| 摘要 |
<p>A method and apparatus suitable for sweetening sewerage which avoids the need for pumping the sewerage. The method comprises the steps of passing the sewerage under a gas tight hood (4) and causing it to fall as a stream through a first passageway (14), passing bubbles of a sweetening gas, such as oxygen, up through the descending sewerage to dissolve in the liquid stream to form a gas-liquid stream and causing the gas-liquid stream to ascend through a second passageway (16) in which further bubbles of sweetening gas are passed therethrough to dissolve further gas in the stream to balance the liquid density in the descending and ascending streams. <IMAGE></p> |
