Temperature Effects in Anaerobic Digestion Modeling

Bergland, Wenche Hennie; Dinamarca, Carlos; Bakke, Rune

doi:10.3384/ecp15119261

Cited by 14 publications

(20 citation statements)

References 18 publications

(14 reference statements)

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“…1) is generally approximated by a Monod type saturation function as the reaction rate of substrate uptake by organism, ρ (kg COD substrate m −3 d −1 ), as described in eqn (2).…”

Section: Model Parametersmentioning

confidence: 99%

“…The manure is on average 14% diluted by water used for washing purposes in the barn [6] making it a slurry and the handling of the slurry is described in Bergland et al [2]. To prepare the manure slurry as feed it was treated in a rotating vacuum drum filter (mesh light opening of 1.4 mm) to remove the coarse solids.…”

Section: Srtmentioning

confidence: 99%

“…An ADM1-T model [2] with relative temperature effects [3,4] for the degradation equations implemented is used here.…”

Section: Model Parametersmentioning

confidence: 99%

“…2.1.1 Temperature adjusted parameters in ADM1-T The kinetic temperature dependent parameters, K dis , K hyd and k m , for biochemical processes in ADM1-T [2] were varied with temperature in stepwise changes at 25°C, 30°C and 30°C.…”

Section: Model Parametersmentioning

confidence: 99%

“…Implications of AD at T<35°C to reduce heat losses is therefore studied. ADM1 included temperature effects on kinetic coefficients for the biochemical processes particle disintegration, hydrolysis and substrate uptake reactions (ADM1-T) were developed for this purpose [2]. This model combined with pilot tests is used here to examine temperature effects during a wide range of loadings.…”

mentioning

confidence: 99%

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Modelling Anaerobic Digestion during Temperature and Load Variations

Bergland¹,

Bakke²

2016

Int. J. EQ

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Experimental results and simulations based on the Anaerobic Digestion Model No.1 (ADM1) with temperature effects on kinetics were used to evaluate rate limiting steps in sludge bed anaerobic digestion (AD) during load and temperature variations. Simulations were carried out in Aquasim. The model is compared to data from a pilot experiment in a 220 liter AD sludge bed reactor treating diary manure for 16 months of various loads; 0-13 kg COD L −1 d −1 and various temperatures; 25°C, 30°C and 35°C. Methane and CO 2 production were monitored on-line while soluble and particulate organic carbon, pH and volatile fatty acids were measured on regularly collected inlet and effluent samples. Simulated overall soluble and particulate organic carbon removal, methane and CO 2 production, pH and acetate are close to measured values while propionate is underestimated during some transitions. The fit is mainly sensitive to the composition of the feed in terms of relative amounts of lipids, proteins and carbohydrates especially at simultaneously high load and low temperature. During such conditions, the model predicts accumulation of long chained fatty acids (LCFA), suggesting that the degradation of LCFA is the rate-limiting step at low temperatures. This effect is not explained by reduced LCFA solubility at lower temperature. The model predicts that sludge bed AD efficiency on substrates with little or no LCFA is independent of temperature between 25°C and 35°C while LCFA degradation is favoured by higher temperature. Keywords: ADM1, anaerobic digestion, rate limiting, sludge bed, temperature dependence. INTRODUCTIONAnaerobic digestion (AD) to recover energy as methane from organic wastes can reduce greenhouse gas emissions and contribute to more sustainable waste handling.The Anaerobic Digestion Model No.1 (ADM1) [1] is a common platform of modelling, simulations and understanding AD, developed by the International Water Association (IWA). ADM1 was developed primarily to model digestion of sludge from wastewater treatment plants at standard process temperatures 35°C and 55°C, presumed optimal for respectively meso-and thermophilic digestion.Process heating can consume a large portion of the potential energy of organic wastes, especially in AD of low energy substrates, such as cow manure slurry. Implications of AD at T<35°C to reduce heat losses is therefore studied. ADM1 included temperature effects on kinetic coefficients for the biochemical processes particle disintegration, hydrolysis and substrate uptake reactions (ADM1-T) were developed for this purpose [2]. This model combined with pilot tests is used here to examine temperature effects during a wide range of loadings.Intermediate products are measured to identify rate limiting degradation steps since it is not always obvious what is the rate-limiting step. Disintegration, hydrolysis, propionate degradation and acetoclastic methanogenesis are often considered to be possible rate limiting processes, depending on the feed composition. LCFA degradation may also be...

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“…1) is generally approximated by a Monod type saturation function as the reaction rate of substrate uptake by organism, ρ (kg COD substrate m −3 d −1 ), as described in eqn (2).…”

Section: Model Parametersmentioning

confidence: 99%

Section: Srtmentioning

confidence: 99%

“…An ADM1-T model [2] with relative temperature effects [3,4] for the degradation equations implemented is used here.…”

Section: Model Parametersmentioning

confidence: 99%

Section: Model Parametersmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Modelling Anaerobic Digestion during Temperature and Load Variations

Bergland¹,

Bakke²

2016

Int. J. EQ

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Comparative analysis in the performances of four in‐ground lagoon anaerobic digesters treating palm oil mill effluent (POME)

Yusof

Chan

Chong

2023

Asia-Pacific J Chem Eng

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While palm oil mill effluent (POME) from different sources will have varying characteristics due to the different process flows in mills, efficient monitoring and performance evaluation of anaerobic digesters in POME treatment are crucial to ensure stable biogas production with minimal operational problems. Therefore, this study aims to evaluate and compare the performances of in‐ground lagoon anaerobic digesters under mesophilic conditions in four different biogas plants (BGPs A, B, C and D) located in Malaysia with respect to total chemical oxygen demand (COD) removal and total biogas produced. Results show that all BGPs are still functioning well with satisfactory methane yields (.135–.364 Nm3 CH4/kgCOD removed) and COD removal efficiencies (67%–85%). ANOVA analysis shows that organic loading rate (OLR), temperature (T) and recirculation ratio (RR) have significant effects on the COD removal and biogas production of all four plants. BGP B has the highest amount of biogas produced (4.12 × 105 Nm3/month) and COD removal rate amongst other BGPs due to its most stable and lowest T (<40°C), high RR, and consistent and high COD load. Conversely, BGP D has the lowest COD removal and biogas production, which are mainly contributed by a high COD inlet (92 000 mg/L) and a high T in the anaerobic digester (48.7°C). Despite having a similar design of an anaerobic digester, this comparative study reveals that different BGPs will have different optimum operating conditions and limitations, depending not only on the operating conditions of the BGP (OLR, T and RR) but also on the raw POME quality stemming from the palm oil milling process. A future study would be focused on the optimisation of four BGPs for maximum biogas removal.

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Comparative Analysis of pH Prediction Routines in ADM1 and a Specialized Water Chemistry Simulator

Kosse,

Hernández Rodríguez,

Frahm

et al. 2024

Chemie Ingenieur Technik

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In anaerobic technology, pH values are crucial for targeted volatile fatty acid production. While pH dynamics can be modeled using the Anaerobic Digestion Model No. 1 (ADM1), simulation results may be biased. To address this issue, the pH prediction routine of Visual Water, a specialized water chemistry simulator, was validated. Unlike ADM1, it accounts for ionic strength and activities while also providing an automated uncertainty analysis. The analysis revealed Visual Water simulations to better fit measured pH data from acidic solutions in a miniaturized stirred‐tank reactor.

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Temperature Effects in Anaerobic Digestion Modeling

Cited by 14 publications

References 18 publications

Modelling Anaerobic Digestion during Temperature and Load Variations

Modelling Anaerobic Digestion during Temperature and Load Variations

Comparative analysis in the performances of four in‐ground lagoon anaerobic digesters treating palm oil mill effluent (POME)

Comparative Analysis of pH Prediction Routines in ADM1 and a Specialized Water Chemistry Simulator

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