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.
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