The present invention sequentially adds a membrane filter, a screen filter, a carbon filter, an ultraviolet sterilization lamp, and a treatment tank equipped with a screw-type nanobubble generator and an impeller-type nanobubble generator to a water collecting tank into which treated water flows through the village sewage treatment facility. This expands the range of nanobubbles to the entire treatment tank and improves water quality for suspended solids (SS), dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), and coliform bacteria. It is intended to improve. In addition, by using the present invention in small rural areas to prevent water pollution of the small rivers, recycling the treated water through the village sewage treatment facilities to supplement the insufficient water resources, prevent the drying of the stream, as well as the agricultural land fertilizer It is intended to be supplied as a component.
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