An Ultrasound–Fenton Process for the Degradation of 2,4,6-Trinitrotoluene

Yangang Li, Wenzhen Zhang, Kelei Mu, Shangkun Li, Jiawei Wang, Shujun Zhang () and Lu Wang ()
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Yangang Li: Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing 100044, China
Wenzhen Zhang: Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing 100044, China
Kelei Mu: Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing 100044, China
Shangkun Li: Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing 100044, China
Jiawei Wang: Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing 100044, China
Shujun Zhang: Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing 100044, China
Lu Wang: Laoshan Laboratory, Qingdao 266237, China

IJERPH, 2023, vol. 20, issue 4, 1-14

Abstract: 2,4,6-Trinitrotoluene (TNT), one of the main compounds in ammunition wastewater, is harmful to the environment. In this study, the treatment efficiency of 2,4,6-TNT by different treatment processes, including ferrous ion (Fe 2+ ), hydrogen peroxide (H 2 O 2 ), Fenton, ultrasound (US) irradiation, US + Fe 2+ , US + H 2 O 2 and US–Fenton process, was compared. The results showed that US–Fenton was the most effective among all methods studied. The effects of initial pH, reaction time and H 2 O 2 to Fe 2+ molar ratio were investigated. The results showed that the removal of TNT, TOC and COD was maximum at an initial pH of 3.0 and H 2 O 2 to Fe 2+ molar ratio of 10:1. TNT, TOC and COD removal was fast in the first 30 min, reaching 83%, 57% and 50%, then increased gradually to 99%, 67% and 87% until 300 min, respectively. Semi-batch mode operation increased the removal of TNT and TOC by approximately 5% and 10% at 60 min, respectively. The average carbon oxidation number (ACON) was increased from −1.7 at 30 min to a steady-state value of 0.4, indicating the mineralization of TNT. Based on GC-MS analysis, 1,3,5-trinitrobenzene, 2,4,6-trinitrobenzene acid, 3,5-dinitrobenznamine and 3,5-dinitro-p-toluidine were the major byproducts from the US–Fenton process. The TNT degradation pathway was proposed, which involved methyl group oxidation, decarboxylation, aromatic ring cleavage and hydrolysis.

Keywords: 2,4,6-TNT; ultrasound-Fenton (US–Fenton) processes; removal efficiency; TNT degradation pathway (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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