Review on Digestibility of Aerobic Granular Sludge

Mohamed S. Zaghloul, Asmaa M. Halbas, Rania A. Hamza, Elsayed Elbeshbishy

Research output: Contribution to journalReview articlepeer-review

4 Citations (Scopus)


Full-scale wastewater treatment plants utilizing aerobic granular sludge technology are being built in many countries worldwide. As with all biological wastewater treatment plants, the produced waste biomass must be stabilized to protect the population, wildlife, and the environment. Digestion is usually used to break down the complex organics in the waste sludge; however, the digestibility of aerobic granular sludge still needs to be fully understood compared to the conventional activated sludge. This paper reviews the studies published on the digestibility of waste aerobic granular sludge to date. Studies comparing aerobic granular sludge and activated sludge in terms of composition, properties, and digestibility are highlighted. The impact of biological composition and physical properties on the digestibility of sludge is reviewed in terms of biomethane production and biodegradability. The effect of pre-treatment is also covered. Areas for future research are presented.

Original languageEnglish
Article number326
Issue number2
Publication statusPublished - Feb 2023
Externally publishedYes


  • aerobic granular sludge
  • biomethane production
  • digestibility
  • pre-treatment
  • wastewater treatment

ASJC Scopus subject areas

  • Bioengineering
  • Chemical Engineering (miscellaneous)
  • Process Chemistry and Technology


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