模擬管路試験法による次亜塩素酸ナトリウム溶液と海水電解液との防汚効果の比較

抄録

In our previous study, we made a portable apparatus simulating a seawater cooling intake water pipe and confirmed its effectiveness assessing the antifouling effects of chemical agents on sessile organisms. In this study, we used the apparatus to see if the use of different chlorine sources (sodium hypochlorite solution and seawater electrolyte) could lead to a gap in these antifouling effects. The authors conducted a 25-day seawater flow-through experiment using seawater electrolyte as a chlorine source between 28 November and 22 December 2014. The nominal total residual chlorine concentration levels were 0 (control), 0.04, 0.08, and 0.16 mg/L as a factor. At the end of the experiment, the total number and weight of sessile organisms at the result of the experiment were compared with the result of the previous experiment that used sodium hypochlorite solution as a chlorine source. When comparing the results of the two, we learned that the residual chlorine concentration levels, which affect the number and weight of attached barnacles, hydrozoa, and biofilms, were not significantly different despite a difference in chlorine sources, and that the antifouling effects of both chlorine sources are considered to be almost same.