摘要
为解决矿井水中F^(-)、Fe^(2+)、Mn^(2+)和化学需氧量(Chemical Oxygen Demand,COD)污染超标问题,采用煤矸石(Coal Gangue,CG)与铝盐改性粉煤灰(Al-FA)做吸附剂,通过动态柱试验探究CG和Al-FA对F^(-)、Fe^(2+)、Mn^(2+)和COD去除效果的影响。利用扫描电子显微镜(SEM)、X射线能谱(EDS)、X射线衍射(XRD)和傅里叶红外光谱(FT-IR)等手段对CG和Al-FA进行测试,以分析两种工业固废对复合污染矿井水的净化机理。试验结果显示:进水流速为4 mL/min,CG填充质量为200 g时,CG动态柱对Fe^(2+)和Mn^(2+)的吸附质量比最高分别为25.03 mg/g和11.73 mg/g;进水流速为4 mL/min,Al-FA填充质量为1000 g时,Al-FA动态柱对F^(-)和COD的吸附质量比最高分别为3.35 mg/g和14.22 mg/g。CG动态柱和Al-FA动态柱串联5 d时,对F^(-)、Fe^(2+)、Mn^(2+)和COD去除率皆高于95%。CG对F^(-)、Fe^(2+)和Mn^(2+)的去除主要通过静电引力吸附、离子交换和表面配位吸附作用。Al-FA主要通过Al3^(+)水解产生的多核羟基络合物的吸附电中和絮凝作用及离子交换作用去除F^(-)和COD。CG与Al-FA的联合使用,达到了同步去除F^(-)、Fe^(2+)、Mn^(2+)和COD的目的。研究为净化矿区矿井水提供了一种有效且环保的方法。
To solve the problem of excessive F^(-),Fe^(2+),Mn^(2+)and COD pollution in mine water,mining solid waste such as coal gangue(CG)and aluminum salt-modified fly ash(Al FA)were used as adsorbents,and the effects of CG and Al FA on the removal of F^(-),Fe^(2+),Mn^(2+)and chemical oxygen demand(COD)were investigated by dynamic column tests.The microscopic characterization of CG and Al FA was carried out using scanning electron microscopy(SEM),X-ray energy dispersive spectroscopy(EDS),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT IR),and the repair mechanism of two kinds of industrial solid waste on compound polluted mine water was analyzed.The experimental results show that the total adsorption amount increases with the increase of filling mass when CG dynamic column and Al FA dynamic column are adsorbed alone.When the inlet water flow rate is 4 mL/min,the filling mass of CG was 200 g,the adsorption mass ratios of CG dynamic column to Fe^(2+)and Mn^(2+)were 25.03 mg/g and 11.73 mg/g,respectively.When the influent flow rate was 4 mL/min and the filling mass of Al FA was 1000 g,the maximum adsorption mass ratio of F^(-)and COD are 3.35 mg/g and 14.22 mg/g,respectively.The removal rates of F^(-),Fe^(2+),Mn^(2+),and COD are all higher than 95%within 5 d when the CG dynamic column and Al FA dynamic column are connected in series.The microscopic results show that the removal of F^(-),Fe^(2+)and Mn^(2+)by CG is mainly through electrostatic gravitational adsorption,ion exchange,and surface ligand adsorption.Al FA mainly removes F^(-)and COD through the adsorption electro-neutralization flocculation of polynuclear hydroxyl complexes generated by Al3^(+)hydrolysis and ion exchange.The combined use of CG and Al FA achieves the simultaneous removal of F^(-),Fe^(2+),Mn^(2+),and COD,providing an effective and environmentally friendly way to remediate mine water in mining areas.
作者
李喜林
李健
孙璐
张雪娇
刘思初
LI Xilin;LI Jian;SUN Lu;ZHANG Xuejiao;LIU Sichu(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Fuxin Water Affairs Group Co.,Ltd.,Fuxin 123000,Liaoning,China;Huludao Comprehensive Administrative Law Enforcement Team for Ecological and Environmental Protection,Huludao 125000,Liaoning,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2024年第2期703-712,共10页
Journal of Safety and Environment
基金
国家重大研发计划重点专项(2017YFC1503100)
辽宁省教育厅科学研究面上项目(LJKZ0344)
辽宁省百千万人才工程项目(2018C01)。
关键词
环境工程学
矿井水
煤矸石
铝盐改性粉煤灰
动态试验
environmental engineering
mine water
coal gangue
aluminum salt-modified fly ash
dynamic adsorption
