河道底泥污染物释放控制试验研究  

Experimental Study on Release Control of River Sediment Pollutant

作　　者：占鑫杰[1] 许小龙 张青民 徐超 朱群峰[1] 杨守华[1] ZHAN Xinjie;XU Xiaolong;ZHANG Qingmin;XU Chao;ZHU Qunfeng;YANG Shouhua(Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing,Jiangsu 210022,China;Sinohydro Bureau 1st Co.,Ltd.,Dalian,Liaoning 116041,China;The 1st Engineering Ltd.of China Railway Wth Bureau Grouu,WuUan,Hubei 430000,China)

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210029 [2]中国水利水电第一工程局有限公司基础工程分局,辽宁大连116041 [3]中铁十一局集团第一工程有限公司,湖北武汉430000

出　　处：《水利与建筑工程学报》2021年第3期240-245,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家重点研发计划(2018YFC1508504);南京水利科学研究院中央级公益性科研院所基本科研业务费重点项目(Y320012)。

摘　　要：采用自主研制的环形水槽试验装置,研究了水动力条件下河道底泥的污染物释放特性,开展了原位覆盖和原位固化对底泥污染物释放控制效果的研究。试验结果表明:河道水流速度直接影响底泥污染物的释放特性;底泥随流速逐渐增大分别呈现"未起动"、"少量动"和"普遍动"三种状态。流速小于起动流速时,底泥未起动,上覆水中污染物释放量、浊度与静水条件接近。流速大于起动流速时,底泥大幅起动,上覆水中污染物释放量大幅增加。原位覆盖和原位固化均能有效控制底泥污染物的释放。与未处理相比,原位覆盖后的污染物控制率能达到60%~90%,砂层的压重作用避免底泥大规模起动,进而导致上覆水中的污染物含量大幅降低。原位固化后的污染物控制率为97%,但固化会导致上覆水p H升高使水体呈碱性。Based on the invented annular water tank test device,the pollutant release characteristics of river sediment under hydrodynamic conditions were studied,and the effects of in situ capping and in situ immobilization on the release control of sediment pollutants was carried out.The test results show that the river flow velocity directly affects the release characteristics of sediment pollutants.As the water flow rate continues to increase,the sediments are in three states:not started,small amount movement,and universal movement.When the flow rate is lower than the starting flow rate,the sediment is not started,and the pollutant release amount and turbidity in the overlying water are close to the hydrostatic conditions.When the flow rate is greater than the starting flow rate,the sediment is greatly started,and the amount of pollutants released from the overlying water is greatly increased.Both in situ capping and in situ immobilization can effectively control the release of sediment contaminants.Compared with untreated,the pollutant control rate after in situ capping can reach 60%~90%,and the weight of the sand layer avoids the large-scale start of the sediment,which leads to a significant decrease in the pollutant content in the overlying water.The contaminant control rate after in situ solidification was 97%,but the p H of the overlying water increased after solidification,and the water was alkaline.

关 键 词：河道底泥 污染物 释放控制 原位覆盖 原位固化 

分 类 号：TU472[建筑科学—结构工程]