TY - JOUR
T1 - New insights into the rapid formation of initial membrane fouling after in-situ cleaning in a membrane bioreactor
AU - Sun, Ming
AU - Yan, Linlin
AU - Zhang, Lanhe
AU - Song, Lianfa
AU - Guo, Jingbo
AU - Zhang, Haifeng
PY - 2019/3
Y1 - 2019/3
N2 - In-situ chemical cleaning with sodium hypochlorite (NaClO) is often employed for maintaining constant permeability in a membrane bioreactor (MBR). In this study, the effect of NaClO shock on the rapid formation of initial membrane fouling was investigated over the course of the in-situ cleaning of a MBR. Variations of trans-membrane pressure (TMP) in the different runs indicated that the bulk sludge after NaClO-shock promotes the rapid formation of initial membrane fouling. After in-situ cleaning, the sludge had a high protein content in different extracellular polymeric substance layers and a substantial deterioration in sludge filterability compared to raw sludge. Based on the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, NaClO shock significantly changes the surface properties of raw sludge. It reduces the surface electron donor component (γ − ) and increases surface hydrophobicity. The sludge after NaClO-shock exhibited a stronger adhesive energy with the membrane and higher self-cohesive ability, resulting in severe membrane fouling.
AB - In-situ chemical cleaning with sodium hypochlorite (NaClO) is often employed for maintaining constant permeability in a membrane bioreactor (MBR). In this study, the effect of NaClO shock on the rapid formation of initial membrane fouling was investigated over the course of the in-situ cleaning of a MBR. Variations of trans-membrane pressure (TMP) in the different runs indicated that the bulk sludge after NaClO-shock promotes the rapid formation of initial membrane fouling. After in-situ cleaning, the sludge had a high protein content in different extracellular polymeric substance layers and a substantial deterioration in sludge filterability compared to raw sludge. Based on the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, NaClO shock significantly changes the surface properties of raw sludge. It reduces the surface electron donor component (γ − ) and increases surface hydrophobicity. The sludge after NaClO-shock exhibited a stronger adhesive energy with the membrane and higher self-cohesive ability, resulting in severe membrane fouling.
KW - Extracellular polymeric substances
KW - In-situ membrane cleaning
KW - Interactions energy
KW - Membrane bioreactor
KW - Membrane fouling potential
UR - http://www.scopus.com/inward/record.url?scp=85059771008&partnerID=8YFLogxK
U2 - 10.1016/j.procbio.2019.01.004
DO - 10.1016/j.procbio.2019.01.004
M3 - Article
AN - SCOPUS:85059771008
VL - 78
SP - 108
EP - 113
JO - Process Biochemistry
JF - Process Biochemistry
SN - 1359-5113
ER -