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Removal naturally occurring radionuclides from drinking water using a filter specifically designed for Drinking Water Treatment Plants

机译：使用专门为饮用水处理厂设计的过滤器去除饮用水中的天然放射性核素

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摘要

The occurrence of naturally occurring radionuclides in drinking water can pose health hazards in some populations, especially taking into account that routine procedures in Drinking Water Treatment Plants (DWTPs) are normally unable to remove them efficiently from drinking water. In fact, these procedures are practically transparent to them, and in particular to radium. In this paper, the characterization and capabilities of a patented filter designed to remove radium from drinking water with high efficiency is described. This filter is based on a sandwich structure of silica and green sand, with a natural high content manganese oxide. Both sands are authorized by Spanish authorities to be used in Drinking Water Treatment Plants. The Mn distribution in the green sand was found to be homogenous, thus providing a great number of adsorption sites for radium. Kinetic studies showed that the Ra adsorption on green sand was influenced by the content of major cations solved in the treated water, but the saturation level, about 96–99%, was not affected by it. The physico-chemical parameters of the treated water were unaltered by the filter. The efficiency of the filter for the removal of Ra remained unchanged with large water volumes passed through it, proving its potential use in DWTP. This filter was also able to remove initially the uranium content due to the presence of FeO particles in it, although it is saturated faster than radium.
机译：饮用水中天然存在的放射性核素的存在可能对某些人群造成健康危害，尤其是考虑到饮用水处理厂（DWTP）的常规程序通常无法有效地将其从饮用水中去除。实际上，这些程序对它们，特别是镭实际上是透明的。在本文中，描述了旨在高效去除饮用水中镭的专利过滤器的特性和功能。该过滤器基于二氧化硅和绿砂的夹心结构，具有天然高含量的锰氧化物。两种沙子均获得西班牙当局的授权，可用于饮用水处理厂。发现绿砂中的Mn分布是均匀的，因此为镭提供了大量的吸附位点。动力学研究表明，在处理过的水中溶解的主要阳离子含量会影响Ra在绿沙上的吸附，但是饱和水平（约96–99％）不受此影响。过滤器不会改变处理过的水的理化参数。随着大量水的通过，过滤器去除Ra的效率保持不变，证明了其在DWTP中的潜在用途。由于FeO颗粒的浸透速度快于镭，因此该滤池最初也能够去除铀中的FeO颗粒。

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