使用饮用水处理厂残留物的吸附剂从酸性矿井排水中去除硫酸:合成,表征和综合分析
Satish Chandra Bhuyan1, Pallavi Behera2, Himanshu Bhushan Sahu2
1Department of Mining Engineering, National Institute of Technology, Rourkela, 769008, India. 520MN6002@nitrkl.ac.in.
Environmental geochemistry and health
|August 21, 2025
概括
饮用水处理厂的残留物 (DWTPR),特别是当用酸盐修饰时,可以有效地从酸性矿井排水 (AMD) 中去除硫酸和重金属. 这种可持续的方法有助于矿山废水和水处理.
科学领域:
- 环境工程
- 处理水
- 吸附科学
背景情况:
- 由于高酸度和污染物含量,酸性矿井排水 (AMD) 带来了重大环境挑战.
- 传统的AMD治疗方法可能是昂贵的,并产生二次浪费.
- 饮用水处理厂残留物 (DWTPR) 是一种大量的废物,具有污染物修复的潜力.
研究的目的:
- 调查原始和修改的DWTPR在合成和真实AMD中硫酸去除的有效性.
- 为了比较EDTA修饰的DWTPR和素修饰的DWTPR的性能.
- 分析物理化学特性和优化硫酸盐去除参数.
主要方法:
- 使用SEM,EDS,XRD,FTIR,BET和pHZPC进行吸附剂的表征.
- 通过不同的初始度,剂量,接触时间和pH进行的硫酸盐去除实验.
- 吸附等温 (兰穆尔) 和动力 (伪二次) 建模,以及热力学分析.
主要成果:
- 在优化条件下 (pH 7. 1, 5 g/100 mL剂量,接触时间300分钟) 获得了酸盐最大去除率 (77. 93%).
- 基托桑-DWTPR从真实AMD样本中显著清除硫酸盐 (高达77.93%) 和其他污染物 (Fe,Mn,Cu,Ni,Al) 高达90%.
- 吸附遵循兰格穆尔等热和伪二次动力学,表明一种自发的,外热的,低随机性的过程.
结论:
- 基托桑修饰显著增强了DWTPR的吸附性质,以去除硫酸盐和中和AMD.
- 对于处理酸性矿井排水而言,DWTPR,特别是基托改性形式,是一种可行且可持续的吸附剂.
- 在这个过程中吸附和化学沉是污染物去除的关键机制.
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