| 摘要 |
<p>In the biological purification of a liquid, a batch of the liquid is contacted in a treatment space with micro-organisms present in that space from a preceding treatment. During or after supply of the liquid, oxygen is supplied to the treatment space until the desired degree of purification has been reached, after which the liquid becomes quiescent and the substances suspended in the liquid can sedimentate. The clarified liquid present above the sediment is drawn off, and the slit remaining in the treatment space and containing micro-organisms is stored therein under such conditions that their activity remains conserved to a sufficient degree until the supply of the next liquid batch. The amount of the stored silt is varied according to what is needed for treating the next batch, the surplus silt being removed.</p> |
