环境工程学报2023，Vol.17Issue(12)：3880-3889,10.DOI:10.12030/j.cjee.202310110
基于柱状底泥污染状态的环保清淤深度确定:以长荡湖为例
Determination of environmental dredging depth based on the pollution status of columnar sediments:A case study of Changdang Lake
摘要
Abstract
This study takes the environmental dredging project of Changdang Lake(CDL)as an example,examining the pollution characteristics of pollutants(TN,TP,OM,and eight kinds of heavy metals)in the columnar sediments of the dredging area.A method for determining the dredging depth based on the thickness of the columnar sediment and the vertical distribution characteristics of pollutants was proposed.In the planned dredging area,the overall content of TN,TP and OM content in the sediments did not show clear trends with the change of depth,due to large variations in the contents in different sediment layers.The content of TN and TP ranged from 418 to 1 840 mg·kg-1 and 100 to 1 120 mg·kg-1,respectively.With increasing depth,the average content of TN showed a slight decrease,while that of TP showed a slightly increasing trend.In addition,the potential ecological risk index of heavy metals in the surface sediments was significantly higher than that in the bottom layer.Heavy metal contents in the sediments decreased with increasing depth.Among them,Zn had the highest content,ranging from 33.9 to 359 mg·kg-1,while Hg had the lowest content,ranging from 0.002 to 0.23 mg·kg-1.The contents of Cr,Cu,Ni,As,Cd,and Pb ranged from 24.9 to 114 mg·kg-1,4.3 to 95.0 mg·kg-1,12.4 to 55.8 mg·kg-1,1.02 to 17.9 mg·kg-1,0.05 to 7.78 mg·kg-1,and 6.28 to 59.9 mg·kg-1,respectively.Upon comprehensive analysis,the environmental dredging depth of CDL is set at 10 to 35 cm.It is recommended that areas with higher ecological risks of heavy metals in the sediments are prioritized during environmental dredging.Additionally,proper handling of sediments with a high Cd content and its tailwater is advised.关键词
环保清淤/清淤深度/总氮/总磷/重金属Key words
environmental dredging/dredging depth/total nitrogen/total phosphorus/heavy metals分类
资源环境引用本文复制引用
裴西平,王凯,汪院生,朱雨锋,唐文忠,陆海明,谢得宝,张洪..基于柱状底泥污染状态的环保清淤深度确定:以长荡湖为例[J].环境工程学报,2023,17(12):3880-3889,10.基金项目
国家自然科学基金资助项目(41877471,41877368) （41877471,41877368）
中央级公益性科研院所基本科研业务费项目(Y520001) （Y520001）
