化工进展Issue(7)：2060-2064,5.DOI:10.16085/j.issn.1000-6613.2015.07.042
磷酸铵镁沉淀与沸石吸附组合工艺处理海水中的氨氮
Ammonia nitrogen removal from seawater by magnesium ammonium phosphate(MAP) precipitation combined with zeolite adsorption
摘要
Abstract
The nutrients delivery from land usage and anthropogenic emissions in quantity is the main reason for euthrophication of coastal seawater in China. Nitrogen(N)and phosphorus(P)in seawater are hard to remove by conventional biological treatments. Due to its high ion exchange capacity and selectivity,natural zeolite has been one of the most efficient and economical water treatment materials. This paper studied the dynamic adsorption behavior of ammonium nitrogen from seawater,expressed as breakthrough curve,using natural zeolite bed filter. The magnesium ammonium phosphate(MAP) precipitation and zeolite adsorption combined process was performed to remove ammonia nitrogen from seawater. Experimental results showed that the adsorption reached equilibrium in a shorter period of time at higher flow rate lower and filter column height. It is indicated that the dynamic adsorption of ammonia nitrogen from seawater on zeolite filter was best represented by the Logistic model. The concentration of ammonium nitrogen in seawater dropped to a low level when treated with MAP precipitation combined with zeolite adsorption. The suitable filtration conditions of natural zeolite bed filter were as the following:The filter speed was 20L/h,and the filter column height was 100cm. The ammonia adsorption capacity of natural zeolite could be restored by using calcination or NaCl immersion. After treated by calcination at 300℃for 2h and immersed in 1.5mol/L NaCl solutions for 24h,the regeneration rate of natural zeolite was 99.38% and 122.22% respectively.关键词
磷酸铵镁/沸石/海水/氨氮/去除效果Key words
magnesium ammonium phosphate/zeolite/seawater/ammonium nitrogen/removal efficiency分类
资源环境引用本文复制引用
王文华,张晓青,邱金泉,司晓光,成玉,王静,张雨山..磷酸铵镁沉淀与沸石吸附组合工艺处理海水中的氨氮[J].化工进展,2015,(7):2060-2064,5.基金项目
中央级公益性科研院所基本科研业务费专项资金（K-JBYWF-2013-G3）、海洋公益性行业科研专项（201105026）及国家海洋局青年海洋科学基金（2013542）项目。 （）
