차세대 연속자기역세형메디아필터개발을 위한 설계 인자의 구현

Abstract

While there have been growing interests in protecting marine environments, with the damages to the marine ecosystems by mixing exotic organisms through ballast water, cost due to damages has been estimated to be over 1 billion dollars yearly. Maritime Environment Protection Committee(MEPC) of International Marine Organization(IMO) has reached an international agreement, and in the effective period of 2009 through 2016, installation of ballast water disposal device will be mandatory for each of 30000 vessels worldwide. Its international market size Korea is projected to be approximately over 500 billion won. Korea is not possible to be outside of influence of this new international agreement, since 99% of our foreign goods are transported by vessels. Therefore, if we don't invest in marine technology at an early stage, there will be an accelerated dependency on imported technologies. In the ballast disposal system, the filtering process has to process over 500M/T, which is a large amount, of organisms if over 10㎛ in size, every hour. Since the system needs be installed on a vessel taking minimal amount of space, development of a feasible disposal system is guite challenging. A research on next-generation media filter was done to overcome the constraint in this study. In order to find out the relevent factors of vaccume filtration, for each media type, pressure due to filtration layer was found, and flux measurement experiment was done. Also, after vaccume filtration, and experiment was done to monitor the changes in turbidity and granularity of the purified water, in order to present the best operative direction of the media filter. Media used in the test in sand, diatomaceous earth, anthracite and coke. The results of this study showed that, after conducting experiments considering all the relevent factors involved, the best configuration of the media which is part of ballast water disposal is vaccume filtration using 8㎜ of sand layer allowing size of 150㎛.