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Molecular-level comparison study on microwave irradiation-activated persulfate and hydrogen peroxide processes for the treatment of refractory organics in mature landfill leachate.
- Source :
-
Journal of Hazardous Materials . Oct2020, Vol. 397, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- • Refractory organics are degraded by the synergistic effects of MW with PS and H 2 O 2. • The MW/PS process degrades organics better than the MW/H 2 O 2 process. • Differences in DOM degradation mechanisms were revealed at the molecular level. • Humus is better degraded in the MW/PS process due to the major contribution of SO 4 -. This study investigated the degradation of organics in mature leachate treated by microwave radiation-activated persulfate (MW/PS) and hydrogen peroxide (MW/H 2 O 2) processes. Obvious synergistic effects existed in both the MW/PS and MW/H 2 O 2 processes, but were significantly higher in the MW/PS process. Refractory organics were better degraded by the MW/PS process than the MW/H 2 O 2 process due to the major contribution of SO 4 –. Moreover, according to Fourier transform-ion cyclotron resonance mass spectrometry coupled with electrospray ionization analysis results, the refractory organics (e.g. polycyclic aromatics (AI > 0.66), polyphenols (0.66 ≥ AI > 0.50)) were greatly degraded by both the MW/H 2 O 2 and MW/PS processes, but the MW/PS process degraded dissolved organic matter (DOM) over a wider range than the MW/H 2 O 2 process due to the different dominant radicals in the two processes. In addition, after reaction in the MW/PS process, the O/C ratio of DOM in the treated effluent showed an obvious increase, which can be mainly attributed to the reaction of sulfate radicals with the N- and S- containing compounds via single electron transfer. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 397
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 143780123
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2020.122785