摘要:
为研究卫河流域河流-地下水系统中污染物迁移转化,采用静态吸附实验探究卫河底泥对水体中特征污染物的吸附特性。采集卫河新乡段河床沉积物样品作为土壤介质,模拟河流渗滤系统对特征污染物氨氮的吸附作用,得出特征污染物各组分的吸附动力学特征和热力学特征,并探讨温度、pH值等因素对研究区河床底泥吸附氨氮污染物的影响。研究结果表明: 在[0,10) mg/L浓度范围内,研究区河床底泥释放氨氮污染物,呈现解吸特性,在[10,50) mg/L浓度范围内,研究区河床底泥则呈现吸附特性; 在[0,60] min振荡时间内,随时间的增加,研究区河床底泥对氨氮污染物的吸附量逐渐上升,60 min后基本达到平衡; 通过对氨氮吸附热力学和吸附动力学研究发现,研究区河床底泥对氨氮污染物的吸附更符合Freundlich吸附模型及一级动力学模型; pH值在[2,8]范围内,随着pH值的增大,研究区河床底泥对氨氮污染物的吸附量增加; 研究区河床底泥对氨氮污染物的最大吸附容量随温度的升高而减小。研究成果可为研究区河道黑臭水体的治理提供技术支撑,同时为高效控制卫河黑臭河道内源氮的释放提供技术参考。
Abstract:
In order to study the migration and conversion of pollutants in river-groundwater system of Wei River Basin, the authors adopted the static adsorption experiment to explore the adsorption characteristics of the feature pollutants in Wei River by the riverbed sediment. The river bed sediment samples in Xinxiang section of Wei River were collected as the soil medium, and the adsorption effect of the river adsorption system on the feature pollutants ammonia nitroger was simulated. The adsorption thermodynamics and kinetics characteristics of each component in the feature pollutants were obtained, and the effects of temperature, pH value and other factors on ammonia nitrogen pollutants adsorption by the riverbed sediment in the study area were explored. The results show that ammonia nitrogen pollutants is released from the riverbed sediment in the study area at [0,10) mg/L, showing desorption characteristics, and that the riverbed sediment shows adsorption characteristics in the study area at [10,50) mg/L. In the oscillation time of [0,60] min, the adsorption capacity of ammonia nitrogen by the river sediment in the study area gradually increases with the increase of time, and it reaches equilibrium after 60 min. The adsorption thermodynamics and kinetics of ammonia nitrogen pollutants adsorption show that the adsorption of ammonia nitrogen the river sediment in the study area is in accordance with the Freundlich adsorption model and the first-order kinetic model. In the pH value range of [2,8], the adsorption capacity of ammonia nitrogen pollutants by the riverbed sediment in the study area increases with the increase of pH value. The maximum adsorption capacity of ammonia nitrogen pollutants by riverbed sediment in the study area decreases with the increase of temperature. This research could provide technical support for the treatment of black and odorous water bodies in river channels, and technical reference for the efficient control of ammonia and nitrogen in black and odorous river channels.
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