PM02 Remediation Techniques and Strategies
Exhibit Hall
8:00 AM - Monday
(PM014) Development of evaluation method for remediation technologies to contaminated ground based on the Rescue Number.
Inoue, Y.1, Katayama, A.1, 2, 1 Department of Civil Eng., Naogya University, Nagoya, Japan2 EcoTopia Science Institute, Naogya University, Nagoya, Japan
ABSTRACT- An improved Rescue Number, RNSOIL, which is an indicator for evaluating remediation technologies for contaminated ground that is based on both the risk and the cost, is proposed as a tool of risk communication for the selection of technology. The risk posed by contaminant is expressed by the Figure of Treatment Priority at time t, FTP(t), which represents the human health risk as the number of people affected by the contaminant at time t. The calculation of the value of FTP(t) is based on exposure to contaminants that have migrated from the contaminated ground, and which is estimated by using a CalTOX model and the Monte Carlo Method. The integration of FTP(t) with time, which represents the cumulative number of people affected by the contaminated ground, is used to estimate the performance of individual remediation technologies in risk reduction. FUW (Figure of Unprocessibility for Waste), which represents difficulties in remediation, is expressed as the total of remediation cost, soil function recovery cost and benefit drop due to the restriction of activities. FUW is estimated by using actual remediation costs and actual performance after remediation. As an overall performance value, the Rescue Number for each remediation technology to contaminated ground (RNSOIL) is calculated by multiplication of the integral FTP(t) by FUW. Smaller values of RNSOIL are judged to indicate a better technology. The Rescue index (RI), calculated as the ratio of the reduction of the integral FTP(t) to FUW, indicates the cost-effectiveness of the remediation technologies. Taking the remediation of contaminated ground with organic solvent or petroleum compound in urban area and with POPs in the farmland as typical examples, successful estimation of the indices (FTP(t), integral FTP(t), FUW, RNSOIL and RI) demonstrate the usefulness of these indices in the selection of technology.
Key words: remediation techology, contaminated site, risk-economic evaluation index, risk communication