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Effects of bubble size on air-scoured backwashing efficiency in a biofilter

Authors
Park, No SukYoon, Suk MiminKim, Su HanKim, Jong Oh
Issue Date
Apr-2016
Publisher
DESALINATION PUBL
Keywords
Backwashing; Air-scoured; Biofilter; Biomass; Bubble size
Citation
DESALINATION AND WATER TREATMENT, v.57, no.16, pp.7538 - 7544
Indexed
SCIE
SCOPUS
Journal Title
DESALINATION AND WATER TREATMENT
Volume
57
Number
16
Start Page
7538
End Page
7544
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5079
DOI
10.1080/19443994.2015.1024936
ISSN
1944-3994
Abstract
The effect of bubble size on air-scoured backwashing efficiency in a biofilter was investigated using experiments and simple mathematical models based on collapse-pulsing theory. Four types of backwashing experiments were conducted: water alone, water and large bubbles (diameter = about 1 cm), water and small bubbles (diameter = about 0.2 cm), and water containing dissolved air. The third type, water and small bubbles, was found to be the most efficient. Modeling results confirmed the experimental results, indicating that even when the same volume of air was used, smaller bubbles generate higher shear stress on the surface of the medium, resulting in more efficient removal of biomass. In the case of dissolved air, however, micro-bubbles (diameter = 10-100 mu m) are too small and rise too slowly to produce a strong-enough collapse-pulsing effect. This produces less shear stress and ultimately results in poor backwashing efficiency.
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서울 공과대학 > 서울 건설환경공학과 > 1. Journal Articles

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Kim, Jong Oh
COLLEGE OF ENGINEERING (DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING)
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