The frequency and impact of disasters have increased recently because of various reasons, including climate change, an increase in social complexity, and so on. Limited financial and manpower resources for disaster management impede ample countermeasures to mitigate various risks that trigger disasters, and this requires the identification of disasters with relatively high priority for effective and efficient disaster management. This study performs hazard risk assessment using a risk matrix for Busan Metropolitan City, indicating disasters with relatively high priority. The results suggest that infectious diseases, fine and yellow dust, storms and floods, atomic accidents, and earthquakes have relatively high priority. The results may be used as baseline data for establishing a disaster preparedness strategy and for developing future research. Standardization of the methodology for hazard risk assessment is also required to secure the efficiency of the data collection and the reliability of the assessment.

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This study is to predict the biogas production and the content analysis of the organic wastes of three islands located in the City of I. Content analysis for a total of six sections, including pH, BOD, COD, three components (Moisture, Ash, Combustibles)was conducted on the specimens of organic wastes from the representative spots of three islands. From the analysis result of organic waste, it is confirmed that more than 1,750,000㎥ of methane gas per year will be generated through the calculation of the total methane generation for the COD value. Therefore, if the incineration facility for the organic waste in island region is converted into a biogas production facilities which is non-incineration facility, it seems that the organic waste of efficient utilization is available.