TY - JOUR
T1 - Impact of different inoculum sources on the performance of membrane bioreactors for municipal wastewater treatment
T2 - Dynamic membrane versus ultrafiltration membrane
AU - Isik, Onur
AU - Cengiz, Ali Izzet
AU - Abdelrahman, Amr Mustafa
AU - Ozcelik, Kadir
AU - Yuksekdag, Ayse
AU - Koyuncu, Ismail
AU - Ersahin, Mustafa Evren
AU - Ozgun, Hale
AU - Demir, Ibrahim
N1 - Publisher Copyright:
© 2021
PY - 2022/4
Y1 - 2022/4
N2 - 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.
AB - 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.
KW - Dynamic membrane
KW - Hollow fiber
KW - Inoculum sludge
KW - Membrane bioreactor
KW - Municipal wastewater
UR - http://www.scopus.com/inward/record.url?scp=85122324451&partnerID=8YFLogxK
U2 - 10.1016/j.jwpe.2021.102549
DO - 10.1016/j.jwpe.2021.102549
M3 - Article
AN - SCOPUS:85122324451
SN - 2214-7144
VL - 46
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
M1 - 102549
ER -
