Different mixing modes for biogas plants using energy crops

Kowalczyk, Alexandra; Harnisch, Eva; Schwede, Sebastian; Gerber, Mandy; Span, Roland

doi:10.1016/j.apenergy.2013.03.065

Cited by 73 publications

(23 citation statements)

References 13 publications

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“…Continuous and intermittent mixing were also investigated and compared by Kowalczyk et al [5] in a digester co-digesting cow manure with energy crops. The authors determined energy savings up to 29 % with intermittent mixing compared to continuous mixing, whilst similar digestion efficiencies were maintained.…”

Section: Overview Of Mixing In Biogas Digestersmentioning

confidence: 99%

Mixing in Biogas Digesters and Development of an Artificial Substrate for Laboratory‐Scale Mixing Optimization

et al. 2016

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The current state of the art in mixing of biogas digesters is described and the areas where future research needs to be concentrated are outlined. Since mixing is the biggest contributor to energy consumption in digesters, it is important to optimize it in order to improve the overall cost-effectiveness of biodigestion. This optimization problem is a large-scale nonlinear mixed-integer problem with many decision variables. Also, an artificial substrate for lab-scale experimental studies on digester mixing is introduced. This artificial substrate has several properties crucial for the task like rheological behavior which allows for transferring the results of the labscale experiments to full scale, transparency to observe flow patterns, and thus, quantify the degree of mixing, stability preventing the substrate to change its rheological properties over time, and lack of any health hazards

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Section: Overview Of Mixing In Biogas Digestersmentioning

confidence: 99%

Mixing in Biogas Digesters and Development of an Artificial Substrate for Laboratory‐Scale Mixing Optimization

et al. 2016

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“…Converting organic matter to biomethane is always done in anaerobic digesters, in which materials are usually mixed using mechanical agitation (Ghanimeh et al, 2012;Kowalczyk et al, 2013). Different kinds of agitation intensity (or stirring rate) (Gómez et al, 2006;Hoffmann et al, 2008;Stafford, 1982) and agitation durations (or interval) (Cubas et al, 2011;Kowalczyk et al, 2013;Lindmark et al, 2014a) were applied in anaerobic digestion processes.…”

Section: Introductionmentioning

confidence: 99%

“…Different kinds of agitation intensity (or stirring rate) (Gómez et al, 2006;Hoffmann et al, 2008;Stafford, 1982) and agitation durations (or interval) (Cubas et al, 2011;Kowalczyk et al, 2013;Lindmark et al, 2014a) were applied in anaerobic digestion processes. The effects of different intensities or intervals on biogas production are always different because conditions such as substrate, loading concentration or temperature are not same.…”

Section: Introductionmentioning

confidence: 99%

Identifying proper agitation interval to prevent floating layers formation of corn stover and improve biogas production in anaerobic digestion

Tian

Zou

Yuan

et al. 2015

Bioresource Technology

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“…Moreover, the stirring is responsible for up to 54% of the power consumption of current biogas plants, and it has been recommended as a possibility to operate biogas Brought to you by | MIT Libraries Authenticated Download Date | 5/11/18 9:03 AM plants more efficiently to reduce the energy consumption by avoiding constant stirring [20].…”

Section: Performance Analysis Of Cstrmentioning

confidence: 99%

“…Enhanced performance of the FFR is due to enhancement in the bacterial activities, as because of the fixed film conditions, the anaerobic microbes are retained for a longer duration in the substrate, and the fixed film does not allow them to wash out through the outlet of the reactor. The layering of microorganisms for non-stirred digesters was investigated by Alexandra et al [20]. In the first case, the digester was not stirred for a period of 24 h, and in the second case, the digester was not stirred for a period of 2 months to investigate the effect of layering of microorganisms in the digesting substrate.…”

Section: Performance Analysis Of Ffrmentioning

confidence: 99%

Performance evaluation of various bioreactors for methane fermentation of pretreated wheat straw with cattle manure

Krishania

Vijay

Chandra

2016

Green Processing and Synthesis

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This paper examines the performance results of configured semi-continuous mesophilic bioreactors for methane fermentation of pretreated wheat straw codigested with cattle manure. The semi-continuous process was carried out in three different types of bioreactors, i.e. continuous stirred tank reactor (CSTR), fixed film reactor (FFR), and conventional floating drum reactor (CR), with an organic loading rate of 2.2 kg of volatile solids (VS)/ day. The observed results revealed that the configuration of the FFR increased the methane production yield by 41.1%. However, the configuration of the CSTR had only a marginal effect on enhancement of methane production yield (yield increased only by 10.6%) compared to the CR. The VS removal for digesters did not vary much at the same organic loading rate. The study revealed that the pretreated wheat straw with the FFR had yield methane production of 0.342 m 3 /kg VS, whereas the CSTR and CR had yield methane production of 0.289 m 3 /kg VS and 0.264 m 3 /kg VS, respectively.

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Different mixing modes for biogas plants using energy crops

Cited by 73 publications

References 13 publications

Mixing in Biogas Digesters and Development of an Artificial Substrate for Laboratory‐Scale Mixing Optimization

Mixing in Biogas Digesters and Development of an Artificial Substrate for Laboratory‐Scale Mixing Optimization

Identifying proper agitation interval to prevent floating layers formation of corn stover and improve biogas production in anaerobic digestion

Performance evaluation of various bioreactors for methane fermentation of pretreated wheat straw with cattle manure

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