COMPARATIVE ANALYSIS OF GENERATION AND MANAGEMENT OF DISASTER WASTE FROM THE GREAT EAST JAPAN EARTHQUAKE

Abstract

 The Great East Japan Earthquake generated a huge amount of disaster waste along coastal municipalities especially in Iwate and Miyagi Prefecture. To investigate the reason for the revisions of the estimated amount of disaster wastes, we referred to the disaster waste management plan of these prefectures, to characterize changes of the amount in each prefecture. In addition, we applied regression analysis where we adopted damage level indicators, such as flooded land area, as explanatory variables. As a result, we found a correlation between flooded built-up area and amount of disaster waste, and the basic unit of disaster waste in flooded land area was 34.2 thousand ton per 1 square kilometer. Using waste flow data in the disaster waste management plan of Miyagi prefecture, we made material flow analysis between before and after intermediate treatment, and investigated the relationship between the amount and composition of waste generation and throughput. The amount of waste generation is estimated at tentative stockyard where there are a lot of mixed wastes, while throughput is estimated where wastes are ready for final disposal or recycling. As a result, the ratio of combustible and non-combustible differs before and after the treatment.