摘要
作者将活性炭与零价铁粉混合球磨,制备了一种用于内源污染物阻控的微米级碳铁复合材料(AAC/Fe)。研究结果表明,以碳铁质量比为5∶1制备的材料,能够在中性溶液中实现铁离子的溶出,并显著降低磷的浓度。沉积物柱模拟实验进一步表明,以覆盖方式施用AAC/Fe复合材料(1.19 kg/m^(2)用量),能够在沉积物与水体界面形成“阻控层”,有效阻止沉积物中磷、有机物等污染物向上覆水中扩散,适用于需要快速阻控内源污染、实现上覆水水质达标等应用场景;而注入方式能够实现材料与沉积物的充分混合,AAC/Fe材料中的铁粉和活性炭粉可以通过化学反应和物理吸附等方式,显著削减沉积物相中间隙水的污染物浓度,实现源头减量。AAC/Fe施加后,造成了沉积物微生物种群结构变化,但其长期影响还需进一步评估。
A micron-size iron/carbon composite material(AAC/Fe)was prepared by ball milling of activated carbon and reactive iron powder,and it was used for the control of internal pollutants.The results show that AAC/Fe(5∶1 mass ratio)can achieve the dissolution of iron ions in neutral solution and significantly reduce the dissolved phosphorus.The sediment column simulation experiment further showed that the covering applying method of composite material(1.19 kg/m^(2))can form a“blocking layer”at the interface between sediment and overlying water,effectively preventing the diffusion of phosphorus,organic matters in sediments to the overlying water,which is suitable for application scenarios that need to quickly prevent internal pollution and achieve the quality standard of overlying water.The injection method can realize the full mixing of mate-rials and sediments,and the ball milled iron and activated carbon powders in AAC/Fe materials can significantly reduce the concentration of pollutants in the pore water in the sediment phase through chemical reaction and physical adsorption,so as to achieve pollution source reduction.The application of AAC/Fe caused changes in sediment microbial population structure,but its long-term effects need to be further evaluated.
作者
孙凌凯
罗坤
辛琨
何东恺
崔佳鑫
毛旭辉
SUN Lingkai;LUO Kun;XIN Kun;HE Dongkai;CUI Jiaxin;MAO Xuhui(Changjiang Survey,Design and Research Institute Co.,Ltd.,Wuhan 430010,China;School of Resources and Environmental Science,Wuhan University,Wuhan 430079,China)
出处
《环境科学与技术》
北大核心
2025年第6期146-155,共10页
Environmental Science & Technology
基金
湖北省自然科学基金项目(三峡创新发展联合基金,2023AFD193)。
关键词
内源污染
沉积物
原位修复
碳铁材料
上覆水
间隙水
internal pollution
sediment
in-situ remediation
carbon/iron material
overlying water
pore water
作者简介
孙凌凯(1980-),男,高级工程师,硕士,主要从事水利工程与水环境治理工作,(电子信箱)523007875@qq.com;通讯作者:毛旭辉,(电子信箱)clab@whu.edu.cn。
