泥龄对生物除磷效率影响的分析

Analysis of Effect of SRT on Biological Phosphorus Removal

文章采用Ｌａｗｒｅｎｃｅ－ＭｃＣａｒｔｙ模式，分析了泥龄对生物除磷效率的影响。分析结果表明当泥龄由２０天缩短为５天时，系统的剩余污泥排放量增加近一倍，同化脱磷效率可由１５．７％增加至３０．７％；短泥龄系统对ＴＢＯＤ／ＴＰ值的敏感性强于长泥龄系统；若期望从废水中去除的磷量不变，则要求剩余污泥含磷量，即污泥的聚磷能力随泥龄的增加而增加。笔者认为，深入研究短泥龄系统的运行，对提高生物除磷的效率具有重要意义。

In this paper, the effect of solids-retention time (SRT) on effect of biological phosphorus removal from wastewater is analyzed based on a steady-state kinetic model. It is indicated that short SRT can increase phosphorus removal by anabolism pathway due to the increase of surplus sludge discharge. If the same amount of phosphorus removal is expected, the content of poly- phosphate in surplus sludge should be higher in long STR than that in short SRT. This, in turn, implies a better capacity of accumulating phosphate is required for sludge with long STR. Because there are no sufficient evidences supporting this conclusion, it is considered that the investigation on application of short STR is encouraged for biological enhanced phosphorus removal processes.