TY - JOUR
T1 - Influence of immersion depth of membrane on filtration performance of anaerobic membrane bioreactor
AU - Pang, Chao
AU - Ren, Xuesong
AU - Zhang, Xuedong
AU - Hu, Zhenhu
AU - Wang, Wei
PY - 2020
Y1 - 2020
N2 - Membrane fouling is still the main obstacle that hinders the development and implementation of anaerobic membrane bioreactor (AnMBR). In conventional upflow anaerobic reactors, sludge at different height usually presents certain differences in characteristics in terms of particle size, etc. The immersion depth of membrane modules in anaerobic reactors can also influence the fouling of membrane. Thus, it is of great interest to investigate the fouling mechanism with the membrane installed at different heights in reactors. The filtration performance and sludge properties were investigated at different heights of AnMBR. The fouling of membrane in the middle position was severer than that in the top and bottom positions. The total resistance of membrane in the top, middle, and bottom positions was 27.31 × 1011 m−1, 34.67 × 1011 m−1, and 25.29 × 1011 m−1, respectively. By comparing the characteristics and structure of bulk sludge and cake layer at three heights, the bulk sludge in the middle position presented higher content of soluble microbial products (SMP) and finer flocs, and the cake layer was also denser. The results obtained in this study indicated that small size of sludge flocs as well as adhesion of SMP might be the major factors governing membrane fouling at different height in the AnMBR.
AB - Membrane fouling is still the main obstacle that hinders the development and implementation of anaerobic membrane bioreactor (AnMBR). In conventional upflow anaerobic reactors, sludge at different height usually presents certain differences in characteristics in terms of particle size, etc. The immersion depth of membrane modules in anaerobic reactors can also influence the fouling of membrane. Thus, it is of great interest to investigate the fouling mechanism with the membrane installed at different heights in reactors. The filtration performance and sludge properties were investigated at different heights of AnMBR. The fouling of membrane in the middle position was severer than that in the top and bottom positions. The total resistance of membrane in the top, middle, and bottom positions was 27.31 × 1011 m−1, 34.67 × 1011 m−1, and 25.29 × 1011 m−1, respectively. By comparing the characteristics and structure of bulk sludge and cake layer at three heights, the bulk sludge in the middle position presented higher content of soluble microbial products (SMP) and finer flocs, and the cake layer was also denser. The results obtained in this study indicated that small size of sludge flocs as well as adhesion of SMP might be the major factors governing membrane fouling at different height in the AnMBR.
KW - Anaerobic digestion
KW - Anaerobic membrane bioreactor
KW - Extracellular polymeric substances
KW - Immersion depth
KW - Membrane fouling
KW - Soluble microbial products
UR - http://www.scopus.com/inward/record.url?scp=85084986571&partnerID=8YFLogxK
U2 - 10.1007/s11356-020-09213-1
DO - 10.1007/s11356-020-09213-1
M3 - Article
AN - SCOPUS:85084986571
SN - 0944-1344
VL - 27
SP - 29433
EP - 29440
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 23
ER -