Basic Study of Artificial Recharge by Multi well Method

研究的主要目的是通过对比1)充水井性能的变化，2)含水层中微生物的活动，3)极地芬兰和日本温带地区含水层的净化能力，来检验大规模蓄热方法对自然界的一些不良现象。自1972年以来，拉彭兰塔一直采用地下水补给方法直接供应自来水。在拉贾马基，地下水从1974年开始以人工补给的方式循环使用，作为蒸馏的冷却剂。自1985年起，自来水采用人工回灌法作为预净水方法。另一方面，山形大学的太阳含水层从1982年开始进行季节性蓄热实验。通过对两国的数据进行比较，得到了以下结果。1.在芬兰，他们自豪地经历了25年以上的漫长经历，没有发生水质变化、微生物增加、充油井堵塞等问题，这些问题都是由含水层储能方法引起的。由于铁细菌和藻类的复合活性，人工回灌池塘的净化效果有所提高。在装料井周围形成铁胶体坝，提高了热回收系数，同时也起到了净化装料水的作用。

The main purpose of the research is the checking of some undesirable phenomena for the nature induced by the large scale heat storage method by means of the comparison 1) the change of the performance of the charge well, 2) activity of the microorganism in the aquifer, 3) ability of purification in aquifer between Finland in polar region and Japan in temperate zone.In Lappenranta, tap water has been supplied diretly by the groundwater recharge method since 1972. In Rajamaki, the groundwater has been used in cyclic by the method of artificial recharge as coolant of the distilllation from 1974. From 1985, artificial recharge method has been adopted as the pre-purification method for tap water. On the other hand, Solar Aquifer in Yamagata university has been running the experiments of seasonal heat storage from 1982.From the comparison the data obtained in the two countries, following results were obtained. 1. In Finland where they are proud of the long experiences more than 25 years, there have no problems occurred such as change of the water quality, increase of microorganisms and clogging of the charge well, originated by the aqifer thermal energy storage method.2. Purification performande in the artificial recharge pond increased due to the compound activities of iron bacteria and algae.3. Ferric colloid dam formed around the charge well increase the heat recovery factor, in additon to the work of the purification of the charge water.