Effects of high-pressure anaerobic digestion up to 30 bar on pH-value, production kinetics and specific methane yield

Lemmer, Andreas; Merkle, Wolfgang; Baer, Katharina; Graf, Frank

doi:10.1016/j.energy.2017.07.095

Cited by 40 publications

(21 citation statements)

References 23 publications

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“…Lemmer et al . 2017 investigated the methane production kinetics of methanogens cultivated on hydrolysate at high pressure, however a significant influence of the increase of the initial pressure on the increase of pressure was not observed . However, it is interesting to note that by comparing the results of MTa10 and MTa50 k min becomes more negative.…”

Section: Resultsmentioning

confidence: 99%

“…Comparing the point of time, where MER max and k min is determined, t MER,max and t kmin show similar results, therefore both methods are suitable to calculate the maximum gas conversion activity of the strains in a closed batch system. Lemmer et al 2017 investigated the methane production kinetics of methanogens cultivated on hydrolysate at high pressure, however a significant influence of the increase of the initial pressure on the increase of pressure was not observed [34]. However, it is interesting to note that by comparing the results of MTa10 and MTa50 k min becomes more negative.…”

Section: Resultsmentioning

confidence: 99%

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Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Pappenreiter

Zwirtmayr

Mauerhofer³

et al. 2019

Engineering in Life Sciences

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Cultivation of methanogens under high pressure offers a great opportunity in biotechnological processes, one of which is the improvement of the gas‐liquid transfer of substrate gases into the medium broth. This article describes a newly developed simultaneous bioreactor system consisting of four identical cultivation vessels suitable for investigation of microbial activity at pressures up to 50 bar and temperatures up to 145°C. Initial pressure studies at 10 and 50 bar of the autotrophic and hydrogenotrophic methanogens Methanothermobacter marburgensis, Methanobacterium palustre, and Methanobacterium thermaggregans were performed to evaluate the reproducibility of the system as well as to test the productivity of these strains. The strains were compared with respect to gas conversion (%), methane evolution rate (MER) (mmol L‐1 h−1), turnover rate (h−1), and maximum conversion rate (kmin) (bar h−1). A pressure drop that can be explained by the reaction stoichiometry showed that all tested strains were active under pressurized conditions. Our study sheds light on the production kinetics of methanogenic strains under high‐pressure conditions. In addition, the simultaneous bioreactor system is a suitable first step screening system for analyzing the substrate uptake and/or production kinetics of gas conversion and/or gas production processes for barophilic or barotolerant microbes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Pappenreiter

Zwirtmayr

Mauerhofer³

et al. 2019

Engineering in Life Sciences

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“…Thus, the affinity of internal cellulose and hemicellulose of WW to hydrolase was relative weak. Maintaining the pH close to neutral (6.8-7.2) is preferable for methanogenesis, whereas the optimal pH for hydrolysis and acidogenesis is within the range of 5.5-6.5 [17,18]. At the initial stage of digestion, the accumulation of organic acids produced by hydrolysis and acidogenesis was difficult due to the low affinity of wood chips to hydrolase, thus the system pH cannot be lowered (Figure 1c).…”

Section: Discussionmentioning

confidence: 99%

Evaluation on the Methane Production Potential of Wood Waste Pretreated with NaOH and Co-Digested with Pig Manure

Tan

Zhao

et al. 2019

Catalysts

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Wood waste generated during the tree felling and processing is a rich, green, and renewable lignocellulosic biomass. However, an effective method to apply wood waste in anaerobic digestion is lacking. The high carbon to nitrogen (C/N) ratio and rich lignin content of wood waste are the major limiting factors for high biogas production. NaOH pre-treatment for lignocellulosic biomass is a promising approach to weaken the adverse effect of complex crystalline cellulosic structure on biogas production in anaerobic digestion, and the synergistic integration of lignocellulosic biomass with low C/N ratio biomass in anaerobic digestion is a logical option to balance the excessive C/N ratio. Here, we assessed the improvement of methane production of wood waste in anaerobic digestion by NaOH pretreatment, co-digestion technique, and their combination. The results showed that the methane yield of the single digestion of wood waste was increased by 38.5% after NaOH pretreatment compared with the untreated wood waste. The methane production of the co-digestion of wood waste and pig manure was higher than that of the single digestion of wood waste and had nonsignificant difference with the single-digestion of pig manure. The methane yield of the co-digestion of wood waste pretreated with NaOH and pig manure was increased by 75.8% than that of the untreated wood waste. The findings indicated that wood waste as a sustainable biomass source has considerable potential to achieve high biogas production in anaerobic digestion.

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“…Biogas has pressure under ambient air, while the maximum biogas pressure can reach 10 mbar above atmospheric pressure. 19 Barriers while using biogas, the majority of respondents answered biogas can not be used on certain days because it coincides with the holiday, which is accompanied by the cessation of the process of making tofu so that no liquid waste is produced and the biogas does not produce. Nevertheless, the community claimed to be happy with the provision of biogas as a sign of compensation from the owner of the tofu industry to the community.…”

Section: ) Utilization Of Biogasmentioning

confidence: 99%

Evaluation of Sustainable Impacts on Wastewater Treatment of Tofu Industry

Wardani¹,

Utomo²,

Kusnoputranto³

2020

Proceedings of the Proceedings of the 1st International Conference on Environmental Science and Sustainable Development, ICESSD

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Currently, tofu wastewaters from CV. Proma has been treated using anaerobic technology up-flow Fixed Bed reactor. The aim of the research is to evaluate three impacts (environmental, social, and economic) of sustainability on wastewater treatment at CV. Proma tofu industry. This research method was conducted using direct observation in the field and interviewing to community. The evaluation environmental results show that technology can be reducing organic materials in wastewater up to 83% and reducing 2.863.981,8 kg of CH4 emission/years. The evaluation social and economic result show that the technology can be produced biogas equivalent to 5903 kg of LPG/years, which is able to meet the cooking needs of 40 households. Community perceptions show a positive impact because these activities provide economic benefits around Rp. 35.418.169/years for the community around the tofu industry. Wastewater treatment technology in Proma tofu industry can be integrate the three dimensions of sustainability.

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Effects of high-pressure anaerobic digestion up to 30 bar on pH-value, production kinetics and specific methane yield

Cited by 40 publications

References 23 publications

Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Evaluation on the Methane Production Potential of Wood Waste Pretreated with NaOH and Co-Digested with Pig Manure

Evaluation of Sustainable Impacts on Wastewater Treatment of Tofu Industry

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