The culture of active sludge of secondary sedimentation tank of a s ew age treatment plant makes the amount of heterotroph in the sludge be reduced and the amount of nitrobacteria be increased and become the dominating one.

• 通过对某污水处理厂二沉池的活性污泥进行培养,使污泥中异养菌数量减少,硝化细菌数量增加,成为优势菌。