title: A New Treatment Strategy for Inactivating Algae in Ballast Water Based on Multi-Trial Injections of Chlorine.
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.
authors.affiliation: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China. golden_sun@dlmu.edu.cn.
authors.forename: Jinyang
authors.initials: J
authors.lastname: Sun
authors.affiliation: College of Information and Science Technology, Dalian Maritime University, Dalian 116026, China. wangjsh@dlmu.edu.cn.
authors.forename: Junsheng
authors.initials: J
authors.lastname: Wang
authors.affiliation: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China. panxx@dlmu.edu.cn.
authors.forename: Xinxiang
authors.initials: X
authors.lastname: Pan
authors.affiliation: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China. yuanhc@dlmu.edu.cn.
authors.forename: Haichao
authors.initials: H
authors.lastname: Yuan
mesh_terms: D002713:Chlorine / Q000494:pharmacology*; D000460:Chlorophyta / Q000187:drug effects*; D004572:Electrolysis / Q000379:methods; D007475:Ion Exchange Resins; D012767:Ships; D018508:Water Purification / Q000379:methods*
chemical_list: D007475:Ion Exchange Resins; D002713:Chlorine
keywords: algal; ballast water treatment; chlorine; ion-exchange membrane electrolysis; multi-injection