Nutrients adsorption from seawater by new porous carrier made from zeolitized fly ash and slag.
Nutrients adsorption from seawater by new porous carrier made from zeolitized fly ash and slag.
复制标题
由沸石粉煤灰和矿渣制成的新型多孔载体从海水中吸附营养物质。
DOI：
10.1016/s0025-326x(02)00107-8
复制
发表时间：
2002
影响因子：
5.8
通讯作者：
M. Nishioka
中科院分区：
文献类型：
--
作者：
O. Khelifi;Y. Kozuki;H. Murakami;Kengo Kurata;M. Nishioka
研究了高炉渣对磷酸盐的吸附和沉淀作用.为了评价BFS的吸附能力，在使用之前用酸处理BFS。研究了一种能同时吸附富营养化海水中氨氮和磷酸盐的新型多孔载体。采用水热热压法（HHP）将工业固体废弃物（如高炉矿渣和粉煤灰合成沸石）固化成圆柱形多孔载体，从而提高其资源化利用率。尝试使用排列的HHP方法生产具有不同孔隙率（24%、40%和52%（v/v））的多孔载体。载体的物理性能，如孔隙率，抗压强度和高度进行了研究。实验室研究表明，多孔载体对磷酸盐和铵具有很强的选择性。结果表明，孔隙率在提高磷酸盐和铵吸附的作用，增加单位重量的表面积。根据Freundlich方程估计的参数和相关系数表明，吸附与载体的孔隙率有关，孔隙率大的载体对磷和铵有较好的吸附。研究结果表明，开发高孔隙率的载体是一种很有前途的强化营养盐吸附的方法。
This study investigated the adsorption and precipitation of phosphate by blast furnace slag (BFS) separately. In order to evaluate the adsorption capacity of BFS, BFS was treated before its use by acid. The authors aim to develop a new porous carrier to adsorb simultaneously ammonium and phosphate from seawater under eutrophic conditions. The current paper deals with a promising new approach to improve the utilization of some industrial solid wastes such as BFS and zeolite synthesized from fly ash [ZFA(Fe)] by their solidification to cylindrical porous carriers using a hydrothermal hot-pressing (HHP) method. Attempts to produce porous carriers using an arranged HHP method with different porosities (24%, 40% and 52% (v/v)) were carried out. Physical properties of carriers such as porosity, compressive strength and height have been investigated. Laboratory studies showed strong evidence that the porous carrier was very selective towards phosphate and ammonium. The results demonstrated the role of porosity in enhancing phosphate and ammonium adsorption by the increase of the surface area per weight. The estimates of the parameters and the correlation coefficients according to the Freundlich equations revealed that adsorption was related to the porosity of carriers and phosphate and ammonium were adsorbed well on the carriers having large porosity. The results suggested that developing carrier with high porosity was a promising way to enhance nutrients adsorption.