【摘要】 以A2/O系统的富磷剩余污泥为研究对象,考察了污泥浓缩过程中上清液各参数的变化特征,以及浓缩前、后污泥中阳离子及磷酸盐分布的变化。结果表明:随着重力浓缩的进行,污泥中的磷酸盐不断释放,到浓缩结束时释磷量可达5.51 mgP/g污泥,平均释磷速率为0.189 mgP/(g污泥.h);在释放的磷酸盐中,非磷灰石无机磷占60%左右,磷灰石无机磷约占40%,有机磷的释放量极为有限;在释磷过程中伴随着K+、Mg2+的释放;污泥浓缩前、后其性质并没有发生变化,聚磷菌仍然具有一定的好氧吸磷/厌氧释磷特性。更多还原

【Abstract】 Using phosphorus-rich sludge from A2/O system as the research object,the variation characteristics of supernatant parameters during sludge gravity thickening and the distribution of cations and phosphate in the sludge before and after thickening were investigated.The results indicate that phosphorus-rich sludge releases phosphate during gravity thickening,the phosphorus release amount is 5.51 mgP/g sludge at the end of thickening,and the average phosphorus release rate is 0.189 mgP/(g·h).In the whole phosphorus released,the non-apatite inorganic phosphorus accounts for 60%,the apatite inorganic phosphorus accounts for 40%,and the release amount of organic phosphorus is very limited.The release of phosphate is accompanied by the release of Mg2+ and K+.The characteristics of sludge do not change after gravity thickening,and phosphate accumulation organisms(PAOs) still release phosphorus under anaerobic condition and take up phosphorus under aerobic condition.更多还原