INITIAL HEALTH AND ECOLOGICAL RISK ASSESSMENT OF CHEMICALS IN TREATED WASTEWATER IN OKINAWA PREFECTURE BASED ON JAPANESE PRTR SYSTEM

Abstract

 Initial health and ecological risk assessments of chemicals in treated wastewater in Okinawa Prefecture, Japan under the Japanese Pollutant Release and Transfer Register (PRTR) system were carried out. In the initial health risk assessment, the intake of root vegetables cultured using treated wastewater, the exposure to sprinkle of treated wastewater and so on were assumed. Direct exposure of aquatic organisms to treated wastewater was assumed in the initial ecological risk assessment. As a result, polyoxyethylene alkyl ether may cause health risk in case of the intake of the root vegetables. No chemical seemed to have a bad effect on human health in case of the sprinkle of treated wastewater and so on. In the initial ecological risk assessment, it was suggested that a detail survey like the measurement of the concentration of eight kinds of chemicals in treated wastewater such as hydrazine be conducted.