(北京科技大学 土木与环境工程学院，北京，100083)
摘 要: 研究添加捕收剂对城市污水处理过程产生的剩余污泥气浮浓缩的影响，包括捕收剂的种类和用量、与聚丙烯酰胺的配合使用以及pH值等因素。结果表明：对城市污水处理产生的剩余活性污泥，添加捕收剂后能大幅缩短污泥浓缩时间，同时降低浓缩污泥的含水率，提高浓缩效果；捕收剂SESN用量为37.5 mg/L，气浮5 min时，污泥的含水率从平均99.44%降至96.8%；捕收剂SEAN的用量为18.75 mg/L，气浮5 min可使污泥含水率从99.44%降至96.4%，体积为浓缩前的1/5；而同样的污泥用重力浓缩1 h含水率仅能降到98%左右；捕收剂与聚丙烯酰胺(PAM)配合使用可以提高气浮速度和出水水质。
关键字: 捕收剂；剩余污泥；气浮浓缩
activated sludge from sewage treatment plant
（School of Civil and Environmental Engineering, University of Science and Technology Beijing,
Beijing 100083, China）
Abstract: Several factors that influence the performance of air flotation thickening of waste activated sludge from sewage treatment plant were investigated. These factors include types and dosage of collecting reagents, pH value and concentration of polyacrylamide (PAM) used as flocculants. The results show that adding collectors can greatly decrease the air flotation time, reduce the moisture content of the thickened sludge and improve the thickening performance. Using the laboratory batch tester, when the dosage of collector (SESN) is 37.5 mg/L and the air floatation time is 5 min, the solids content of thickened activated sludge increases from 0.56% to 4.2%. When the dosage of SESN is 18.75 mg/L, the solids content of sludge increases from 0.56% to 3.6%, which means the volume of the sludge after thickening reduces to 1/5 of that of the original volume. In comparison, the solids content of sludge thickened by gravity sedimentation is only approximately 2%. Adding PAM along with collector can accelerate the air flotation speed and achieve better effluent quality.
Key words: flotation collector; waste activated sludge; air flotation thickening
