研究报告
李绍贞,万俊锋,尹越,王岩,韩一帆.零价铁复合石英砂填料(ZVI-Sand)去除水体中不同形态砷[J].环境科学学报,2018,38(2):511-517
零价铁复合石英砂填料(ZVI-Sand)去除水体中不同形态砷
- Removal of aquatic arsenic in different forms by ZVI combined with quartz sand
- 基金项目：国家自然科学基金（No.21107100）
- 作者
- 单位
- 李绍贞
- 郑州大学化工与能源学院, 郑州 450001
- 万俊锋
- 郑州大学化工与能源学院, 郑州 450001
- 尹越
- 郑州大学化工与能源学院, 郑州 450001
- 王岩
- 郑州大学化工与能源学院, 郑州 450001
- 韩一帆
- 郑州大学化工与能源学院, 郑州 450001
- 摘要：利用零价铁复合石英砂（ZVI-Sand）制备砷吸附填料，对水体中2 mg·L-1 As（Ⅲ）或As（V）进行连续柱实验，研究了不同形态砷在ZVI-Sand填充柱内的去除效果及其沿柱层分布规律.实验结果表明：连续运行14 d，ZVI-Sand填充柱对As（Ⅲ）和As（V）的去除率均达到90%以上；15 d后，随着ZVI-Sand填充柱中ZVI腐蚀变为棕黄色，其对砷的去除能力明显降低.ZVI-Sand填充柱对As（V）的去除总量高于As（Ⅲ），累积计算得到的ZVI对砷吸附容量分别达到70 mg·g-1和57 mg·g-1.ZVI-Sand填充柱对As（Ⅲ）与As（V）的固定能力沿柱高呈先升高后降低的趋势.另外，实验过程中ZVI在去除As（V）的反应柱中出水总铁累积量大于去除As（Ⅲ）的反应柱.
- Abstract：Quartz sand mixed with zero-valent iron (ZVI) was selected as adsorptive material for arsenic (As) removal in this continuous experiment. Firstly, As(Ⅲ) or As(V) at 2 mg·L-1 in synthetic water was removed through ZVI-Sand column. Finally, the distribution of As entrapped in the ZVI-Sand column was investigated. The results show that over 90% of As(Ⅲ) and As(V) were sequestrated by the ZVI-Sand column during the initial 14 days, then the efficiency of As removal decreased obviously while the color of the ZVI-Sand column became brown due to the iron oxidation from the 15th day. The removal efficiency of As(V) was higher than As(Ⅲ) by the ZVI-Sand column. Their corresponding adsorption capactities were 70 mg·g-1 and 57 mg·g-1. Along the height of ZVI-Sand column, the fixation capacity of As firstly increased and then decreased. Additionally, the loss of total iron in the column for As(V) removal is more than thatfor As(Ⅲ) removal.
摘要点击次数： 1138 全文下载次数： 1773
