title: Organic pollutants removal from 2,4,6-trinitrotoluene (TNT) red water using low cost activated coke.
abstract: We treated 2,4,6-trinitrotoluene (TNT) red water from the Chinese explosive industry with activated coke (AC) from lignite. Since the composition of TNT red water was very complicated, chemical oxygen demand (COD) was used as the index for evaluating treatment efficiency. This study focused on sorption kinetics and equilibrium sorption isotherms of AC for the removal of COD from TNT red water, and the changes of water quality before and after adsorption were evaluated using high performance liquid chromatography, UV-Vis spectra and gas chromatography/mass spectroscopy. The results showed that the sorption kinetics of COD removal from TNT red water onto AC fitted well with the pseudo second-order model. The adsorption process was an exothermic and physical process. The sorption isotherm was in good agreement with Redlich-Peterson isotherm. At the conditions of initial pH = 6.28, 20 degrees C and 3 hr of agitation, under 160 g/L AC, 64.8% of COD was removed. The removal efficiencies of 2,4-dinitrotoluene-3-sulfonate (2,4-DNT-3-SO3-) and 2,4-dinitrotoluene-5-sulfonate (2,4-DNT-5-SO3-) were 80.5% and 84.3%, respectively. After adsorption, the acute toxicity of TNT red water reduced greatly, compared with that of unprocessed TNT red water.
authors.affiliation: Key Laboratory for Urban Habitat Environmental Science and Technology, School of Envimronment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China. zhangmohe@iee.pku.edu.cn
authors.forename: Mohe
authors.initials: M
authors.lastname: Zhang
authors.forename: Quanlin
authors.initials: Q
authors.lastname: Zhao
authors.forename: Zhengfang
authors.initials: Z
authors.lastname: Ye
mesh_terms: D000327:Adsorption; D057919:Biological Oxygen Demand Analysis / Q000379:methods*; D003077:Coke; D008401:Gas Chromatography-Mass Spectrometry; D007700:Kinetics; D013056:Spectrophotometry, Ultraviolet; D014303:Trinitrotoluene / Q000737:chemistry / Q000302:isolation & purification* / Q000633:toxicity; D014865:Waste Disposal, Fluid / Q000191:economics / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification* / Q000633:toxicity
chemical_list: D003077:Coke; D014874:Water Pollutants, Chemical; D014303:Trinitrotoluene