Kinetic Study of Methanization Process Through Mathematical Modeling in Biochemical Methane Potential Assays from Four Different Inoculants

Morais, Naassom Wagner Sales; Coelho, Milena Maciel Holanda; Oliveira, Maurício Guimarães de; Mourão, José Marcos Marques; Pereira, Erlon Lopes; Santos, André Bezerra dos

doi:10.1007/s11270-021-05387-7

Cited by 6 publications

(3 citation statements)

References 49 publications

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“…The modified Gompertz equation allows us to estimate the lag phase time λ and the maximum specific methane production rate R m [46]. The curve obtained has a fixed inflection point and is asymmetrical around the inflection point [47][48][49]. The negative lag times estimated from this equation were assumed to be 0 [50].…”

Section: Kinetics Analysismentioning

confidence: 99%

Methane Emissions from Livestock Slurry: Effects of Storage Temperature and Changes in Chemical Composition

Hilgert

Amon

et al. 2022

Sustainability

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Livestock production contributes to releasing methane into the atmosphere. Liquid manure management offers significant opportunities to reduce these emissions. A better understanding of the factors controlling methane emissions from manure is necessary to select effective mitigation strategies. Our study aimed to identify the influence of storage temperature and the associated change in chemical composition on methane emissions from dairy and fattening pig manure. Storage temperature affects microbial activity and induces changes in chemical composition that are key influences in methane emissions. Dairy and fattening pig manure samples were stored at five different temperatures (5–25 °C) for 90 days in a laboratory-scale experiment to measure the methane production. The chemical composition of the slurry samples was analyzed, and the biochemical methane potential (BMP) tests were performed before and after storage. For pig manure stored at 25 °C and 20 °C, methane emissions accounted for 69.3% and 50.3% of the BMP, respectively. Maximum methane emissions for dairy slurry were observed at 25 °C but remained at a low level. Analyses of the accumulation of volatile fatty acids (VFAs) during storage are presented in few studies, this work revealed a potential inhibition of methane production, where the accumulation of VFAs was most elevated in samples stored at 20 °C and 25 °C. This partly counteracted the increase in methane emissions expected from the higher temperatures. The degree of VFA and dissociated fatty acids accumulation in dairy cattle slurry should be assessed for more accurate estimations of methane emissions from slurry stores.

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Section: Kinetics Analysismentioning

confidence: 99%

Methane Emissions from Livestock Slurry: Effects of Storage Temperature and Changes in Chemical Composition

Hilgert

Amon

et al. 2022

Sustainability

View full text Add to dashboard Cite

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“…The modified Gompertz equation allowed the estimation of the lag phase time (λ) and the maximum specific CH 4 production rate (

) ( Zwietering et al, 1990 ). The curve obtained had a fixed inflection point and was asymmetric around the inflection point ( Herrmann et al, 2016 , Lo et al, 2010 , Morais et al, 2021 ). The negative lag times estimated from this equation were assumed to be 0 ( Dalgaard & Koutsoumanis, 2001 ).…”

Section: Methodsmentioning

confidence: 99%

Assessment of the biochemical methane potential of in-house and outdoor stored pig and dairy cow manure by evaluating chemical composition and storage conditions

et al. 2023

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“…Three known formulas will be used to judge whether the models represent the observed experimental data sufficiently well: the square regression coefficient (R 2 , Equation ( 8)), the normalized root mean square error (NRMSE, Equation ( 9)) and the corrected Akaike information criterion (AIC C , Equation ( 10)) [15,18,22].…”

Section: Statistical Comparison Of Modelsmentioning

confidence: 99%

Modelisation of the Biomethane Accumulation in Anaerobic Co-Digestion of Whey and Sugarcane Molasse Mixtures

Arotingo Guandinango,

Espín Valladares,

Núñez Pérez

et al. 2023

Fermentation

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The biomethane accumulation of several combinations of whey and sugarcane molasses, inoculated with sludge from a treatment facility of one of the dairy enterprises of the Imbabura province in Ecuador, was assessed in the current experiment at a constant COD0/VSin ratio of 0.5. The whey/molasses (W:M) ratios for each treatment were (in % (m/m)) 0:100, 25:75, 50:50, 75:25, and 100:0, with a constant temperature of 37 °C and an initial pH adjustment of 7.5. Half a litre of total mixes was used for each treatment in duplicate. Six kinetic models were evaluated to account biomethane accumulation in anaerobic co-digestion processes in batch of whey and sugarcane molasses. Five of these have been tested by other researchers, and one was developed by modifying a first-order model to consider changes in the biomethane accumulation profile. This proposed model, along with the modified two-phase Gompertz model, resulted in the ones that were best able to adjust the experimental data, obtaining in all cases an R2 ≥ 0.949, indicating the accuracy of both models. In addition, the proposed here model has five parameters, one less than the modified two-phase Gompertz model, making it more straightforward and robust.

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Kinetic Study of Methanization Process Through Mathematical Modeling in Biochemical Methane Potential Assays from Four Different Inoculants

Cited by 6 publications

References 49 publications

Methane Emissions from Livestock Slurry: Effects of Storage Temperature and Changes in Chemical Composition

Methane Emissions from Livestock Slurry: Effects of Storage Temperature and Changes in Chemical Composition

Assessment of the biochemical methane potential of in-house and outdoor stored pig and dairy cow manure by evaluating chemical composition and storage conditions

Modelisation of the Biomethane Accumulation in Anaerobic Co-Digestion of Whey and Sugarcane Molasse Mixtures

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