Arsenic removal from groundwater by a newly developed adsorbent.
Arsenic removal from groundwater by a newly developed adsorbent.
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DOI：
10.2166/wst.2004.0479
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发表时间：
2004-10
期刊：
影响因子：
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通讯作者：
H. Takanashi;A. Tanaka;T. Nakajima;A. Ohki
中科院分区：
文献类型：
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作者：
H. Takanashi;A. Tanaka;T. Nakajima;A. Ohki
采用一种新型的磷酸盐吸附剂对地下水中的砷进行吸附。采用间歇法研究了吸附等温线、吸附等温线的pH依赖性和吸附速率。此外，通过使用市售的直径为1.8mm的颗粒吸附剂，进行了实验室规模的连续吸附处理含砷50 mg m（-3）的实际地下水的实验室规模的实验，以检查吸附剂的性能。大量的砷，即，10 g As kg（-1），在pH 7.0时吸附，平衡浓度为10 mg As m（-3）。与传统的活性氧化铝相比，其含量仅高出5%。然而，床体积的两倍，即，流出物的总体积除以空柱体积，直到通过使用这种新型吸附剂穿透。这可能是因为增大吸附剂的表观吸附容量的pH降低是由吸附剂的自身pH降低功能引起的。自pH降低功能必须通过Al（III）水离子的解离来提供。在分批实验中清楚地观察到质子释放。
A novel adsorbent, which had been developed for phosphate adsorption, was adopted for arsenic removal from groundwater. Adsorption isotherm, pH dependence of the isotherm and adsorption rate were studied by batch method. Furthermore, by using a granular adsorbent of 1.8 mm diameter which is commercially available, lab-scale experiments of continuous adsorption treatment of actual groundwater containing arsenic at 50 mg m(-3) were conducted to examine the performance of the adsorbent. A large amount of arsenic, i.e., 10 g As kg(-1), was adsorbed at pH 7.0 and 10 mg As m(-3) in equilibrium concentration. It was only a 5% higher amount compared to conventional activated alumina. However, twice the bed volume, i.e., total volume of effluent divided by empty column volume, was achieved till breakthrough by using this novel adsorbent. This may be because the pH decrease, which enlarges apparent adsorption capacity of the adsorbent, is caused by a self-pH decrease function of the adsorbent. The self-pH decrease function must be delivered by dissociation of Al (III) aquoion. The proton release was clearly observed in batch experiments.