球形海绵铁还原去除水中硝酸盐的静态研究  

Experimental Study of Nitrate Removal from Water by Spherical Sponge Iron

作　　者：冯艳平[1] 李俊国[1] 毕娜[1] 闫小林[1] 

机构地区：[1]河北理T大学冶金与能源学院,河北唐山063009

出　　处：《环境科学与技术》2008年第6期14-18,共5页Environmental Science & Technology

基　　金：河北省重点实验室建设项目(04360101B-5)

摘　　要：利用铁精粉造球和直接还原工艺制备了粒径1～5mm的多孔性球形海绵铁,对该球形海绵铁处理模拟硝酸盐污染水体进行了静态实验研究。结果表明:溶液pH值和溶解氧对硝酸盐去除率影响显著,pH值<2时硝酸盐去除率较高,而pH值>3时硝酸盐去除率很低;水体溶解氧能够促进硝酸盐的去除,如果不能向水体供氧,海绵铁几乎不能去除水体中的硝酸盐;无论硝酸盐初始浓度高低,固液比为1:10时海绵铁对硝酸盐的去除率最高,过高或过低的固液比都影响硝酸盐的去除;此外,硝酸盐初始污染浓度对去除率也影响显著,硝酸盐浓度<20mg-N/L时,硝酸盐的残余量保持在0.5mg-N/L左右,硝酸盐浓度较高时,去除率随硝酸盐初始浓度的增加而显著降低。This paper describes a bench scale experiment that relates to the preparation of porous spherical sponge iron with the diameters from 1 to 5 mm and a series of static adsorption tests. With the initial nitrate concentration of 20 mg-N/L, the nitrate is decreased to as low as 0.5 mg-N/L. The experiment reveals that pH and dissolved oxygen in water considerably affect the nitrate removal.

关 键 词：球形海绵铁 硝酸盐 还原去除 

分 类 号：X131.2[环境科学与工程—环境科学]