Dynamics of biofilm formation during anaerobic digestion of organic waste

Anaerobe
Susanne LangerMarian Kazda

Abstract

Biofilm-based reactors are effectively used for wastewater treatment but are not common in biogas production. This study investigated biofilm dynamics on biofilm carriers incubated in batch biogas reactors at high and low organic loading rates for sludge from meat industry dissolved air flotation units. Biofilm formation and dynamics were studied using various microscopic techniques. Resulting micrographs were analysed for total cell numbers, thickness of biofilms, biofilm-covered surface area, and the area covered by extracellular polymeric substances (EPS). Cell numbers within biofilms (10(11) cells ml(-1)) were up to one order of magnitude higher compared to the numbers of cells in the fluid reactor content. Further, biofilm formation and structure mainly correlated with the numbers of microorganisms present in the fluid reactor content and the organic loading. At high organic loading (45 kg VS m(-3)), the thickness of the continuous biofilm layer ranged from 5 to 160 μm with an average of 51 μm and a median of 26 μm. Conversely, at lower organic loading (15 kg VS m(-3)), only microcolonies were detectable. Those microcolonies increased in their frequency of occurrence during ongoing fermentation. Independently from the orga...Continue Reading

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Citations

Apr 4, 2016·Colloids and Surfaces. B, Biointerfaces·Vi NguyenCatherine A Biggs
Sep 19, 2015·Applied Microbiology and Biotechnology·Zhiji DingGiovanni Esposito
Jul 20, 2016·The Science of the Total Environment·C VoegelB Erable
Nov 4, 2016·BioMed Research International·Sharif AhmedMarian Kazda
Apr 18, 2019·Microbial Biotechnology·Susanne G LangerFrank R Bengelsdorf
Jun 7, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Marisol Vergara Mendoza, Rodrigo Torres Sáez
Feb 23, 2020·Bioresource Technology·Kerstin MaurusMarian Kazda

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