...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Hazardous Materials >Treatment of groundwater polluted by arsenic compounds by zero valent iron
【24h】

Treatment of groundwater polluted by arsenic compounds by zero valent iron

机译：零价铁处理砷化合物污染的地下水

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Batch experiments were carried out to study the kinetics and efficiency of inorganic arsenic removal by zero valent iron (ZVI) powder, and as well as the effects of pH, anions, and humic material (HM) on this process. Moreover, column experiment was conducted for 31 days to treat arsenate solution of 500 μg As/L using waste iron chippings as filling. Batch experiments showed that both arsenate and arsenite compounds could be removed efficiently from simulated groundwater by ZVI under aerobic and relative anaerobic conditions. Aerobic condition was favorable to arsenic removal especially for arsenate, while arsenite could be removed more rapidly than arsenate in relative anaerobic condition. Oxidation of arsenite to arsenate by iron species in aerobic environment was observed, which is thought to be an important pathway of arsenite removal. In an unsealed system, the removal efficiency of both arsenate and arsenite decreased at higher pH value. In a sealed system, acidic and alkaline condition seemed to be favorable for arsenate and arsenite removal, respectively. Phosphate and low concentration sulfate caused a decrease in arsenate removal, while high concentration sulfate as well as nitrate caused slight increase in arsenate removal. Presence of HM in solution slightly inhibited arsenic removal. Arsenic removal efficiency in column study was influenced by flow rate and work period of the column. More than 98% of arsenate could be removed stably with a hydraulic resident time of 2 h at last, and the effluent meet the drinking water standard.
机译：进行了批处理实验，以研究零价铁（ZVI）粉末去除无机砷的动力学和效率，以及pH，阴离子和腐殖质（HM）对该工艺的影响。此外，以废铁屑作为填充物，进行了3​​1天的柱实验，以处理500μgAs / L的砷酸盐溶液。批处理实验表明，在有氧和相对厌氧条件下，ZVI均可有效地从模拟地下水中去除砷和亚砷化合物。好氧条件有利于砷的去除，尤其是砷的去除，而相对厌氧条件下砷的去除速度要比砷更快。在好氧环境中，铁物种将砷氧化为砷，这被认为是除砷的重要途径。在未密封的系统中，较高的pH值时砷酸盐和亚砷酸盐的去除效率都会降低。在密封系统中，酸性和碱性条件似乎分别有利于砷和砷的去除。磷酸盐和低浓度硫酸盐导致砷去除率降低，而高浓度硫酸盐和硝酸盐导致砷去除率略有增加。溶液中HM的存在会稍微抑制砷的去除。色谱柱研究中的除砷效率受色谱柱流速和工作时间的影响。最终在2 h的水力停留时间下，可以稳定地去除98％以上的砷酸盐，废水达到饮用水标准。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号