Effect of size variation on microbubble mass transfer coefficient in flotation and aeration processes.
Aeration
Chemical engineering
Environmental chemical engineering
Environmental science
Flotation
Green engineering
Mass transfer coefficient
Microbubble
Rising velocity
Water pollution
Water treatment
Journal
Heliyon
ISSN: 2405-8440
Titre abrégé: Heliyon
Pays: England
ID NLM: 101672560
Informations de publication
Date de publication:
Apr 2020
Apr 2020
Historique:
received:
04
02
2020
revised:
31
03
2020
accepted:
01
04
2020
entrez:
14
4
2020
pubmed:
14
4
2020
medline:
14
4
2020
Statut:
epublish
Résumé
Microbubble technology dramatically raises the efficiency of the flotation and aeration processes of water treatment plants (WTPs), which see extensive use in developed countries. A local institution, Indonesia Water Institute, has tried to investigate microbubble technology intended for lab-scale WTP. However, the current reactor system does not yet meet the microbubble criteria, especially as it has had few investigations of its abilities in flotation and aeration. This study aims to analyze the effect of size variations that affect the rising velocity and mass transfer coefficient (kLa) of aeration contact time. Three local spargers were used to produce microbubbles. Bubble diameters were measured optically and analyzed using ImageJ software. The dissolved oxygen (DO) concentration was measured every minute using an automated sensor so that the kLa could be determined. Of the three spargers, the smallest bubble size was produced by the vortex type with an average bubble diameter of 89 μm and the slowest rising velocity of 17.67 m/h. It also yielded the highest kLa of 0.297/min, which gave an aeration contact time of 3.64 minutes. The experimental uses of three local spargers revealed that the smaller the microbubble diameter, the higher the mass transfer coefficient in flotation and aeration processes. This research can be the basis for developing microbubble technology for WTP in Indonesia.
Identifiants
pubmed: 32280808
doi: 10.1016/j.heliyon.2020.e03748
pii: S2405-8440(20)30593-4
pii: e03748
pmc: PMC7138913
doi:
Types de publication
Journal Article
Langues
eng
Pagination
e03748Informations de copyright
© 2020 The Author(s).
Références
Biomed Res Int. 2016;2016:3572827
pubmed: 27034935
Appl Opt. 2016 Sep 10;55(26):7392
pubmed: 27661379
Proc Natl Acad Sci U S A. 1927 Sep;13(9):684-8
pubmed: 16587252
Water Sci Technol. 2017 May;75(10):2342-2349
pubmed: 28541942
Chemosphere. 2011 Aug;84(9):1175-80
pubmed: 21689840
Heliyon. 2017 Aug 07;3(8):e00376
pubmed: 28920086
Adv Colloid Interface Sci. 2017 Aug;246:40-51
pubmed: 28683861
J Colloid Interface Sci. 2009 Apr 1;332(1):208-14
pubmed: 19144348
Water Sci Technol. 2016;73(8):1969-77
pubmed: 27120652