河道再生水入渗的水岩相互作用机理研究

摘要

依托引温济潮工程受水区,通过室内淋溶试验,研究再生水经过河床底部介质过程中阳离子的交换吸附机理以及河床底部介质对TN和NO3--N的去除效果.根据受水河道周边的地下水水质监测数据,验证了再生水与河床底部介质的水岩相互作用机理.结果表明:再生水资源利用9年以来,地下水中盐度增加;尽管再生水入渗引起了水中K+与河道底部介质中Ca2+之间的交换吸附,但仍然对地下水总硬度具有稀释作用,导致总硬度降低;河道底部介质对再生水中的NO3--N具有显著的去除效果,使得地下水中NO3--N浓度很低.对于无机组分而言,再生水资源利用对地下水水质基本没有负面影响.%Based on the water diversion project from Wenyu River to Chaobai River , the leaching experiment was carried out to study the cation exchange adsorption mechanism and TN and NO 3--N removal effect of riverbed medium in the process of the reclaimed water passing through riverbed .According to the groundwater quality monitoring data , the interaction mechanism of water and rocks between the reclaimed water and riverbed medium was verified .The results show that the salinity in groundwater increases for nine years of using the reclaimed water . Though the infiltration of reclaimed water causes the exchange between K +in water and Ca2+in soil, the total hardness of groundwater decreases .The concentration of NO 3--N is very low in groundwater due to the significant removal effect of riverbed medium .For inorganic components , the reclaimed water has no negative effect .