Evaluation of Oxidation Processes for Treating Aqueous Chemical Mixtures
Abstract
The pathways of radical generation and consumption in several advanced oxidation processes (AOPs) involving ozone, peroxide, titanium dioxide, and UV light have been evaluated. HO is the principal oxidant in the AOPs at pH 7 and 2 as shown by measuring the relative reactivity ratio between butyrate and propionate ions. Several kinetic models have been developed to describe these oxidation processes in pure water and in a variety of natural waters. Both models and experiments show the importance of HCO3 and humic acid in controlling the steady state of HO. Good agreement between data from experiments and kinetic models shows that the models predict the changes in concentration of hydrogen peroxide, ozone and butyrate ion reasonably well. The models can be used to optimize the efficiency of AOPs. A preliminary study of the electrooxidation of organics in water was conducted using PbO2/Pt electrode. Rates of oxidation were relatively slow and the relative reactivity ratio for propionate and butyrate ions was close to one indicating a diffusion controlled process in which the organic was oxidized directly on the electrode. AOPs, Kinetic models, Optimization, Efficiency, Electrooxidation, HO radical, Oxidation, Ozone, Hydrogen peroxide, Butyrate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1994
- Accession Number
- ADA283324
Entities
People
- C. C. Yao
- Her-king Song
- Stuart Smedley
- Theodore Mill
Organizations
- SRI International