A housing frame includes a recess, a flat seat portion and a frame-shaped seat portion which are positioning units for a spot-like light source, a light conductive bar and a light conductive plate, respectively. The clapping plate preferably having a recessed area with air holes placed though the clapping plate enabling air to fill the void created when two contacting clapping plates are rapidly pulled away from one another. The second event pipeline has an ability to detect one or more faults occurring therein. Additionally, the second aerobic artificial wetland induces a vertical flow of treated water which is introduced from the anaerobic artificial wetland, and allows air to be supplied inwardly such that the amount of dissolved oxygen of the introduced treated water increases.