Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon
Powered Activated Carbon – Membrane Bioreactors (PAC-MBRs) have been used with good results for slightly polluted water treatment. Our batch experiments showed that the transmembrane pressure of a PAC-MBR was 25% less than that of a MBR in one period of test, which indicated that PAC did help contro...
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| Format: | Article |
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IWA Publishing
2021-03-01
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| Series: | Water Science and Technology |
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| Online Access: | http://wst.iwaponline.com/content/83/5/1005 |
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| author | Yongji Zhang Xiaotong Wang Hexiu Ye Lingling Zhou Zhiling Zhao |
| author_facet | Yongji Zhang Xiaotong Wang Hexiu Ye Lingling Zhou Zhiling Zhao |
| author_sort | Yongji Zhang |
| collection | DOAJ |
| description | Powered Activated Carbon – Membrane Bioreactors (PAC-MBRs) have been used with good results for slightly polluted water treatment. Our batch experiments showed that the transmembrane pressure of a PAC-MBR was 25% less than that of a MBR in one period of test, which indicated that PAC did help control the fouling in MBRs. Based on this observation, several mechanisms of membrane fouling of MBRs and PAC-MBRs were investigated to have some insight into how PAC brought a positive impact. The total resistances decreased by 60% and different resistances were redistributed after adding PAC. The dominant one changed from filtration resistance to cake resistance. These smaller cake resistances resulted from the PAC because, showing in the scanning electron microscopy pictures, it made the cake layer looser and rougher than that on a normal membrane. Meanwhile, the analysis of the membrane eluent showed that the addition of PAC changed the microbial species and its metabolites on the membrane and effectively reduced the adsorption of hydrophilic organic molecules on the membrane surface. Additionally, PAC prevented polypeptide compounds from being trapped inside the pores of membranes, so the cake on the PAC-MBR contaminated membrane surface was easier to scrape off. In the test of cleaning methods, alkaline cleaning removed the most organics from contaminated membranes to restore membrane performance. |
| first_indexed | 2024-12-14T14:55:38Z |
| format | Article |
| id | doaj.art-ffc2a2b5ccbf40ea817cbf1c325593ae |
| institution | Directory Open Access Journal |
| issn | 0273-1223 1996-9732 |
| language | English |
| last_indexed | 2024-12-14T14:55:38Z |
| publishDate | 2021-03-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Science and Technology |
| spelling | doaj.art-ffc2a2b5ccbf40ea817cbf1c325593ae2022-12-21T22:57:00ZengIWA PublishingWater Science and Technology0273-12231996-97322021-03-018351005101610.2166/wst.2021.037037Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbonYongji Zhang0Xiaotong Wang1Hexiu Ye2Lingling Zhou3Zhiling Zhao4 State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China and Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China and Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China and Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China and Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China College of Civil Engineering, Huaqiao University, Jimei District, Xiamen 361021, China Powered Activated Carbon – Membrane Bioreactors (PAC-MBRs) have been used with good results for slightly polluted water treatment. Our batch experiments showed that the transmembrane pressure of a PAC-MBR was 25% less than that of a MBR in one period of test, which indicated that PAC did help control the fouling in MBRs. Based on this observation, several mechanisms of membrane fouling of MBRs and PAC-MBRs were investigated to have some insight into how PAC brought a positive impact. The total resistances decreased by 60% and different resistances were redistributed after adding PAC. The dominant one changed from filtration resistance to cake resistance. These smaller cake resistances resulted from the PAC because, showing in the scanning electron microscopy pictures, it made the cake layer looser and rougher than that on a normal membrane. Meanwhile, the analysis of the membrane eluent showed that the addition of PAC changed the microbial species and its metabolites on the membrane and effectively reduced the adsorption of hydrophilic organic molecules on the membrane surface. Additionally, PAC prevented polypeptide compounds from being trapped inside the pores of membranes, so the cake on the PAC-MBR contaminated membrane surface was easier to scrape off. In the test of cleaning methods, alkaline cleaning removed the most organics from contaminated membranes to restore membrane performance.http://wst.iwaponline.com/content/83/5/1005membrane foulingpac-mbrsslightly polluted source watersurface morphologies |
| spellingShingle | Yongji Zhang Xiaotong Wang Hexiu Ye Lingling Zhou Zhiling Zhao Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon Water Science and Technology membrane fouling pac-mbrs slightly polluted source water surface morphologies |
| title | Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon |
| title_full | Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon |
| title_fullStr | Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon |
| title_full_unstemmed | Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon |
| title_short | Effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon |
| title_sort | effect and mechanism of reduced membrane bioreactor fouling by powdered activated carbon |
| topic | membrane fouling pac-mbrs slightly polluted source water surface morphologies |
| url | http://wst.iwaponline.com/content/83/5/1005 |
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