| 摘要 |
<p>The invention relates to a process for the treatment of waste water with granular aerobic sludge, which waste water comprises organic matter and nutrients that have to be removed. According to the invention, the suspended material and sludge granules having poor settling ability are withdrawn from the reactor via a specifically chosen tap point. In this way a process is provided wherein the amount of suspended sludge in the effluent is drastically reduced, the selection for granular sludge is favoured, surplus sludge is withdrawn from the reactor, so that extensive post-treatment of the effluent becomes superfluous, resulting in considerable savings with regard to time and equipment . It is also proposed to periodically selectively withdraw the largest sludge granules in order to optimally control the size of the granules, to remove the sand fraction and to remove phosphate contained in the granules from the reactor.</p> |
