| 双金属和多金属系统对零价铁利用效率的改进 |
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| 引用本文： | 张道萍,孟凡生,王业耀,杨琦.双金属和多金属系统对零价铁利用效率的改进[J].环境科学研究,2016,29(9):1362-1369. |
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| 作者姓名： | 张道萍 孟凡生 王业耀 杨琦 |
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| 作者单位： | 1.中国环境科学研究院, 北京 100012 ;中国地质大学北京水资源与环境学院, 北京 100083 |
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| 基金项目： | 国家自然科学基金项目(51308520)；中央级公益性科研院所基本科研业务专项(2013-YKY-006) |
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| 摘 要： | 为解决Fe0-PRB(零价铁-渗透反应格栅)中Fe0利用效率低、易板结堵塞的问题,分别采用粒径为0.074 mm的试剂铁粉和0.150～0.270 mm的工业铁粉为反应介质,在铁粉表面负载不同比例的Cu或Ni制备Cu/Fe、Ni/Fe双金属和Cu/Ni/Fe多金属颗粒,研究Fe0、双金属和多金属系统去除Cr(Ⅵ)的性能、机制.结果表明:双金属和多金属系统的Cr(Ⅵ)去除率明显高于Fe0,试剂铁粉的Cr(Ⅵ)去除率明显高于工业铁粉.反应8 h达到平衡后,试剂铁粉和工业铁粉的Cr(Ⅵ)去除率仅为45%和20%,Cu/Fe双金属、Cu/Ni/Fe多金属的Cr(Ⅵ)去除率均能达到90%以上,以试剂铁粉和工业铁粉制备的Ni/Fe双金属的Cr(Ⅵ)去除率最高分别为76.6%和44.0%.不同负载率的双金属和多金属系统反应过程中可溶的ρ〔Cr(Ⅲ)〕较低.反应后溶液的pH从反应前的5.0升至10.0左右.反应初期ρ(TFe)(TFe为总铁)超过了0.30 mg/L,其余时间均达标.反应过程中ρ(Cu2+)均在0.40 mg/L以下,均未检测出Ni2+.研究显示,双金属和多金属系统显著提高了Fe0利用效率.
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| 关 键 词： | 六价铬[Cr(Ⅵ)] 零价铁(Fe0) 双金属系统 利用效率 |
| 收稿时间： | 2016/1/28 0:00:00 |
| 修稿时间： | 2016/4/13 0:00:00 |
Improvement of Zero Valent Iron Efficiency by Bimetallic System and Multi-Metallic System |
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| ZHANG Daoping,MENG Fansheng,WANG Yeyao and YANG Qi.Improvement of Zero Valent Iron Efficiency by Bimetallic System and Multi-Metallic System[J].Research of Environmental Sciences,2016,29(9):1362-1369. |
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| Authors: | ZHANG Daoping MENG Fansheng WANG Yeyao and YANG Qi |
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| Affiliation: | 1.Chinese Research Academy of Environmental Sciences, Beijing 100012, China ;School of Water Resources and Environment,China University of Geosciences, Beijing 100083, China2.Chinese Research Academy of Environmental Sciences, Beijing 100012, China3.China National Environmental Monitoring Center, Beijing 100012, China4.School of Water Resources and Environment,China University of Geosciences, Beijing 100083, China |
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| Abstract: | Abstract:To resolve the low zero valent iron(Fe0) use efficiency,barrier agglomeration and porous media blockage problems of Fe0-PRB(zero valent iron-permeable reactive barrier),Cu/Fe,Ni/Fe bimetallic and Cu/Ni/Fe multi-metallic power were prepared by loading different small amounts of copper or nickel on the 8 g reagent grade Fe0 powder(0.074 mm) and industrial scrap Fe0 powder(0.150-0.270 mm) respectively,and Cr(Ⅵ) removal performance and mechanism were also investigated for Fe0,Cu/Fe,Ni/Fe bimetallic and Cu/Ni/Fe multi-metallic PRB systems.The results showed that Cr(Ⅵ) removal efficiency of bimetallic and multi-metallic PRB system were significantly higher than that of Fe0-PRB,while that of reagent grade Fe0-PRB was obviously higher than that of industrial scrap Fe0-PRB.When the reaction was balanced after 8h operation,Cr(Ⅵ) removals were above 90% for Cu/Fe bimetallic and Cu/Ni/Fe multi-metallic PRB system based on two grades of Fe0,and that of reagent grade and industrial scrap Ni/Fe were 76.6% and 44.0%,respectively.However,Cr(Ⅵ) removal of the reagent grade and industrial scrap Fe0-PRB were only 45% and 20%.The dissolved Cr(Ⅲ) concentration was very low during operation of the bimetallic and multi-metallic PRB with different metal loading ratio.The pH increased from 5.0 to 10.0 after their operation.The total iron concentration was above 0.30 mg/L at the initial stage,but it could meet the limited value of standards for drinking water quality at other stages.During the operation,the Cu2+ concentration was less than 0.40 mg/L,while Ni2+ concentration was lower than its minimum detection limitation.Fe0 efficiency was significantly improved by bimetallic system and multi-metallic PRB system. |
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