浮选捕收剂气浮浓缩城市污水处理厂剩余污泥的研究

Study on the thickening of wasted sludge from municipal wastewater treatment plant by air flotation

以浮选捕收剂SESN为表面活性剂,用气浮法对某大型城市污水处理厂的剩余活性污泥进行浓缩试验。结果表明,气浮时SESN的用量、pH值是影响污泥的水回收率及浓缩污泥的含水率的主要因素。当SESN用量为37.5mg/L时,气浮10min,水回收率为79.6%;浓缩污泥含水率从气浮前的99.44%降低到96.8%。用红外光谱及SEM对表面活性剂与污泥的作用机理进行研究,结果表明,表面活性剂SESN和污泥发生了化学吸附。

SESN was used as surfactant in the flotation thickening of waste activated sludge from municipal wastewater treatment plant. Experimental results indicate that pH value and the concentration of added surfactant and flocculation were important factors which affect the water recovery and the water content of thickened sludge. The water content of sludge was decreased from 99.44% to 96.8% in 10 minutes flotation thickening with the concentration of added SESN was 37.5mg/L. The water recovery of 79.6% was also achieved under that condition. In this study, the Spectroscopic Analysis and SEM were used to investigate the effects of surfactant on sludge surface and their function mechanism. The results show that the adsorption mechanism between SESN and sludge is chemisorption.