Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate Oxidation
Harmful algal blooms (HABs) caused by <i>Heterosigma akashiwo</i> are occurring in coastal waters frequently, posing a great risk to marine environments and subsequent treatment processes like desalination. UV-assisted permanganate oxidation (UV/KMnO<sub>4</sub>) is recognize...
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| Format: | Article |
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MDPI AG
2023-10-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/20/3633 |
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| author | Jianwei Zeng Xuegang Chen Shidi Jin Jiajia Fan |
| author_facet | Jianwei Zeng Xuegang Chen Shidi Jin Jiajia Fan |
| author_sort | Jianwei Zeng |
| collection | DOAJ |
| description | Harmful algal blooms (HABs) caused by <i>Heterosigma akashiwo</i> are occurring in coastal waters frequently, posing a great risk to marine environments and subsequent treatment processes like desalination. UV-assisted permanganate oxidation (UV/KMnO<sub>4</sub>) is recognized as an innovative advanced oxidation process. This study investigated the inactivation and removal efficiencies of <i>H. akashiwo</i> cells by UV/KMnO<sub>4</sub>. Algal cells were effectively disintegrated into fragments by UV/KMnO<sub>4</sub>. Also, the degradation of photosynthetic pigments, membrane lipid peroxidation, and severe oxidative stress in algal cells was observed. The removal efficiency of algal cells reached 80.2% by 20 min of UV/KMnO<sub>4</sub> oxidation, with a KMnO<sub>4</sub> dosage of 5 mg L<sup>−1</sup>. In addition, the residual algal cells could be completely removed by a subsequent self-settling process, without an additional coagulation procedure. The fragmentation of algal cells caused by UV/KMnO<sub>4</sub> may facilitate the formation of algal flocs, thereby improving the cell settleability. Furthermore, UV<sub>254</sub> was significantly reduced by UV/KMnO<sub>4</sub>, which is expected to reduce the formation of disinfection byproducts and membrane fouling. This study elucidates that UV/KMnO<sub>4</sub> can be a promising technique for the efficient treatment of harmful marine algae. |
| first_indexed | 2024-03-10T20:49:11Z |
| format | Article |
| id | doaj.art-c78cebe24c8e4ea384052fb54eb2c3fd |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T20:49:11Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-c78cebe24c8e4ea384052fb54eb2c3fd2023-11-19T18:30:35ZengMDPI AGWater2073-44412023-10-011520363310.3390/w15203633Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate OxidationJianwei Zeng0Xuegang Chen1Shidi Jin2Jiajia Fan3Ocean College, Zhejiang University, Hangzhou 310058, ChinaOcean College, Zhejiang University, Hangzhou 310058, ChinaOcean College, Zhejiang University, Hangzhou 310058, ChinaSchool of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, ChinaHarmful algal blooms (HABs) caused by <i>Heterosigma akashiwo</i> are occurring in coastal waters frequently, posing a great risk to marine environments and subsequent treatment processes like desalination. UV-assisted permanganate oxidation (UV/KMnO<sub>4</sub>) is recognized as an innovative advanced oxidation process. This study investigated the inactivation and removal efficiencies of <i>H. akashiwo</i> cells by UV/KMnO<sub>4</sub>. Algal cells were effectively disintegrated into fragments by UV/KMnO<sub>4</sub>. Also, the degradation of photosynthetic pigments, membrane lipid peroxidation, and severe oxidative stress in algal cells was observed. The removal efficiency of algal cells reached 80.2% by 20 min of UV/KMnO<sub>4</sub> oxidation, with a KMnO<sub>4</sub> dosage of 5 mg L<sup>−1</sup>. In addition, the residual algal cells could be completely removed by a subsequent self-settling process, without an additional coagulation procedure. The fragmentation of algal cells caused by UV/KMnO<sub>4</sub> may facilitate the formation of algal flocs, thereby improving the cell settleability. Furthermore, UV<sub>254</sub> was significantly reduced by UV/KMnO<sub>4</sub>, which is expected to reduce the formation of disinfection byproducts and membrane fouling. This study elucidates that UV/KMnO<sub>4</sub> can be a promising technique for the efficient treatment of harmful marine algae.https://www.mdpi.com/2073-4441/15/20/3633harmful marine algaecell removaloxidative damageself-settlingUV/KMnO<sub>4</sub> process |
| spellingShingle | Jianwei Zeng Xuegang Chen Shidi Jin Jiajia Fan Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate Oxidation Water harmful marine algae cell removal oxidative damage self-settling UV/KMnO<sub>4</sub> process |
| title | Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate Oxidation |
| title_full | Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate Oxidation |
| title_fullStr | Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate Oxidation |
| title_full_unstemmed | Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate Oxidation |
| title_short | Efficient Inactivation and Removal of a Harmful Marine Algae—<i>Heterosigma akashiwo</i>—By UV-Assisted Permanganate Oxidation |
| title_sort | efficient inactivation and removal of a harmful marine algae i heterosigma akashiwo i by uv assisted permanganate oxidation |
| topic | harmful marine algae cell removal oxidative damage self-settling UV/KMnO<sub>4</sub> process |
| url | https://www.mdpi.com/2073-4441/15/20/3633 |
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