IMO에서 규제중인 선박평형수의 처리기술은 현재 대부분 화학적 처리법 및 전기적인 처리방 법을 주로 이용하고 있는데 이러한 방법들은 2차오염의 위험을 가지고 있으며 이를 방지하기 위하여 추 가적인 장치가 필요하다. 본 연구에서는 전단력을 활용한 물리적인 방법을 이용하여 2차 오염 없이 선 박평형수를 처리하는 방법을 연구하였다. 균일장치의 원리를 이용하여 전단응력으로 균을 파쇄시키는 원 리인데, 내부 실린더와 외부 실린더의 표면이 매끄러운 경우에는 미끄럼 현상이 나타나 효율적인 살균 효과를 얻기가 어려워서 전단응력의 크기를 변화시키는 다양한 요인 가운데 표면의 모양을 다르게 하여 두 가지 type의 장치에 대한 살균 성능을 비교하였다. 기본 장치는 cylinder type이나, 내부 실린더와 외 부 실린더에 일정 간격과 깊이로 홈을 파낸 groove type과 멸균성능을 비교하였다. 그 결과 미끄럼을 방지한 groove type에서 cylinder type보다 우수한 결과를 나타내었다.

The purpose of this study is to treat the ballast water by shear stress without an environmental pollution and to find out the optimal treatment conditions. The ballast water problem is issued up as the trade activated and the cargos mobilized. To improve this problem, International Marine Organization(IMO) make the rule about the ballast water treatment with specific restrictions. Although many countries have been studying about the ballast water treatment technology, there is almost no technology that can treat the microorganisms under 50μm withoutany secondary pollution. In this study, we tried to treat ballast water by applying shear stress as the physical treatment for the sterilization and tried to find out the optimal conditions including the 100% sterilizing rate and the best economic condition.

The relative reactivities of branched and linear polycarbonates were investigated by measuring unreacted chloroformate concentration. It was found that the polymerization for the branched polymer proceeded ca. 10 times faster than that for the linear polymers. The effect of catalyst on a condensation step was studied by changing the amount of TEA (triethylamine) at t0 and t60 with keeping constant amount of TEA. The viscosity average molecular weight for the obtained branched polycarbonates were measured and compared with those of linear polycarbonates. It was found that the viscosity molecular weights of the obtained polymers decreased nonlinearly as wt % of added oligomer increased. The solution viscosities in methylenechloride for linear and branched polycarbonate increased nonlinearly as the content of polymer increased.