Thermogravimetry–Fourier transform infrared spectrometry–mass spectrometry technique to evaluate the effect of anaerobic digestion on gaseous products of sewage sludge sequential pyrolysis

Li, Xiaowei; Chen, Lubei; Dai, Xiaohu; Mei, Qingqing; Ding, Guo-jing

doi:10.1016/j.jaap.2017.05.018

Cited by 38 publications

(16 citation statements)

References 50 publications

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“…The last stage, passive pyrolysis (stage III), occurred at temperatures between 550 and 800 • C, where the degradation of high-temperature thermally stable components, such as lignin components happened. In contrast to SS and TLP, the digestates in this stage showed significant weight loss even at the highest temperatures (700-800 • C), which was associated with the deep decomposition of digestates, such as refractory organic matter, inorganic matter and char residues [12]. Decomposition of calcium carbonate and other minerals has been reported to occur in this temperature range as well [36].…”

Section: Analysis Of Tg and Dtg Curvesmentioning

confidence: 82%

“…Alternative, more environmentally friendly processes should be developed, due to stricter regulations and the environmental impacts associated with sewage sludge. Since sewage sludge has a relatively high calorific value and organic matter content, its waste-to-energy valorization technologies, such as anaerobic digestion [12], hydrothermal carbonization [13] and pyrolysis, are gaining attention [14].…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Petrović

Vohl

Predikaka³

et al. 2021

Sustainability

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This study investigates the pyrolysis behavior and reaction kinetics of two different types of solid digestates from: (i) sewage sludge and (ii) a mixture of sewage sludge and lignocellulosic biomass—Typha latifolia plant. Thermogravimetric data in the temperature range 25–800 °C were analyzed using Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose kinetic methods, and the thermodynamic parameters (ΔH, ΔG, and ΔS) were also determined. Biochars were characterized using different chemical methods (FTIR, SEM–EDS, XRD, heavy metal, and nutrient analysis) and tested as soil enhancers using a germination test. Finally, their potential for biosorption of NH4+, PO43−, Cu2+, and Cd2+ ions was studied. Kinetic and thermodynamic parameters revealed a complex degradation mechanism of digestates, as they showed higher activation energies than undigested materials. Values for sewage sludge digestate were between 57 and 351 kJ/mol, and for digestate composed of sewage sludge and T. latifolia between 62 and 401 kJ/mol. Characterizations of biochars revealed high nutrient content and promising potential for further use. The advantage of biochar obtained from a digestate mixture of sewage sludge and lignocellulosic biomass is the lower content of heavy metals. Biosorption tests showed low biosorption capacity of digestate-derived biochars and their modifications for NH4+ and PO43− ions, but high biosorption capacity for Cu2+ and Cd2+ ions. Modification with KOH was more efficient than modification with HCl. The digestate-derived biochars exhibited excellent performance in germination tests, especially at concentrations between 6 and 10 wt.%.

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Section: Analysis Of Tg and Dtg Curvesmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Petrović

Vohl

Predikaka³

et al. 2021

Sustainability

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“…SEM analyses was conducted in order to determine the surface structures of the virgin and sludge-based MPs using Hitachi SU-1500 scanning electron microscopy (SEM, Hitachi High Technologies Corp., Japan) according to the previous studies as reported by Mahon et al (2017). X-ray photoelectron spectroscopy (XPS) was applied to measure the Cd content on the surface of MP particles before and after the Cd adsorption experiment using X-ray photoelectron spectrometer (ESCALAB 250, Thermo Fisher Scientific Inc., USA) (Li et al 2017). FTIR spectra of the virgin and sludge-based MPs were gained through a Nico 380 MX FTIR spectrometer using attenuated total reflectance module (Thermo Fisher Scientific Inc., USA).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Enhancement in adsorption potential of microplastics in sewage sludge for metal pollutants after the wastewater treatment process

et al. 2019

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Microplastics (MPs) as new pollutants of environmental concern have been widely detected in sewage sludge, and may act as significant vectors for metal pollutants due to their adsorption property. Our findings show that Cd, Pb, and Co, but not Ni, contents in sewage sludge are lower than that of corresponding metal irons adsorbed on sludge-based MPs, indicating that the MPs accumulate such metal pollutants as Cd in the sludge samples. In contrast to virgin MPs, sludge-based MPs are one order of magnitude higher adsorption capacity for Cd, which reaches up to 2.523 mg g -1 , implying that there is a considerable enhancement in adsorption potential of the MPs for metals after the wastewater treatment process. SEM analysis shows that sludge-based MPs have rougher and more porous surface than virgin MPs, and FTIR spectra reveal that functional groups such as C-O and O-H are found on sludge-based MPs. Further, two-dimensional FTIR correlation spectroscopy indicates that C-O and N-H functional groups play a vital role in the process that sludge-based MPs adsorb Cd, which are not found in virgin MPs. The results imply that increased adsorption potentials of the sludge-based MPs to Cd are attributed to changes in the MP physicochemical properties during wastewater treatment process. In addition, such factors as pH value, and sludge inorganic and organic components also have an effect on the MP adsorption to Cd. Principal component analysis shows that the MPs could be divided into three categories, i.e. polyamide, rubbery MPs (polyethylene and polypropylene) and glassy MPs (polyvinyl chloride and polystyrene). Their adsorption potentials to Cd follow the decreasing order: polyamide > rubbery MPs > glassy MPs.

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“…This implies that the degradation rate of protein-like materials in the sewage sludge is higher than those of phenolic groups, carboxylic acids and/or cellulose-like groups during anaerobic or aerobic digestion, corresponding to the previous ndings. 5,44,45 Compared with AnD, AoD exhibited higher proportions of amide I and II groups (protein-like groups), phenolic groups, carboxylic acids and/or cellulose-like groups and lower proportion of polysaccharide-like substances. This result shows that the aerobic digestate has higher proportions of protein-like and aromatic groups and a lower percentage of polysaccharidelike materials compared with the anaerobic digestate.…”

Section: Ftir Spectramentioning

confidence: 98%

“…Unfortunately, anaerobic or aerobic digestion oen results in a low degradation rate of organic matter (oen less than 50%) for the sewage sludge treatment. [2][3][4][5] This indicates that more than 50% of organic matter cannot be biologically degraded during anaerobic or aerobic digestion, thus causing limited sludge reduction. To date, the chemical characteristics of refractory organic matter are hardly known, and they need to be investigated because they can supply important information for further enhancing the degradation rate of organic matter during sludge digestion.…”

Section: Introductionmentioning

confidence: 99%

Molecular characteristics of the refractory organic matter in the anaerobic and aerobic digestates of sewage sludge

Mei

Yan

et al. 2018

RSC Adv.

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Thermogravimetry–Fourier transform infrared spectrometry–mass spectrometry technique to evaluate the effect of anaerobic digestion on gaseous products of sewage sludge sequential pyrolysis

Cited by 38 publications

References 50 publications

Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Enhancement in adsorption potential of microplastics in sewage sludge for metal pollutants after the wastewater treatment process

Molecular characteristics of the refractory organic matter in the anaerobic and aerobic digestates of sewage sludge

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