Kinetic Adsorption of Ammonium Nitrogen by Substrate Materials for Constructed Wetlands

作     者：ZHU Wen-Ling CUI Li-Hua OUYANG Ying LONG Cui-Fen TANG Xiao-Dan 

作者机构：College of Natural Resources and Environmental Science South China Agricultural University Guangzhou 510642 (China) Urban Drainage Monitoring Station of Guangzhou City Guangzhou 510010 (China) Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions South China Agricultural University Guangzhou 510642 (China) Department of Water Resources St. Johns River Water Management District Palatka Florida 32178 (USA) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2011年第21卷第4期

页      面：454-463页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：Supported by the National Natural Science Foundation of China (Nos. 40871110 and 30828005) the National Water Pollution Control and Management Special Project of China (No. 2009ZX07102-003) the Special Project of Science and Technology of Guangdong Province,China (No. 2008A080800028) the Supporting Project of Science and Technology of Guangzhou City,China (No. 2008Z1-E621) 

主　　题：ammonia removal kinetic adsorption capacity Langmuir isotherm physicochemical properties substrate materials 

摘      要：Constructed wetlands （CWs） are engineered systems that utilize natural systems including wetland vegetations, soils, and their associated microbial assemblages to assist in treating wastewater. The kinetic adsorption of ammonium nitrogen （NH＋-N） by CW substrate materials such as blast furnace slag （BFS）, zeolite, ceramsite, vermiculite, gravel, paddy soil, red soil, and turf, was investigated using batch experiments and kinetic adsorption isotherms. Both Freundlich and Lang- muir isotherms could adequately predict the NH＋-N adsorption process. The maximum adsorption capacities of NH＋-N, estimated from the Langmuir isotherm, ranked as： zeolite （33 333.33 mg kg^-1） 〉 turf （29274.01 mg kg^-1） 〉 BFS （5000 mg kg^-1） 〉 vermiculite （3333.33 mg kg^-1） 〉 gravel （769.23 mg kg^-1） 〉 paddy soil （588.24 mg kg^-1） 〉 red soil （555.56 mg kg^-1） 〉 ceramsite （107.53 mg kg^-1）. Some properties of the substrate materials, including bulk density, specific gravity, hydraulic conductivity, uniformity coefficient （K60）, curvature coefficient （Co）, organic matter, pH, exchangeable （or active） Cu, Fe, Zn and Mn, total Cu, and Fe, Mn, Zn, Cd, Pb and Ca, had negative correlations with NH＋-N adsorption. Other properties of the substrate materials like particle diameter values of D10, 030 and 060 （the diameters of particle sizes of a substrate material at which 10%, 30% and 60%, respectively, of the particles pass through the sieve based on the accumulative frequency）, cation exchange capacity （CEC）, exchangeable （or active） Ca and Mg, and total K and Mg had positive correlations with NH＋-N adsorption. In addition, active K and Na as well as the total Na had significant positive correlations with NH＋-N adsorption. This information would be useful for selection of suitable substrate materials for CWs.