School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China E-mail:
Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Water Sci Technol. 2022 Jun;85(11):3225-3239. doi: 10.2166/wst.2022.156.
Acid mine drainage (AMD) is a special kind of acidic wastewater produced in the process of mining and utilization. In this study, AMD was treated using the adsorption method. Domestic waste was prepared by pyrolysis, and the resulting waste pyrolysis ash adsorbent was studied experimentally by a static adsorption test to treat metal ions in AMD. The results showed that the maximum adsorption amounts of Zn, Cu, Mn, Fe, Pb, and Cd reached 0.425, 0.593, 0.498, 18.519, 0.055, and 0.039 mg/g, respectively, when the amount of pyrolysis ash was added at 30 g/L, the initial pH of the water was 4.1 and the reaction time was 150 min. It was found that the waste pyrolysis ash could be reused at least three times by using NaS as the regeneration agent. The SEM and BET characterization results prove that its large specific surface areas and well-developed pore structures have the potential to promote the adsorption of metal ions. The pseudo-second-order kinetic equation and Freundlich adsorption isotherms fit the adsorption process well, and the experiments reveal that the metal ions in AMD are well treated by waste pyrolysis ash through adsorption, flocculation and chemical precipitation. Waste pyrolysis ash has great potential for the treatment of acid mine drainage, providing a new approach to solid waste disposal and new ideas for water treatment as a low-cost alternative material.
矿山酸性废水（AMD）是采矿和利用过程中产生的一种特殊酸性废水。本研究采用吸附法处理 AMD。通过热解制备了废热解灰吸附剂，并通过静态吸附试验对其进行了实验研究，以处理 AMD 中的金属离子。结果表明，当添加量为 30g/L、初始 pH 值为 4.1、反应时间为 150min 时，废热解灰对 Zn、Cu、Mn、Fe、Pb 和 Cd 的最大吸附量分别达到 0.425、0.593、0.498、18.519、0.055 和 0.039mg/g。发现使用 NaS 作为再生剂，废热解灰至少可以重复使用三次。SEM 和 BET 特征化结果证明，其较大的比表面积和发达的孔结构具有促进金属离子吸附的潜力。准二级动力学方程和 Freundlich 吸附等温线很好地拟合了吸附过程，实验表明，废热解灰通过吸附、絮凝和化学沉淀很好地处理了 AMD 中的金属离子。废热解灰在处理矿山酸性废水中具有很大的潜力，为固体废物处理提供了一种新方法，为水处理提供了一种低成本替代材料的新思路。
