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首页> 外文期刊>International Journal of Environmental Science and Technology >Comparison of different iron oxide adsorbents for combined arsenic, vanadium and fluoride removal from drinking water
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Comparison of different iron oxide adsorbents for combined arsenic, vanadium and fluoride removal from drinking water

机译：饮用水中砷，钒和氟化氟胺不同氧化铁吸附剂的比较

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摘要

Contamination of groundwater by arsenic due to natural processes is rather common worldwide and hinders its use for drinking water supply. In many cases, arsenic contamination is found together with high levels of vanadium and fluoride. Therefore, more than one type of treatment is required to reduce concentrations of all these contaminants below non-hazardous levels so to make the source drinkable. The present study investigated the uptake capacity of arsenic, vanadium and fluoride by three iron-based adsorbent media differing for particle size, iron content and specific surface. The aim of the treatment was to achieve the maximum allowable concentration set on drinking water by the law. The removal efficiency was evaluated in single and binary contaminated solutions. All the tested adsorbents demonstrated an efficient and rapid removal process of both arsenic and vanadium in the single and binary solutions, with a higher adsorption capacity for vanadium; by contrast, they were unable to achieve an appreciable reduction in fluoride concentration. The particle size showed to have the highest effect on the removal rate. The best kinetic and isotherm models and the related parameters were determined for each condition. In the binary solutions, the presence of vanadium hindered the uptake of arsenic, whereas fluoride did not have any effect. The results obtained showed that the iron-based adsorbents tested in the present study can be successfully applied for the treatment of drinking water contaminated by arsenic and vanadium, whereas a different medium or process needs to be adopted for the removal of fluoride.
机译：由于天然工艺，砷因天然气的污染是全球相当普遍的，并且阻碍了其用于饮用水供应的用途。在许多情况下，砷污染与高水平的钒和氟化物一起发现。因此，需要一种以上的治疗方法来将所有这些污染物的浓度降低到非危险水平以下，因此使源饮用。本研究研究了三种铁基吸附剂介质对粒度，铁含量和比表面不同的三种铁基吸附剂介质的摄取能力。治疗的目的是通过法律达到饮用水上的最大允许浓度。在单一和二元污染的解决方案中评估了去除效率。所有测试的吸附剂都证明了单一和二元溶液中砷和钒的有效和快速的去除过程，具有较高的钒吸附能力;相比之下，它们无法达到氟化物浓度的明显降低。粒度显示出对去除率的最高效果。确定每个条件的最佳动力学和等温模型和相关参数。在二元溶液中，钒的存在阻碍了砷的摄取，而氟化物没有任何效果。得到的结果表明，在本研究中测试的铁基吸附剂可以成功地应用于由砷和钒污染的饮用水处理，而需要采用不同的培养基或方法来除去氟化物。

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