Dynamic experiments of coal gangue-aluminum salt modified fly ash combined purification of compound polluted mine water
To solve the problem of excessive F-,Fe2+,Mn2+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-,Fe2+,Mn2+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 Fe2+and Mn2+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 1 000 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-,Fe2+,Mn2+,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-,Fe2+and Mn2+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-,Fe2+,Mn2+,and COD,providing an effective and environmentally friendly way to remediate mine water in mining areas.
万方数据
维普
