Greenhouse gas emissions in sludge ultrasonication followed by anaerobic digestion processes

Pilli Sridhar, R. D. Tyagi, Puspendu Bhunia, Prangya Ranjan Rout, Tian C. Zhang, Rao Y. Surampalli

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


This paper presents the greenhouse gas (GHG) emissions during ultrasonication of sludge and anaerobic digestion (AD) of the ultrasonicated sludge using mass-energy balance. Computation of the net energy (energy recovered - energy input) revealed that high solids concentration with low sonication specific energy provides positive net energy. Moreover, the GHG emissions can be minimised at low sonication specific energy input and high solids concentration compared to that of the control without sonication. Increase in temperature of sludge during sonication will reduce the energy input required for raising the sludge temperature to AD temperature and thus decreases the GHG emissions. With energy recovery from the methane produced in AD, the total GHG emissions can further be reduced, lower than that without energy recovery from methane.

Original languageEnglish (US)
Article number125754
JournalBioresource Technology
StatePublished - Dec 2021


  • Anaerobic digestion
  • Greenhouse gas (GHG) emissions
  • Mass-energy balance
  • Methane recovery
  • Ultrasonication

ASJC Scopus subject areas

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


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