蛭石改性球磨零价铁强化生态沟渠对农业面源污染截留研究  

Effect of vermiculite modified ball mill zero-valent iron on interception of agricultural non-point source pollution in ecological ditch

作　　者：牟永明 Mu Yongming(China Railway 11 th Bureau Group Fifth Engineering Co.,Ltd.,Chongqing 400037)

机构地区：[1]中铁十一局集团第五工程有限公司,重庆400037

出　　处：《环保科技》2025年第1期43-50,共8页Environmental Protection and Technology

摘　　要：生态沟渠技术已成为农业面源污染治理的先锋技术,本文在传统的生态沟渠构建形式的基础上,研究了添加铁基复合材料后生态沟渠对典型农业面源污染物的去除效果。结果显示,将微米零价铁与蛭石以3:1的质量比进行球磨改性,获得以零价铁为中心,表面铁氧化物和蛭石紧密团聚的铁基复合材料,表面粗糙、褶皱增多,比表面积增大。以0.6 g/L的投加量将铁基复合材料投加入生态沟渠中,提升了生态沟渠系统对NH_(4)^(+)-N、TN、TP、Cr^(6+)的去除率。静态条件下,相比于未强化生态沟渠系统对TN、TP、Cr^(6+)的去除率分别提高了8.2%~14.8%、4.4%~6.8%、1.7%~2.4%。动态条件下,相比于未强化生态沟渠系统对NH_(4)^(+)-N、TN、TP、Cr^(6+)的去除率分别提高了15.9%~30.6%、15%~19.2%、13.3%~13.6%、0.2%~9.3%。通过添加蛭石改性球磨零价铁,实现了强化生态沟渠对农业面源污染截留效果的目的,增强了生态沟渠系统的稳定性,可为农业面源的治理提供技术支撑。Agricultural land pollution has become an important cause of water pollution,and ecological ditch technology has become an important technology of agricultural land management.In this paper,the removal effect of adding metal composite materials on agricultural non-point sources by ecological ditches was studied.The results showed that the micron zero-valent iron was modified with vermiculite by ball milling at a mass ratio of 3:1 to obtain an iron-based composite centered on zero-valent iron with tightly agglomerated surface iron oxides and vermiculite,which had a roughened surface,increased folds,and increased specific surface area.The iron matrix composites were injected into the ecological ditch at a dosage of 0.6 g/L,which enhanced the removal of NH_(4)^(+)-N,TN,TP,and Cr^(6+)from the ecological ditch system.Under static conditions,the removal rates of NH_(4)^(+)-N,TP,and Cr 6+were increased by 8.2%-14.8%,4.4%-6.8%,and 1.7%-2.4%,respectively,compared with those of the unreinforced ecological ditch system.Under dynamic conditions,the removal rates of NH_(4)^(+)-N,TN,TP,and Cr^(6+)were increased by 15.9%-30.6%,15%-19.2%,13.3%-13.6%,and 0.2%-9.3%,respectively,compared with those of the unreinforced ecological ditch system.By adding vermiculite-modified ball-milled zero-valent iron,the purpose of reinforcing the retention effect of ecological ditches on agricultural non-point source pollution was realized,and the stability of the ecological ditch system was enhanced,which can provide technical support for the management of agricultural non-point sources.

关 键 词：生态沟渠 蛭石 球磨零价铁 农业面源污染水分离 

分 类 号：X592[环境科学与工程—环境工程]