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Degradation of atrazine by modified stepwise-Fenton's processes
1Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong. cewchu@poly.edu.hk
Chemosphere
|December 5, 2006
Summary
Stepwise Fenton
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
Background:
- Atrazine (ATZ) is a persistent herbicide contaminating water sources.
- Conventional Fenton's process (FP) has limitations in pollutant degradation efficiency.
Purpose of the Study:
- To investigate the efficacy of stepwise Fenton's process (stepwise-FP) for atrazine removal.
- To develop kinetic models for predicting stepwise-FP performance.
- To compare stepwise-FP with conventional FP for atrazine degradation.
Main Methods:
- Investigated atrazine removal using stepwise-FP with controlled H(2)O(2) dosing.
- Analyzed reaction kinetics to understand degradation pathways.
- Developed predictive models based on dosing strategies and reaction constants.
Main Results:
- Stepwise-FP demonstrated superior atrazine removal compared to conventional FP.
- Minimized peak H(2)O(2) concentrations in stepwise-FP reduced radical scavenging.
- Atrazine decay followed a two-stage process (fast then stagnant) in stepwise-FP.
- Introduced initial decay rate and oxidative capacity constants for process quantification.
Conclusions:
- Stepwise-FP is an effective method for enhancing atrazine removal efficiency.
- Developed kinetic models provide valuable tools for process design and performance evaluation.
- Optimized H(2)O(2) dosing strategies are crucial for maximizing Fenton's process effectiveness.
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