Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability
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)...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-07-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/9/7/85 |
| _version_ | 1827842344028733440 |
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| author | Linlin Yan Ruixue Li Yu Song Yanping Jia Zheng Li Lianfa Song Haifeng Zhang |
| author_facet | Linlin Yan Ruixue Li Yu Song Yanping Jia Zheng Li Lianfa Song Haifeng Zhang |
| author_sort | Linlin Yan |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T08:08:08Z |
| format | Article |
| id | doaj.art-b2fb8a7130f34796bcd93f6cd48d3f2e |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T08:08:08Z |
| publishDate | 2019-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-b2fb8a7130f34796bcd93f6cd48d3f2e2023-09-02T19:23:15ZengMDPI AGMembranes2077-03752019-07-01978510.3390/membranes9070085membranes9070085Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation AbilityLinlin Yan0Ruixue Li1Yu Song2Yanping Jia3Zheng Li4Lianfa Song5Haifeng Zhang6School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, ChinaSchool of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, ChinaSchool of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, ChinaSchool of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, ChinaSchool of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, ChinaDepartment of Civil and Environmental Engineering, Texas Tech University, 10th and Akron, Lubbock, TX 79409-1023, USASchool of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, ChinaIn 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.https://www.mdpi.com/2077-0375/9/7/85membrane bioreactortransmembrane pressuremembrane foulantsaggregationextracellular polymeric substances |
| spellingShingle | Linlin Yan Ruixue Li Yu Song Yanping Jia Zheng Li Lianfa Song Haifeng Zhang Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability Membranes membrane bioreactor transmembrane pressure membrane foulants aggregation extracellular polymeric substances |
| title | Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability |
| title_full | Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability |
| title_fullStr | Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability |
| title_full_unstemmed | Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability |
| title_short | Characterization of the Fouling Layer on the Membrane Surface in a Membrane Bioreactor: Evolution of the Foulants’ Composition and Aggregation Ability |
| title_sort | characterization of the fouling layer on the membrane surface in a membrane bioreactor evolution of the foulants composition and aggregation ability |
| topic | membrane bioreactor transmembrane pressure membrane foulants aggregation extracellular polymeric substances |
| url | https://www.mdpi.com/2077-0375/9/7/85 |
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