铁矿渣去除水中砷实验研究

An Experimental Study on Removing Arsenic from Water Using Iron Slag

铁矿渣是常见的廉价固体废弃物之一,以铁矿渣为吸附材料,运用环境扫描电子显微镜和X-射线衍射仪分析其形貌和矿物成份,进行静态批实验和动态土柱吸附实验。研究表明铁矿渣对高砷水中五价砷的吸附符合Langmuir吸附等温曲线,温度对吸附砷效果影响明显,较高温度有利于砷的吸附(40℃>30℃>20℃),温度主要影响吸附过程中孔隙扩散阶段的吸附速率,高砷水呈酸性时吸附效果优于碱性条件。土柱吸附实验当进水砷为1829.2μg/L时,进水体积比为1200倍时,出水浓度仍低于50μg/L,且出水的铁、铜、银、锌等金属离子均未超标。该论文为进一步探究铁矿渣对高砷水中砷的去除提供了实验研究支撑。

This paper describes a bench scale experiment with a purpose to looking for a kind of inexpensive material to tackle health hazards from high As-containing groundwater. Common iron slag was used and tested to remove arsenic from water, on which a series of batch adsorption experiment and a dynamic column experiment were conducted. Results indicate that, as a general, the isothermal adsorption curve conforms to the Langmuir equation; that within a certain range of 20-40℃, the higher the temperature, the better removal of As would be obtained; and that water in acidic condition （pH〈5） facilitates adsorption of As on the iron slag. Moreover, different kinds of equipment are used for studying iron slag samples including X-ray diffraction for characterization, SEM for micro-morphology and ICP-AES for metal elements analysis.