Accelerated aerobic granulation using alternating feed loadings: Alginate-like exopolysaccharides
Journal
Bioresource Technology
Journal Volume
171
Pages
360-366
Date Issued
2014
Author(s)
Abstract
Alginate-like exopolysaccharides (ALE) likely contribute markedly to strength of aerobic granules. This study cultivated aerobic granules from propionate wastewaters using strategies with different organic loading rates (OLRs) (4.4-17.4kg/m3-d). When the OLR increased suddenly, the constituent cells (Pseudomonas, Clostridium, Thauera and Arthrobacter) were stimulated to secret extracellular cyclic diguanylate (c-di-GMP) and produced excess ALE, which formed a large quantity of sticky materials that served as the precursor of aerobic granules. Formation of excess ALE was the prerequisite for accelerated granulation. Conversely, this study observed no enrichment of poly guluronic acid blocks in ALE during granulation. ? 2014 Elsevier Ltd.
Subjects
Alginate-like exopolysaccharides
Alternating loading
C-di-GMP
Granulation
Type
journal article