Comparing UV AOP and Ozone AOP
- Erik J. Rosenfeldt - Hazen and Sawyer
- Karl G. Linden - Department of Civil and Environmental Engineering, Duke University
- Silvio Canonicaa, Urs von Guntena - Swiss Federal Institute of Aquatic Science and Technology
Comparison of advanced oxidation processes (AOPs) can be difficult due to physical and chemical differences in the fundamental processes used to produce dOH radicals. This study compares the ability of several AOPs, including ozone, ozone+H2O2, low pressure UV (LP)+H2O2, and medium pressure UV (MP)+H2O2 in terms of energy required to produce dOH radicals. Bench scale dOH radical formation data was generated for each AOP using parachlorobenzoic acid (pCBA) as an dOH radical probe compound in three waters, Lake Greifensee water, Lake Zurich water, and a simulated groundwater.
Ozone-based AOPs were found to be more energy efficient than the UV/H2O2 process at all H2O2 levels, and the addition of H2O2 in equimolar concentration resulted in 35% greater energy consumption over the ozone only process. Interestingly, the relatively high UV/AOP operational costs were due almost exclusively to the cost of hydrogen peroxide while the UV portion of the UV/AOP process typically accounted for less than 10 percent of the UV/AOP cost and was always less than the ozone energy cost. As the dOH radical exposure increased, the energy gap between UV/H2O2 AOP and ozone processes decreased, becoming negligible in some water quality scenarios.
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