Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 397, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122785
Keywords
Landfill leachate; Microwave radiation; Persulfate; Hydrogen peroxide; Refractory organics
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Funding
- Cultivation Program for the Excellent Doctoral Dissertation of Southwest Jiaotong University [D-YB201907]
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This study investigated the degradation of organics in mature leachate treated by microwave radiation-activated persulfate (MW/PS) and hydrogen peroxide (MW/H2O2) processes. Obvious synergistic effects existed in both the MW/PS and MW/H2O2 processes, but were significantly higher in the MW/PS process. Refractory organics were better degraded by the MW/PS process than the MW/H2O2 process due to the major contribution of SO4 center dot-. 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/H2O2 and MW/PS processes, but the MW/PS process degraded dissolved organic matter (DOM) over a wider range than the MW/H2O2 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.
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