Impact of Substrate Biodegradability on the Identification of Endogenous Compounds During Anaerobic Digestion

Fernández-Domínguez, David; Patureau, Dominique; Jimenez, Julie

doi:10.1007/s12649-023-02197-2

Cited by 2 publications

(3 citation statements)

References 71 publications

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“…Fernandez-Lopez et al [53] reported that fresh and digested swine manure samples showed similar Ea values, thus indicating a negligible effect of anaerobic digestion. However, different authors have described changes in the thermal profiles, where a reduction in labile compounds and increased structural complexity were demonstrated using different spectroscopic techniques [8,11,50]. Results obtained in this study align with those of Otero et al [55], who also reported a decrease in Ea after digesting cattle manure.…”

Section: Stimation Of Activation Energysupporting

confidence: 87%

“…Spectroscopic analysis aids in understanding changes in organic material suffered during microbial degradation. This technique has provided useful information when evaluating the composting of lignocellulosic material and wastes [56][57][58] and studying the digestion process of different substrates [8,[59][60][61]. Figure 6 shows the spectra obtained from the feed and digested samples.…”

Section: Ftirmentioning

confidence: 99%

“…2 chemical structure of digestate based on inoculum type, digestion time, and substrate composition, reporting significant differences in digestates based on these parameters [8]. The biological anaerobic process occurs in a series of reactions where hydrolysis of complex substrates is the first stage, solubilizing particles and making them accessible to the microflora.…”

Section: Introductionmentioning

confidence: 99%

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Assessing Digestate at Different Stabilization Stages: Application of Thermal Analysis and FTIR Spectroscopy

González-Rojo,

Carrillo-Peña,

González

et al. 2024

Preprint

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Anaerobic digestion is a biological process that transforms high-strength organic effluents into biogas with multiple benefits. However, concurrent with organics' biological transformation, a liquid phase with a high solid content is also derived from this process. Valorizing this fraction is not an easy task if an agronomic application cannot be considered as a suitable option. The thermal valorization of this fraction allows for energy extraction, but also gives rise to additional capital investment and increases the energy demand of the global process. In addition, the thermal treatment of digestate has to deal with a mineralized material. The changes in organic matter due to anaerobic stabilization were studied in the present manuscript, by evaluating the thermal behavior of samples, activation energy and organic transformation using FTIR spectroscopy. Digested samples of a mixture composed of manure and glycerin (5% v/v) were studied. The stabilization caused a dramatic decrease in aliphatic compounds, greatly increasing the mineral content of the sample. Thermal valorization of digestates must consider the lower energy content and more complex structure of these materials, with higher content of lignin and protein-type compounds.

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Section: Stimation Of Activation Energysupporting

confidence: 87%

Section: Ftirmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessing Digestate at Different Stabilization Stages: Application of Thermal Analysis and FTIR Spectroscopy

González-Rojo,

Carrillo-Peña,

González

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Assessing Digestate at Different Stabilization Stages: Application of Thermal Analysis and FTIR Spectroscopy

González-Rojo,

Carrillo-Peña,

González

et al. 2024

Eng

View full text Add to dashboard Cite

Anaerobic digestion is a biological process that transforms high-strength organic effluents into biogas with multiple benefits. However, concurrent with organics’ biological transformation, a liquid phase with a high solid content is also derived from this process. Valorizing this fraction is not an easy task if an agronomic application cannot be considered as a suitable option. The thermal valorization of this fraction allows for energy extraction but also gives rise to additional capital investment and increases the energy demand of the global process. In addition, the thermal treatment of digestate has to deal with a mineralized material. The changes in organic matter due to anaerobic digestion were studied in the present manuscript, by evaluating the thermal behavior of samples, activation energy, and organic transformation using Fourier transform infrared (FTIR) spectroscopy. Digested samples of a mixture composed of manure and glycerin (5% v/v) were studied. The stabilization caused a dramatic decrease in aliphatic compounds, greatly increasing the mineral content of the sample. Results from differential scanning calorimetry (DSC) indicated an energy content of 11 kJ/g for the feed material and a reduction to 9.6 kJ/g for the long-term stabilized sample. The activation energy of the feed was 249.5 kJ/mol, whereas this value was reduced to 70–80 kJ/mol for digested samples. If the valorization route selected for digestates is thermal conversion, the lower energy content and more complex structure of these materials (higher content of lignin and protein-type compounds) must be carefully evaluated.

show abstract

Impact of Substrate Biodegradability on the Identification of Endogenous Compounds During Anaerobic Digestion

Cited by 2 publications

References 71 publications

Assessing Digestate at Different Stabilization Stages: Application of Thermal Analysis and FTIR Spectroscopy

Assessing Digestate at Different Stabilization Stages: Application of Thermal Analysis and FTIR Spectroscopy

Assessing Digestate at Different Stabilization Stages: Application of Thermal Analysis and FTIR Spectroscopy

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