净水技术2025，Vol.44Issue(5)：159-166,8.DOI:10.15890/j.cnki.jsjs.2025.05.017
氮磷污染河湖底泥疏浚深度判定方法
Determination Method of Dredging Depth of Nitrogen and Phosphorus Contaminated Sediments in Rivers and Lakes
摘要
Abstract
[Objective]There is no unified standard for determining the environmental dredging depth of river and lake sediments,and existing method each have their own advantages and limitations.This study aims to propose a rapid,accurate,and applicable method for determining the dredging depth of nitrogen and phosphorus polluted sediments in rivers and shallow lakes.[Methods]Based on research into the influence law of overlying water composition on nitrogen and phosphorus release from sediments,this study optimized and improved existing dredging depth determination method.A new method for determining the dredging depth of nitrogen and phosphorus polluted sediment was proposed,which named"adsorption and desorption equilibrium method based on inflection point modification",and compared verified by collected samples from a planned dredging area of a river.[Results]The result showed that the higher the concentration of overlying water was,the lower the nitrogen and phosphorus release intensity of the sediment would be.Under the same concentration condition,the release intensity of the sediment in natural water was greater than that of the artificially configured water sample.Through comparing testing,the conclusion of the new method was similar to that obtained by the traditional adsorption and desorption method and the inflection point method,and the new method saved 85％of the testing amount compared with the traditional adsorption and desorption method.[Conclusion]This new method combines the advantages of the inflection point method and the traditional adsorption-desorption equilibrium method.Through method improvements,it better simulates natural water environments and significantly reduces the number of required experimental analyses,making it a rapid and accurate approach for determining dredging depth in nitrogen and phosphorus polluted sediments.In practical engineering applications,factors such as hydrological characteristics,water body function planning,and project schedule requirements should be comprehensively considered when selecting a dredging depth determination method.关键词
底泥疏浚/疏浚深度/氮磷释放/吸附解吸/拐点Key words
sediment dredging/dredging depth/nitrogen and phosphorus release/adsorption and desorption/inflection point分类
资源环境引用本文复制引用
孟英杰,康兴生,孙建璋,范洪凯,黄丽珠,周国锋..氮磷污染河湖底泥疏浚深度判定方法[J].净水技术,2025,44(5):159-166,8.基金项目
山东省重点研发计划(重大科技创新工程)项目(2020CXGC011406) （重大科技创新工程）
