| 摘要 |
The present invention relates to a method of cleaning an air diffuser apparatus in recovering filtrate of a solid-liquid mixing treatment liquid. The air diffuser apparatus (15) includes an air main pipe (18) that is connected to at least one aeration blower (B), liquid supply piping that joins in midstream of the air main pipe (18), a branch pipe conduit (25) that is horizontally connected through a gas supply pipe (16) branched from the air main pipe (18), and a plurality of air diffusion pipes (17) that are horizontally disposed perpendicular to the branch pipe conduit (25), each of the plurality of diffusion pipes having a plurality of diffusion holes that are opened substantially vertically downward. A gas flow rate in the branch pipe conduit is set to a range of 1 m/sec or more and 8 m/sec or less, and a liquid supply rate in the branch pipe conduit is set to a range of 0.03 L/min/mm 2 or more and 0.2 L/min/mm 2 or less. According to the configuration, solid sludge adhering to the diffusion holes of the air diffusion pipe (17) to close the diffusion holes is efficiently removed by a gas-liquid mixing fluid, so that the air diffusion pipe can be cleaned at any time without stopping a drainage treatment. |
