煤矸石对矿井水中溶解性有机物动态吸附去除性能

Dynamic adsorption of dissolved organic matter in mine water by coal gangue

以煤矸石为吸附剂,并以溶解性有机物(Dissolved organic matter,DOM)作为吸附质,进行吸附柱动态实验,探究DOM浓度、矿井水矿化度、煤矸石粒径及进水流速对煤矸石吸附去除DOM的影响.结果表明:煤矸石对DOM的吸附主要发生在煤矸石表面,其表面羟基及孔隙与DOM中各种官能团相结合形成配合物;低矿化度、小粒径煤矸石和低进水流速能够延长煤矸石吸附饱和时间,且维持一个较高的去除率,Thomas吸附模型能够很好的描述煤矸石动态吸附DOM过程.

In this paper,the coal gangue was taken as the adsorbent to adoptively remove dissolved organic matter(DOM).The dynamic experiment of the adsorption column was carried out to explore the influence of the different initial DOM concentration,different mineralization degree,different particle sizes and different flow rates on DOM removal by coal gangue.The results show that DOM adsorption on coal gangue mainly occured on the surface of coal gangue,and the surface hydroxyl and pores form complexes with various functional groups in DOM.Low mineralization,small particle sizes and slow flow rates can prolong the coal gangue adsorption saturation and maintain a higher DOM removal.Thomas adsorption model can well describe the dynamic adsorption process of DOM by coal gangue.