Enhancing the efficacy of electrolytic chlorination for ballast water treatment by adding carbon dioxide
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Title
- Enhancing the efficacy of electrolytic chlorination for ballast water treatment by adding carbon dioxide
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Author(s)
- Cha, Hyung-Gon; Seo, Min-Ho; Lee, Heon-Young; Lee, Ji-Hyun; Lee, Dong-Sup; Shin, Kyoungsoon; Choi, Keun-Hyung
- KIOST Author(s)
- Cha, Hyung Gon(차형곤); Shin, Kyoung Soon(신경순)
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Alternative Author(s)
- 차형곤; 서민호; 신경순
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Publication Year
- 2015-06-15
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Abstract
- We examined the synergistic effects of CO2 injection on electro-chlorination in disinfection of plankton and bacteria in simulated ballast water. Chlorination was performed at dosages of 4 and 6 ppm with and without CO2 injection on electro-chlorination. Testing was performed in both seawater and brackish water quality as defined by IMO G8 guidelines. CO2 injection notably decreased from the control the number of Artemia franciscana, a brine shrimp, surviving during a 5-day post-treatment incubation (1.8 and 23 log(10) reduction in seawater and brackish water, respectively at 6 ppm TRO + CO2) compared with water electro-chlorinated only (1.2 and 1.3 log(10) reduction in seawater and brackish water, respectively at 6 ppm TRO). The phytoplankton Tetraselmis suecica, was completely disinfected with no live cell found at >4 ppm TRO with and without CO2 addition. The effects of CO2 addition on heterotrophic bacterial growth was not different from electro-chlorination only. Total residual oxidant concentration (TRO) more rapidly declined in electro-chlorination of both marine and brackish waters compared to chlorine + CO2 treated waters, with significantly higher amount of TRO being left in waters treated with the CO2 addition. Total concentration of trihalomethanes (THMs) and haloacetic acids (HAAs) measured at day 0 in brackish water test were found to be 2- to 3-fold higher in 6 ppm TRO + CO2-treated water than in 6 ppm TRO treated water. The addition of CO2 to electro-chlorination may improve the efficiency of this sterilizing treatment of ballast water, yet the increased production of some disinfection byproducts needs further study. (C) 2015 Elsevier Ltd. All rights reserved.
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ISSN
- 0025-326X
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/2459
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DOI
- 10.1016/j.marpolbul.2015.03.025
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Bibliographic Citation
- MARINE POLLUTION BULLETIN, v.95, no.1, pp.315 - 323, 2015
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Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
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Subject
- DISINFECTION BY-PRODUCTS; CO2; ORGANISMS; MODELS
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Keywords
- Electrochlorination; Carbon dioxide; Synergistic effects; Ballast water
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Type
- Article
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Language
- English
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Document Type
- Article
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