Pre-acidification greatly improved granules physicochemical properties and operational stability of Upflow anaerobic sludge Blanket (UASB) reactor treating low-strength starch wastewater

Jiang Wu, Bo Jiang, Bo Feng, Lu Li, Siti Nur Fatihah Moideen, Hong Chen, Chaimaa Mribet, Yu You Li

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A two-stage process consisting of a pre-acidification unit and an Upflow Anaerobic Sludge Blanket (UASB) reactor (UASBT-S) was compared with a one-stage UASB reactor (UASBO-S) to evaluate the treatment stability of starch wastewater (SW). The Two-stage process provided higher treatment stability than UASBO-S. Sludge floatation occurred in the UASBO-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 UASBT-S, which greatly improved settling capability and strength of the granular sludge.

Original languageEnglish
Article number122810
JournalBioresource Technology
Volume302
DOIs
Publication statusPublished - 2020 Apr

Keywords

  • Bound EPS
  • Granular sludge floatation
  • Pre-acidification
  • Starch wastewater
  • UASB reactor

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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