Improving aeration systems in saline water: measurement of local bubble size and volumetric mass transfer coefficient of conventional membrane diffusers | Zendy

Justus Behnisch | Zendy; Anja Ganzauge | Zendy; S. Sander | Zendy; Maria P. Herrling | Zendy; Martin Wagner | Zendy

Open Access

Improving aeration systems in saline water: measurement of local bubble size and volumetric mass transfer coefficient of conventional membrane diffusers

Author(s) -

Justus Behnisch,

Anja Ganzauge,

S. Sander,

Maria P. Herrling,

Martin Wagner

Publication year - 2018

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2018.358

Subject(s) - bubble , aeration , coalescence (physics) , mass transfer , mass transfer coefficient , chemistry , tap water , mechanics , brine , merge (version control) , membrane , analytical chemistry (journal) , materials science , chromatography , environmental engineering , physics , environmental science , biochemistry , organic chemistry , astrobiology , computer science , information retrieval

In this study, for the first time, the influence of the design of conventional membrane diffusers on the volumetric mass transfer coefficient (k L a) and bubble size in tap water (TW) and saline water (SW) was investigated (up to 15 g/L NaCl). By using a new analytical approach, k L a and the bubble size along the ascent of the bubble swarm were measured simultaneously and in real time. The results show that in TW, after collision bubbles merge into larger bubbles by coalescence. In SW, coalescence is inhibited by salt. Due to the smaller bubble size, k L a increases to more than double compared to TW. The results show that in SW, membrane diffusers with dense slit patterns and smaller slit lengths are to be recommended in order to enable improved utilization of oxygen in saline water.

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