High-pressure anaerobic digestion up to 100 bar: influence of initial pressure on production kinetics and specific methane yields

Merkle, Wolfgang; Baer, Katharina; Haag, Nicola Leonard; Zielonka, Simon; Ortloff, Felix; Graf, Frank; Lemmer, Andreas

doi:10.1080/09593330.2016.1192691

Cited by 23 publications

(5 citation statements)

References 15 publications

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“…Based on the design of the two-phase AD process, Gianico et al (2015) enhanced process stabilization and improved VS removal efficiency and methane yield through sequential mesophilic/thermophilic AD. A number of researches have established pressurized AD systems to improve biogas production and purify the biogas (Chen et al, 2014;Merkle et al, 2017aMerkle et al, , 2017b. By increasing operating pressures in methane reactors, methane content could be increased up to 90.45% at 50 bar.…”

Section: Recent Development For Enhancing Resource Recoverymentioning

confidence: 99%

“…Jones and Greenfield (1982) revealed that regulating metabolic pathways through controlling headspace pressure resulted in gas dissolved in the reactor. Previous studies have reported that headspace environment including headspace pressure and partial pressure is an important factor for management of the metabolic pathways and regulating specific metabolic products on the acidogenic phase (Merkle et al, 2017a;Yan et al, 2017). Upon a decrease in hydrogen partial pressure, the hydrogen production also decreases, which consequently changes the underlying metabolic processes.…”

Section: Critical Factors Affecting Acidogenic Processmentioning

confidence: 99%

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A mini-review on the metabolic pathways of food waste two-phase anaerobic digestion system

2019

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Food waste (FW) disposal has become a global social, environmental, and economic problem. The current practice of landfilling is undesirable due to its potential emission of greenhouse gas, nutrient recycling, and pollution of water resources. Anaerobic digestion (AD), particularly two-phase AD is a promising option to manage FW and recover energy in the form of methane and obtain value-added by-products. However, most current review literature focuses on operating conditions while often placing little emphasis on improving conversion efficiency through regulating intermediate products. The AD process involves complex metabolic reactions carried out by several microbial groups. Therefore, understanding of these metabolic pathways existing in AD is the key to design effective strategies for enrichment of specific microbial groups which can produce desired intermediates for methane production, which can possibly be achieved by an understanding of the influence of critical process parameters on these metabolic pathways. Thus, it is the aim of this review to describe the effect of process conditions on underlying metabolic pathways in order to allow an efficient manipulation of these pathways for enhancing methane production.

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Section: Recent Development For Enhancing Resource Recoverymentioning

confidence: 99%

Section: Critical Factors Affecting Acidogenic Processmentioning

confidence: 99%

A mini-review on the metabolic pathways of food waste two-phase anaerobic digestion system

2019

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“…Several empirical studies focused on the variation in microbial composition, i.e. bacteria and archaea, dominating the process [ 22 , 39 , 40 ]. These studies highlighted the interaction between community composition, CH 4 content of the biogas and rate of biogas production.…”

Section: Resultsmentioning

confidence: 99%

Modelling of autogenerative high-pressure anaerobic digestion in a batch reactor for the production of pressurised biogas

Crescenzo

Marzocchella

Karatza

et al. 2022

Biotechnol Biofuels

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Background Pressurised anaerobic digestion allows the production of biogas with a high content of methane and, at the same time, avoid the energy costs for the biogas upgrading and injection into the distribution grid. The technology carries potential, but the research faces practical constraints by a.o. the capital investment needed in high-pressure reactors and sensors and associated sampling limitations. In this work, the kinetic model of an autogenerative high-pressure anaerobic digestion of acetate, as the representative compound of the aceticlastic methanogenesis route, in batch configuration, is proposed to predict the dynamic performance of pressurised digesters and support future experimental work. The modelling of autogenerative high-pressure anaerobic digestion in batch configuration, which is not extensively studied and simulated in the present literature, was developed, calibrated, and validated by using experimental results available from the literature. Results Under high-pressure conditions, the assessment of the Monod maximum specific uptake rate, the half-saturation constant and the first-order decay rate was carried out, and the values of 5.9 kg COD kg COD−1 d−1, 0.05 kg COD m−3 and 0.02 d−1 were determined, respectively. By using the predicted values, excellent fittings of the final pressure, the CH4 molar fraction and the specific methanogenic yield calculation were obtained. Likewise, the variation in the gas–liquid mass transfer coefficient by several orders of magnitude showed negligible effects on the model predictive values in terms of methane molar fraction of the produced biogas, while the final pressure seemed to be slightly influenced. Conclusions The proposed model allowed to estimate the Monod maximum specific uptake rate for acetate, the half-saturation rate for acetate and the first-order decay rate constant, which were comparable with literature values reported for well-studied methanogens under anaerobic digestion at atmospheric pressure. The methane molar fraction and the final pressure predicted by the model showed different responses towards the variation of the gas–liquid mass transfer coefficient since the former seemed not to be affected by the variation of the gas–liquid mass transfer coefficient; in contrast, the final pressure seemed to be slightly influenced. The proposed approach may also allow to potentially identify the methanogens species able to be predominant at high pressure.

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“…However, there are few studies on the effect of increased pressure on the performance of digesters [36]. Modern research is mainly focused on the use of high pressure in biogas technology to increase the calorific value of biogas and its further use in gas distribution networks [19,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Anaerobic Codigestion of Municipal Organic Waste in Moderately Pressurized Digesters: A Case for the Russian Federation

et al. 2022

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Anaerobic digestion (AD) is a promising option to obtain renewable energy in the form of biogas and reduce the anthropogenic impact on the environment. In recent years there has been increasing interest in using pressurized digesters to improve the quality of biogas. However, maintaining high overpressure increases the requirements for the explosion safety of digesters. Consequently, there are natural limitations in the available technologies and facilities suitable for full-scale operation. In this work, we aimed to evaluate the possibility of using overpressure in the digester to improve the efficiency of codigestion of common municipal organic waste–sewage sludge and the organic fraction of municipal solid waste. Three levels of moderate excess pressure (100, 150 and 200 kPa) were used to meet requirements of existing block-modular anaerobic bioreactors based on railway tanks, which are widely utilized for AD in the Russian Federation. There was no significant change in methane content in biogas (65% ± 3%) at different values of overpressure, hydraulic retention time (HRT) and organic loading rate (OLR). The maximum methane and energy production rates (2.365 L/(L·day) and 94.27 kJ/(L·day), respectively) were obtained at an overpressure of 200 kPa, HRT of 5 days and OLR of 14 kg VS/(m3·day). However, the maximum methane yield (202.44 mL/g VS), energy yield (8.07 kJ/g VS) and volatile solids (VS) removal (63.21%) were recorded at an overpressure of 150 kPa, HRT of 7 days and OLR of 10.4 kg VS/(m3·day). The pressured conditions showed better performance in terms of AD stability at high OLRs.

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High-pressure anaerobic digestion up to 100 bar: influence of initial pressure on production kinetics and specific methane yields

Cited by 23 publications

References 15 publications

A mini-review on the metabolic pathways of food waste two-phase anaerobic digestion system

A mini-review on the metabolic pathways of food waste two-phase anaerobic digestion system

Modelling of autogenerative high-pressure anaerobic digestion in a batch reactor for the production of pressurised biogas

Feasibility Study of Anaerobic Codigestion of Municipal Organic Waste in Moderately Pressurized Digesters: A Case for the Russian Federation

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