(北京科技大學(xué) 土木與環(huán)境工程學(xué)院，北京，100083)
摘 要: 研究添加捕收劑對城市污水處理過程產(chǎn)生的剩余污泥氣浮濃縮的影響，包括捕收劑的種類和用量、與聚丙烯酰胺的配合使用以及pH值等因素。結(jié)果表明：對城市污水處理產(chǎn)生的剩余活性污泥，添加捕收劑后能大幅縮短污泥濃縮時(shí)間，同時(shí)降低濃縮污泥的含水率，提高濃縮效果；捕收劑SESN用量為37.5 mg/L，氣浮5 min時(shí)，污泥的含水率從平均99.44%降至96.8%；捕收劑SEAN的用量為18.75 mg/L，氣浮5 min可使污泥含水率從99.44%降至96.4%，體積為濃縮前的1/5；而同樣的污泥用重力濃縮1 h含水率僅能降到98%左右；捕收劑與聚丙烯酰胺(PAM)配合使用可以提高氣浮速度和出水水質(zhì)。
關(guān)鍵字: 捕收劑；剩余污泥；氣浮濃縮
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
