Characterization of the fouling layer on the membrane surface in a membrane bioreactor: Evolution of the foulants’ composition and aggregation ability

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dc.creatorYan, Linlin
dc.creatorLi, Ruixue
dc.creatorSong, Yu
dc.creatorJia, Yanping
dc.creatorLi, Zheng
dc.creatorSong, Lianfa (TTU)
dc.creatorZhang, Haifeng
dc.date.accessioned2023-03-31T15:00:47Z
dc.date.available2023-03-31T15:00:47Z
dc.date.issued2019
dc.description© 2019 by the authors. Licensee MDPI, Basel, Switzerland. cc-by
dc.description.abstractIn this study, the characteristics of membrane foulants were analyzed with regard to morphology, composition, and aggregation ability during the three stages of transmembrane pressure (TMP) development (fast–slow–fast rise in TMP) in a steady operational membrane bioreactor (MBR). The results obtained show that the fouling layer at the slow TMP-increase stage possessed a higher average roughness (71.27 nm) and increased fractal dimension (2.33), which resulted in a low membrane fouling rate (0.87 kPa/d). A higher extracellular DNA (eDNA) proportion (26.12%) in the extracellular polymeric substances (EPS) resulted in both higher zeta potential (-23.3 mV) and higher hydrophobicity (82.3%) for initial foulants, which induced and increased the protein proportion in the subsequent fouling layer (74.11%). Furthermore, the main composition of the EPS shifted from protein toward polysaccharide dominance in the final fouling layer. The aggregation test confirmed that eDNA was essential for foulant aggregation in the initial fouling layer, whereas ion interaction significantly affected foulant aggregation in the final fouling layer.
dc.identifier.citationYan, L., Li, R., Song, Y., Jia, Y., Li, Z., Song, L., & Zhang, H.. 2019. Characterization of the fouling layer on the membrane surface in a membrane bioreactor: Evolution of the foulants’ composition and aggregation ability. Membranes, 9(7). https://doi.org/10.3390/membranes9070085
dc.identifier.urihttps://doi.org/10.3390/membranes9070085
dc.identifier.urihttps://hdl.handle.net/2346/92229
dc.language.isoeng
dc.subjectAggregation
dc.subjectExtracellular polymeric substances
dc.subjectMembrane bioreactor
dc.subjectMembrane foulants
dc.subjectTransmembrane pressure
dc.titleCharacterization of the fouling layer on the membrane surface in a membrane bioreactor: Evolution of the foulants’ composition and aggregation ability
dc.typeArticle

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