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A New Treatment Strategy for Inactivating Algae in Ballast Water Based on Multi-Trial Injections of Chlorine.

Sun J, Wang J, Pan X, Yuan H - Int J Mol Sci (2015)

Bottom Line: Ships' ballast water can carry aquatic organisms into foreign ecosystems.In addition to other substantial approaches, a new strategy for inactivating algae is proposed based on the developed ballast water treatment system.The different experimental parameters are studied including the injection times and doses of electrolytic products.

View Article: PubMed Central - PubMed

Affiliation: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China. golden_sun@dlmu.edu.cn.

ABSTRACT
Ships' ballast water can carry aquatic organisms into foreign ecosystems. In our previous studies, a concept using ion exchange membrane electrolysis to treat ballast water has been proven. In addition to other substantial approaches, a new strategy for inactivating algae is proposed based on the developed ballast water treatment system. In the new strategy, the means of multi-trial injection with small doses of electrolytic products is applied for inactivating algae. To demonstrate the performance of the new strategy, contrast experiments between new strategies and routine processes were conducted. Four algae species including Chlorella vulgaris, Platymonas subcordiformis, Prorocentrum micans and Karenia mikimotoi were chosen as samples. The different experimental parameters are studied including the injection times and doses of electrolytic products. Compared with the conventional one trial injection method, mortality rate time (MRT) and available chlorine concentration can be saved up to about 84% and 40%, respectively, under the application of the new strategy. The proposed new approach has great potential in practical ballast water treatment. Furthermore, the strategy is also helpful for deep insight of mechanism of algal tolerance.

No MeSH data available.


(a) Before being treated; (b) After being treated. The appearance images of the algal cells (Platymonas subcordiformis) before and after being treated by using the developed ion exchange membrane electrolysis system.
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ijms-16-13158-f004: (a) Before being treated; (b) After being treated. The appearance images of the algal cells (Platymonas subcordiformis) before and after being treated by using the developed ion exchange membrane electrolysis system.

Mentions: Firstly, in ion exchange membrane electrolysis system, hypochlorous acid molecule is a key composition in available chlorine and would penetrate and damage gradually membrane of algal cells and enter the cytoplasm in algal cells [26,27,28]. It would cause the release of intracellular organic matter (IOM) and also increase the levels of dissolved organic matter (DOM). These substances would lead to the extensive damage of cell membranes and the resulting changes of external cell architecture until algal cells die [29,30]. Figure 4 shows the appearance images of the algal cells (Platymonas subcordiformis) before and after being treated by using the developed ion exchange membrane electrolysis system. Before being treated, the algal cells have spherical shapes and smooth surfaces. However, after being treated, the membranes were damaged and have some bubbles in cells.


A New Treatment Strategy for Inactivating Algae in Ballast Water Based on Multi-Trial Injections of Chlorine.

Sun J, Wang J, Pan X, Yuan H - Int J Mol Sci (2015)

(a) Before being treated; (b) After being treated. The appearance images of the algal cells (Platymonas subcordiformis) before and after being treated by using the developed ion exchange membrane electrolysis system.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4490490&req=5

ijms-16-13158-f004: (a) Before being treated; (b) After being treated. The appearance images of the algal cells (Platymonas subcordiformis) before and after being treated by using the developed ion exchange membrane electrolysis system.
Mentions: Firstly, in ion exchange membrane electrolysis system, hypochlorous acid molecule is a key composition in available chlorine and would penetrate and damage gradually membrane of algal cells and enter the cytoplasm in algal cells [26,27,28]. It would cause the release of intracellular organic matter (IOM) and also increase the levels of dissolved organic matter (DOM). These substances would lead to the extensive damage of cell membranes and the resulting changes of external cell architecture until algal cells die [29,30]. Figure 4 shows the appearance images of the algal cells (Platymonas subcordiformis) before and after being treated by using the developed ion exchange membrane electrolysis system. Before being treated, the algal cells have spherical shapes and smooth surfaces. However, after being treated, the membranes were damaged and have some bubbles in cells.

Bottom Line: Ships' ballast water can carry aquatic organisms into foreign ecosystems.In addition to other substantial approaches, a new strategy for inactivating algae is proposed based on the developed ballast water treatment system.The different experimental parameters are studied including the injection times and doses of electrolytic products.

View Article: PubMed Central - PubMed

Affiliation: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China. golden_sun@dlmu.edu.cn.

ABSTRACT
Ships' ballast water can carry aquatic organisms into foreign ecosystems. In our previous studies, a concept using ion exchange membrane electrolysis to treat ballast water has been proven. In addition to other substantial approaches, a new strategy for inactivating algae is proposed based on the developed ballast water treatment system. In the new strategy, the means of multi-trial injection with small doses of electrolytic products is applied for inactivating algae. To demonstrate the performance of the new strategy, contrast experiments between new strategies and routine processes were conducted. Four algae species including Chlorella vulgaris, Platymonas subcordiformis, Prorocentrum micans and Karenia mikimotoi were chosen as samples. The different experimental parameters are studied including the injection times and doses of electrolytic products. Compared with the conventional one trial injection method, mortality rate time (MRT) and available chlorine concentration can be saved up to about 84% and 40%, respectively, under the application of the new strategy. The proposed new approach has great potential in practical ballast water treatment. Furthermore, the strategy is also helpful for deep insight of mechanism of algal tolerance.

No MeSH data available.