Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiency
The effect of chemical cleaning and regular backwashing on the efficiency of an ultrafiltration membrane fouled during stormwater treatment was studied. Increasing backwash time from 30 to 60 s resulted in an increase in productivity by 20%. However, the productivity was highest when a backwash time...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-12-01
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| Series: | Water Reuse |
| Subjects: | |
| Online Access: | http://wreuse.iwaponline.com/content/13/4/634 |
| _version_ | 1797368625721507840 |
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| author | Saida Kaykhaii Inga Herrmann Annelie Hedström Kerstin Nordqvist Ingemar Heidfors Maria Viklander |
| author_facet | Saida Kaykhaii Inga Herrmann Annelie Hedström Kerstin Nordqvist Ingemar Heidfors Maria Viklander |
| author_sort | Saida Kaykhaii |
| collection | DOAJ |
| description | The effect of chemical cleaning and regular backwashing on the efficiency of an ultrafiltration membrane fouled during stormwater treatment was studied. Increasing backwash time from 30 to 60 s resulted in an increase in productivity by 20%. However, the productivity was highest when a backwash time of 45 s was used (3% higher than using 60 s). Chemical cleaning was carried out using an alkaline solution (NaOH with or without NaOCl) followed by acid washing with HCl. The addition of NaOCl to the cleaning chemical did not significantly increase the efficiency of chemical cleaning, and the average pure water permeability increase was 97 ± 13 LMH bar−1 after chemical cleaning with NaOH followed by HCl and 117 ± 15 LMH bar−1 after chemical cleaning with NaOH + NaOCl followed by HCl, on average. In addition, reversibility after chemical cleaning was 96 ± 67%, on average. The result from scanning electron microscopy showed that at the end of the experiments, inorganic foulants existed in both the inner layer (feed side) and the outer layer (permeate side) of the membrane.
HIGHLIGHTS
Longer backwash time resulted in higher permeability and backwash efficiency.;
Chemical cleaning using NaOH with/without NaOCl followed by acidic cleaning by HCl could recover pure water permeability and reversibility of the ultrafiltration membrane.;
A significant amount of inorganic material was found on the fouling layer.; |
| first_indexed | 2024-03-08T17:35:27Z |
| format | Article |
| id | doaj.art-f49811c862294b1382991d05bfd04f4e |
| institution | Directory Open Access Journal |
| issn | 2709-6092 2709-6106 |
| language | English |
| last_indexed | 2024-03-08T17:35:27Z |
| publishDate | 2023-12-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Reuse |
| spelling | doaj.art-f49811c862294b1382991d05bfd04f4e2024-01-02T13:03:30ZengIWA PublishingWater Reuse2709-60922709-61062023-12-0113463464610.2166/wrd.2023.106106Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiencySaida Kaykhaii0Inga Herrmann1Annelie Hedström2Kerstin Nordqvist3Ingemar Heidfors4Maria Viklander5 Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Campus Luleå, Luleå 97187, Sweden Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Campus Luleå, Luleå 97187, Sweden Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Campus Luleå, Luleå 97187, Sweden Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Campus Luleå, Luleå 97187, Sweden Purac AB, Malmö, Skåne, Sweden Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Campus Luleå, Luleå 97187, Sweden The effect of chemical cleaning and regular backwashing on the efficiency of an ultrafiltration membrane fouled during stormwater treatment was studied. Increasing backwash time from 30 to 60 s resulted in an increase in productivity by 20%. However, the productivity was highest when a backwash time of 45 s was used (3% higher than using 60 s). Chemical cleaning was carried out using an alkaline solution (NaOH with or without NaOCl) followed by acid washing with HCl. The addition of NaOCl to the cleaning chemical did not significantly increase the efficiency of chemical cleaning, and the average pure water permeability increase was 97 ± 13 LMH bar−1 after chemical cleaning with NaOH followed by HCl and 117 ± 15 LMH bar−1 after chemical cleaning with NaOH + NaOCl followed by HCl, on average. In addition, reversibility after chemical cleaning was 96 ± 67%, on average. The result from scanning electron microscopy showed that at the end of the experiments, inorganic foulants existed in both the inner layer (feed side) and the outer layer (permeate side) of the membrane. HIGHLIGHTS Longer backwash time resulted in higher permeability and backwash efficiency.; Chemical cleaning using NaOH with/without NaOCl followed by acidic cleaning by HCl could recover pure water permeability and reversibility of the ultrafiltration membrane.; A significant amount of inorganic material was found on the fouling layer.;http://wreuse.iwaponline.com/content/13/4/634dead-end filtrationfoulingpermeabilitypulsatile fluid flowrunoffstormwater treatment |
| spellingShingle | Saida Kaykhaii Inga Herrmann Annelie Hedström Kerstin Nordqvist Ingemar Heidfors Maria Viklander Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiency Water Reuse dead-end filtration fouling permeability pulsatile fluid flow runoff stormwater treatment |
| title | Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiency |
| title_full | Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiency |
| title_fullStr | Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiency |
| title_full_unstemmed | Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiency |
| title_short | Enhancing stormwater treatment through ultrafiltration: Impact of cleaning chemicals and backwash duration on membrane efficiency |
| title_sort | enhancing stormwater treatment through ultrafiltration impact of cleaning chemicals and backwash duration on membrane efficiency |
| topic | dead-end filtration fouling permeability pulsatile fluid flow runoff stormwater treatment |
| url | http://wreuse.iwaponline.com/content/13/4/634 |
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