地下水-胶体-固体颗粒体系氨氮吸附分配特征  

Adsorption distribution characteristics of ammonia-nitrogen in the groundwater-colloid-solid particle system

作　　者：李海明[1] 李云[2] 张楠[1] 吴锦兰[1] 

机构地区：[1]天津科技大学海洋科学与工程学院,天津300457 [2]天津市海洋资源与化学重点实验室,天津300457

出　　处：《人民长江》2010年第6期67-70,共4页Yangtze River

基　　金：国家自然科学基金项目(40602029;40872156);国家水体污染控制与治理科技重大专项(2009ZX07212-003)

摘　　要：为了研究胶体和固体颗粒同时存在时高浓度氨氮的吸附分配特征,根据天津市含水介质的结构和组成,选择3种代表性的含水介质,系统测定了不同含水介质中胶体和固体颗粒对氨氮吸附的动力学曲线和吸附等温线。研究结果表明:当胶体和固体颗粒同时存在时,不同含水介质胶体对氨氮吸附的动力学曲线均符合对数递减函数,而固体颗粒对氨氮的吸附量随时间增加,变化幅度很小;胶体对氨氮的吸附量远大于固体颗粒。胶体和固体颗粒对高浓度氨氮的吸附等温式分别为Freundlich方程和线性方程。粉砂胶体和固体颗粒对氨氮的吸附能力大于中砂和粉土。Combined with field survey information, beach experiments with three representative water - bearing media in the Tianjin coastal plain have been conducted to elucidate the adsorption distribution of ammonia - nitrogen between colloid and solid particles. In addition, dynamic curves and isotherms of ammonia - nitrogen adsorption on the colloid and solid particles in different water - bearing media have been determined. The research results show that adsorption kinetics of ammonia - nitrogen on colloids in different water - bearing media logarithmically decline when colloids and solid particles coexist ; adsorption of ammonium nitrogen on solid particles increases a little with increasing of the time, and the adsorption of ammonia - nitrogen on colloids is much larger than on that of solid particles ; adsorption isotherm of high - concentration ammonia - nitrogen on colloids matches Freundlich equation; while adsorption of ammonia - nitrogen on solid particles are linear isotherm, and adsorption capacity in silty sand colloid and solid particles is bigger than that in medium sand and silty soil.

关 键 词：含水介质 胶体 固体颗粒 氨氮 吸附 滨海地区 

分 类 号：X523[环境科学与工程—环境工程]