低浓度LAS对活性污泥性质和去除污染物行为的影响

采用SBR处理模拟废水,考察了不同浓度阴离子表面活性剂——烷基苯磺酸钠（LAS）对反应器活性污泥的影响。实验结果表明,低浓度表面活性剂LAS的投加,有利于提高SBR中活性污泥对COD和氨氮处理效率,并且活性污泥的沉降性以及微生物活性也随着LAS投加浓度的升高而升高。但是,当LAS的投加浓度过高时（1 mg/L）,污泥表面产生起泡、乳化和微粒悬浮等现象,使大量固体陷入漂浮泡沫层,降低曝气池的充氧效率,最终导致污泥解体,沉降性变差,活性下降。

Effect of low concentration of anionic surfactant LAS on activated sludge performance and pollutants removal behavior

We examined the effect of different concentrations of LAS on activated sludge performance.Experiments were conducted with the synthetic wastewater in four lab-scale sequencing batch reactors（SBRs）.The results showed that lower concentration of LAS addition improved the removal efficiencies of COD and ammonium,and increased the sludge performance of settling property,flocculation and microbial activity with increasing concentration of LAS.However,high level of LAS（1 mg / L） led to sludge surface produce foaming,emulsify and particles suspend.A lot of solid sink into the floating foam layer,reduced the oxygen filling efficiency of aeration pool and caused the sludge disintegration,resulting in bad settleability and lower microbial activity.