煤矸石充填重构土壤后多环芳烃的淋溶特征研究

Study on leaching characteristics of polycyclic aromatic hydrocarbons after filling soil of coal gangue

以大同煤矿集团忻州窑矿煤矸石为研究对象,采用动态淋溶装置模拟煤矸石中所含多环芳烃在雨水淋溶作用下的迁移,利用化学检测手段对淋溶前后煤矸石中所含多环芳烃进行定量分析,从而找到煤矸石充填重构土壤后多环芳烃的迁移特征。研究表明,煤矸石中所含多环芳烃在雨水淋溶作用下随着埋藏时间和覆土深度的增加逐渐全部迁移到周围土壤中,其迁移数量为中分子量物质<小分子量物质<高分子量物质,埋藏时间较覆土深度对多环芳烃的迁移影响更占优,在覆土4a埋藏50cm时,模拟结果与实际结果最大相对误差8.8%,说明该动态淋溶模拟装置的可靠性较高。

The coal gangue in Xinzhou mine of Datong Coal Mine Group is used as the research object.The migration of polycyclic aromatic hydrocarbons(PAHs)is studied by dynamic leaching device in the process of refactoring soil using coal gangue.The content of PAHs in coal gangue is measured by chemical detection method,so as to find the migration characteristics after filling soil of it.The results show that the PAHs containing in coal gangue are gradually transferred to the surrounding soil with the increase of burial time and covering depth under the leaching effect of rain water,and the migration amount are medium molecular weight substances<small molecular weight substances<high molecular weight substances.The influence of burial time on PAHs migration is better than the depth of soil.The maximum relative error between simulation results and actual results is 8.8%in buried 50 cm after 4 years of overburden,the results show that the reliability of dynamic eluviation simulator is higher.