Efficiency studies of modified IFAS-OSA system upgraded by an anoxic sludge holding tank

Mansour Fazelipour; Afshin Takdastan; Seyed Mehdi Borghei; Neda Kiasat; Marcin Glodniok; Paweł Zawartka

doi:10.1038/s41598-021-03556-6

Efficiency studies of modified IFAS-OSA system upgraded by an anoxic sludge holding tank

Sci Rep. 2021 Dec 17;11(1):24205. doi: 10.1038/s41598-021-03556-6.

Authors

Mansour Fazelipour¹, Afshin Takdastan², Seyed Mehdi Borghei³, Neda Kiasat⁴, Marcin Glodniok⁵, Paweł Zawartka⁶

Affiliations

¹ Department of Environmental Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
² Environmental Health Department, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
³ Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
⁴ Department of Medical Mycology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
⁵ Department of Water Protection, Central Mining Institute, Katowice, Poland. mglodniok@gig.eu.
⁶ Department of Water Protection, Central Mining Institute, Katowice, Poland.

Abstract

An upgraded integrated fixed-film activated sludge-oxic settling anoxic (IFAS-OSA) system is a new technology for reducing nutrients and excess sludge. The results showed that the average TN removal efficiency of the IFAS-OSA system was gradually increased up to 7.5%, while the PO₄^-3-P removal efficiency increased up-to 27%, compared with that of the IFAS system. The COD removal efficiency of the IFAS-OSA system was slightly increased up-to 5.4% and TSS removal efficiency increased up to 10.5% compared with the control system. Biomass yield coefficient (Y_obs) in the IFAS and IFAS-OSA systems were 0.44 and 0.24 (gr MLSS/ gr COD). Hence, sludge production decreased by 45%. The average SVI was decreased by 48% in IFAS-OSA system compared with IFAS. This study demonstrated the better performance of the IFAS-OSA system compared to that of the IFAS system.

Publication types

Research Support, Non-U.S. Gov't