Abstract

Groundwater resources in North China are scarce, and nitrogen pollution, especially ammonia nitrogen pollution, in groundwater is a severe environmental challenge for this area. In this context, the effects of differentaquifer media on ammonia nitrogen adsorption in Hutuo river plain, north China were investigated in the study. In particular, the aim of this study was to investigate the influence of Eh, clay particle and organic material content on ammonia nitrogen adsorption. The study found that Eh affected the migration and transformation of NH₄⁺-N in aquifer media. When the clay particle content was less than or equal to 14%, the NH₄⁺-N adsorption reached the equilibrium state in 210 min. The adsorption was the maximum when the clay content was 14% in the study. The NH₄⁺-N adsorption of by three sand types increased with the increase of clay content. Meanwhile, the concentration of NO₂⁻-N and NO₃⁻-N increased, though the change was not significant. The increase in the organic matter content enhanced the oxidation of the medium, and pH value continued to decline, leading to H⁺ and NH₄⁺ forming a competitive relationship in the solution. However, the NH₄⁺-N adsorption capacity gradually increased as the organic matter consisting of more cation adsorption sites.

摘要

华北地区的地下水资源稀缺，地下水中的氮污染（尤其是氨氮污染）是该地区面临的严峻环境挑战。在此背景下，研究了不同含水层介质对华北虎tu河平原氨氮吸附的影响。特别地，该研究的目的是研究Eh，粘土颗粒和有机物含量对氨氮吸附的影响。研究发现，Eh影响了含水层介质中NH ₄ ⁺ -N的迁移和转化。当粘土颗粒含量小于或等于14％时，NH ₄ ⁺-N吸附在210分钟内达到平衡状态。在研究中，当粘土含量为14％时，吸附量最大。随着黏土含量的增加，三种砂对NH ₄ ⁺ -N的吸附增加。同时，NO ₂ ^-- N和NO ₃ ^-- N的浓度增加，尽管变化不显着。有机物含量的增加促进了介质的氧化，pH值持续下降，导致H ⁺和NH ₄ ⁺在溶液中形成竞争关系。但是，NH ₄ ⁺随着有机物由更多的阳离子吸附位点组成，-N吸附容量逐渐增加。