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Open AccessArticle

Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability

1
School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China
2
Department of Civil and Environmental Engineering, Texas Tech University, 10th and Akron, Lubbock, TX 79409-1023, USA
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(7), 85; https://doi.org/10.3390/membranes9070085
Received: 9 June 2019 / Revised: 5 July 2019 / Accepted: 11 July 2019 / Published: 16 July 2019
In 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. View Full-Text
Keywords: membrane bioreactor; transmembrane pressure; membrane foulants; aggregation; extracellular polymeric substances membrane bioreactor; transmembrane pressure; membrane foulants; aggregation; extracellular polymeric substances
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MDPI and ACS Style

Yan, L.; Li, R.; Song, Y.; Jia, Y.; Li, Z.; Song, L.; Zhang, H. Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability. Membranes 2019, 9, 85.

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