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首页> 外文期刊>Journal of Environmental Radioactivity >Land application of mine water causes minimal uranium loss offsite in the wet-dry tropics: Ranger Uranium Mine, Northern Territory, Australia
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Land application of mine water causes minimal uranium loss offsite in the wet-dry tropics: Ranger Uranium Mine, Northern Territory, Australia

机译：矿山水的土地施用在湿干热带地区使铀矿的异地损失最小：澳大利亚北领地游骑兵铀矿

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Ranger Uranium Mine (RUM) is situated in the wet-dry tropics of Northern Australia. Land application (irrigation) of stockpile (ore and waste) runoff water to natural woodland on the mine lease is a key part of water management at the mine. Consequently, the soil in these Land Application Areas (LAAs) presents a range of uranium (U) and other metals concentrations. Knowledge of seasonal and temporal changes in soil U and physicochemical parameters at RUM LAAs is important to develop suitable management and rehabilitation strategies. Therefore, soil samples were collected from low, medium, high and very high U sites at RUM LAAs for two consecutive years and the effect of time and season on soil physicochemical parameters particularly U and other major solutes applied in irrigation water was measured. Concentrations of some of the solutes applied in the irrigation water such as sulphur (S), iron (Fe) and calcium (Ca) showed significant seasonal and temporal changes. Soil S, Fe and Ca concentration decreased from year 1 to year 2 and from dry to wet seasons during both years. Soil U followed the same pattern except that we recorded an increase in soil U concentrations at most of the RUM LAAs after year 2 wet season compared to year 2 dry season. Thus, these sites did not show a considerable decrease in soil U concentration from year 1 to year 2. Sites which contained elevated U after wet season 2 also had higher moisture content which suggests that pooling of U containing rainwater at these sites may be responsible for elevated U. Thus, U may be redistributed within RUM LAAs due to surface water movement. The study also suggested that a decrease in U concentrations in LAA soils at very high U (>900 mg kg(-1)) sites is most likely due to transport of particulate matter bound U by surface runoff and U may not be lost from the surface soil due to vertical movement through the soil profile. Uranium attached to particulate matter may reduce its potential for environmental impact. These findings suggest that U is effectively adsorbed by the soils and thus land application may serve as a useful tool for U management in the wet-dry tropics of northern Australia. (C) 2015 Elsevier Ltd. All rights reserved.
机译：游侠铀矿（RUM）位于北澳大利亚的干湿热带地区。将矿山租约中的天然林地中的库存（矿石和废物）径流水进行土地应用（灌溉）是矿井水管理的关键部分。因此，这些土地应用区域（LAA）中的土壤呈现出一定范围的铀（U）和其他金属浓度。了解RUM LAAs的土壤U和理化参数的季节性和时间变化对于制定合适的管理和恢复策略很重要。因此，连续两年从RUM LAA的低，中，高和非常高的U地点采集土壤样品，并测量了时间和季节对土壤理化参数的影响，特别是灌溉水中施用的U和其他主要溶质。灌溉水中施用的某些溶质（例如硫（S），铁（Fe）和钙（Ca））的浓度表现出明显的季节和时间变化。从第1年到第2年，以及从旱季到湿季，土壤S，Fe和Ca的浓度均在这两年内下降。土壤U遵循相同的模式，不同之处在于我们记录了在第2年湿季之后与第2年干季相比，大多数RUM LAA的土壤U浓度增加。因此，从第1年到第2年，这些地点的土壤U浓度并未显着下降。在第2季雨季之后含U量较高的地点的水分含量也较高，这表明在这些地点汇集的含雨水可能是造成这种情况的原因。因此，由于地表水的运动，U可能在RUM LAA中重新分配。该研究还表明，在非常高的U（> 900 mg kg（-1））位置，LAA土壤中U浓度的降低很可能是由于表面径流限制了与U结合的颗粒物的运输，U可能不会从U损失。由于垂直运动穿过土壤剖面而在地表土壤中造成的。附着在颗粒物上的铀可能会降低其对环境的影响。这些发现表明，U被土壤有效地吸收，因此在澳大利亚北部的干湿热带地区，土地施用可作为管理U的有用工具。 （C）2015 Elsevier Ltd.保留所有权利。

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