Simultaneous Decomposition of 2,4-D in Biphasic Water-Sand System Using Ozone and H2O2

The application of herbicide is a common agricultural practice aimed at controlling weed growth; however, excessive use has led to significant soil contamination. Among these compounds, 2,4-dichlorophenoxyacetic acid (2,4-D) is widely used due to its effectiveness against a broad spectrum of weeds. This study investigates the simultaneous removal of 2,4-D from water and sand using ozonation (SO, simultaneous ozonation), both with and without hydrogen peroxide (H2O2), at two concentrations: 0.5% for the liquid phase and 0.018 wt/wt for sand (SO-R1), and 1.0% in the liquid phase and 0.036 wt/wt for sand (SO-R2). In the aqueous phase, total organic carbon (TOC) removal increased from 34.4% with ozone alone to approximately 48.7% with the addition of 0.5% H2O2 after 120 min. The result suggests that the O3-H2O2 process enhances the formation of reactive oxidant species, promoting greater mineralization. During simultaneous liquid-sand treatment (SO), TOC removal followed the trend: SO-R2 (70%) > SO-R1 (64.1%) > SO (59.7%) > individual treatment (37.4%). The SO-R2 system achieved approximately 10% higher TOC removal than the system without H2O2, likely due to enhanced H2O2 decomposition, which improved herbicide degradation. © 2025 International Ozone Association.

Simultaneous Decomposition of 2,4-D in Biphasic Water-Sand System Using Ozone and H2O2 Academic Article in Scopus