污泥气浮浓缩过程中捕收剂的影响-中国有色金属学报.PDFVIP

第 17 卷第 9 期 中国有色金属学报 2007 年 9 月 Vol.17 No.9 The Chinese Journal of Nonferrous Metals Sep. 2007 文章编号：1004-0609(2007)09-1550-05 污泥气浮浓缩过程中捕收剂的影响 崔志广，孙体昌，寇 珏，孙卫娟 (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。 关键词：捕收剂；剩余污泥；气浮浓缩 中图分类号：X 703.1 文献标识码：A Effect of collector on thickening of waste activated sludge from sewage treatment plant CUI Zhi-guang, SUN Ti-chang, KOU Jue, SUN Wei-juan (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 fr