Lactic Acid Bacteria in Hydrogen-Producing Consortia: On Purpose or by Coincidence?

Sikora, Anna; Błaszczyk, Mieczysław; Jurkowski, Marcin; Zielenkiewicz, Urszula

doi:10.5772/50364

Cited by 70 publications

(75 citation statements)

References 54 publications

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“…At a low pH, LAB were found to have an inhibitory effect on hydrogen production whereas, at higher pH values, this effect was not observed (Noike et al 2005). However, also positive effects of LAB on hydrogen production are discussed (Chojnacka et al 2011) and the undecided role of LAB in hydrogen-producing consortia was recently reviewed by Sikora et al (2013). If metabolic fluctuations as observed in this study can also occur with nonensiled substrates or other substrates without considerable amounts of LAB needs to be investigated in further experiments.…”

Section: Discussionmentioning

confidence: 89%

“…Clostridia have been extensively studied for their capability to produce hydrogen from various carbohydrates (Lee et al 2011), as it was observed in our system when they became dominant in the gas production periods of the first-phase reactor. LAB have been frequently detected in mesophilic hydrogen-producing consortia as bacteria that accompany hydrogen producers (Sikora et al 2013). Some researchers hold LAB causative for observed process instabilities (Noike et al 2002).…”

Section: Discussionmentioning

confidence: 99%

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Metabolic and microbial community dynamics during the anaerobic digestion of maize silage in a two-phase process

Sträuber

Lucas

Kleinsteuber

2015

Appl Microbiol Biotechnol

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Two-phasic anaerobic digestion processes (hydrolysis/acidogenesis separated from acetogenesis/methanogenesis) can be used for biogas production on demand or a combined chemicals/bioenergy production. For an effective process control, detailed knowledge about the microbial catalysts and their correlation to process conditions is crucial. In this study, maize silage was digested in a two-phase process and interrelationships between process parameters and microbial communities were revealed. In the first-phase reactor, alternating metabolic periods were observed which emerged independently from the feeding frequency. During the L-period, up to 11.8 g L(-1) lactic acid was produced which significantly correlated to lactic acid bacteria of the genus Lactobacillus as the most abundant community members. During the alternating G-period, the production of volatile fatty acids (up to 5.3, 4.0 and 3.1 g L(-1) for propionic, n-butyric and n-caproic acid, respectively) dominated accompanied by a high gas production containing up to 28 % hydrogen. The relative abundance of various Clostridiales increased during this metabolic period. In the second-phase reactor, the metabolic fluctuations of the first phase were smoothed out resulting in a stable biogas production as well as stable bacterial and methanogenic communities. However, the biogas composition followed the metabolic dynamics of the first phase: the hydrogen content increased during the L-period whereas highest CH4/CO2 ratios (up to 2.8) were reached during the G-period. Aceticlastic Methanosaeta as well as hydrogenotrophic Methanoculleus and Methanobacteriaceae were identified as dominant methanogens. Consequently, a directed control of the first-phase stabilizing desired metabolic states can lead to an enhanced productivity regarding chemicals and bioenergy.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Metabolic and microbial community dynamics during the anaerobic digestion of maize silage in a two-phase process

Sträuber

Lucas

Kleinsteuber

2015

Appl Microbiol Biotechnol

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“…These authors suggested that the bacteriocin excreted by the lactic acid bacteria reduced or totally inhibited H 2 production by Clostridium. According to the review of Sikora et al (2013) [34], the role played by lactic bacteria during fermentative H 2 production depends on the bioreactor conditions, and attributing a certain function to a particular kind of lactic acid bacteria is impossible.…”

Section: Ph and Soluble Metabolites Concentrationsmentioning

confidence: 99%

Long-term effect of acid and heat pretreatment of sludge from a sugarcane vinasse treatment plant on the microbial community and on thermophilic biohydrogen production

Lamaison

Andrade

Bigaton

et al. 2015

International Journal of Hydrogen Energy

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“…As shown in Table 2, a high amount of propionic acid (3424 mg COD/L) and lactic acid (1230 mg COD/L) was observed in suspended cell systems, which resulted in lower hydrogen production performance than for immobilized cells. In general, these metabolites (propionic acid and lactic acid) are usually considered undesired products during hydrogen fermentation [28][29][30]. The formation of propionic acid is an undesired reaction during hydrogen fermentation because it consumes the produced hydrogen.…”

Section: Soluble Metabolites Distribution and B/ A Ratiomentioning

confidence: 99%

Improved Hydrogen Production from Galactose Via Immobilized Mixed Consortia

Kumar

Sivagurunathan

Park³

et al. 2015

Arab J Sci Eng

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In this study, a combined encapsulation and entrapment immobilization strategy was employed to enhance hydrogen production from sewage sludge containing mixed microbial cultures. The results showed that the hydrogen production rate (HPR) and hydrogen yield (HY) of immobilized cells were significantly higher than that of the suspended cells. The peak HPR and HY of 0.76 L/L-d and 1.20 mol/mol galactose added attained with the immobilized cell system were comparable to that of the suspended cell system (HPR 0.62 L/L-d and HY 0.88 mol/mol galactose added , respectively). The immobilized beads were also found to have efficient hydrogen production upon reuse for more than five cycles, with galactose removal >85 % in all cases. Soluble metabolic product analysis revealed that fermentation followed a butyrate pathway and the major metabolites produced were acetate and butyrate. The peak total energy production rate and yield were 8.6 kJ/L-d and 308 kJ/mol added , respectively.

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Lactic Acid Bacteria in Hydrogen-Producing Consortia: On Purpose or by Coincidence?

Cited by 70 publications

References 54 publications

Metabolic and microbial community dynamics during the anaerobic digestion of maize silage in a two-phase process

Metabolic and microbial community dynamics during the anaerobic digestion of maize silage in a two-phase process

Long-term effect of acid and heat pretreatment of sludge from a sugarcane vinasse treatment plant on the microbial community and on thermophilic biohydrogen production

Improved Hydrogen Production from Galactose Via Immobilized Mixed Consortia

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