In-situ biogas upgrading by bio-methanation with an innovative membrane bioreactor combining sludge filtration and H2 injection

Bioresour Technol. 2021 Oct:337:125444. doi: 10.1016/j.biortech.2021.125444. Epub 2021 Jun 21.

Abstract

A bioreactor using membrane technologies was used to demonstrate the feasibility of in-situ bio-methanation coupled to industrial wastewater treatment for biogas upgrading. High biogas productivity (1.7 Nm3Biogas/m3Bioreactor/day) with high CH4 content (97.9%) was reached. In-situ bio-methanation did not affect the COD removal efficiency of anerobic digestion (>94%). Process resilience has been tested for both substrate overload and H2 intermittence injection. Recovery of high CH4 content after 7 days without H2 injection occurred within few hours. Influence of microbial community has been studied showing that both hydrogenotrophic and homoacetogenic-acetoclastic pathways were involved.

Keywords: Biogas up-grading; In-situ bio-methanation; Membrane bioreactor; Power-to-gas.

MeSH terms

  • Biofuels*
  • Bioreactors
  • Hydrogen
  • Methane
  • Sewage*

Substances

  • Biofuels
  • Sewage
  • Hydrogen
  • Methane