| 摘要 |
<p>The invention relates to a surface aeration treatment with recirculation of classified sludges, which is used for treating black waters, municipal waters or, in certain cases, wastewaters, comprising the following steps: screening the influent by means of a solids screen solely for the raw waters; recirculation pumping of waters with the lowest amount of dissolved oxygen from the biological oxidation tank to the surface aerator; injecting air by means of a blade fan with the purpose of maintaining high oxygen concentrations in the air inside the aerator; stirring by means of a mechanical stirrer which optionally provides for stirring, mixing and supplementary aeration; surface aeration by recirculating the mixed liquor and injecting air, which generates the liquid and gaseous interface that provoke oxygen transfer inside the aerator formed by the surface conduits; sedimentation with sludge classification with the purpose of not using sludges whose qualitative characteristics have been activated discretely; in this step, the sludges are classified into heavy, intermediate and light sludges with the purpose of recirculating the light sludges and recirculating or removing the heavy sludges whenever there are excessive sludges. The treatment can use the potential energy that is wasted in rapid black water courses with differences in level between 5 and 30 m, thereby enabling considerable energy savings by reducing the energy required for repumping and stirring.</p> |
