Raw water clarification by flotation with microbubbles and nanobubbles generated with a multiphase pump

被引：26
作者：
Azevedo, A. [1 ]
Etchepare, R. [1 ]
Rubio, J. [1 ]
机构：
[1] Univ Fed Rio Grande do Sul, Minerals Engn Dept PPGE3M, Av Bento Goncalves 9500,Campus Vale,Predio 43819, BR-91501970 Porto Alegre, RS, Brazil
来源：
WATER SCIENCE AND TECHNOLOGY | 2017年 / 75卷 / 10期
关键词：
dissolved air flotation; drinking water; micro- and nanobubbles; multiphase pump; DISSOLVED-AIR FLOTATION;
D O I：
10.2166/wst.2017.113
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Raw water clarification by flotation was studied by injecting air into a centrifugal multiphase pump to generate microbubbles (MBs) and nanobubbles (NBs). Measurements of gas dispersion parameters were performed and optimal conditions were obtained using a pump pressure of 4 bar. Values showed a bubble Sauter diameter of 75 mu m, an air holdup of 1.2%, a bubble surface area flux of 34 s(-1) and an NB concentration of 1 x 10(8) NBs mL(-1) (measuring 220 nm). Then, a study compared flotation with bubbles formed with the multiphase pump (F-MP) to lamellar settling at the clarification stage of a water treatment plant (WTP), in Brazil. The F-MP showed a higher separation efficiency at high hydraulic loads (9-15 m h(-1)), even without the use of a polymer, reaching 2 NTU (10-25 NTU raw water feed), which was much lower than the technical goal of the WTP (5 NTU). The results and the technical aspects are discussed, and it is concluded that the employment of MBs and NBs with pumps widens
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收藏
页码：2342 / 2349
页数：8
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