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A Study on the Removal of TNT(2,4,6-trinitrotoluene) using Marsh and Pond Type Microcosm Wetland Systems  

Choi, Jong-Kyu (Institute of Health & Environment, Seoul National University)
Kim, Se-Kyung (Institute of Health & Environment, Seoul National University)
Kang, Ho-Jeong (Department of Environmental Engineering, Ewha Womans University)
Zoh, Kyung-Duk (Institute of Health & Environment, Seoul National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.2, 2005 , pp. 198-205 More about this Journal
Abstract
This study was carried out to investigate the removal of TNT (2,4,6-trinitrotoluene) in the batch and continuous type microcosm systems consisting of marsh and pond. First, the batch reactor study showed that TNT (10 mg/L) was completely removed in the marsh and pond system within 20 days. The major reductive metabolites of TNT include 4-amino-2,6-dinitrotoluene (4-ADNT), 2-amino-4,6-dinitrotoluene (2-ADNT), 2,4-diamino-6-nitrotoluene (2,4-DANT), and 2,6-diamino-4-nitrotoluene (2,6-DANT). These metabolites concentration also decreased during further treatment. The continuous reactor systems combining marsh and pond indicated the similar pattern of TNT degadation and the metabolites production. Among the continuous reactor combinations, marsh-pond system showed more stable TNT removal and metabolites production. The toxicity of the effluent from the continuous system was examined by Microtox Assay using Vibrio fischeri. The result showed that the effluent toxicity was reduced below toxicity endpoint ($EC_{50}$) after continuous marsh pond system, indicating that metabolites of TNT are less toxic than TNT itself. Based on the results, TNT contaminated wastewater can be efficiently treated using marsh and pond wetland systems.
Keywords
TNT (2,4,6-trinitrotolune); Marsh; Pond; Microcosm; Microtox Test;
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