pH值影响下NH_4^+-N在弱透水层迁移转化的实验研究  

Experimental study on migration and transformation of NH_4^+-N in aquitard under influence of pH

作　　者：李绪谦[1] 朱雅宁[1] 于光[2] 谢雪[1] 宋爽[1] 

机构地区：[1]吉林大学环境与资源学院,吉林长春130026 [2]空军航空大学特种专业系,吉林长春130022

出　　处：《水资源保护》2011年第4期10-14,共5页Water Resources Protection

基　　金：国家自然科学基金(40872154)

摘　　要：通过高压土柱实验模拟不同pH条件下地下水中NH4+-N透过弱透水层越流迁移的过程,并对其可能的影响因素及迁移机理进行讨论分析。结果表明:在较短的实验周期内(168 h)及相对缺氧的环境中,低浓度的NH4+-N溶液通过弱透水层后绝大部分被去除,其主要作用是吸附,生物作用只占很小一部分;pH大于7时弱透水层中的NH4+-N较易被吸附和发生生物作用,利于NH4+-N的去除;pH条件易影响钙镁离子对NH4+-N竞争吸附。High-pressure soil column experiments were constructed to simulate the process of NH4＋-N migration in the aquitard under different pH conditions, and to discuss the potential influencing factors and migration mechanism.The experimental results indicate that in a short experimental period（168 h） and a relatively hypoxic environment,as the low-concentration NH4＋-N solution permeates the aquitard,the vast majority of ammonia is removed mainly by adsorption and partly by biological reaction.When the pH value is greater than 7,NH4＋-N in the aquitard is easier to be adsorbed and cause biological reactions,which helps remove NH4＋-N.The pH conditions is likely to affect the competitive adsorption of NH4＋-N in calcium and magnesium ions.

关 键 词：NH4+-N 弱透水层 迁移转化 PH 

分 类 号：X523[环境科学与工程—环境工程]