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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Evaluation of Extraction Procedures for Removing Lead from Contaminated Soil
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Evaluation of Extraction Procedures for Removing Lead from Contaminated Soil

机译：评价从污染土壤中去除铅的提取程序

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Soil extraction of lead contaminated soil collected from sites near an abandoned battery recycling and secondary lead-smelting factory was investigated for potential use in decontaminating soil at the sites. A fractionation study was conducted to elucidate soil retention mechanism for Pb at the site. Three soil pits were selected from an area surrounding the factory based on level of Pb contamination. Soil samples were collected from each pit in two layers: surface soil and subsoil (0-15 cm and 15-30 cm). Soil physical analysis showed that the soil texture was sandy loam and sandy clay loam with clay content between 11-21%. Soil pH was strongly acid to moderately acid (pH 4.8-5.9). Pb levels in the surface soil were 1620 and 153 mg kg~(-1) (air-dried basis) respectively for heavily and slightly contaminated soil. A reference soil site contained 15 mg kg~(-1) of Pb. Partitioning studies indicated that more than 90% of total Pb in the soil existed in three primary fractions: exchangeable, carbonate, and Fe-Mn oxide. This suggested that Pb sources entering the soil from the Pb factory remained in relatively weakly bound forms, which are mobile and have potentially biological availability. Mobility of Pb as in the soil assessed by mobility factor (MF) was as high as 75% indicating a high potential of Pb remobilization. Due to high mobility, the Pb would be amendable to remediation or removal by soil extraction procedures. To determine if such weekly bound Pb could be easily removed, both soil washing (ex situ) and soil flushing (in situ) techniques were evaluated for potential Pb remediation procedure. Particle size separation of soil into coarse (2.0-0.25 mm), medium (0.25-0.15 mm), and fine size (< 0.15 mm) was conducted before initiating soil washing for comparing Pb removal efficiency in these fractions with the indigenous soil fraction. Using EDTA (2:1 mole to Pb) as a washing solution up to 85-95% of Pb was removed under the optimum conditions (retention time = 60 min), and liquid to solid ratio (L/S) at 5:1 for coarse fraction and 10:1 for smaller fraction.
机译：调查了从废弃电池回收和二次铅冶炼厂附近场所收集的铅污染土壤的土壤提取物，以潜在用于污染场所的污染。进行了分级研究以阐明该地点铅的土壤保留机制。根据铅的污染水平从工厂周围的区域中选择了三个土坑。从每个坑中分两层收集土壤样品：表层土壤和下层土壤（0-15厘米和15-30厘米）。土壤物理分析表明，土壤质地为砂壤土和砂质壤土，粘土含量在11-21％之间。土壤pH为强酸至中酸（pH 4.8-5.9）。重度和轻度污染土壤的表层土壤铅水平分别为1620和153 mg kg〜（-1）（风干）。参考土壤位点含有15 mg kg〜（-1）的Pb。分区研究表明，土壤中90％以上的总Pb以三个主要部分存在：可交换的，碳酸盐的和Fe-Mn氧化物。这表明从铅工厂进入土壤的铅源仍以相对较弱的结合形式存在，它们是可移动的并且具有潜在的生物利用度。通过迁移率因子（MF）评估，土壤中Pb的迁移率高达75％，表明Pb迁移的潜力很大。由于迁移率高，铅可通过土壤提取程序进行修复或去除。为了确定这种每周结合的Pb是否易于清除，对土壤冲洗（异地）和土壤冲洗（原地）技术均进行了潜在的Pb修复程序评估。在开始土壤洗涤之前，先将土壤分为粗颗粒（2.0-0.25毫米），中等颗粒（0.25-0.15毫米）和细颗粒（<0.15毫米），然后将这些部分的Pb去除效率与本地土壤部分的Pb去除效率进行比较。使用EDTA（相对于Pb为2：1摩尔）​​作为清洗溶液，在最佳条件下（保留时间= 60分钟）去除了高达85-95％的Pb，液固比（L / S）为5：1对于较粗的分数，对于较小的分数为10：1。

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