| 摘要 |
<p>The plant is a tank (10) forming an aeration chamber in which waste water is treated with active sludge and is aerated, and which has mounted therein a plate insert (24) defining an upwardly open secondary sedimentation chamber having inclined side walls and an overflow for purified waste water (40) as well as a bottom opening (25) through which precipitated sludge flows back to the aeration chamber. Two vertical plates (31) define a central channel in the plate insert, said channel being in communication with the aeration chamber through tubes (32) and causing auxiliary currents to be generated in the tubes and the lower portion of the plate insert, said currents contributing towards keeping the bottom opening free from accumulations of sludge.</p> |
