전기화학적 처리장치에 의한 유화된 선저폐수의 처리에 관한 연구

A study on treatment of emulsified oil waste water in vessels by electrochemical treatment system

본 연구에서는 선저폐수 중에 유화된 상태의 유분이 존재할 경우엔 기존의 유처리 분리장치에 의해 선박의 배출허용기준치를 만족하는데 어려움이 있는 것을 감안하여 기존의 유처리 분리시스템에 전기화학적 처리장치를 추가하는 방안을 검토하고자한다. 이를 위해 실험실 규모의 전기화학적 처리장치를 설계ㆍ제작하여 각종 변수인 수력학적 체류시간, 전류밀도, 양극과 음극간의 간격 등을 변화시키며 유화유 폐수중의 유분 제거성능실험을 실시하였으며, 유화된 선저폐수 중의 유분 제거성능실험을 수행하였다. 본 실험결과 전기화학적 처리장치에 의해 유화유 폐수를 효과적으로 처리할 수 있는 가능성을 확인할 수 있었다.

Discharging untreated bilge to the ocean is a cause of marine pollution. In general, bilge water contains free and/or emulsified forms of oil. Free form of oil can easily be separated by gravimetric flotation and/or proper filtration processes. However, those simple physicochemical processes could not separate emulsified oil without adding proper chemicals. Electrolytic flotation is one of promising technologies able to fulfill the effluent standard requirement, which is below 15 ppm of oil content. In this research, Electrochemical process consisting of electrochemical flotation basin was studied for the treatment of emulsified oil. In order to estimate, the effectiveness of oil separation equipment influent concentration of oil and HRT(Hydraulic retention time) were considered. Also, lab-scale electrochemical process was designed and operated in the condition of various HRT, current density, and electrode gap. Through the research, following results were obtained. From the experiment of bench scale electrochemical treatment process, it was demonstrated that the emulsified oil was treated effectively and the removal efficiency of emulsified oil from wastewater was increased with HRT and current density.