Journal
ENVIRONMENTAL POLLUTION
Volume 256, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.113467
Keywords
Landfill leachate; Fenton oxidation; Dissolved organic matter; Excitation emission matrix; Two-dimensional correlation spectroscopy
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Funding
- National Science Foundation of China [21707167]
- Key Research and Development Program of Hunan Province [2018SK2023]
- Fundamental Research Funds for the Central Universities of Central South University
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Membrane concentrated landfill leachate (MCLL) contains large amounts of recalcitrant organic matter that cause potential hazards to the environment. Knowledge on the compositional variation of MCLL during treatment is important for a better understanding on the degradation pathway of organic pollutants. In this work, the structural change of MCLL during Fenton oxidation process was examined using spectroscopic techniques. The removal rates of COD, TOC and UV254 reached 78.9 +/- 1.3%, 70.2 +/- 1.4% and 90.64 +/- 1.6%, respectively, under the optimal condition (i.e., dosage of H2O2 = 9.0 mL/200 mL, H2O2/Fe(II) molar ratio = 3.0, pH = 3.0, time = 40 min). Spectral analyses suggested that aromatic/C=C structure and C=0 bonds in MCLL can be successfully destroyed by Fenton oxidation, resulting in a decrease in molecular weight. One fulvic-like and one humic-like components were identified in MCLL, both of which can be removed by Fenton treatment. In addition, two-dimensional correlation spectroscopic analyses suggested the oxidative changes of MCLL structure in the order of fulvic-like component/unsaturated conjugated bond > aromatic structure > humic-like component. The results may provide a new insight to the understanding on the structure variation of MCLL during treatment, which is beneficial for the design of cost-effective treatment strategies. (C) 2019 Elsevier Ltd. All rights reserved.
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