| 摘要 |
PROBLEM TO BE SOLVED: To provide a spray pipe that sprays water uniformly on a trickle bed in a trickle bed apparatus.SOLUTION: A spray pipe 11 includes a main pipe 111 having a tubular portion, and a plurality of branch pipes 112 that communicate with the main pipe 111 and are located side by side along a longitudinal direction of the main pipe 111 on a tubular curved face of the main pipe 111, wherein a pipe diameter ratio D/Dof a pipe diameter Dof the branch pipes 112 to a pipe diameter Dof the main pipe 111 is greater than 0.2 and less than 0.8, and each of the plurality of branch pipes 112 is disposed according to an outflow flow rate ratio Q/Qdetermined depending on an order of location of the branch pipes 112 along the longitudinal direction of the main pipe 111 from an upstream side to a downstream side when water to be treated W2 flows into the main pipe 111 in a predetermined flow velocity range or in a predetermined inflow rate range, and according to an area of a circular or hollow circular region allotted to each of the branch pipes 112. |
