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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Radionuclides in plants growing on sludge and water from uranium mine water treatment
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Radionuclides in plants growing on sludge and water from uranium mine water treatment

机译：铀矿井水处理产生的淤泥和水中生长的植物中的放射性核素

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摘要

Chemical treatment of uranium mine acid drainage generates sludge containing high radioactivity levels with, for example, ~(238)U and ~(226)Ra concentrations at about 18 and 9kBq kg~(-1) dry weight, respectively. Spontaneous vegetation, such as grass (Polygonum sp.), reeds (Phragmites australis), and bullrush (Typha latifolia) growing in sludge dewatering ponds concentrated uranium and uranium daughter radionuclides. However, bullrush growing in natural wetlands by the stream receiving treated mine water discharges contained even higher radionuclide concentrations, e.g., 21 Bq kg~(-1) dry weight of ~(238)U, about four times higher than bullrush growing on sludge, probably because the uranium in water is more bioavailable to Typha than uranium in the chemical sludge. It is suggested that wetlands with plant species could be used as a secondary treatment to further reduce radioactivity in chemically treated uranium mine water and to improve water quality in streams receiving treated water discharges. Furthermore, it is concluded that vegetation both from sludge drying ponds and from streams receiving treated water discharges, due to the high radionuclide concentrations in the vegetation, is not suitable as cattle feeding.
机译：铀矿排酸的化学处理产生的污泥含有高放射性水平，例如干重约为18kBq kg〜（-1）时，〜（238）U和〜（226）Ra浓度较高。在污泥脱水池中生长的自发植被，例如草（Polygonum sp。），芦苇（Phragmites australis）和bull草（Typha latifolia），都浓缩了铀和铀子放射性核素。但是，在自然湿地中，经过处理后的矿井水排放的溪流中生长的稻草含有更高的放射性核素浓度，例如21 Bq kg〜（-1）的干重约为（238）U，比淤泥上生长的稻草高约四倍，可能是因为水中的铀比化学污泥中的铀更易被Typha吸收。建议将具有植物物种的湿地用作二级处理，以进一步降低化学处理过的铀矿井水中的放射性并改善接受处理过的水排放的溪流中的水质。此外，得出的结论是，由于污泥干燥池中和接受处理后的水流的溪流中的植被，由于植被中放射性核素的浓度很高，因此不适合作为牛饲养。

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