Removal of ammonia nitrogen from distilled old landfill leachate by adsorption on raw and modified aluminosilicate
Removal of ammonia nitrogen from distilled old landfill leachate by adsorption on raw and modified aluminosilicate
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DOI：
10.1080/09593330.2016.1212935
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发表时间：
2017-04
影响因子：
2.8
通讯作者：
Rafael S P Couto;Aline Faria Oliveira;Alcides Wagner Serpa Guarino;D. V. Pérez;M. Marques
中科院分区：
文献类型：
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作者：
Rafael S P Couto;Aline Faria Oliveira;Alcides Wagner Serpa Guarino;D. V. Pérez;M. Marques
本研究旨在评价铝硅酸盐对氨氮的去除效果，采用两种标准溶液作为预处理垃圾渗滤液。采用标准溶液对三种商品粘土和一种商品沸石进行了初步测试；然而，只有一种粘土和沸石具有最佳的去除性，并与预处理渗滤液进行了测试。所选粘土对标准溶液的吸附量为83%，对预处理渗滤液的吸附量为95%，沸石的去除率为73%，沸石的去除率为81%。对这两种吸附剂的吸附平衡和动力学进行了研究。Langmuir模型能较好地描述离子交换平衡，吸附机理符合准二级动力学模型。此外，对渗滤液进行预处理不仅对溶液中铵的检测至关重要，而且对其在硅酸铝中的吸附也很重要。这种氨氮去除的替代方法还可以产生一种处理后的产品，可以用作肥料形式的农业原料。
ABSTRACT This study aimed to evaluate the ammonia–nitrogen removal by aluminosilicates, using both standard solutions as pretreated landfill leachate. Three types of commercial clays and one commercial zeolite were initially tested using standard solution; however, only one clay with the best removability and the zeolite were tested with pretreated leachate. The chosen clay sorption capacity with the standard solution reached 83%, while with the pretreated leachate solution has reached 95% and zeolites have reached, respectively, a removal of 73% and 81%. For this two adsorbents’ studies of equilibrium and kinetic of the sorption were also performed. The Langmuir model was more adequate to describe the ion exchange equilibrium and the sorption mechanism fit the pseudo-second-order kinetic model. Moreover, the pretreatment used on leachate proved to be essential not only for ammonium detection in solution, but also to facilitate its sorption in aluminosilicates. This alternative of ammonia–nitrogen removal also generates a product derived from treatment that can be used as agricultural feedstock in the form of fertilizer.