| 摘要 |
<p>The invention is directed to a process for the aerobic purification of waste water in a reactor containing unsupported granular active sludge. In the figure there is a reactor (1) having two compartments, (2 and 3). At the bottom of compartment (2) air is introduced through (4). The mixture of gas, sludge and waste water has an upward flow in compartment (2) due to the airlift action of the air introduced in the bottom. The mixture of gas, sludge and waste water flows over the upper rim of the separation wall (5) between the two compartments (2 and 3). In the alternative it may flow through suitable openings provided in the wall (5) at a level below the water level in both compartments. In compartment (3) a three phase settler (6) has been provided, which settler separates gas, sludge and water. Part of the water, which is substantially free from suspended sludge is removed from the ractor (1) as effluent. The sludge is removed from settler (6) and is returned to the reactor, in compartment (3). The sludge and the waste water have a downward flow in this compartment (3). In this compartment the waste water is introduced through line (8). The resulting mixture flows to compartment (2) underneath the separation wall (5). It is to be remarked that alternatively the waste water may be introduced in compartment (2). <IMAGE></p> |
