Production of high-calorific biogas from food waste by integrating two approaches: Autogenerative high-pressure and hydrogen injection

Sangmi, Kim; Mostafa, Alsayed; Im, Seongwon; Lee, Chang Kyu; Kang, Seoktae; Na, Jeong-Geol; Kim, Dong-Hoon

doi:10.1016/j.watres.2021.116920

Cited by 30 publications

(15 citation statements)

References 46 publications

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“…Interestingly, the methane content creased from 52.4% to 67% with an increase in excess pressure from 1 to 3 bar. The dif ence in AD performances can be explained by the extremely high OLR (5.49-16.38 VS/(m 3 ·day) in the current work compared to Kim et al [43].…”

Section: Discussioncontrasting

confidence: 69%

“…Table 3 summarizes the results of such studies. The most similar substrate (simulated food waste) was subjected to anaerobic digestion in 3-L digesters by Kim et al [43]. At OLR of 2.67 kg COD/(m 3 •day) and overpressure from 1 to 3 bars, the MPR and MY values were obtained in the range of 0.74-0.75 L/(L•day) and 280 mL/g COD, respectively; pH had near-neutral values (7.4-7.5).…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussioncontrasting

confidence: 69%

Section: Discussionmentioning

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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“…Comparing methane content at high pressures, it could be found that they are resembling. In particular, Kim et al [ 52 ] reported that the increase of CH 4 content in the biogas at elevated pressure is usually investigated by using continuous reactors. CH 4 content values in the range 75–78%v/v were achieved at 9 bar in an anaerobic filter system fed with diluted maize silage and grass of 20–25 g COD/L [ 23 , 53 , 54 ]; moreover, it achieved 80%v/v and 90%v/v at 6 and 17 bar, respectively, from the food waste of having 100 g COD/L [ 55 ].…”

Section: Resultsmentioning

confidence: 99%

“…CH 4 content values in the range 75–78%v/v were achieved at 9 bar in an anaerobic filter system fed with diluted maize silage and grass of 20–25 g COD/L [ 23 , 53 , 54 ]; moreover, it achieved 80%v/v and 90%v/v at 6 and 17 bar, respectively, from the food waste of having 100 g COD/L [ 55 ]. However, Kim et al [ 52 ] pointed out that comparisons with former performance are not suitable in AHPD, since the CH 4 content could be varied depending on the substrate characteristics, in particular, substrate concentration. Therefore, variability of initial COD concentration represents a further parameter to investigate.…”

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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“…Since injected H 2 could use surplus CO 2 dissolved in the liquid phase of HPAD to mitigate the decreasing pH and further convert CO 2 into CH 4 internally. Kim et al (Kim et al, 2021) claimed that after the addition of H 2 into the HPAD reactor, the CH 4 content increased up to 92.1% compared to 77.4% of the control, and pH increased from 6.7 to 8.7 at 5 bar when treating food waste. Thus, these two technologies could make up for each other's shortcomings.…”

Section: H 2 Additionmentioning

confidence: 99%

Recent progress towards in-situ biogas upgrading technologies

Zhao

Dong

2021

Science of The Total Environment

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Production of high-calorific biogas from food waste by integrating two approaches: Autogenerative high-pressure and hydrogen injection

Cited by 30 publications

References 46 publications

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

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

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

Recent progress towards in-situ biogas upgrading technologies

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