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Liao G, Bin L, Tang B, Li P, Qiu B, Huang Z, Huang S, Fu F. Insights into the fouling layer of flat-sheet membrane and its development in an integrated oxidation ditch-membrane bioreactor. Bioresour Technol 2022; 345:126466. [PMID: 34864179 DOI: 10.1016/j.biortech.2021.126466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/22/2021] [Accepted: 11/27/2021] [Indexed: 06/13/2023]
Abstract
This work revealed the characteristics of fouling layer on the flat-sheet membranes and its development in an integrated oxidation-ditch membrane bioreactor. During the operation period (130 days), the reactor performed very well in removing pollutants. As the operation proceeded, membrane fouling occurred on the flat-sheet membranes and trans-membrane pressure showed a cyclical variation. The experimental results showed that the process of membrane fouling appeared successively in two different structures: biofilm (BF) and sludge fouling (SF). The substances causing membrane fouling were mainly organic foulants and a small amount of inorganic metal compounds, especially the protein-like and fulvic acid-like substances in loosely bound extracellular polymeric substances (LB-EPS). The analysis of microbial communities revealed that SF and BF had very different microbial properties. Although most membrane foulants could be removed by physical and chemical cleaning methods, the protein-like and fulvic acid-like substances in BF were contribute much to causing irreversible membrane fouling.
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Affiliation(s)
- Guohao Liao
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Liying Bin
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Bing Tang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
| | - Ping Li
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Bangqiao Qiu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Zhaole Huang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Shaosong Huang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Fenglian Fu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
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Sano T, Koga Y, Ito H, Duc LV, Hama T, Kawagoshi Y. Effects of structural vulnerability of flat-sheet membranes on fouling development in continuous submerged membrane bioreactors. Bioresour Technol 2020; 304:123015. [PMID: 32088629 DOI: 10.1016/j.biortech.2020.123015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/08/2020] [Accepted: 02/11/2020] [Indexed: 06/10/2023]
Abstract
The relationship between fouling development in a continuous laboratory-scale membrane reactor (MBR/Lab) and the membrane material was investigated using flat-sheet membranes prepared from four materials (polyvinylidene difluoride (PVDF), polyethersulfone, chlorinated polyvinyl chloride, and polytetrafluoroethylene). Further, the characteristics of the suspension liquid in MBR/Lab were compared with those of samples from actual wastewater treatment plants. It was found that, in addition to the membrane material's own characteristics, the structural vulnerability of the membranes had a determining effect on fouling development. The PVDF membrane showed the highest transmembrane pressure during MBR operation and its surface experienced significant damage because of the shearing stress caused by aeration, resulting in the penetration of the membrane by the fouling compounds. The characteristics of suspension liquid in MBR/Lab were almost similar to those in the MBR at a night-soil treatment plant and the aeration tank of a sewage treatment plant.
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Affiliation(s)
- Toshio Sano
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Yoshiki Koga
- City of Kitakyushu, 1-1 Jonai, Kokurakita-ku, Kitakyushu 803-8501, Japan
| | - Hiroaki Ito
- Center for Water Cycle, Marine Environment and Disaster Management (CWMD), Kumamoto University, 2-39-1 Kurokami, Chuo-Ku, Kumamoto 860-8555, Japan
| | - Luong Van Duc
- Center for Water Cycle, Marine Environment and Disaster Management (CWMD), Kumamoto University, 2-39-1 Kurokami, Chuo-Ku, Kumamoto 860-8555, Japan
| | - Takehide Hama
- Center for Water Cycle, Marine Environment and Disaster Management (CWMD), Kumamoto University, 2-39-1 Kurokami, Chuo-Ku, Kumamoto 860-8555, Japan
| | - Yasunori Kawagoshi
- Center for Water Cycle, Marine Environment and Disaster Management (CWMD), Kumamoto University, 2-39-1 Kurokami, Chuo-Ku, Kumamoto 860-8555, Japan.
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Mansur S, Othman MHD, Ismail AF, Kadir SHSA, Goh PS, Hasbullah H, Ng BC, Abdullah MS, Kamal F, Abidin MNZ, Lusiana RA. Synthesis and characterisation of composite sulphonated polyurethane/polyethersulphone membrane for blood purification application. Mater Sci Eng C Mater Biol Appl 2019; 99:491-504. [PMID: 30889724 DOI: 10.1016/j.msec.2019.01.092] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Revised: 01/18/2019] [Accepted: 01/20/2019] [Indexed: 11/26/2022]
Abstract
Polyurethane (PU) with three different functional groups: carboxyl, hydroxyl and sulphonyl group on its molecular structure were synthesised in this work. The synthesised material suppresses blood clotting and exhibits anticoagulant characteristics due to the presence of the important anionic groups. The synthesised PU was blended with polyethersulphone (PES) and fabricated into flat-sheet membrane to study the physico-chemical and biocompatibility properties of the PES membrane for blood purification application. PES-PU flat-sheet membranes were fabricated via the dry-wet phase separation technique. Different loading of PU (0, 1, 2, 3, 4, and 5%) blended with PES was studied and compared. Based on the in-vitro biocompatibility analysis of the membrane, it can be suggested that the membrane incorporated with PU has better anticoagulant properties compared to the pristine PES membrane. PU incorporation prolonged the clotting time, decreased the formation of thrombin, decreased soluble complement component 3a (C3a) generation and suppressed platelet adhesion and aggregation. The anionic groups on the membrane surface might bind to coagulation factors (antithrombin) and the calcium ions, Ca2+ and thus improve anticoagulant ability. Based on both physico-chemical and in-vitro studied, 4% loading of PU is the optimum loading for incorporation with PES membrane. These results suggested that the blended PES-PU membranes with good haemocompatibility allowed practical application in the field of blood purification.
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Affiliation(s)
- Sumarni Mansur
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
| | - Mohd Hafiz Dzarfan Othman
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia.
| | - Ahmad Fauzi Ismail
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
| | - Siti Hamimah Sheikh Abdul Kadir
- Institute of Molecular Medicine and Biotechnology, Faculty of Medicine, Universiti Teknologi Mara Sungai Buloh Campus, Jalan Hospital, 47000 Sungai Buloh, Selangor, Malaysia
| | - Pei Sean Goh
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
| | - Hasrinah Hasbullah
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
| | - Be Cheer Ng
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
| | - Mohd Sohaimi Abdullah
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
| | - Fatmawati Kamal
- Institute of Molecular Medicine and Biotechnology, Faculty of Medicine, Universiti Teknologi Mara Sungai Buloh Campus, Jalan Hospital, 47000 Sungai Buloh, Selangor, Malaysia
| | - Muhammad Nidzhom Zainol Abidin
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering (SCEE), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
| | - Retno Ariadi Lusiana
- Department of Chemistry, Faculty of Science and Mathematics, Universitas Diponegoro, Jalan.Prof. Soedarto, S.H.Tembalang, Tembalang, Kota Semarang, Jawa Tengah 50275, Indonesia
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