在反应池的上壁和上流式澄清池中堰上的一些地方，藻类生长导致发现，植物中正在发生生物硝化作用，这对水质产生了有益的影响。作者认为，如果处理过程利用这一现象，可以以更低的成本获得更好的水质。包括7个参考文献、表格、图表。

Algal growth on the upper walls of a reaction basin and in a few places on weirs in an upflow clarifier led to the discovery that biological nitrification was taking place in the plant, which was having a beneficial effect on water quality. The authors believe that if treatment processes take advantage of this phenomenon, better quality water could be achieved, possibly at a lower cost. Includes 7 references, table, figures.