GROUNDWATER RECHARGE SYSTEM

PROBLEM TO BE SOLVED: To provide a groundwater recharge system, in which water flow efficiency in the recharge system is maintained and clogging of ground near a water injection well may be prevented.SOLUTION: A groundwater recharge system 11 comprises a closed drawn water well 1 for drawing groundwater W, a removal part 20 into which the groundwater W drawn from the drawn water well 1 is introduced and in which floating substance component and metal oxide contained in the groundwater W are removed, a reducing agent supplementation part 14 in which groundwater W filtrated at a filtration part 20 is supplied with reducing agent Re at a level where the oxidation-reduction potential of the groundwater W is reduced to a predetermined value or less, a water injection well 2 for injecting the groundwater W supplied with the reducing agent Re into the ground. The groundwater W drawn from the drawn water well 1 is led to the water injection well 2 via closed water pipes.SELECTED DRAWING: Figure 1 【課題】リチャージシステムの通水性能を保持し、注水井戸付近の地盤の目詰まりを防止することができる地下水リチャージシステムを提供する。【解決手段】地下水リチャージシステム１１は、地下水Ｗを揚水するための密閉された揚水井戸１と、揚水井戸１から揚水された地下水Ｗを導入し、地下水Ｗ中に存在する浮遊物質成分及び酸化金属を除去する除去部２０と、ろ過部２０でろ過された地下水Ｗに地下水Ｗの酸化還元電位が所定値以下になるまで還元剤Ｒｅを添加する還元剤添加部１４と、還元剤Ｒｅが添加された地下水Ｗを前記地盤内へ注水するための注水井戸２と、を備え、揚水井戸１から揚水された地下水Ｗを密閉された通水管を介して注水井戸２に導く。【選択図】図１