摘要
针对大气氮氧化合物干湿沉降引起雨水中硝酸盐污染问题,围绕人类活动影响下的浅部包气带介质,基于物理吸附原理,选取柱状活性炭、粒状活性炭、粉细砂3种材料,设计了4组室内柱试验和两组场地原位试验。试验结果表明:土壤对硝态氮的吸附性能较弱,去除效果不明显;颗粒状活性炭与粉细砂等体积混合,则能有效提高入渗水中硝态氮去除率,最高可达92.5%,饱和吸附量为1.76 mg/g。介质材料成本低,技术简单易于操作;并从微观角度对硝态氮浓度出现先下降再上升最后趋于平衡的三阶段现象进行了阐述,探讨了其变化机制。为绿化区或停车场等地提供了可借鉴的吸附材料。
According to the principle of physical adsorption,the cylindrical activated carbon,granular activated carbon and silty-fine sand are selected to study the effects of aerobic nitrogen on the nitrate pollution in the rainwater. Four groups of indoor column experiments and two in-situ tests are made in the shallow unsaturated zone. The results show that the adsorption capacity of the soil for nitrate from aqueous solution is weak and the removal effect is not obvious. However,the removal rate of nitrate nitrogen in infiltration water is up to 92.5% when mixed with granular activated carbon and silty-fine sand. The saturation adsorption capacity is 1. 76 mg/g. The material cost is low and the technology is simple and easy to operate. From the microscopic point of view,the three-stage phenomenon of the first decline and then rise in the final balance trend of nitrate nitrogen concentration is analyzed. Its mechanism is also discussed in detail. Thus it can serve as a reference for the green area or parking area.
作者
刘佩贵
刘明朝
陈学群
李福林
刘彩虹
田婵娟
LIU Pei-gui;LIU Ming-chao;Chen Xue-qun;LI Fu-lin;LIU Cai-hong;TIAN Chan-juan(School of Civil Engineering, Hefei University of Technology, Hefei 230009, China;Water Conservancy Research Institute of Shandong Provinee,Jinan 250013 ,China)
出处
《中国农村水利水电》
北大核心
2018年第4期141-144,152,共5页
China Rural Water and Hydropower
基金
水利部技术示范项目(SF-201624)
国家自然科学基金项目(51509064)
国家自然科学基金项目(51309071)
关键词
硝酸盐
吸附
大气降水
包气带
nitrate
absorption
atmospheric precipitation
unsaturated zone
