| 摘要 |
<p>A method and apparatus for the treatment of wastewater in which the wastewater is circulated around a system comprising a downcomer (1) and a riser (2) communicating with each other at their lower ends, the level of the wastewater in the downcomer being maintained above the level of the wastewater in the riser and providing a hydrostatic pressure head which causes circulation of the wastewater around the system at a pre-selected rate, a gas containing free oxygen is supplied to the wastewater as it passes through the downcomer, and the wastewater is pumped from, orfrom near, the top of the riser back into the downcomer (or vessel communicating therewith) at a position(s) (9,10) above the highest level (B,B') to which the wastewater in the downcomer can fluctuate during normal operation of the system when operating at maximum load.</p> |
