碱性水解法在修复三硝基甲苯污染水体中的适用性。

Applicability of alkaline hydrolysis for remediation of TNT-contaminated water.

作者信息

Hwang Sangchul, Ruff Timothy J, Bouwer Edward J, Larson Steven L, Davis Jeffrey L

机构信息

Department of Civil Engineering and Surveying, University of Puerto Rico at Mayagüez, PR 00680, USA.

出版信息

Water Res. 2005 Nov;39(18):4503-11. doi: 10.1016/j.watres.2005.09.008. Epub 2005 Oct 19.

DOI:10.1016/j.watres.2005.09.008

PMID:16236339

Abstract

This study was conducted to assess the applicability of alkaline hydrolysis as an alternative ex situ technology for remediating 2,4,6-trinitrotoluene (TNT)-contaminated water. TNT reactivity had a strong dependence on the reaction pH (11-12) and initial TNT (5-25 mg L(-1)) in batch systems, resulting in pseudo first-order transformation rate, k ranging between 1.9 x 10(-3) and 9.3 x 10(-5) min(-1). In continuous flow stirred-tank reactor (CFSTR) systems with initial TNT of 1 mg L(-1), the highest 74% of TNT reduction was achieved at the reaction pH of 11.9 and 2-day hydraulic retention time under steady-state condition. Oxalate was produced as the major hydrolysate in the CFSTRs, indicating a ring cleavage during alkaline hydrolysis. It was also believed that TNT alkaline hydrolysis occurred through the production of color-forming intermediates via dimerization. It is concluded that alkaline hydrolysis can be an alternative treatment technology for remediation of TNT-contaminated water.

摘要

本研究旨在评估碱性水解作为一种替代异位技术修复2,4,6-三硝基甲苯（TNT）污染水体的适用性。在间歇系统中，TNT的反应活性强烈依赖于反应pH值（11 - 12）和初始TNT浓度（5 - 25 mg L⁻¹），导致假一级转化速率k在1.9×10⁻³至9.3×10⁻⁵ min⁻¹之间。在初始TNT为1 mg L⁻¹的连续流搅拌釜式反应器（CFSTR）系统中，在稳态条件下，反应pH值为11.9且水力停留时间为2天时，TNT的最高去除率达到74%。草酸盐是CFSTRs中产生的主要水解产物，表明碱性水解过程中发生了环裂解。还认为TNT碱性水解是通过二聚作用产生显色中间体而发生的。结论是碱性水解可作为修复TNT污染水体的一种替代处理技术。