Article

Characterization of dissolved organic matter in leachate discharged from final disposal sites which contained municipal solid waste incineration residues

Department of Environmental Engineering, The University of Seoul, 90 Jeonnong-dong, Dongdaemun-gu, Seoul 130-173, South Korea.
Journal of Hazardous Materials (Impact Factor: 4.53). 10/2007; 148(3):679-92. DOI: 10.1016/j.jhazmat.2007.03.027
Source: PubMed

ABSTRACT

The properties of dissolved organic matter (DOM) in the leachates discharged from lysimeters and landfill sites containing municipal solid waste incineration residues (MSWIRs) were studied. DOM samples were divided into hydrophobic acid, base, neutral (Hpo-A, Hpo-B, Hpo-N) and hydrophilic (Hpi) fractions using the fractionation method employing DAX-8 resin. Hpi was the smallest fraction of all the raw leachate samples. The proportion of Hpo-N increased with increasing operating time. Landfill sites containing abundant non-combustible wastes showed a higher proportion of Hpo-B than Hpo-A. The molecular weights and functional groups of the DOM fractions were studied by using gel permeation chromatography and FTIR, respectively. In addition, the fluorescent properties and binding sites of the DOM fractions were investigated using fluorescence analysis. In the synchronous scan spectra of each DOM fraction, most of DOM fractions showed an emission peak for the main fluorophores at around 300 nm or 350 nm, which are regarded as aromatic amino acid-like fluorophores. The interaction between the DOM fraction and the pollutants (Cu(2+), pyrene and phenanthrene) was investigated using the fluorescence quenching method. It was observed that the aromatic amino acid-like fluorophores in the DOM fractions could be an important factor affecting complexation with the pollutants.

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    • "DOM samples were extracted from three leachates with different ages in this study. Four fractions, hydrophobic base (HOB) fractions, hydrophilic matter (HIM), hydrophobic acid (HOA) and hydrophobic neutral (HON) fractions, were isolated by the XAD-8 resin method from the leachate DOM (Leenheer and Croue, 2003; Seo et al., 2007). The main purpose of this paper was to study the composition and degradation potential of the bulk leachate DOM and its fractions using EEM spectra coupled with PARAFAC analysis. "
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    ABSTRACT: Dissolved organic matter (DOM) isolated from the leachates with different landfill ages was fractionated into hydrophobic acid (HOA), hydrophobic neutral (HON), hydrophobic base (HOB) fractions and hydrophilic matter (HIM) based on hydrophobicity, and the composition and degradation potential of the bulk DOM and its fractions were investigated by excitation-emission matrix fluorescence spectra coupled with parallel factor analysis. Results showed that the bulk DOM comprised fulvic-, humic-, tryptophan- and tyrosine-like substances, as well as component C1, whose composition and origin was unidentified. Landfill process increased the content of component C1, fulvic- and humic-like matter. The HON fractions comprised primarily component C1 and tyrosine-like matter. The HOA, HOB and HIM fractions isolated from the young leachates consisted mainly of tryptophan- and tyrosine-like substances. As to the intermediate and old leachates, the HOA and HOB fractions comprised mainly component C1, while the HIM comprised mainly fulvic-like matter. The HIM showed the most resistant against biodegradation among the four fractions, and was the main component of leachate treatment. Advanced oxidation and/or membrane treatment are recommended to remove the HIM fraction due to its hydrophilic and stable characteristics.
    Full-text · Article · Sep 2015 · Chemosphere
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    • "Studies on the interaction between metal ions and DOM are crucial for understanding the behavior and fate of metals in the environment. Seo et al. (2007) investigated the complexation process between Cu (II) and different fluorescence peaks identified from synchronousscan spectra of leachate DOM fractionation. He et al. (2010) investigated the interaction between Hg (II) and four fluorescence peaks identified by visual peak identification analysis of EEM spectra of bulk DOM in leachate, and Wu et al. (2011, 2012) characterized the complexation process between the metals (Cu (II), Pb (II), Zn (II) and Cd (II)) and different fluorescence components identified by the PARAFAC analysis of EEM spectra. "
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    ABSTRACT: Dissolved organic matter obtained from landfill leachate was separated into hydrophobic acid, base, neutral (HOA, HOB, HON) and hydrophilic (HIM) fractions. Fluorescence excitation-emission matrix spectra and parallel factor analysis were employed to characterize the composition, and fluorescence quenching titration technique was applied to study the complexation between Hg (II) and HON, HOA, and HIM fractions. Protein-like substances, humic-like compounds and xenobiotic organic matters (XOM) were identified in all fractions. The HOA, HOB and HON fractions comprised mainly XOM, while the HIM fraction consisted primarily of humic-like compounds. The complexation ability of protein-like substances was higher than that of humic-like compounds. The complexation ability of the HIM was highest for protein-like substances, while the complexation ability of the HON fraction was the highest for humic-like substances. The results suggested that the toxicity and bioavailability of the mercury in the young leachates was the highest, and decreased with landfill time.
    Full-text · Article · Oct 2012 · Ecotoxicology and Environmental Safety
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    • "For the complexity of multi-components in landfill leachate, fractionation of DOM is usually performed as a new and useful approach to differentiate and analyze the degradation of pollutants [19]. Correspondingly, multiplicate analytical methods are also available to further distinguish the characteristics of DOM in leachate [17] [20]. For instance, high-performance size exclusion chromatography (HPSEC), ultraviolet–visible (UV–vis) spectrometry, Fourier transform infrared (FT-IR) spectroscopy, and fluorescence excitation-emission matrix (EEM) spectroscopy have been employed to determine the molecular size magnitude, structures , and specific pollutants quantificationally and qualitatively [21] [22] [23]. "
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    ABSTRACT: Landfill leachate is generally characterized as a complex recalcitrant wastewater containing high concentration of dissolved organic matter (DOM). A combination of sequencing batch reactor (SBR)+aeration corrosive cell-Fenton (ACF)+granular activated carbon (GAC) adsorption in series was proposed for the purpose of removing pollutants in the leachate. Fractionation was also performed to investigate the composition changes and characteristics of the leachate DOM in each treatment process. Experimental results showed that organic matter, in terms of chemical oxygen demand (COD), 5-day biological oxygen demand (BOD(5)), and dissolved organic carbon (DOC), was reduced by 97.2%, 99.1%, and 98.7%, respectively. To differentiate the DOM portions, leachates were separated into five fractions by XAD-8 and XAD-4 resins: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N), and hydrophilic fraction (HPI). The predominant fraction in the raw leachate was HPO-A (36% of DOC), while the dominant fraction in the final effluent was HPI (53% of DOC). Accordingly, macromolecules were degraded to simpler ones in a relatively narrow range below 1000 Da. Spectral and chromatographic analyses also showed that most humic-like substances in all fractions were effectively removed during the treatments and led to a simultaneous decrease in aromaticity.
    Full-text · Article · Jul 2010 · Journal of hazardous materials
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