Two-phase anaerobic digestion of food waste: Effect of semi-continuous feeding on acidogenesis and methane production

Debkumar Chakraborty, Obulisamy Parthiba Karthikeyan, Ammaiyappan Selvam, Sankar Ganesh Palani, Makarand M. Ghangrekar, Jonathan W. C. Wong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In present investigation, effect of diverting acidogenic off-gas from leached bed reactor (LBR) to up-flow anaerobic sludge blanket (UASB) reactor during semi-continuous food waste (FW) anaerobic digestion was evaluated. In test LBR headspace pressure (3.3 psi) was maintained with intermittent headspace gas transfer into UASB. In control, same headspace pressure was maintained without gas transfer. The semi-continuous FW addition affected the characteristics and production of leachate in control and test LBR. The cumulative COD, total soluble products and methane yields were 1.26, 1.37 and 3 times higher in the test LBR than the control. The acetate and methane yields from test LBR were 697.8 g·kgVSadded−1 and 167.55 mL·gCOD−1feeding. Acidogenic gas transfer maintained low partial pressure of hydrogen and the hydrogen to carbon-di-oxide ratio in the headspace of LBR, which were thermodynamically favorable for microbial metabolism and concomitant high-rate production of acetate-rich volatile fatty acid and methane-rich biogas from FW.

Original languageEnglish
Article number126396
JournalBioresource Technology
Volume346
DOIs
Publication statusPublished - Feb 2022

Scopus Subject Areas

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

User-Defined Keywords

  • Anaerobic digestion
  • Food waste
  • Hydrogen partial pressure
  • Leached bed reactor
  • Semi-continuous operation
  • Two-stage digestion

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