Abstract
Adequate disaster waste management requires the determination of proper policies including (1) selection of equipment, facilities, and resources necessary for treatment, and (2) securing air space of utilization and/or landfill of treated or recovered materials. Further appropriate policies will possibly be determined if useful data exists regarding type of waste fractions before and after each treatment process, their quantities, and constitutive relations between them, which have never been studied before. In this study, comprehensive analyses were conducted to review the performance of the disaster treatment conducted for the recovery from 2011 East Japan earthquake, based on data of disaster waste treatment obtained in Yamada town and Kuji/Noda area in Iwate prefecture. The data used for these two towns were collected and compiled by a newly developed system implementing information and communication technology (ICT), in which all the necessary data (vehicle number, type of material, mass, date, transportation purpose, etc.) were automatically extracted when loaded vehicle was weighed before and after each treatment, and then integrated into a host computer. “Coefficient of separation” is defined in this study as an index of the relations between mass ratios of fractions before and after treatment. Reasonable values of “coefficients of separation” were obtained for larger-size and smaller-size waste mixtures before treatment, and for burnable fraction, unburnable fraction, recovered soil, and residue after treatment. In addition, change in the obtained coefficients were reasonably reflected by the change in treatment process with time. In conclusion, the obtained values of “coefficients of separation” are considered a useful index to be used in determining disaster waste treatment policy. Application of the proposed system with ICT is also considered effective not only to review the performance after treatment but also to implement an observational method during treatment.
