Characterization of dissolved organic matter in leachate discharged from final disposal sites which contained municipal solid waste incineration residues
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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ABSTRACT: A set of simultaneous aerobic and anaerobic (SAA) bio-reactor system was used for the removal of organic pollutants and ammonia in the landfill leachate generated from Datian Shan Landfill in Guangzhou, China. The influent concentrations of COD and were 1000–3300 and 80–230 mg L−1, respectively. The average effluent concentrations of COD and were 131 and 7 mg L−1, respectively. The concentrations of COD and had reached the Chinese second grade effluent standard (COD < 300 mg L−1, < 25 mg L−1) for this kind of wastewater. Gas chromatogram–mass spectrum (GC/MS) analysis was used to measure the organic pollutants in the landfill leachate. About 87 organics were detected in this landfill leachate, and 16 of them belong to the list of environmental priority pollutants established by the US Environmental Protection Agency. About 31 of the 87 organic pollutants were completely removed by the SAA bio-reactor, the concentrations of further 14 organic pollutants were reduced by more than 80%, and the removal efficiencies of the other 25 organic pollutants were over 50%.Chemosphere 08/2008; 72(11-72):1751-1756. DOI:10.1016/j.chemosphere.2008.04.090 · 3.50 Impact Factor
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ABSTRACT: This paper systematically examined the characteristics of dissolved organic matter (DOM) in a dynamic membrane bioreactor (DMBR) for municipal wastewater with a laboratory-scale continuous-flow device. Experimental results showed that the system performed excellent pollutants’ removal efficiencies. The increase of trans-membrane pressure (TMP) for the dynamic membrane (DM) could be divided into three stages, i.e., zero increase stage, slow increase stage and abrupt rise stage. The maximal fouling rate of the DM reached to 4.34 kPa/h in abrupt rise stage. It was observed that the polysaccharides (PS) concentration of DOM samples gradually increased from the anaerobic zone to the aerobic zone in sequence, but the proteins (PN) concentration performed an opposite trend. The DM could retain a small part of the large molecular substances (>10 kDa) in the aerobic zone. Two particular fluorescence peaks appeared in the anaerobic zone and in the anoxic zone were also found in the effluent, which illustrated the dynamic cake layer closed to the stainless steel mesh might induce an anaerobic/anoxic micro environment. Based on the three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy analysis, aromatic proteins, aromatic protein-like substance, fulvic acid-like substances and soluble microbial by-product-like materials could be biodegraded effectively in the DMBR, and the DM could partly remove the humic acid-like substances and soluble microbial by-product-like materials.Chinese Science Bulletin 05/2013; 58(15). DOI:10.1007/s11434-013-5710-9 · 1.37 Impact Factor
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ABSTRACT: Dissolved organic matter (DOM) in leachate from landfills of three different ages (0, 5, and 10 year) was partitioned into hydrophobic acid, hydrophobic neutral, and hydrophilic matter fractions using the fractionation method employing XAD-8 resin. The spectroscopic characteristics of these fractions were determined through constant-wavelength synchronous fluorescence spectrometry (CWSFS). The interaction characteristic of phenanthrene with these fractions was determined through the fluorescence quenching method and CWSFS. The results revealed that the composition of DOM became complex with the increase in landfill age. The partition coefficients (K doc) for the three DOM samples of different landfill ages are in the order 10 a DOM > 5 a DOM > 0 a DOM. The hydrophobic fraction showed the highest K doc value among the DOM fractions. Lower linearity Stern–Volmer plots were observed in 10 a DOM and its hydrophobic fractions. CWSFS spectra showed that a special site was fully occupied with the addition of the quencher. Desorption was found in some fractions. Therefore, CWSFS is a sensitive tool for the detection of DOM-polycyclic aromatic hydrocarbon interaction.Environmental Earth Sciences 12/2012; 67(7). DOI:10.1007/s12665-012-1628-9 · 1.77 Impact Factor