Anaerobic digestion of waste activated sludge using dynamic membrane at varying substrate concentration reveals new insight towards methanogenic pathway and biofilm formation

Roent Dune A. Cayetano, Gi Beom Kim, Jong Hun Park, Min Jae Lee, Sang Hyoun Kim

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Biomass retention through the dynamic membrane (DM) proved beneficial to the stable performance of AnDMBR treating waste activated sludge without prior pretreatment. The highest average methane production rate of 1.04 L-CH4/L/d was achieved at a feed concentration of 100 g-COD/L and an organic loading rate of 6.25 g-COD/L-d. Increasing substrate concentration resulted in archaeal population shift from a mixed acetate/H2 utilizing methanogens (Methanosarcinales) to strict H2 utilizing methanogens (Methanobacteriales). Predicted functional gene analysis also confirmed hydrogenotrophic encoding genes became dominant in methanogenic pathways at higher feed concentration. The occurrence of glycosyltransferase encoding genes has substantiated the role of EPS towards DM layer (biofilm) formation which could retain essential microorganisms and achieve steady sludge treatment performance at the high organic loading rate. Moreover, increase in average particle size distribution may suggest the presence of microbial aggregates which also helped in establishing the DM layer. This study shows a promising potential of high-rate treatment of WAS using an AnDMBR system and provides new insights regarding biofilm (DM layer) development.

Original languageEnglish
Article number130249
JournalChemical Engineering Journal
Volume423
DOIs
Publication statusPublished - 2021 Nov 1

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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