Can two-stage instead of one-stage anaerobic digestion really increase energy recovery from biomass?

Schievano, Andrea; Tenca, A.; Lonati, S.; Manzini, Ester; Adani, Fabrizio

doi:10.1016/j.apenergy.2014.03.024

Cited by 157 publications

(63 citation statements)

References 15 publications

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“…3). This result was also confirmed by a previous study [41]. However, in the integration of the HTL and fermentation process, the solid residue from HTL contributed to the largest fraction of the total R carbon and R energy (Fig.…”

Section: Resultssupporting

confidence: 90%

Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Zhu

et al. 2016

Biotechnol Biofuels

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BackgroundBiohythane production via two-stage fermentation is a promising direction for sustainable energy recovery from lignocellulosic biomass. However, the utilization of lignocellulosic biomass suffers from specific natural recalcitrance. Hydrothermal liquefaction (HTL) is an emerging technology for the liquefaction of biomass, but there are still several challenges for the coupling of HTL and two-stage fermentation. One particular challenge is the limited efficiency of fermentation reactors at a high solid content of the treated feedstock. Another is the conversion of potential inhibitors during fermentation. Here, we report a novel strategy for the continuous production of biohythane from cornstalk through the integration of HTL and two-stage fermentation. Cornstalk was converted to solid and liquid via HTL, and the resulting liquid could be subsequently fed into the two-stage fermentation systems. The systems consisted of two typical high-rate reactors: an upflow anaerobic sludge blanket (UASB) and a packed bed reactor (PBR). The liquid could be efficiently converted into biohythane via the UASB and PBR with a high density of microbes at a high organic loading rate.ResultsBiohydrogen production decreased from 2.34 L/L/day in UASB (1.01 L/L/day in PBR) to 0 L/L/day as the organic loading rate (OLR) of the HTL liquid products increased to 16 g/L/day. The methane production rate achieved a value of 2.53 (UASB) and 2.54 L/L/day (PBR), respectively. The energy and carbon recovery of the integrated HTL and biohythane fermentation system reached up to 79.0 and 67.7%, respectively. The fermentation inhibitors, i.e., 5-hydroxymethyl furfural (41.4–41.9% of the initial quantity detected) and furfural (74.7–85.0% of the initial quantity detected), were degraded during hydrogen fermentation. Compared with single-stage fermentation, the methane process during two-stage fermentation had a more efficient methane production rate, acetogenesis, and COD removal. The microbial distribution via Illumina MiSeq sequencing clarified that the biohydrogen process in the two-stage systems functioned not only for biohydrogen production, but also for the degradation of potential inhibitors. The higher distribution of the detoxification family Clostridiaceae, Bacillaceae, and Pseudomonadaceae was found in the biohydrogen process. In addition, a higher distribution of acetate-oxidizing bacteria (Spirochaetaceae) was observed in the biomethane process of the two-stage systems, revealing improved acetogenesis accompanied with an efficient conversion of acetate.ConclusionsBiohythane production could be a promising process for the recovery of energy and degradation of organic compounds from hydrothermal liquefied biomass. The two-stage process not only contributed to the improved quality of the gas fuels but also strengthened the biotransformation process, which resulted from the function of detoxification during biohydrogen production and enhanced acetogenesis during biomethane production.Electronic supplementary materialThe online versio...

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Section: Resultssupporting

confidence: 90%

Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Zhu

et al. 2016

Biotechnol Biofuels

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“…For the others, see Section 2. and Hyd activity and change proton F O F 1 -ATPase, as shown with E. coli [25,31]. These results are of interest too, since E. coli has been recently used in the mixed culture with R. sphaeroides to develop H 2 production biotechnology [37] or two stage technology with these bacteria developed instead of one [2,38] for which effects of heavy metals and their mixtures might be considered as optimization strategy for enhanced biohydrogen production. Furthermore, effects of metal ions and their mixtures supplemented into the growth medium to obtain bacterial biomass and to increase H 2 production will be studied while using different substrates or wastes and at different pHs.…”

Section: H 2 Production By E Coli In the Presence Of Various Heavy Mmentioning

confidence: 79%

Optimizing strategy for Escherichia coli growth and hydrogen production during glycerol fermentation in batch culture: Effects of some heavy metal ions and their mixtures

2016

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“…In this respect, it is of interest that lab-scale two-stage anaerobic digestion should be more productive than one-stage process for H 2 production (see Fig. 6) and will recover more energy from biomass [119].…”

Section: Concluding Remarks and Perspectives For Developing Effectivementioning

confidence: 99%

Hydrogen production from glycerol by Escherichia coli and other bacteria: An overview and perspectives

Trchounian

Trchоunian

2015

Applied Energy

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Can two-stage instead of one-stage anaerobic digestion really increase energy recovery from biomass?

Cited by 157 publications

References 15 publications

Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Optimizing strategy for Escherichia coli growth and hydrogen production during glycerol fermentation in batch culture: Effects of some heavy metal ions and their mixtures

Hydrogen production from glycerol by Escherichia coli and other bacteria: An overview and perspectives

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