Formation of bacterial aerobic granules: Role of propionate
Journal
Bioresource Technology
Journal Volume
197
Pages
489-494
Date Issued
2015
Author(s)
Abstract
Propionate presents as one of the major volatile fatty acids in municipal wastewaters, which are not readily degraded as acetate by microorganisms. This study cultivated aerobic granules from column reactors with acetate, acetate/propionate mix (3:1 and 1:3) and propionate as carbon sources and noted that propionate-rich feed would delay granulation, but could generate granules with high structural strength. Propionate feed enriched strains fractionated into the hydrophobic phase, Sphaerotilus sp., Sphingomonadaceae and Thauera sp., in granules and altered hydrophobicity of Thauera sp. and Zoogloea sp. The enriched strains could secret high quantities of cyclic-di-diguanylate to increase production of extracellular polymeric substances (EPS). The hydrophobic cell surface and increased EPS quantity led to integrated propionate-fed granules. Feed with high propionate concentration is proposed as promising way to cultivate strong aerobic granules for practical use. ? 2015 Elsevier Ltd.
Subjects
Aerobic granules
Exopolysaccharides
Hydrophilic
Hydrophobic
Propionate
Other Subjects
Carbon; Cell membranes; Fatty acids; Granular materials; Granulation; Hydrophobicity; Aerobic granules; Exopolysaccharides; Hydrophilic; Hydrophobic; Propionate; Volatile fatty acids; exopolysaccharide; polymer; propionic acid; acetic acid derivative; bis(3',5')-cyclic diguanylic acid; cyclic GMP; propionic acid derivative; waste water; acetate; bacterium; bioreactor; concentration (composition); exopolymer; fatty acid; hydrophobicity; polysaccharide; wastewater; Acinetobacter; Article; bacterial aerobic granule; bacterial phenomena and functions; carbon source; cell contact; cell surface; Flavobacterium; hydrophilicity; hydrophobicity; microbial community; nonhuman; priority journal; second messenger; sequencing batch reactor; sludge; Sphaerotilus; Sphingomonadaceae; Sphingomonas; Thauera; Zoogloea; aerobic metabolism; analogs and derivatives; bioreactor; chemical phenomena; chemistry; devices; metabolism; microbial consortium; microbiology; physiology; sewage; waste water; Bacteria (microorganisms); Sphaerotilus; Sphingomonadaceae; Thauera; Zoogloea sp.; Acetates; Aerobiosis; Bioreactors; Cyclic GMP; Hydrophobic and Hydrophilic Interactions; Microbial Consortia; Propionates; Thauera; Waste Disposal, Fluid; Waste Water
Type
journal article