Pretreatment of milled and unchopped sugarcane bagasse with vortex based hydrodynamic cavitation for enhanced biogas production

Sanjay Nagarajan, Vivek V. Ranade*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Anaerobic digestion can potentially valorise sugarcane bagasse to biogas and fertiliser. Pretreatment is however required to overcome recalcitrance and enhance the biogas yields. Literature reporting the investigation of various biomass pretreatments often use milled biomass as substrate rather than as-received fibrous biomass. This does not establish the true influence of the pretreatment type on biogas generation. Additionally, milling energy is also ignored when calculating net energy gains from enhanced biogas yields and are thus misleading. In this work, a vortex-based hydrodynamic cavitation device was used to enhance the biomethane yields from fibrous as-received biomass for the first time. Clear justification on why milled biomass must not be used as substrates for demonstrating the effect of pretreatment on biogas production is also discussed. The net energy gain from milled hydrodynamic cavitation pre-treated bagasse can be similar to as-received bagasse only when the specific milling energy is ≤700 kWh/ton.

Original languageEnglish
Article number127663
Number of pages8
JournalBioresource Technology
Volume361
Early online date21 Jul 2022
DOIs
Publication statusPublished - 1 Oct 2022

Keywords

  • Biogas
  • Fibrous biomass
  • Hydrodynamic cavitation
  • Net positive energy gain

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