Thermal decomposition study of sewage sludge and of organicwaste used in the sorption of metals

Barros, Aldre Jorge Morais; Santos, José Carlos Oliveira; Prasad, Shiva; Leite, Valderí Duarte; Souza, A. G.; Soledade, L. E. B.; Duarte, Maíra Saldanha; Santos, Vandeci Dias dos

doi:10.1007/s10973-005-6599-6

Cited by 11 publications

(7 citation statements)

References 9 publications

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“…This is consistent with the finding that peak F3 was a baseline transition based on comparison with the standard sample, the lag rule of the DSC-DTG peak, and component correlation analysis, although some evidence suggests that peak F3 may be an endothermic pyrolysis peak. Similar transition phenomenon was observed in DSC experiment of sewage sludge 21 .…”

Section: Discussionsupporting

confidence: 85%

“…For example, when thermal degradation characteristics of pistachio shells in an N 2 atmosphere at different rate of heating were studied by use of a thermo-gravimetric analyzer, two main peaks were observed before and after 350 °C in the DTG curves 20 . A similar study was conducted by using DSC and TGA to monitor the composting of solid wastes such as vegetable waste and sludge 2 21 . Nevertheless, studies of anaerobic fermentation of biomass have usually been based on thermal oxidation data 22 23 24 25 , so advanced understanding of STDN of OM is still needed.…”

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confidence: 99%

“…Ongoing thermal analyses of OM have revealed differences between DSC curves of thermal oxidation and STDN. The former is composed of two or three exothermic peaks, while the latter is composed of two or three endothermic peaks and one exothermic peak, and there are several indistinct endothermic peaks associated with exothermic processes 2 21 .…”

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confidence: 99%

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Characterization of organic matter of plants from lakes by thermal analysis in a N2 atmosphere

Guo

et al. 2016

Sci Rep

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Organic matter (OM) has been characterized using thermal analysis in O2 atmospheres, but it is not clear if OM can be characterized using slow thermal degradation in N2 atmospheres (STDN). This article presents a new method to estimate the behavior of OM in anaerobic environment. Seventeen different plants from Tai Lake (Ch: Taihu), China were heated to 600 °C at a rate of 10 °C min−1 in a N2 atmosphere and characterized by use of differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). DSC chromatograms were compared with 9 standard compounds. Seven peaks were observed in DSC chromatograms, 2 main peaks strongly correlated with biochemical indices, and one main peak was a transitional stage. Energy absorbed by a peak at approximately 200 °C and total organic carbon were well correlated, while energy absorbed at approximately 460 °C was negatively correlated with lignin content. Presence of peaks at approximately 350 and 420 °C varied among plant biomass sources, providing potential evidence for biomass identification. Methods of STDN reported here were rapid and accurate ways to quantitatively characterize OM, which may provide useful information for understanding anaerobic behaviors of natural organic matters.

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Section: Discussionsupporting

confidence: 85%

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confidence: 99%

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Characterization of organic matter of plants from lakes by thermal analysis in a N2 atmosphere

Guo

et al. 2016

Sci Rep

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“…Pela análise de TGA observa-se que a quantidade de resíduo da fibra de coco bruta antes e após o experimento de biossorção foi de aproximadamente 1 e 10%, respectivamente. Essa diferença de resíduos deve-se ao acumulo dos metais de estrôncio na biomassa após a biossorção, aumentando o teor de resíduos inorgânicos (Barros et al, 2007).…”

Section: Análise Térmica Da Fcb Antes E Após a Biossorção De Sr 2+unclassified

“…38). A maior quantidade de resíduos após os experimentos de biossorção deve-se à formação de compostos de estrôncio na forma de óxidos e carbonato provenientes da remoção de Sr 2+ .SegundoBarros et. al.…”

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Estudo da remoção de Sr<sup>2+</sup> de soluções aquosas utilizando fibras de coco bruta e ativada com peróxido de hidrogênio em meio básico

Fonseca¹

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This work presents the potential of strontium ions removal from aqueous solutions using coconut fiber in raw and treated form with hydrogen peroxide, 1% and 4%, in alkaline conditions. The biosorption experiments were performed in batch mode with 2 mg.L-1 solution of Sr(NO 3) 2 and the influence of the following parameters were studied: contact time and pH. It was also evaluate the biosorption efficiency of the treated coconut fibers in comparison with the raw coconut fiber (RCF). The fibers characterizations before and after treatment and the presence of the Sr 2+ in the fibers were performed by scanning electron microscopy with a detector energy dispersive spectroscopy, diffraction of x-ray spectroscopy, infrared spectroscopy and thermal analysis. Among the studied fibers, the treated coconut fiber with 1% of H 2 O 2 (TCF 1) showed the major biosorption capacity of 3.6 mg.g-1 in the following conditions: 5 mg of biomass at pH 6, 90 minutes of contact time at room temperature. Treated coconut fiber with 4% H 2 O 2 (TCF 2) showed the lowest Sr 2+ ions removal due to degradation of the fibers constituents. For studies of biosorption isotherms, both raw and treated coconut fiber (TCF 1) were fitted better to Langmuir model and the kinetics reaction was of pseudo-second order. The thermodynamic parameters Gibbs free energy (ΔG) and distribution coefficient (K D) were-0.90 kJ.mol-1 and 265.3 L.Kg-1 for RCF and of-7,2 kJ.mol-1 and 824.3L.Kg-1 for TCF 1. These results demonstrated that the TCF 1 has good efficiency for removing Sr 2+ ions in the aqueous chemical waste and is a good alternative in treatment of liquid radioactive wastes containing 90 Sr.

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Study of the Interaction Mechanism in the Biosorption of Copper(II) Ions onto Posidonia oceanica and Peat

Izquierdo

Marzal

Gabaldón

et al. 2012

CLEAN Soil Air Water

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A systematic approach was used to characterize the biosorption of copper(II) onto two biosorbents, Posidonia oceanica and peat, focusing on the interaction mechanisms, the copper(II) sorption–desorption process and the thermal behavior of the biosorbents. Sorption isotherms at pH 4–6 were obtained and the experimental data were fitted to the Langmuir model with a maximum uptake (qmax) at pH 6 of 85.78 and 49.69 mg g−1, for P. oceanica and peat, respectively. A sequential desorption (SD) with water, Ca(NO3)2, and EDTA was applied to copper‐saturated biosorbents. Around 65–70% copper(II) were desorbed with EDTA, indicating that this heavy metal was strongly bound. The reversibility of copper(II) sorption was obtained by desorption with HCl and SD. Fourier transform IR spectroscopy (FTIR) analysis detected the presence of peaks associated with OH groups in aromatic and aliphatic structures, CH, CH2, and CH3 in aliphatic structures, COO− and COOH groups and unsaturated aromatic structures on the surface of both biosorbents, as well as peaks corresponding to SiO groups on the surface of peat. The results of SEM‐EDX and FTIR analysis of copper‐saturated samples demonstrated that ion exchange was one of the mechanisms involved in copper(II) retention. Thermal analysis of biosorbent samples showed that copper(II) sorption–desorption processes affected the thermal stability of the biosorbents.

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Thermal decomposition study of sewage sludge and of organicwaste used in the sorption of metals

Cited by 11 publications

References 9 publications

Characterization of organic matter of plants from lakes by thermal analysis in a N2 atmosphere

Characterization of organic matter of plants from lakes by thermal analysis in a N2 atmosphere

Estudo da remoção de Sr<sup>2+</sup> de soluções aquosas utilizando fibras de coco bruta e ativada com peróxido de hidrogênio em meio básico

Study of the Interaction Mechanism in the Biosorption of Copper(II) Ions onto Posidonia oceanica and Peat

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