부산대학교 도서관

Ion exchange membrane bioreactor has attracted growing interest in the area of academic and industrial due to its many advantages, easy operation control and including energy consumption. Many researchers were investigated that the ion-exchange membrane bioreactors with ion exchange membrane for water and wastewater treatment. However, established ion exchange membrane bioreactor has some problems such as nitrate accumulation. To overcome the nitrate accumulation in aerobic chamber, the three chambers system was applied. The three chambers system leads to increase the operation cost. The main concepts of ion exchange membrane bioreactor are an isolation of microorganisms between chambers and ion transport to the other side. If you installed charged porous membrane, the nitrate accumulation in an aerobic chamber will not be occurred. The first and second chapter aim to review previous approaches to the membrane modification methods and the application of membrane bioreactor using ion exchange membrane. The previous studies were mainly investigated that the target material removal. Therefore, they used commercial ion exchange membrane without any considerations of membrane properties. It makes limitations to the ion exchange membrane bioreactor. In addition, this paper provides a comprehensive understanding of where research currently stands with regards to the membrane modification methods for an ion exchange membrane bioreactor and what challenges remain in the pursuit of a standardization of methodologies. In third chapter, the porous membrane was modified by radiation induced grafting polymerization for novel membrane bioreactor. To determine the optimal modification condition, the various experiments were performed. Various monomer concentration and irradiation dose were evaluated for modification of membrane. The optimal condition of membrane modification was systematically determined. It is clearly demonstrated that as monomer concentration and irradiation dose increased, the grafting degree also increased. Ion exchange capacities (IECs) of unmodified PVDF membrane, modified PVDF membrane and commercial cation exchange membrane (CEM) were investigated. In batch ion transport test, the modified membrane shows higher ion transport rate than the CEM. Based on these results, the modified membrane can be used as an ion exchange membrane in the ion exchange membrane bioreactor system.In fourth chapter, the performance of sulfonated membrane bounded system was evaluated using synthetic wastewater. The anion in the sulfonated membrane bounded system easily moved by low permselectivity and large pore from chamber A to B. In addition, the produced nitrate in chamber B could be removed by denitrification in chamber A. The mass flux of ammonia and nitrate ion in nitrification and denitrification were higher than that of nitrification only. The mass flux of ammonia is lower than that of mass flux of nitrate in the sulfonated membrane bounded system. Therefore, the ammonia is the rate limiting factor. In the sulfonated bounded system, the high COD and T-N removal were achieved. Lastly, sulfonated membrane bounded system applied to the livestock wastewater treatment. To determine the effect of initial ammonium concentration, various concentration of ammonium was conducted. The ammonium mass flux and dialysis coefficient were influenced by initial concentration of ammonium. The theoretical flux was higher than the experimental flux. However, the theoretical flux was approached to the experimental flux with increasing time. The COD removal efficiency was decreased with increasing operation time. The similar trend was observed on the T-N removal. This result attributed to the membrane fouling. Livestock wastewater has refractory organic matter such as particulate proteins and lipids. These matters make severe membrane fouling. Therefore, the periodical membrane cleaning should be performed at every 50 days. The overall results provide useful consideration for the technical development of ion exchange membrane bioreactor.