NDLI: Effect of Expansion Ratio on Biofilm Performance in an Aerobic Fluidized Bed

Content Provider	IEEE Xplore Digital Library
Author	Dandan Zhou Shuangshi Dong Jingren Zhang Xiaotao Bi
Copyright Year	2010
Abstract	Biofilm performance at various bed expansion ratios was investigated in an aerobic biofilm fluidized bed. As the bed expansion was increased from 20 to 35%, bioparticle collision resulted in the decrease of biofilm thickness. However, shear stress became the dominant factor that resulted in the gradual decrease of biofilm thickness at high expansion ratios ranging from 65% to 90%. In general, biofilm thickness at the current study varied only slightly, remaining at a low level of 25±±5µm within the range of bed expansion from 20 to 90%, which is attributed to the characteristics of the spherical activated carbon particles. Moreover, there was no obvious change on the microbial count at low expansion ratios, with the bacteria count decreasing only gradually after the expansion ratio exceeded 65%. Although COD removal rate decreased slightly at high bed expansion ratio of 90%, up to 74% COD removal rate was still maintained at a short hydraulic retention time (HRT) of 45 min, which is attributed to a better nutrient mass transfer rate across the thin biofilm in the bioreactor. The axial biofilm thickness profile reflects a balance between the decreasing shear stress, and depleting nutrient concentration along the bed height along the height of the bed.
Starting Page	1
Ending Page	4
File Size	452976
Page Count	4
File Format	PDF
ISBN	9781424447121
ISSN	21517622
DOI	10.1109/ICBBE.2010.5517574
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pollution Microorganisms Bioreactors Chemical engineering Carbon dioxide Bismuth Educational institutions Fluidization Inductors Stress
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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