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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) The MRs of Platymonas subcordiformis by multi-trial injection with a small dose of electrolytic products; (b) The MRs of Chlorella vulgaris by multi-trial injection with small dose of electrolytic products; (c) The MRs of Prorocentrum micans by multi-trial injection with small dose of electrolytic products; (d) The MRs of Karenia mikimotoi by multi-trial injection with small dose of electrolytic products.
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ijms-16-13158-f003: (a) The MRs of Platymonas subcordiformis by multi-trial injection with a small dose of electrolytic products; (b) The MRs of Chlorella vulgaris by multi-trial injection with small dose of electrolytic products; (c) The MRs of Prorocentrum micans by multi-trial injection with small dose of electrolytic products; (d) The MRs of Karenia mikimotoi by multi-trial injection with small dose of electrolytic products.

Mentions: As mentioned above, four groups of different available chlorine concentrations and injection times were used to treat each algal species, which are Group A (2 times, 1.5 mg/L), Group B (3 times, 1 mg/L), Group C (4 times, 0.75 mg/L), Group D (5 times, 0.6 mg/L), respectively. The interval time between two times is 5 h. The MRs of the four algae species are shown separately in Figure 3a–d. We can see that MRs increase with the exposure time for each algae species under the certain available chlorine concentration. It should be noticed that the needed exposure time are different for different treatment groups when MRs reach the same value; in other words, the speed of MR increase of different treatment strategies are different. Among these four treatment strategy groups, the required exposure time of Group B is shortest when MR reaches 100%. Therefore, Group B (3 times, 1 mg/L) is chosen as an optimal strategy to treat the algal cells. Comparison between the treatment strategy of Group B and the conventional one trial injection method were conducted. The experimental results are shown in Table 1. Compared with the conventional one trial injection method, mortality rate time (MRT) and total available chlorine dose can be saved up to about 84% and 40%, respectively, under the application of the new strategy. In addition, the investigation of algal resurrection was also carried out. There is no algal resurrection phenomenon for all of the killed algal cells (MR is 100%) within 15 days after being killed.


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) The MRs of Platymonas subcordiformis by multi-trial injection with a small dose of electrolytic products; (b) The MRs of Chlorella vulgaris by multi-trial injection with small dose of electrolytic products; (c) The MRs of Prorocentrum micans by multi-trial injection with small dose of electrolytic products; (d) The MRs of Karenia mikimotoi by multi-trial injection with small dose of electrolytic products.
© Copyright Policy
Related In: Results  -  Collection

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

ijms-16-13158-f003: (a) The MRs of Platymonas subcordiformis by multi-trial injection with a small dose of electrolytic products; (b) The MRs of Chlorella vulgaris by multi-trial injection with small dose of electrolytic products; (c) The MRs of Prorocentrum micans by multi-trial injection with small dose of electrolytic products; (d) The MRs of Karenia mikimotoi by multi-trial injection with small dose of electrolytic products.
Mentions: As mentioned above, four groups of different available chlorine concentrations and injection times were used to treat each algal species, which are Group A (2 times, 1.5 mg/L), Group B (3 times, 1 mg/L), Group C (4 times, 0.75 mg/L), Group D (5 times, 0.6 mg/L), respectively. The interval time between two times is 5 h. The MRs of the four algae species are shown separately in Figure 3a–d. We can see that MRs increase with the exposure time for each algae species under the certain available chlorine concentration. It should be noticed that the needed exposure time are different for different treatment groups when MRs reach the same value; in other words, the speed of MR increase of different treatment strategies are different. Among these four treatment strategy groups, the required exposure time of Group B is shortest when MR reaches 100%. Therefore, Group B (3 times, 1 mg/L) is chosen as an optimal strategy to treat the algal cells. Comparison between the treatment strategy of Group B and the conventional one trial injection method were conducted. The experimental results are shown in Table 1. Compared with the conventional one trial injection method, mortality rate time (MRT) and total available chlorine dose can be saved up to about 84% and 40%, respectively, under the application of the new strategy. In addition, the investigation of algal resurrection was also carried out. There is no algal resurrection phenomenon for all of the killed algal cells (MR is 100%) within 15 days after being killed.

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.