Degradation of atrazine by modified stepwise-Fenton's processes

被引：60

作者：

Chu, W. ^{[1
]}

Chan, K. H. ^{[1
]}

Kwan, C. Y. ^{[1
]}

Choi, K. Y. ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Res Ctr Environm Technol & Management, Kowloon, Hong Kong, Peoples R China

来源：

CHEMOSPHERE | 2007年 / 67卷 / 04期

关键词：

atrazine; Fenton; H2O2; kinetic model; stepwise dosage;

D O I：

10.1016/j.chemosphere.2006.10.039

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The removal of atrazine (ATZ) by stepwise Fenton's processes (stepwise-FP) was studied and the system models were developed through the examination of reaction kinetics. The study compared the performance of the removal of ATZ by conventional FP with stepwise-FP, where the total dose of H2O2 was split and inputted into the system at different times and/or quantities. The performance of stepwise-FP was found to be better than that of conventional FP. This was probably due to the minimization of the peak concentration of H2O2 in the solution, which reduced the probability that valuable H2O2 and hydroxyl radicals would be consumed in forming weaker radicals. The reaction kinetics of the decay of ATZ in stepwise-FP was found to be a two-stage process; and in each stage, fast decay followed by stagnant decay was observed. Two characterized constants (the initial decay rate and the oxidative capacity) were introduced and were found to be useful in quantifying the stepwise-FP. The models for predicting stepwise-FP with respect to different dosing times and/or asymmetrical doses were developed, and were found to be very useful for evaluating the system performance and/or for process design. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：755 / 761

页数：7

共 13 条

[1] DEGRADATION OF ATRAZINE BY FENTONS REAGENT - CONDITION OPTIMIZATION AND PRODUCT QUANTIFICATION [J].