It is possible to keep a higher concentration of readily biodegradable COD in anaerobic stripper because P release is carried out in a concentrated form, in the small sidestream, when the lipuor is added into the stripper. 由于磷的释放是以浓缩形式,只是在回流污泥这股小的侧流中进行的,所以当加入这些发酵液后,在厌氧放磷区保持较高的生物易降解COD浓度是可能的。