Spectroscopic studies of the effect of aerobic conditions on the chemical characteristics of humic acid in landfill leachate and its implication for the environment

Chai, Xin‐Sheng; Hao, Yongxia; Liu, Guixiang; Zhao, Xiaomeng; Zhao, Youcai

doi:10.1016/j.chemosphere.2013.01.052

Cited by 45 publications

(9 citation statements)

References 25 publications

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“…and C-O stretching of phenolic OH at the plateau at ~1410 cm -1 , stemming from the aliphatic group content in the humic acids (Seddaiu et al, 2013;Xiaoli et al, 2013). Asymmetric carboxyl stretches (Wulandari et al, 2008) and C=O stretches of quinones and/or amide groups can be found at 1619 cm -1 (Martinez et al, 2010).…”

Section: Sample Characterizationmentioning

confidence: 89%

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Citrate influences microbial Fe hydroxide reduction via a dissolution–disaggregation mechanism

Braunschweig

Klier

Schröder

et al. 2014

Geochimica et Cosmochimica Acta

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Please cite this article as: Braunschweig, J., Klier, C., Schröder, C., Händel, M., Bosch, J., Totsche, K.U., Meckenstock, R.U., Citrate influences microbial Fe hydroxide reduction via a dissolution-disaggregation mechanism, Geochimica et Cosmochimica Acta (2014), doi: http://dx.doi.org/10.1016/j.gca. 2014.05.006 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Modelling of abiotic dissolution kinetics revealed that colloid stabilization was most pronounced at citrate:Fe ratios of 0.1 -0.5, whereas higher ratios led to enhanced dissolution of both colloidal and larger aggregated fractions. Mathematical simulation of the microbial reduction kinetics under consideration of partial dissolution and colloid stabilization showed that the bioaccessibility increases in the order large aggregates < stable colloids < Fe-citrate.These findings indicate that much of the organic acid driven mobilization of Fe oxy(hydr)oxides is most likely due to colloid formation and stabilization rather than solubilisation.

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Section: Sample Characterizationmentioning

confidence: 89%

“…The C-O stretches probably stemmed from adsorbed carbonate of ambient CO 2 (Hausner et al, 2009 The FTIR spectrum of pure Gohy humic acids (Fig. 1B) showed aliphatic C-H stretching modes at 2928 cm -1 (Xiaoli et al, 2013) and symmetric stretching modes of COO…”

Section: Sample Characterizationmentioning

confidence: 99%

Citrate influences microbial Fe hydroxide reduction via a dissolution–disaggregation mechanism

Braunschweig

Klier

Schröder

et al. 2014

Geochimica et Cosmochimica Acta

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“…4) several bands indicated the presence of carboxylic compounds and amino acids: 1845, 1695 cm -1 (C=O stretching), 1662 cm -1 (C=O stretching of amide groups), the bands within 1620-1580 cm -1 (amide groups and aromatic C=C conjugated with C=O of COO -), 1331-1321 cm -1 (COO -), 934 cm -1 (H-bonded out-of-plane bending of C=O in COOH). There were also bands indicating the presence of aromatic compounds: 1562, 1500 cm -1 (C=C in aromatic rings, N-H), 1476 cm -1 (C=C, C-H and N-H), 870-700 cm -1 (aromatic =C-H out of plane deformation vibrations) [58,59,60]. The band at ~1911 cm -1 was the overtone and combination band due to the C-H out of plane deformation vibrations of aromatic rings [57].…”

Section: Biodegradability Improvementmentioning

confidence: 99%

Application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate

Bis

Montusiewicz

Ozonek

et al. 2015

Ultrasonics Sonochemistry

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In this study, the application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate was investigated. Three configurations of cavitation device were examined and operational parameters of the process were selected. The study indicated that the orifice plate with a 3/10mm diameter conical concentric hole, characterized by the cavitation number of 0.033, is a reasonable choice to ensure the enhanced biodegradability of mature leachate. Using such a configuration and maintaining 30 recirculation passes through the cavitation zone at inlet pressure of 7 bar, the highest increase of biodegradability index (BI) of approximately 22% occurred, i.e., from the value of 0.046 to 0.056. The FT-IR/PAS analysis confirmed a degradation of refractory compounds that typically prevail in mature leachate. An evaluation of energy efficiency was made in terms of the actual consumed energy measured by using the Kyoritsu KEW6310 Power Quality Tester. A cavitational yield of 9.8 mg COD kJ(-1) was obtained for the optimum configuration and 30 recirculation passes. Regarding energy efficiency, the application of 10 cavitation cycles appeared to be the most profitable. This was due to an almost threefold higher cavitational yield of 27.5 mg COD kJ(-1). However, the preferable option should be selected by considering a satisfactory effect in the biodegradability enhancement.

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“…For instance, TOC (total organic carbon), COD (chemical oxygen demand), and BOD (biochemical oxygen demand), whereas the determination of humic or recalcitrant substances can be carried out by the analysis of DOC (dissolved organic carbon) (APHA, 1999;KJELDSEN et al, 2002). According to some authors, the composition of dissolved organic matter in landfill leachate can also be determined by other methods such as infrared spectroscopy (IR), Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), mass spectroscopy, among others (Kang et al, 2002;Xiaoli et al, 2013;Peixoto et al 2018). These techniques can be used to characterize landfill leachate and thus identify humic substances by providing the chemical structure of organic matter, the identification of functional groups, structural properties, and molecular mass, among others.…”

Section: Introductionmentioning

confidence: 99%

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Monteiro

Barquilha²,

Braga³

2020

REGET

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Landfill sanitary leachate is an effluent with complex characteristics that still presents some challenges for treatment. From the stabilization of the organic matter which occurs over the years in a landfill, the leachate biodegradability decreases, decreasing the biological treatment efficiency. The objective of this research was to identify the characteristics of leachate from an old landfill, located in Curitiba-BR, using conventional and spectroscopic methods. Two collects of raw leachate were carried out at the Curitiba Municipal Landfill in different periods, which were denominated P11 and P12. The analyzes performed were pH, COD, BOD, DOC, color and solids, as well as UV-Vis and fluorescence spectroscopies. The results indicated that the leachate was influenced by precipitation taxes and it is possible to infer that this landfill is in the aging process, since the leachate presented recalcitrant characteristics. The organic matter presented a strong humification degree due to the presence of aromatic substances, such as humic and fulvic acids, indicating that physical-chemical treatment should be applied to this leachate. In addition, the spectroscopic analysis brought additional information, with a quicker and lower reagent consumption than conventional methods. Thus, these spectroscopic techniques can be considered promising tools to monitor the leachate, assist in the identification of the landfill decomposition stage, and subsidize the planning for proper leachate treatment.

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Spectroscopic studies of the effect of aerobic conditions on the chemical characteristics of humic acid in landfill leachate and its implication for the environment

Cited by 45 publications

References 25 publications

Citrate influences microbial Fe hydroxide reduction via a dissolution–disaggregation mechanism

Citrate influences microbial Fe hydroxide reduction via a dissolution–disaggregation mechanism

Application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

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