LIUJian,CHENShao-hua,LOUYao-yin,et al.Unveiling Removal Mechanism of Dissolved Organic Matter Molecules by Activated Carbon/Ozone Synergistic System[J].China Water & Wastewater,2025,41(19):46-52.
Unveiling Removal Mechanism of Dissolved Organic Matter Molecules by Activated Carbon/Ozone Synergistic System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第19期
Page:
46-52
Column:
Date of publication:
2025-10-01
- Keywords:
- landfill leachate; dissolved organic matter; AC/O3; molecular characteristics; Fourier transformation-ion cyclotron resonance mass spectrometry (FT-ICR MS)
- Abstract:
- To elucidate the molecular degradation mechanism of dissolved organic matter (DOM) in membrane bioreactor (MBR) effluent from landfill leachate by the activated carbon/ozone (AC/O3) synergistic system, Fourier transformation-ion cyclotron resonance mass spectrometry (FT-ICR MS) was employed to analyze the differences in molecular reactivity among the single AC adsorption, single O3 oxidation, and AC/O3 synergistic systems. Experimental results demonstrated that under optimized conditions (pH 7.7, 50 ℃, O3/COD=2), the removal efficiencies of UV254 and DOC reached 86.9% and 61.7%, respectively, representing a significant improvements compared to the single AC adsorption and single O3 oxidation system. The mass spectrometry analysis results indicated that the AC/O3 synergistic system not only enhanced the degradation of highly oxygenated highly unsaturated and phenolic compounds (HOHUPC), which were difficult to be removed by single AC system and single ozone system. Meanwhile, AC/O3 synergistic system could effectively inhibit the generation of intermediate products of the ozonation process. The AC characterization results showed that the mesopore volume of AC decreased by 73.2% and the defect density (ID/IG value) decreased by 19.4% after the fifth recycling, resulting in the DOC removal rate dropping to the level of ozone treatment alone at the fifth cycle. This study reveals the mechanism of adsorption-catalysis synergism and provides an important theoretical basis for optimizing the AC/O3 synergistic catalytic system.
Last Update:
2025-10-01