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

doi:10.1007/s11783-012-0421-z

Front Envir Sci Eng

2012, Vol. 6

Issue (5) : 711-716 https://doi.org/10.1007/s11783-012-0421-z

RESEARCH ARTICLE

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

Guangxia QI, Dongbei YUE(

), Yongfeng NIE

Key Laboratory for Solid Waste Management and Environment Safety (Ministry of Education), Tsinghua University, Beijing 100084, China

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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

Corresponding Author(s): YUE Dongbei,Email:yuedb@tsinghua.edu.cn

Issue Date: 01 October 2012

Cite this article:

Guangxia QI,Dongbei YUE,Yongfeng NIE. Characterization of humic substances in bio-treated municipal solid waste landfill leachate[J]. Front Envir Sci Eng, 2012, 6(5): 711-716.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0421-z
https://academic.hep.com.cn/fese/EN/Y2012/V6/I5/711

Tab.1 Elemental composition of HSs extracted from the samples and of natural HSs compiled from the literature (elemental contents expressed on a percentage by weight ash-free and moisture-free basis)

Fig.1 UV-visible spectra of MBR-HSs (200 mg·L in 0.05 NaHCO solution at pH 8.0)

Fig.2 FTIR spectra of MBR-HSs

Fig.3 Solid-state CP-MAS C NMR spectra of MBR-HSs

Tab.2 Percentage distribution of carbon in MBR-HSs and in HA from sewage sludge, compost, peat, leonardite, and market based on solid-state CP-MAS C NMR spectral analysis

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