Anatomy of super-fast activated sludge process with gravity settling for biodegradation and energy recovery potential - a review

Orhon D., Sözen S., Ubay Cokgor E., Janssen P.

JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, vol.97, no.5, pp.1086-1098, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Review
  • Volume: 97 Issue: 5
  • Publication Date: 2022
  • Doi Number: 10.1002/jctb.7012
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Agricultural & Environmental Science Database, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, EMBASE, Food Science & Technology Abstracts, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Page Numbers: pp.1086-1098
  • Keywords: activated sludge, modified aeration, the A process, biodegradation, energy recovery, modelling, RATE CONTACT-STABILIZATION, WASTE-WATER TREATMENT, NITROGEN REMOVAL, COD FRACTIONATION, NUTRIENT REMOVAL, RETENTION TIMES, MODEL, MANAGEMENT, DESIGN, CARBON
  • Istanbul Technical University Affiliated: Yes


This study reviewed the conceptual basis and the application of extremely high rate activated sludge configurations with gravity settling. It evaluated the modified aeration process, as the historical pioneering development, and the A process (adsorption), which was inspired by the traditional AB process (adsorption/biological oxidation) promulgated in the seventies. For this purpose, a modelling framework was established to simulate the expected performance and the energy recovery potential of these processes using the currently applicable data base. The model evaluation was also extended to cover the Yenikapi plant in Istanbul as a current case study. The modelling results were discussed in view of the handicaps of gravity settling and the merit of high-rate membrane bioreactors where gravity settling would be replaced by membrane filtration. (c) 2021 Society of Chemical Industry (SCI).