Phosphate removal and recovery with a synthetic hydrotalcite as an adsorbent
Phosphate removal and recovery with a synthetic hydrotalcite as an adsorbent
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DOI：
10.1016/j.chemosphere.2005.04.015
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发表时间：
2006-01-01
期刊：
影响因子：
8.8
通讯作者：
Lee, TG
中科院分区：
文献类型：
--
作者：
Kuzawa, K;Jung, YJ;Lee, TG
磷酸盐去除对于控制富营养化是重要的，并且离子交换过程是用于此目的的几种处理过程之一。水滑石化合物（HTALs）由于其离子交换性质而可用作磷酸盐去除的吸附剂。在这项研究中，颗粒合成HTAL对磷酸盐的吸附性能和再生的颗粒HTAL的方法进行了研究。颗粒状HTAL的吸附等温线近似于修正的Langmuir型，最大吸附量为47.3mgPg（-1），与颗粒状HTAL的含量相当。吸附在HTAL上的磷酸盐被有效地解吸与碱性NaCl溶液和HTAL再生与25 w/v%的MgCl 2溶液。再生后的HTAL可重复用于除磷。通过添加CaCl 2，以磷酸钙沉淀的形式回收解吸废液中的磷酸盐，剩余的解吸废液也可在补充NaOH后重复使用。结果表明，一个有效的系统的磷酸盐去除和回收，其中包括以下过程的可能性：吸附，解吸，磷酸盐的回收，HTAL和解吸液的再生。(c)2005爱思唯尔有限公司保留所有权利。
Phosphate removal is important to control eutrophication and an ion exchange process is one of several treatment processes for this purpose. Hydrotalcite compounds (HTALs) are useful as adsorbents for phosphate removal because of their ion exchange properties. In this study, the adsorption properties of a granular synthetic HTAL for phosphate and the method of regeneration of the granular HTAL were examined. The adsorption isotherm of the granular HTAL was approximated by a modified Langmuir type, and the maximum adsorption capacity was 47.3 mg P g(-1), which corresponded to the content of HTAL in the granular one. Phosphate adsorbed on the HTAL was effectively desorbed with alkaline NaCl solutions and the HTAL was regenerated with 25 w/v% MgCl2 solution. The regenerated HTAL could be reused repeatedly for the phosphate removal. Phosphate in the exhausted desorption solution was recovered as a precipitate of calcium phosphate by addition of CaCl2, and the residual exhausted desorption solution could be also reused after supplying NaOH. The results suggest the possibility of an effective system for phosphate removal and recovery, which includes the following processes: adsorption, desorption, recovery of phosphate, and regeneration of the HTAL and the desorption solution. (c) 2005 Elsevier Ltd. All rights reserved.