摘要
以城市黑臭河道底泥沉积物为研究对象,探讨其NH4＋-N吸附解吸性能,为城市黑臭河道内源氮控制提供技术参考.研究结果表明,在实验浓度范围（0 ～ 70 mg·L-1）内,随着NH4＋-N平衡浓度的升高,底泥对NH4＋-N的吸附量逐渐增加,且Freundlich模型适用于描述此热力学吸附现象,其n值为0.640,说明该热力学吸附过程较难进行;底泥对上覆水NH4＋-N的动力学吸附及解吸过程分别在30 min和5h内快速进行,而后均逐渐趋于平衡,二级动力学模型适用于描述底泥对NH4＋-N的动力学吸附与解吸过程;底泥NH4＋-N解吸性能强于吸附性能,具有“难吸附易解吸”的特性.
Taking the sediment of urban malodorous river as the research object, investigated the adsorption and desorption properties of ammonia-nitrogen in it, which could provide technical references for the control of endogenous nitrogen in urban malodorous river. The results showed that the adsorption capacity of ammonia-nitrogen in sediment increased with the increase of ammonia-nitrogen equilibrium concentration in the range of 0-70 mg/L. The Freundlich model was pertain to the thermodynamic adsorption and the value of n was 0.640, stating that the thermodynamic adsorption was difficult to occur. The dynamic adsorption of sediment on ammonia-nitrogen in overlying water finished in 30 minutes while desorption finished in 5 hours, then stayed in equilibrium state, and the second-order kinetic model was suitable for the two processes. The desorption ability of sediment on ammonia-nitrogen was stronger than the adsorption ability, indicating the property of easy to desorb but hard to adsorb.
出处
《上海化工》
CAS
2014年第5期1-3,共3页
Shanghai Chemical Industry
基金
国家自然科学基金项目(41101471
51278192)
上海市科委社会发展重点项目(12231201900)
中央高校基本科研业务费专项资金资助
关键词
黑臭河道
底泥
氨氮
吸附
解吸
Malodorous river
Sediment
Ammonia-nitrogen
Adsorption
Desorption
