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.
Highlights
The global shipping business carries more than 92% of the world’s commodities; it plays a vital role and massively contributes to world trade
It is observed that the trends of the relations among the mortality rates (MRs) and the electrolytic products concentration and the reaction time for all algal cells are almost the same
Under the certain concentrations of the available chlorine, the MR of algae increases with the exposure time
Summary
The global shipping business carries more than 92% of the world’s commodities; it plays a vital role and massively contributes to world trade. The aquatic organisms may be introduced into foreign ecosystems together with discharged ballast water. Invasive alien species are considered to be one of the greatest threats to biodiversity and have become a national as well as international issue [2]. The invasion of alien species has become one of the four major threats for the marine ecological environment [4,5]. There are several established and under developed technologies available to be used for ballast water treatment. These techniques are used to mitigate the introduction of non-indigenous aquatic nuisance species from ships’ ballast water
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
