Characterization of humic substances in bio-treated municipal solid waste landfill leachate

Guangxia QI, Dongbei YUE, Yongfeng NIE

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PDF(147 KB)
Front. Environ. Sci. Eng. ›› 2012, Vol. 6 ›› Issue (5) : 711-716. DOI: 10.1007/s11783-012-0421-z
RESEARCH ARTICLE

Characterization of humic substances in bio-treated municipal solid waste landfill leachate

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Abstract

Considerable organic matter remains in municipal solid waste landfill leachate after biological treatments. Humic substances (HSs) dominate the organic matter in bio-treated landfill leachate. In this study, the HSs from landfill leachate treated by membrane bioreactor (MBR-HSs) were analyzed via elemental analysis, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, and charge polarized magic-angle spinning-13C-nuclear magnetic resonance. The characteristic absorption in the UV wavelength range indicated the presence of high C=C and C=O double bonds within the MBR-HSs. Compared with commercial HSs, MBR-HSs had lower carbon content [48.14% for fulvic acids (FA) and 49.52% for humic acids (HA)], higher nitrogen content (4.31% for FA and 6.16% for HA), lower aromatic structure content, and higher carbohydrate and carboxylic atoms of carbon content. FA predominantly had an aliphatic structure, and HA had less condensed or substituted aromatic ring structures than natural HA. The aromatic carbon content of MBR-HSs was lower than that of humus-derived HSs but higher than that of waste-derived HSs, indicating that MBR-HSs appeared to be more similar to humus-derived HSs than waste-derived HA.

Keywords

bio-treated landfill leachate / humic substances / elemental analysis / spectroscopic characteristics

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Guangxia QI, Dongbei YUE, Yongfeng NIE. Characterization of humic substances in bio-treated municipal solid waste landfill leachate. Front Envir Sci Eng, 2012, 6(5): 711‒716 https://doi.org/10.1007/s11783-012-0421-z

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Acknowledgements

This work was supported by the National Key Project of Scientific and Technical Supporting Programs of China (Nos. 2006BAC06B05 and 2006BAC06B01), the Beijing Science and Technology Project (No. D08040600350804) and the Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education (No. SWMES2010-12).

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