基质腐植酸对人工湿地处理Cr(Ⅵ)废水的影响  

Effects of Humic Acid on the Removal Capacity of Cr(Ⅵ)from Wastewater in Constructed Wetlands

作　　者：张杏锋[1,2,3] 梁烨禧 朱昱豪 王建生 高波 ZHANG Xingfeng;LIANG Yexi;ZHU Yuhao;WANG Jiansheng;GAO Bo(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Key Laboratory of Carbon Emission and Pollutant Collaborative Control for Higher Educations of Guangxi Zhuang Autonomous Region,School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;College of Tourism&Landscape Architecture,Guilin University of Technology,Guilin 541004,China;College of Plant and Ecological Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学环境科学与工程学院,广西环境污染控制理论与技术重点实验室,广西桂林541004 [2]桂林理工大学环境科学与工程学院,岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004 [3]桂林理工大学环境科学与工程学院,广西高校碳排放与污染物协同控制重点实验室,广西桂林541004 [4]桂林理工大学旅游与风景园林学院,广西桂林541004 [5]桂林理工大学植物与生态工程学院,广西桂林541004

出　　处：《环境科学与技术》2025年第4期113-123,143,共12页Environmental Science & Technology

基　　金：国家自然科学基金项目(42107025);广西新农科研究与实践项目(桂教高教〔2022〕47号:XNK2022006);广西矿冶与环境科学实验中心项目(KH2012ZD004);广西农业面源污染综合治理工程研究中心。

摘　　要：六价铬(Cr(Ⅵ))是一种危害极大的水体污染物,需要高效的水处理技术来降低Cr(Ⅵ)的水污染。该研究通过对人工湿地系统持续运行180 d,以确定腐植酸(HA)对Cr去除的影响,并监测了种植李氏禾的湿地中Cr的氧化还原过程。与对照处理相比,HA处理最终出水总Cr和Cr(Ⅵ)含量分别降低了90.36%和91.82%。HA显著促进了第2湿地区的植物生长,并提高了基质总Cr含量,但对第3和第4湿地区的植物生长和基质总Cr含量影响不大。基质和植物中Cr(Ⅵ)占总Cr的百分比范围分别为1.80%~35.78%和6.68%~40.63%。HA显著降低了湿地基质中Cr(Ⅵ)占总Cr的百分比,但对植物中Cr(Ⅵ)占总Cr的百分比影响不同。扫描电镜分析表明,HA改变了基质结构,使基质变得疏松。因此,HA可作为有效辅助人工湿地处理Cr(Ⅵ)污染废水的方法。Hexavalent chromium(Cr(Ⅵ))is a hazardous water contaminant,and efficient water treatment technologies are needed to reduce Cr(Ⅵ)water pollution.A 180 d study of constructed wetland systems was performed to determine the effect of humic acid(HA)on Cr removal and to monitor the redox process of Cr in wetlands planted with Leersia hexandra Swartz.The final effluent concentrations of total Cr and Cr(Ⅵ)during HA treatment were decreased by 90.36%and 91.82%,respectively,compared to the control treatment.HA significantly stimulated plant growth and increased the total Cr concentration of substrates in the second district,but it had little influence on plant growth and the total Cr concentration of substrates in the third and fourth wetland districts.The percentage of Cr(Ⅵ)to the total Cr in the substrates and plants were in the range of 1.80%~35.78%and 6.68%~40.63%,respectively.HA significantly reduced the percentage of Cr(Ⅵ)to the total Cr in wetland substrates,but it had a variable effect on the percentage of Cr(Ⅵ)to the total Cr of plant.Scanning electron microscope analysis showed that HA changed the substrate structure and made it looser.HA-assisted constructed wetlands could be an effective treatment for Cr(Ⅵ)polluted wastewater.

关 键 词：腐植酸 湿地植物 潜流人工湿地 Cr(Ⅵ)还原 

分 类 号：X173[环境科学与工程—环境科学]