人工回灌条件下的水岩作用室内实验研究

摘要

人工回灌过程中所发生的水岩作用是影响含水层地下水环境质量的重要因素。本次采用室内实验技术对人工回灌过程中的水文地球化学作用和各主要离子的来源进行了分析。结果表明：人工回灌过程中地下水中的Na＋不仅受混合作用的影响,还伴随有相应的阳离子交换反应和含Na矿物的溶解反应等,而且回灌过程对原始地下水中的Na＋、Cl-有稀释作用;K＋主要受到钾长石矿物溶解的影响;人工回灌过程中存在石膏、方解石等矿物组分溶解,并且介质中的含锰矿物和含铁矿物发生了溶解反应。%Hydrogeochemical changes during artificial recharge are an important factor influencing the quality of groundwater in a recharged aquifer.A laboratory experiment was used to study hydrogeochemical changes,and the origins of major ions,during artificial recharge.The results of the research showed that Na＋ in the groundwater was affected by mixing,cation exchange reactions,and dissolution of sodium-bearing minerals;Na＋ and Cl– were diluted during the artificial recharge;K＋ was affected by the dissolution of potash feldspar.The dissolution of gypsum,calcite,iron-bearing,and manganese-bearing minerals also occurred during the artificial recharge.