Biooxidation is carried out by dispersed microbial flocs with relatively good settling properties and which can,in many respects,be regarded as pellets of naturally immobilized microbial cell.

• “可生物降解的污染物在曝气池中的生物氧化，澄清池中生物量和其他固体（污泥）的沉降，将澄清池浓缩的污泥循环进入曝气池以提高这一过程的强度。”