Work

Understanding the impacts of oxidant doses and dissolved organic carbon concentration on ozone and hydroxyl radical exposures in the peroxone process

Year: 2024

Type: article

Abstract: This research investigates the effects of ozone (O3) and hydrogen peroxide (H2O2) doses, as well as the dissolved organic carbon (DOC) concentration, on O3 and hydroxyl radical (•OH) exposures (i.e., ∫[O3]dt and ∫[•OH]dt) during the peroxone (O3/H2O2) process. The addition of H2O2 during the ozonation process accelerated the O3 decomposition into •OH, increasing ∫[•OH]dt while decreasing ∫[O3]dt. The optimal [H2O2]/[O3] input ratio for maximizing ∫[•OH]dt was found to be around 0.2; at higher ratios, additional H2O2 consumption did not further increase ∫[•OH]dt. At higher DOC concentrations, both oxidant exposures decreased, and the effect of H2O2 on ∫[•OH]dt was diminished due to competitive reactions between H2O2 and DOC for O3, as well as scavenging of •OH by DOC. An increase in ∫[•OH]dt in the peroxone process exhibited a linear correlation with the [O3]/[DOC] ratio when the [H2O2]/[O3] input ratio was fixed at 0.2.

Source: Environmental Engineering Research

DOI: 10.4491/eer.2024.521

Authors: Jaehan Choi, Dongwon Cha, Junho Cho, Hye-Jin Lee, Changha Lee

Institutions: Seoul National University, Institute of Engineering Research, Korea Water Resources Corporation (South Korea)

Language: English

Topic: Advanced oxidation water treatment

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

Open Access status: diamond

Funders: National Research Foundation, National Research Foundation of Korea, Ministry of Science and ICT, South Korea, Korea Environmental Industry and Technology Institute

Awards: G484029108, G7181757860