Effects of Organic Loading Rate on the Performance of a Pressurized Anaerobic Filter in Two-Phase Anaerobic Digestion

Chen, Yuling; Rößler, Benjamin; Zielonka, Simon; Wonneberger, A.-M.; Lemmer, Andreas

doi:10.3390/en7020736

Cited by 42 publications

(37 citation statements)

References 16 publications

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“…An HRT of 3 d has been suggested [21], and Chen et al [28] determined an efficient and smooth operation of a biogas system using an HRT of 1.8 d (OLR 12.5 kg/m 3 /day). In contrast to the HRT, the OLR of Chen et al is approximately 10 times higher than that of this investigation (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

2017

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Biogas plants are the most complex systems and are heavily studied in the field of renewable energy. A biogas system is mainly influenced by biological and technical parameters that strongly interact with each other. One recommended practice when operating a biogas plant is the recirculation of the substrate from the second fermenter into the first fermenter, which extends the recirculation amount (RA) and, in turn, the recirculation rate (RR). This technique should be applied to support and secure the biogas process. In this investigation, the RA was varied, starting with the recommended "best practice" of 10.0 m 3 /d (RR 40%). Every ten days, the RA was reduced in steps of 1.5 m 3 /d, with 5.5 m 3 /d (RR 27%) being the final value. The basic question to be addressed concerns to what extent the RR influences the methane yield and thereby influence the efficiency of a manure-based biogas plant in practice. Diverting the "best practice" to a RR of 27% stabilised the fermentation process and lead to significantly higher methane yields with smaller standard deviations. In addition, with a reduced RR, the standard optimal acid concentration within the biogas substrate was approximately reached.

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Section: Resultsmentioning

confidence: 99%

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

2017

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“…In addition, disturbances of microbial communities occur when there is a sudden change in OLR . Theoretically, OLRs should be consistent to avoid disturbances to microbial communities and process instability.…”

Section: Introductionmentioning

confidence: 99%

Effects of organic loading rates on microbial communities and biogas production from water hyacinth: a case of mono‐ and co‐digestion

Nkuna

Roopnarain

Adeleke

2019

J of Chemical Tech & Biotech

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Background Anaerobic digestion is a microbial driven process, which results in biogas production. Although important, the relative abundance of microbial communities can be affected by disturbances such as feeding rates. In this study, the effects of irregular organic loading rates on anaerobic digestion of water hyacinth (mono‐ and co‐digestion) as well as on bacterial and archaeal communities were investigated. The process was conducted at different feeding stages during which the process stability, biogas production, composition and microbial community structure were monitored. Results Bacterial communities were more influenced by irregular organic loading rates in comparison with archaeal communities. Although microbial community shifts were observed in both mono‐ and co‐digestion, the shift was more prevalent in co‐digestion. Moreover, process stability was evidenced in some stages of mono‐digestion, where the FOS/TAC ratio was within the optimal range. However, for co‐digestion, the low FOS/TAC ratio showed process instability. Conclusion Overall, irregularity in organic loading rates affected the microbial community composition as well as their CH4 production. © 2018 Society of Chemical Industry

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“…For a conventional anaerobic digestion, the optimal pH range is recommended to be between 6.8 and 7.4 [15]. The process performance tends to be negatively affected at a low pH value [16]. In addition, as pH value decreases, the carbonic acid equilibrium is shifted to gaseous carbon dioxide and more carbon dioxide is released to the gas phase [17].…”

Section: Introductionmentioning

confidence: 99%

Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process

et al. 2015

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Two-stage pressurized anaerobic digestion is a promising technology. This technology integrates in one process biogas production with upgrading and pressure boosting for grid injection. To investigate whether the efficiency of this novel system could be further increased, a water scrubbing system was integrated into the methanogensis step. Therefore, six leach-bed reactors were used for hydrolysis/acidification and a 30-L pressurized anaerobic filter operated at 9 bar was adopted for acetogenesis/methanogenesis. The fermentation liquid of the pressurized anaerobic filter was circulated periodically via a flash tank, operating at atmospheric pressure. Due to the pressure drop, part of dissolved carbon dioxide was released from the liquid phase into the flash tank. The depressurized fermentation liquid was then recycled to the pressurized reactor. Three different flow rates (0 L·day 87 mol%. The pH value of the substrate in the methane reactor rose simultaneously from 6.5 to 6.7. The experimental data were verified by calculation.

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Effects of Organic Loading Rate on the Performance of a Pressurized Anaerobic Filter in Two-Phase Anaerobic Digestion

Cited by 42 publications

References 16 publications

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

Effects of organic loading rates on microbial communities and biogas production from water hyacinth: a case of mono‐ and co‐digestion

Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process

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