminant than the presence of roots. The field data collected from the lysimeter experiment was used to calibrate a recently developed phytoremediation model. The phytoremediation computer model successfully simulated TNT soil concentrations in the column lysimeters. The model may be a valuable tool for the selection and optimization of phytoremediation methods at contaminated field sites.
机译：评估了暖季草（东部蒲），凉季草（一年生黑麦草）以及暖季和凉季草轮换在新鲜污染了三硝基甲苯（TNT）和多溴联苯（PBBs）的土壤中的有效性。总共96根色谱柱填充有Weswood淤泥质壤土，将其与TNT和PBB化合物混合，使每种污染物的目标浓度为10 mg。在两年的现场溶渗仪实验期间，所有实验处理和所有深度的化学损失均相似。尽管在根际土壤中发现了较高的微生物生物量，但对土壤微生物的枚举显示在块状土壤和根际土壤中都有强大的种群，微生物的生长不仅取决于根系分泌物。与根部相比，新鲜污染土壤中的微生物降解率受土壤性质和污染物化学特性的影响更大。从溶渗仪实验收集的现场数据用于校准最近开发的植物修复模型。该植物修复计算机模型成功地模拟了柱渗析仪中的TNT土壤浓度。该模型可能是用于选择和优化污染场地现场植物修复方法的有价值的工具。

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