Histological Analysis of Microstructure of UASB Granules
Publication: Journal of Environmental Engineering
Volume 120, Issue 5
Abstract
A histological method was demonstrated for the microscopic analysis of granules from upflow‐anaerobic‐sludge‐blanket (UASB) reactors. Granules were first fixed with formaldehyde and embedded in paraffin, before being sectioned by a microtome to a thickness of 3–5 μm. The section was then mounted on a glass slide for microscopic examination using phase contrast and epi‐fluorescent excitation. Using this simple method, the microstructure of the granules and the distribution of methanogenic bacteria could be analyzed. Over 100 granules from UASB reactors treating sucrose wastewaters were examined. Microscopic photos showed that the granules had a surface layer comprised of hydrogen‐consuming methanogenic cocci and bacilli, and a loosely packed interior, mainly comprised of acetotrophic Methanothrix. This simple method provides engineers with a practical tool for studying the microstructure of the granules, the mechanisms of their formation, and kinetic modeling.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 120 • Issue 5 • September 1994
Pages: 1322 - 1326
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Oct 27, 1992
Published online: Sep 1, 1994
Published in print: Sep 1994
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