• Journal of Advanced Marine Engineering and Technology
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• v.32 no.8
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• pp.1123-1128
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• 2008

Marine facilities like buoy, lighthouse are operated with stand alone power supply system. This power system can consist of a stand-alone type power system such as PV(Photovoltaic) system, wave system or hybrid system which is not cooperated with a commercial power system. Generally, PV power system for marine facilities can not supply a sufficient power to buoy, because it is so influenced from weather condition. For solving this problem the hybrid power system with PV and wave is studied on a various area, that is why a hybrid power system is requires to overcome these problems. This paper will describe a generation characteristic of WEC(Wave Energy Converter) for buoy, and an AFS(Anti-Fouling System) influence on WEC.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.29 no.11 s.242
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• pp.1229-1238
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• 2005

The objective of the present study was to investigate the efficacy of physical water treatment (PWT) technologies using different catalytic materials and an electronic anti-fouling device in the mitigation of mineral fouling in a once-through flow system with mini-channel heat exchanger. Effects of flow velocity and water hardness on the effectiveness of PWT technologies were experimentally studied. The artificial water hardness varied from 5.0 to 10 mo1/m$^{3}$ as CaCO$_{3}$. For 10 mo1/m$^{3}$ solution, fouling resistance reduced by 13-40$\%$ depending on flow velocity and types of PWT devices. On the other hand, fouling resistance reduced by 21-29$\%$ depending on the PWT devices for 5 mo11m3 solutions. The PWT device using alloy of Cu and Zn as catalyst (CM2) was slightly more effective than the others. SEM photographs of scale produced from the 10 mol/m$^{3}$ solution at 1.0 m/s indicated that calcium carbonate scales without PWT devices were needle-shaped aragonite, which is sticky, dense and difficult to remove. Scales with the PWT devices showed a cluster of spherical or elliptic shape crystals. Both the heat transfer test results and SEM photographs strongly support the efficacy of PWT technologies using catalytic materials and an electronic anti-fouling device in the mitigation of mineral fouling.

• Environmental Engineering Research
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• v.21 no.1
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• pp.45-51
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• 2016

Membrane bioreactor (MBR) and reverse osmosis (RO) membrane system was applied to the treatment and reclamation of textile wastewater in Thailand. An experiment was carried out to determine the fouling behavior and effect of anti-scalant and biocide addition to flux decline and its recovery through chemical cleaning. The RO unit was operated for one month after which the fouled membranes were cleaned by sequential chemical cleaning method. RO flux was found rapidly declined during initial period and only slightly decreased further in long-term operation. The main foulants were organic compounds and thus sequential cleaning using alkaline solution followed by acid solution was found to be the most effective method. The provision of anti-scalant and biocide in feed-water could not prevent deposition of foulant on the membrane surface but helped improving the membrane cleaning efficiencies.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.5
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• pp.661-666
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• 2011

Recently, there are active research activities regarding to power systems of marine traffic facilities using a hybrid generation system which includes a photovoltaic generation system and a wave power generation system. However, when the marine traffic system is operated on a maritime environment for a substantial period of time, it was reported that the shellfish was adhered inside the water column. To tackle this problem, researches on the AFS (Anti-Fouling System) are on the progress. However, use of the single channel AFS resulted in frequent replacement of anode. Thus, the paper proposes a multi-channel method on AFS and experiments have been taken place correspondently. To improve the reliability of the experiment, the melting anode result was applied to our simulation program. The outcome of the simulation illustrates that the proposed multi-channel AFS's anode in the buoy have been ionized equally.

• Membrane Journal
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• v.26 no.1
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• pp.55-61
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• 2016

Organic fouling observed in submerged membrane filtration as a pretreatment for seawater desalination increases energy consumption for membrane operation because of requiring frequent chemical cleaning and membrane replacement. In membrane pretreatment for seawater facing with algae blooms, membrane fouling was observed in submerged microfiltration using sodium alginate model compound which is one of the main components of extracellular polymeric substances. Without aeration, aglinate fouling increased with its concentration while aeration reduced the alginate fouling effectively regardless of its concentration tested. In the absence of aeration, alingate fouling tended to be decreased with increasing calcium concentration. However, this effectiveness was reduced by increasing sodium chloride concentration. At high concentration of sodium chloride and calcium similar to the seawater conditions, aeration reduced initial fouling. However, as time progressed, the effect of increased airflow rate on fouling reduction was not significant, implying that optimum airflow rate to control alginate fouling in submerged microfiltration can exist.

• Korean Journal of Environmental Biology
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• v.37 no.3
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• pp.389-395
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• 2019

In this study, we aimed to assess the toxicity of biocide present in antifouling paint on embryos of sea urchin, Mesocentrotus nudus. Three types of biocide (Sea-nine 211, Diuron, and Irgarol 1051) were selected for the exposure experiment. The EC₅₀ of Sea-nine, Diuron, and Irgarol on the fertilization rate of sea urchin were 32.8 ㎍ L^-1, 7,975 ㎍ L^-1 and 6,995 ㎍ L^-1, respectively. The EC₅₀ of Sea-nine, Diuron, and Irgarol on the development rate of sea urchin were 31.6 ㎍ L^-1, 3,044 ㎍ L^-1, and 2,267 ㎍ L^-1, respectively. The highest toxicity was observed in the presence of Sea-nine.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.192-192
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• 2011

For the safety of vessels sailing Marine Transport Facility announces sea route, reefs or shallow water. Photovoltaic, independent power system, installation in the general Marine Transport Facilities to be used in the marine lantern. Due to install of communications, controls, power consumption inceases. And the weather of cloudy day or rainy, generation of electricity is decrease. Recently, power system of marine facility using a hybrid generation system, photovoltaic generation system and wave power generation system. But increase of adhered shellfish inside the water column, is the cause of the reduction of efficiency. So study was conducted to Single channel AFS(Anti-Fouling system). In this paper we offer the Multi channel AFS for Marine Transport Facility and have simulated. Improve the accuracy of the research, we using the result of anode, in the experiment were actually in the buoy, is based on simulation. The experimental results is shown every anode's, in the Marine Transport Facility, ionization was conducted identically.

• Journal of Korean Society of Water and Wastewater
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• v.24 no.2
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• pp.143-155
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• 2010

Fouling by inorganic scales needs to be prevented to effectively operate sea water reverse osmosis(SWRO) membrane systems. The extents of inorganic scaling with different array designs including one-pass, two-pass and several hybrid designs were evaluated using seawater from southern sea near the city of Chang-Won. The used methods for evaluation were Stiff and Davis Index(S&DSI) calculation and several laboratory experiments. The formation potential of inorganic scale fouling was quite great under the examined conditions, which was confirmed by the laboratory experimental results. The inorganic scale was not avoidable fouling if any anti-scaling measures were not applied. The RO showed decreased flux under the scale formation conditions. The increases in S&DSI from 1.43 to 5 made small decreases in flux, which indicated that formation of inorganic scales had more substantial effects on RO flux than amount of inorganic scales.

• Journal of Advanced Marine Engineering and Technology
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• v.39 no.9
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• pp.981-986
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• 2015

As the seriousness of global environment pollution is gaining increasing public attention, research into greenhouse gas emissions of ships is being carried out globally. At a domestic level, however, in a number of significant fields such research has not been conducted to date. This study examined countermeasures for the reduction of $CO_2$ emission in the fields of electronic control engines, trim optimization, propeller polishing, hull cleaning, and anti-fouling paint using an actual sea-going vessel. Selected countermeasures were applied during sea trials of the ship and the effect of specific fuel oil consumption analyzed. It was found that each countermeasure resulted in a decrease of fuel consumption of 1~5%. The energy efficiency operational indicator (EEOI) was calculated and found to also be improved by 1~5%. Further research into the EEOI of domestic shipping is planned to enhance conformance with international environmental regulations and improve global competitiveness.

• Journal of Korea Ship Safrty Technology Authority
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• s.34
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• pp.18-32
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• 2013

최근 선저 부착 생물에 관한 문제가 환경오염으로 확대되고 그에 따른 여러 가지의 선체 방오 방법 중 특히 주석(Sn)의 화합물질의 화학반응으로 따개비 등의 오염 요소를 방지하는 기존 방법이 수은, 구리 등의 유독성 화합물에 의해 임포섹스 유발과 그에 따른 2차 오염 확산의 요인이 되어 2012년 7월부터는 유기주석화합물(TBT) 도료를 사용한 신규 선박은 규제되는 등 그 심각성이 대두하고 있다. TBT는 매우 미량의 농도에서도 다양한 생물학적 저해영향을 일으키는 것이 알려져 이를 대체하기 위한 여러 화학물질이 개발됐다. 본 논문에서는 이러한 추세에 따라서, 유독성 화합물의 독성을 벗어나 저 전류의 고주파 고전압 펄스 에너지를 이용한 새로운 환경조성을 통해서 부착성 패류의 선저 부착에 대한 특성을 연구하였으며, 특히 환경오염 및 해양오염에 영향이 적은 방오시스템을 개발하고자 하였다. 또한 본 연구에서 적용된 고전압 펄스 시스템을 이용하여 선체의 부식정도를 저감 가능한 시스템을 구현을 위한 기초 실험과 현재 이슈화 되고 있는 선박평형수의 살균장치에 적용하는 파생연구들을 통하여 해양오염방지 요소들을 겨냥하여 후속연구를 위한 토대를 마련하고자 하였다.