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Modeling key intermediates during anaerobic digestion of lipid rich kitchen waste with an extended ADM1

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Abstract

Quantitative dynamics of the key intermediates, gases and carbohydrates during anaerobic digestion of different lipid rich kitchen waste and lipid rich model kitchen waste were modeled. Six batch reactors loaded with 25 g\(_\text {VS}\) l\(^{-1}\) (\(\sim\)39 \({\textrm{g}{_\text {O}}{_{2}}}\) l\(^{-1}\)) kitchen waste and model kitchen waste during a batch experiment were considered in simulation. Observed dynamics of carbohydrates, volatile organic acids and gases were described by an extended benchmark simulation model no. 2 (BSM2). In this study the extended BSM2 included a more detailed \(\beta\)-oxidation for prediction of caproic acid. Furthermore, the extensions included carbohydrate digestion with an additional intermediate before propionic acid was released. In addition, a novel simplification approach for initial pH estimation was successfully applied. For parameter estimation a Markov Chain Monte Carlo method was used to obtain parameter distributions. With the presented model it was possible even with no calibrated data to predict point of times of intermediates maxima and propionic acid with relative stable concentration over several days for kitchen waste.

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Abbreviations

ADM1:

Anaerobic digestion model no. 1

ASM1:

Activated sludge model no. 1

BSM2:

Benchmark simulation model no. 2

C:

Carbon

C2:

Acetic acid

C3:

Propionic acid

C4:

Butyric acid

C4i:

Iso-butyric acid

C4n:

N-butyric acid

C5:

Valeric acid

C5i:

Iso-valeric acid

C5n:

N-valeric acid

C6:

Caproic acid

CH\(_{4}\) :

Methane

CO\(_{2}\) :

Carbon dioxide

COD:

Chemical oxygen demand

FOS:

Volatile organic acids

GE:

Glucose equivalent

H\(_{2}\) :

Hydrogen

KW:

Kitchen waste

LCFA:

Long chain fatty acid

MCMC:

Markov Chain Monte Carlo

MKW:

Model kitchen waste

N:

Nitrogen

TAC:

Total inorganic carbon

sCOD:

Soluble chemical oxygen demand

sGE:

Soluble glucose equivalent

tCOD:

Total chemical oxygen demand

tGE:

Total glucose equivalent

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Acknowledgements

Many thanks to Mrs. Buch for constructive discussions. Additional, the author thanks syndicate Minett-Kompost for supporting this work. The author acknowledge the use of resources of University of Luxembourg.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Material preparation, experimentation, data collection, data analysis and manuscript writing was done by Simon Weber.

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Correspondence to Simon Weber.

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Weber, S. Modeling key intermediates during anaerobic digestion of lipid rich kitchen waste with an extended ADM1. Biodegradation (2024). https://doi.org/10.1007/s10532-024-10072-7

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  • DOI: https://doi.org/10.1007/s10532-024-10072-7

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