Journal
BIORESOURCE TECHNOLOGY
Volume 302, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.122810
Keywords
Starch wastewater; UASB reactor; Pre-acidification; Bound EPS; Granular sludge floatation
Funding
- Japan Society for the Promotion of Science (JSPS) [J00995]
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A two-stage process consisting of a pre-acidification unit and an Upflow Anaerobic Sludge Blanket (UASB) reactor (UASB(T-S)) was compared with a one-stage UASB reactor (UASB(O-S)) to evaluate the treatment stability of starch wastewater (SW). The Two-stage process provided higher treatment stability than UASB(O-S). Sludge floatation occurred in the UASB(O-S) when the organic loading rate (OLR) was increased to 4 g-COD/L/d, beyond which a paste-like membrane structure adhered to the granules was observed. Further analysis suggests that the substrate derived polysaccharide components embedded in the loosely-bound extracellular polymeric substances (LB-EPS), triggered significant increase in the protein/polysaccharide ratio in the tightly-bound EPS (TB-EPS), and was suggested to result in the granules floatation and disintegration. During the pre-acidification, the starch was mainly converted to acetic and propionic acids. The pre-acidification was beneficial for reducing the EPS content fluctuations in the UASB(T-S), which greatly improved settling capability and strength of the granular sludge.
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