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引用本文:黄艳虹,高凡,郭伟,郭家选,王敬贤,许佟.基于梯度扩散薄膜技术(DGT)的氨基生物炭覆盖沉积物水界面铜、铅释放研究.湖泊科学,2020,32(1):58-69. DOI:10.18307/2020.0106
HUANG Yanhong,GAO Fan,GUO Wei,GUO Jiaxuan,WANG Jingxian,XU Tong.Release of copper and lead from the sediment-water interface under in-situ coverage of amino biochar via Diffusive Gradients in Thin-films (DGT). J. Lake Sci.2020,32(1):58-69. DOI:10.18307/2020.0106
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基于梯度扩散薄膜技术(DGT)的氨基生物炭覆盖沉积物水界面铜、铅释放研究
黄艳虹1, 高凡1,2, 郭伟3, 郭家选1,2, 王敬贤1, 许佟1
1.农业农村部华北都市农业重点实验室/北京农学院资源与环境系, 北京 102206;2.北京林果业生态环境功能提升协同创新中心, 北京 102206;3.南方科技大学环境科学与工程学院, 深圳 518055
摘要:
湖泊沉积物的重金属污染防治一直是环境领域的热点问题.本研究采用氨基生物炭作为覆盖材料,利用梯度扩散薄膜技术(DGT),研究了上覆水不同pH及水流扰动条件下Cu(Ⅱ)、Pb(Ⅱ)在沉积物水界面间的原位释放特征,以及氨基生物炭对湖泊沉积物重金属污染的原位修复效果.研究结果表明,在0 r/min或100 r/min水动力条件下,可移动态重金属离子有不断由沉积物向其他介质扩散的趋势,1.81 kg/m2的氨基生物炭覆盖强度可降低Cu(Ⅱ)、Pb(Ⅱ)释放通量达89%以上,有效减小了水环境中重金属的潜在生态风险.在pH=5的酸性及pH=9的碱性水环境中原位修复效果较差,水体中大量的H+或络合物均会削弱氨基生物炭对重金属离子的吸附,当上覆水在pH=7的中性条件时原位修复效果最佳.100 r/min水流扰动下的上覆水Cu(Ⅱ)、Pb(Ⅱ)含量在释放平衡时较0 r/min条件下高出0.036~0.096 μg/mL,说明高强度的水流扰动易造成覆盖材料的扬起和浮动,导致覆盖材料与重金属发生解吸.
关键词:  铜(Ⅱ)  铅(Ⅱ)  氨基生物炭  原位修复  梯度扩散薄膜技术(DGT)
DOI:10.18307/2020.0106
分类号:
基金项目:国家自然科学基金项目(31471837,41101467)和深圳市科创委项目(JCYJ20170817110953833)联合资助.
Release of copper and lead from the sediment-water interface under in-situ coverage of amino biochar via Diffusive Gradients in Thin-films (DGT)
HUANG Yanhong1, GAO Fan1,2, GUO Wei3, GUO Jiaxuan1,2, WANG Jingxian1, XU Tong1
1.Key Laboratory for Northern Urban Agriculture of Ministry of Agriculture and Rural Affairs/Department of Resources and Environment, Beijing University of Agriculture, Beijing 102206, P. R. China;2.Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, Beijing 102206, P. R. China;3.School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China
Abstract:
The prevention and control of heavy metal pollution in lake sediments has always been a hot issue in the environmental field. In this study, amino modified biochar was used as the covering material and Diffusive Gradients in Thin-films (DGT) was used to monitor the characteristics of in-situ release of Cu(Ⅱ) and Pb(Ⅱ) at the sediment-water interface with different pH and water flow disturbance conditions. The in-situ remediation effect of amino modified biochar on heavy metal pollution was also analyzed. The results show that the mobile heavy metal ions have a tendency to diffuse from the sediment to other media at 0 r/min or 100 r/min hydrodynamic conditions. The cover strength of 1.86 kg/m2 for amino modified biochar can reduce the release flux of Cu (Ⅱ) and Pb (Ⅱ) over 89%, which effectively reduces the potential ecological risk of heavy metals in the water environment. A large amount of H+ or complex in the water will weaken the adsorption of heavy metal ions by amino biochar. When the overlying water is in neutral condition with pH=7, the in-situ remediation effect is the best. The content of Cu(Ⅱ) and Pb(Ⅱ) in the overlying water under the disturbance of 100 r/min water flow is 0.036-0.096 μg/mL higher than that at 0 r/min when the equilibrium is released. The high-intensity water flow disturbance easily caused the lifting and floating of the covering material, resulting in desorption of heavy metals escaping from the covering material.
Key words:  Copper(Ⅱ)  lead(Ⅱ)  amino modification of biochar  in-situ remediation  Diffusive Gradients in Thin-films (DGT)
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