Heat production in municipal and industrial waste as revealed by isothermal microcalorimetry

Pushp, Mohit; Lönnermark, Anders; Hedenqvist, Mikael S.; Vikegard, Peter

doi:10.1007/s10973-021-11117-2

Cited by 4 publications

(2 citation statements)

References 23 publications

(30 reference statements)

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“…In all cases, the total inorganic carbon in the trap is a measure of the CER (Barros et al, 2011). Thirdly, the heat production rate of soil samples can be monitored in a calorimeter, and the headspace of the calorimetric ampoules or of parallel back-up reactors can be sampled at defined time points and quantified by alternative analytics, such as gas-chromatography, as discussed in Pushp et al, 2021. To link calorespirometric data and energy and matter turnover in soil systems, thermodynamic models are being developed to investigate the link between CR, CUE and EUE. Hansen et al (2004) established a quantitative model linking CR with CUE, which is widely used today.…”

Section: Introductionmentioning

confidence: 99%

Enhancing insights: exploring the information content of calorespirometric ratio in dynamic soil microbial growth processes through calorimetry

Yang,

Di Lodovico,

Rupp

et al. 2024

Front. Microbiol.

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Catalytic activity of microbial communities maintains the services and functions of soils. Microbial communities require energy and carbon for microbial growth, which they obtain by transforming organic matter (OM), oxidizing a fraction of it and transferring the electrons to various terminal acceptors. Quantifying the relations between matter and energy fluxes is possible when key parameters such as reaction enthalpy (∆rH), energy use efficiency (related to enthalpy) (EUE), carbon use efficiency (CUE), calorespirometric ratio (CR), carbon dioxide evolution rate (CER), and the apparent specific growth rate (μapp) are known. However, the determination of these parameters suffers from unsatisfying accuracy at the technical (sample size, instrument sensitivity), experimental (sample aeration) and data processing levels thus affecting the precise quantification of relationships between carbon and energy fluxes. To address these questions under controlled conditions, we analyzed microbial turnover processes in a model soil amended using a readily metabolizable substrate (glucose) and three commercial isothermal microcalorimeters (MC-Cal/100P, TAM Air and TAM III) with different sample sizes meaning varying volume-related thermal detection limits (LODv) (0.05−1mW L−1). We conducted aeration experiments (aerated and un-aerated calorimetric ampoules) to investigate the influence of oxygen limitation and thermal perturbation on the measurement signal. We monitored the CER by measuring the additional heat caused by CO2 absorption using a NaOH solution acting as a CO2 trap. The range of errors associated with the calorimetrically derived μapp, EUE, and CR was determined and compared with the requirements for quantifying CUE and the degree of anaerobicity (ηA). Calorimetrically derived μapp and EUE were independent of the instrument used. However, instruments with a low LODv yielded the most accurate results. Opening and closing the ampoules for oxygen and CO2 exchange did not significantly affect metabolic heats. However, regular opening during calorimetrically derived CER measurements caused significant measuring errors due to strong thermal perturbation of the measurement signal. Comparisons between experimentally determined CR, CUE,ηA, and modeling indicate that the evaluation of CR should be performed with caution.

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Section: Introductionmentioning

confidence: 99%

Enhancing insights: exploring the information content of calorespirometric ratio in dynamic soil microbial growth processes through calorimetry

Yang,

Di Lodovico,

Rupp

et al. 2024

Front. Microbiol.

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“…In a study on heat production in municipal waste, 23 the authors used isothermal calorimetry and compared different samples' reactivity by the time to reach a total heat of 40 J for approximately the same sample mass (0.5 g). For their material and purpose, authors argued that 40 J was the best trade‐off between uncertainties in measurements of the thermal power and oxygen depletion in the ampoules.…”

Section: Introductionmentioning

confidence: 99%

A theoretical evaluation of the impact of the type of reaction on heat production and material losses in biomass piles

Dahlbom¹,

Anerud²,

Lönnermark³

et al. 2023

Fire and Materials

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Self‐heating during storage of biomass in piles causes material losses, leads to emissions to air, and poses a risk of fire. There are different techniques to assess a biomass material's propensity for self‐heating, some of these are briefly reviewed. One of these techniques is isothermal calorimetry, which measures thermal power from materials and produces time‐resolved curves. A recently developed and published test standard, ISO 20049‐1:2020, describes how the self‐heating of pelletized biofuels can be determined by means of isothermal calorimetry and how thermal power and the total heat produced during the test should be measured by isothermal calorimetry. This paper supports interpretation of the result obtained by isothermal calorimetry; the mentioned standard provides examples of peak thermal power and total heat but does not provide any assistance on how the result from isothermal measurements should be interpreted or how the result from measurements on different samples could be compared. This paper addresses the impact of different types of reactions, peak thermal power, total heat released (heat of reaction), activation energy, heat conductivity, and pile size on the temperature development in a generic pile of biomass. This paper addresses important parameters when the result from isothermal calorimetry is evaluated. The most important parameter, with respect to temperature development in large piles, was found to be the total heat released. It was also proposed that safe storage times, that is, the time until a run‐away of the temperature in the pile, could be ranked based on the time to the peak thermal power.

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Prediction of the self-ignition temperature in lagging fires by means of isothermal calorimetry

Dahlbom¹,

Hulteberg²

2023

Journal of Loss Prevention in the Process Industries

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Heat production in municipal and industrial waste as revealed by isothermal microcalorimetry

Cited by 4 publications

References 23 publications

Enhancing insights: exploring the information content of calorespirometric ratio in dynamic soil microbial growth processes through calorimetry

Enhancing insights: exploring the information content of calorespirometric ratio in dynamic soil microbial growth processes through calorimetry

A theoretical evaluation of the impact of the type of reaction on heat production and material losses in biomass piles

Prediction of the self-ignition temperature in lagging fires by means of isothermal calorimetry

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