Impact of different inoculum sources on the performance of membrane bioreactors for municipal wastewater treatment: Dynamic membrane versus ultrafiltration membrane

Onur Isik*, Ali Izzet Cengiz, Amr Mustafa Abdelrahman, Kadir Ozcelik, Ayse Yuksekdag, Ismail Koyuncu, Mustafa Evren Ersahin, Hale Ozgun, Ibrahim Demir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

In this study, impact of different inoculum on the performance of membrane bioreactors (MBRs) was investigated for municipal wastewater treatment. Waste sludges from a conventional activated sludge (CAS) system and a high-rate activated sludge (HRAS) system were used as inoculums at Stage-1 and Stage-2, respectively. A commercial ultrafiltration (UF) membrane was tested in parallel with a low-cost polyester hollow fiber support material (dynamic membrane, DM). UF and DM membranes were operated for 67 days at a flux of 8 L/m2·h at each stage. High chemical oxygen demand (COD) and soluble COD (sCOD) removal efficiencies (>86% and >74%, respectively), low mixed liquor suspended solids (MLSS) concentration (<10 mg/L), and low turbidity values were achieved in permeates at each stage. Extracellular polymeric substances (EPS) content was higher at Stage-1, which caused an increase in sludge resistance to filtration (SRF) and sludge volume index (SVI). Based on morphological analysis, compact dynamic cake layer was formed on the support material at Stage-1, while porous dynamic layer was formed at Stage-2. Thus, DM was operated at lower TMP at Stage-2. Based on the results obtained from the study, sludge from HRAS system showed better performance as inoculum compared to the sludge from CAS system for DM applications.

Original languageEnglish
Article number102549
JournalJournal of Water Process Engineering
Volume46
DOIs
Publication statusPublished - Apr 2022

Bibliographical note

Publisher Copyright:
© 2021

Funding

This study was financed by Istanbul Technical University , Scientific Research Projects: Ali Izzet Cengiz (Project No: MYL-2021-42988 ) and Onur Isik (Project No: MKD-2017-40987 ). The authors would like to express their gratitude for the financial and technical support provided by MEM-TEK National Research Center on Membrane Technologies .

FundersFunder number
Ali Izzet CengizMYL-2021-42988, MKD-2017-40987
Istanbul Teknik Üniversitesi

    Keywords

    • Dynamic membrane
    • Hollow fiber
    • Inoculum sludge
    • Membrane bioreactor
    • Municipal wastewater

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