| 摘要 |
PROBLEM TO BE SOLVED: To provide a piping system capable of inexpensively and efficiently executing, inside piping, a degradative treatment of a treatment object in fluid flowing inside the piping such as underground piping.SOLUTION: A piping system comprises: an underground buried pipe conduit 2 which has a photocatalytic layer along an internal wall surface thereof; a light guiding pipe conduit 3a which is connected to the underground buried pipe conduit 2 at one end in a manner that diverges therefrom and enables sunlight to enter through the other end so that the entered sunlight is brought to the photocatalytic layer in the underground buried pipe conduit 2 by reflecting the sunlight on a mirror surface provided on the internal wall surface of the light guiding pipe conduit 3a; and a light condensing device 4a which is arranged at a light introducing port side of the light guiding pipe conduit 3a to let in the sunlight and condenses the same in the light guiding pipe conduit 3a. |
