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ผู้เขียน หัวข้อ: Impact of ozonation on water quality in marine recirculation systems  (อ่าน 2500 ครั้ง)
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« เมื่อ: เมษายน 05, 2010, 09:43:11 AM »

Impact of ozonation on water quality in marine recirculation systems

Martin S. Tango and Graham A. Gagnon

Department of Civil Engineering, Dalhousie University, Halifax, NS, Canada B3J 1Z1
Available online 27 August 2003.

Abstract
Ozone (O3) is a powerful oxidant and is becoming popular in various aquaculture systems for disinfection and improving water quality by oxidation of inorganic and/or organic compounds. However, the use of ozone in marine-based aquaculture systems has been limited because of the potential to form bromate, which is formed during the oxidation of naturally occurring bromide by ozone. Because bromate is a human carcinogen, there are concerns with its chronic impact on fish health. In addition, the use of O3 is hindered by lack of quantitative as well as qualitative design and performance information on O3 for recirculating systems. This study investigated the application of ozonation to control pathogens and enhance the process water quality in a recirculating aquaculture system while minimizing bromate formation. A field scale monitoring program was conducted on process water quality from Atlantic halibut (Hippoglossus hippoglossus) recirculating systems. Ozonated modules showed reduction of 15% total organic carbon (TOC) and less than 25 μg/l bromate concentration was formed. In addition, ozonated modules showed reduction in nitrate, color and suspended solids, as compared to those that did not use ozone. The results of this study elucidates the formation of bromate in marine water recirculation systems.

Author Keywords: Ozonation; Marine recirculation systems; Atlantic halibut

Aquacultural Engineering
Volume 29, Issues 3-4, December 2003, Pages 125-137
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