Pilot-Scale Evaluation of Ozone vs. Peroxone for Trihalomethane Formation

Evaluation and Comparison of Conventional and Advanced Oxidation Processes for the Removal of PPCPs and EDCs and Their Effect on THM-Formation Potentials

“…These results are in agreement with the findings in the literature (Irabelli et al 2008) that reported 45% reduction of DOC using a pre-ozonation peroxone system. These findings were much higher than the current study and likely due to different experimental conditions.…”

“…These results were comparable to experiments conducted in the literature (Irabelli et al 2008), which reported that THM-FPs by ozone/H 2 O 2 + conventional treatment samples were 45% to 85% lower than that by conventional treatment. The amount of THM-FP reduction (Irabelli et al 2008) was higher than that of the current study that may be possibly due to different experimental conditions such as quality of raw water, ozone, H 2 O 2 , and/or chlorine dosages. Ozone satisfies a part of chlorine demand and changes the Oxidation Processes for Removal of PPCPs and EDCs…”

“…The ratio was decided based on the results of Irabelli et al (2008) that reported the lowest THMs formation when the ratio of H 2 O 2 /ozone was 0.1. For UV/H 2 O 2 treatment, 5 mg/L of H 2 O 2 were used with three different UV dosages.…”

Impact of Ozone and Hydrogen Peroxide vs. UV and Hydrogen Peroxide on Chlorine Residual

“…The application of ozone with hydrogen peroxide and UV and hydrogen peroxide are used to achieve many targets such as disinfection, THMs control, and/or taste and odor control (Irabelli et al, 2008;Sarathy and Mohseni, 2009). Chlorine addition to effluent water samples for both trains was conducted in the laboratory in order to have controlled conditions.…”

“…Ozone dosage was 2.00 mg/L, and H 2 O 2 dosage applied was 0.2 mg/L at a 0.1 H 2 O 2 /ozone ratio. Previous studies indicated that higher H 2 O 2 to O 3 ratios have been reported to increase THMs formation potential (Irabelli et al, 2008). Calcium thiosulfate was injected with a metering pump to quench any excess of ozone to prevent it from being released to the atmosphere.…”