ENVIRONMENTAL ASSESSMENT OF SOLIDIFIED/STABILIZED MARINE SEDIMENTS USING ROTIFERS

Abstract

The management of polluted marine sediments is a recent critical issue. Particularly, dredged sediments removed from in-situ site for pollution remediation have recieve great concern because of further treatments (waste and landfill). Thus, various studies are being conducted on developing remediation technology. Solidification/stablization have been considered as one of method for treating dredged contaminated sediment for reuses. However, a little studies have been conducted on the environmental effects of these treatment on human as well as marine ecosystem. In this study, we compared standard toxicity characteristic leaching procedures (TCLP, USEPA) and bioassay (Rotifer Brachionus rotundiformis, acute test) to evaluate environmental safety of dredged sediments after treating three different agents consisting of CaO, SiOw, and Al2O3, repectievly. Dredged sediments were collected from Masan bay (Korea) where adjacent to industrial complex and sewage disposal plant. We also found that metal concentrations of this area are higher than the proposed guidelines for remediation in Korea (clean-up index of harful chemicals, CIHC). After treating with solid/stabilization agents (for 28 days), leacheable metal contents were significantly decreased in most elements even up to 99% (Ni, Zn, Cd, Pb) except for Cr (TCLP method, USEPA). In bioassay using rotifer, however, seawater elutriates of sediment (treated with agent O various studies are being conducted on developing remediation technology. Solidification/stablization have been considered as one of method for treating dredged contaminated sediment for reuses. However, a little studies have been conducted on the environmental effects of these treatment on human as well as marine ecosystem. In this study, we compared standard toxicity characteristic leaching procedures (TCLP, USEPA) and bioassay (Rotifer Brachionus rotundiformis, acute test) to evaluate environmental safety of dredged sediments after treating three different agents consisting of CaO, SiOw, and Al2O3, repectievly. Dredged sediments were collected from Masan bay (Korea) where adjacent to industrial complex and sewage disposal plant. We also found that metal concentrations of this area are higher than the proposed guidelines for remediation in Korea (clean-up index of harful chemicals, CIHC). After treating with solid/stabilization agents (for 28 days), leacheable metal contents were significantly decreased in most elements even up to 99% (Ni, Zn, Cd, Pb) except for Cr (TCLP method, USEPA). In bioassay using rotifer, however, seawater elutriates of sediment (treated with agent O