Coupling high-rate activated sludge process with aerobic granular sludge process for sustainable municipal wastewater treatment

Sadiye Kosar*, Onur Isik, Busra Cicekalan, Hazal Gulhan, Seyma Cingoz, Mustafa Yoruk, Hale Ozgun, Ismail Koyuncu, Mark C.M. van Loosdrecht, Mustafa Evren Ersahin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Achieving a neutral/positive energy balance without compromising discharge standards is one of the main goals of wastewater treatment plants (WWTPs) in terms of sustainability. Aerobic granular sludge (AGS) technology promises high treatment performance with low energy and footprint requirement. In this study, high-rate activated sludge (HRAS) process was coupled to AGS process as an energy-efficient pre-treatment option in order to increase energy recovery from municipal wastewater and decrease the particulate matter load of AGS process. Three different feeding strategies were applied throughout the study. AGS system was fed with raw municipal wastewater, with the effluent of HRAS process, and with the mixture of the effluent of HRAS process and raw municipal wastewater at Stage 1, Stage 2 and Stage 3, respectively. Total suspended solids (TSS), chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), and total phosphorus (TP) concentrations in the effluent were less than 10 mg/L, 60 mg/L, 0.4 mg/L, and 1.3 mg/L respectively at all stages. Fluctuations were observed in the denitrification performance due to changes in the influent COD/total nitrogen (TN) ratio. This study showed that coupling HRAS process with AGS process by feeding the AGS process with the mixture of HRAS process effluent and raw municipal wastewater could be an appropriate option for both increasing the energy recovery potential of WWTPs and enabling high effluent quality.

Original languageEnglish
Article number116549
JournalJournal of Environmental Management
Volume325
DOIs
Publication statusPublished - 1 Jan 2023

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

Funding

The authors would like to express their gratitude for the PhD Fellowship provided by YOK 100/2000 Scholarship Programme to Sadiye Kosar, by the Council of Higher Education of Turkey. This study was supported by Scientific Research Projects Department of Istanbul Technical University (Project No: MDK-2019-42173 ). This research was funded by Istanbul Water and Sewerage Administration (ISKI) with the project titled as “Treatment of Wastewaters from ISKI Baltalimanı Wastewater Treatment Plant by Aerobic Granular Sludge System in Low Cost and Low Footprint”.

FundersFunder number
Council of Higher Education of Turkey
ISKI
Istanbul Water and Sewerage Administration
Scientific Research Projects Department of Istanbul Technical UniversityMDK-2019-42173

    Keywords

    • Aerobic granular sludge
    • Energy recovery
    • High-rate activated sludge
    • Municipal wastewater
    • Sustainability

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