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

Fazelipour, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1038/s41598-021-03556-6
  3. Publisher: Nature Research , 2021
  4. Abstract:
  5. 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 (Yobs) 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. © 2021, The Author(s)
  6. Keywords:
  7. Activated sludge ; Chemical oxygen demand ; Control system ; Controlled study ; Plant yield
  8. Source: Scientific Reports ; Volume 11, Issue 1 , 2021 ; 20452322 (ISSN)
  9. URL: https://www.nature.com/articles/s41598-021-03556-6