| 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 |
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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[J].湖泊科学,2020,32(1):58-69. |
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| 作者姓名： | 黄艳虹 高凡 郭伟 郭家选 王敬贤 许佟 |
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| 作者单位： | 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;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;北京林果业生态环境功能提升协同创新中心,北京102206;南方科技大学环境科学与工程学院,深圳518055 |
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| 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. |
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| 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/m 2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0.036~0.096μg/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.
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| 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) |
| 收稿时间： | 2019/4/29 0:00:00 |
| 修稿时间： | 2019/7/25 0:00:00 |
Release of copper and lead from the sediment-water interface under in-situ coverage of amino biochar via Diffusive Gradients in Thin-films (DGT) |
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| HUANG Yanhong,GAO Fan,GUO Wei,GUO Jiaxuan,WANG Jingxian and 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].Journal of Lake Science,2020,32(1):58-69. |
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| Authors: | HUANG Yanhong GAO Fan GUO Wei GUO Jiaxuan WANG Jingxian and XU Tong |
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| Institution: | 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,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;Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, Beijing 102206, P. R. China,School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China,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;Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, Beijing 102206, P. R. China,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 and 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 |
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| 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/m 2 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 0.036-0.096μg/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. |
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| Keywords: | Copper(Ⅱ) lead(Ⅱ) amino modification of biochar in-situ remediation Diffusive Gradients in Thin-films(DGT) |
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