| 摘要 |
<p>An apparatus for use in an activated sludge process for treating wastewater wherein raw sewage or the like is mixed with activated sludge and the resulting mixture is circulated in a confined aerated tank (usually in the form of additional subsurface aeration) so that the mixture follows a predetermined vertical flow cycle through a plurality of flow passageways created by gas impermeable baffle means in order to optimally increase the retention time of aerating air in the tank. The retention time of the air is increased by means of at least one secondary horizontal baffle means specifically designed to collect large bubbles of air trapped beneath said gas-impermeable baffle means and to be permeable to gases, so as to provide additional air/liquid surface area to escaping air. The secondary baffle is situated adjacently above and substantially parallel to the gas impermeable flow directing baffle means.</p> |
