<p> The 14th International Symposium on Persistent Toxic Substances 24-28 September 2017, Nagoya University , Japan </p><p>Multi-scale evaluation of remediation technologies for contaminated sites Arata Katayama1,2, Yasushi Inoue2, Iwao Sakaguchi2,3 1 Institute of Materials and Systems for Sustainability, Nagoya University, Japan 2 EcoTopia Science Institute, Nagoya University, Japan 3 Arid Land Research Center, Tottori University, Japan</p><p>To facilitate decision making of stakeholders in selecting a remediation technology for a contaminated site, a comprehensive multiscale evaluation method is required to rank the applicable alternatives according to various factors such as risk reduction, cost, environmental impact, resource consumption and etc. We have proposed a two-scale evaluating concept based on risk rereduction and cost with trade-off relationship (Inoue & Katayama 2004). Decreasing the risk of contaminated site to the lower level by the wider decrease in concentration of toxic substances would result in the increase in the cost. When the two-scale index as shown by multiplication of the remaining risk after a technology applied and the spending cost shows the smallest, the technology is considered as the best one to be applied to the site. The quotient will also give us the cost efficiency to decrease the risk at the site by the selected technology. It is useful to have the concept evaluating the technology based on the multiple factors with trade-off relationship. Another important factor with trade-off relationship with risk reduction is the enegy spent for the remediation. The decrease in concentration of toxic substances to a lower level, in general, results in the larger spending of energy. The remediation spending a lot of ...... </p><p>...... These multi-scale evaluation should facilitate decision making in the selection of remediation technologies employed to reduce the risk of residents exposed to toxic substances.</p><p>References Inoue, Y. & Katayama, A. (2004) Application of the Rescue Number to the evaluation of remediation technologies for contaminated ground, Journal of Material Cycles and Waste Management, 6: 48-57.</p><p>Inoue, Y. & Katayama, A. (2011) Two-Scale Evaluation of Remediation Technologies for a Contaminated Site by Applying Life</p><p>Cycle Assessment: Risk–Cost, Risk–Energy Consumption and Risk–CO2 Emission, Journal of Hazardous Materials, 192, 1234- 1242.</p><p>Sakaguchi, I., Inoue, Y., Nakamura, S., Kojima, Y., Sasai, R., Sawada, K., Suzuki, K., Takenaka, C., & Katayama, A. (2015) Assessment of soil remediation technologies by comparing health risk reduction and potential impacts using unified index, Disability-Adjusted Life Years, Clean Technologies and Environmental Policy, 17, 1663-1670.</p>