WATER TREATMENT INSTALLATION

PROBLEM TO BE SOLVED: To provide a water treatment installation in which maintenance is facilitated.SOLUTION: A water treatment installation comprises: a filtration layer for filtering raw water in an upward counter flow; and an air diffusion device 100b for supplying air for generating air bubbles on a lower side of the filtration layer, and floating the air bubbles through the filtration layer, thereby purifying the filtration layer. The air diffusion device 100b comprises: a main pipe 3a for air feeding, disposed on a lower side of the filtration layer; and plural branch pipes 4 branched from the main pipe 3a for air feeding. The branch pipes 4 comprise respectively, a connection part 4a connected to the main pipe 3a for air feeding, and an opening 4b for releasing air which is introduced from the main pipe 3a for air feeding through the connection part 4a, for generating air bubbles on a lower side of the filtration layer. The branch pipes 4 have a turn part 4c where a distribution direction of the air is turned from downward to upward, in a range between the connection part 4a and the opening 4b, and on at least the turn part 4c, the branch pipes can be separated into one and the other parts which can be detachably coupled.SELECTED DRAWING: Figure 5 【課題】メンテナンスが容易な水処理設備の提供。【解決手段】原水を上向流で濾過する濾層と、気体を供給して前記濾層の下方に気泡を発生させ、該気泡を前記濾層を通じて浮上させることによって前記濾層を浄化する散気装置１００ｂとを備え、散気装置１００ｂは、濾層よりも下方に配された給気用本管３ａと、給気用本管３ａから分岐した複数の分岐管４とを有し、分岐管４は、給気用本管３ａに接続された接続部４ａと、前記濾層の下方に気泡を発生させるべく接続部４ａを通じて給気用本管３ａから導入された気体を放出する開口部４ｂとを備え、且つ、分岐管４は、接続部４ａから開口部４ｂまでの間に気体の流通方向が下向きから上向きへとターンするターン部４ｃを有し、少なくともターン部４ｃにおいて互いに着脱自在な一方と他方とに分割可能である。【選択図】図５