| 摘要 |
<p>Appts. for the biological treatment of effluent, i.e., activated sludge treatment, in which a vertical spiral guide wall with constant spacing between adjacent turns is provided in the aeration tank forming a spiral channel through which the effluent/activated sludge mixture to be aerated is force circulated, pref. in such a way that it is fed to the centre and discharged at the end of the spiral.</p> |
