Effect of low pH on the activity of hydrogen utilizing methanogen in bio-hydrogen process

Kim, In Soo; Hwang, Moon Hyun; Jang, Nam J.; Hyun, S.H.; Lee, S.T.

doi:10.1016/j.ijhydene.2003.08.017

Cited by 91 publications

(69 citation statements)

References 18 publications

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“…This value was close to that obtained by Kim et al (2004), which provided better conditions for the production of this metabolite. Table 1 shows that the production of SMP tended to increase when the HRT was reduced from 8 h to 2 h or when the OLR was increased from 28 kg COD/m (Table 1).…”

Section: Composition Of Soluble Productssupporting

confidence: 88%

“…The butyric acid production at an HRT of 1 h was 267.71 mg/L (3.04 mM), corresponding to 66.78% of the SMP. Kim et al (2004), using a semi-continuous reactor, concluded that butyric acid production is favored when the pH is approximately 4.5-5. However, when the reactor is operated at a long enough HRT to grow methanogenic microorganisms, methanogenic activity cannot be completely inhibited by acidic conditions (pH of approximately 4.5).…”

Section: Composition Of Soluble Productsmentioning

confidence: 99%

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Biohydrogen production from cassava wastewater in an anaerobic fluidized bed reactor

Amorim

Alves

Martins

et al. 2014

Braz. J. Chem. Eng.

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-The effect of hydraulic retention time (HRT) and organic loading rate (OLR) on biological hydrogen production was assessed using an anaerobic fluidized bed reactor fed with cassava wastewater. The HRT of this reactor ranged from 8 to 1 h (28 to 161 kg COD/m 3 -d). The inoculum was obtained from a facultative pond sludge derived from swine wastewater treatment. The effluent pH was approximately 5.00, while the influent chemical oxygen demand (COD) measured 4000 mg COD/L. The hydrogen yield production increased from 0.13 to 1.91 mol H 2 /mol glucose as the HRT decreased from 8 to 2 h. The hydrogen production rate significantly increased from 0.20 to 2.04 L/h/L when the HRT decreased from 8 to 1 h. The main soluble metabolites were ethanol (1.87-100%), acetic acid (0.00-84.80%), butyric acid (0.00-66.78%) and propionic acid (0.00-50.14%). Overall, we conclude that the best hydrogen yield production was obtained at an HRT of 2 h.

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Section: Composition Of Soluble Productssupporting

confidence: 88%

Section: Composition Of Soluble Productsmentioning

confidence: 99%

Biohydrogen production from cassava wastewater in an anaerobic fluidized bed reactor

Amorim

Alves

Martins

et al. 2014

Braz. J. Chem. Eng.

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show abstract

“…In contrast to the enrichment of the Sulfolobales, members of the methanogens showed a positive correlation of abundance with increasing pH. It is generally believed that a pH below 5 can inhibit the methanogenic activity in anaerobic biological systems (Kim et al, 2004), but all samples included in the archaeal correlation analysis had a pH below 3.5. Their presence in these systems may be attributed to microhabitats provided by other microorganisms.…”

Section: Discussionmentioning

confidence: 85%

Microbial Community Structures of Novel Icelandic Hot Spring Systems Revealed by PhyloChip G3 Analysis

et al. 2014

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Microbial community profiles of recently formed hot spring systems ranging in temperatures from 57°C to 100°C and pH values from 2 to 4 in Hverager+i (Iceland) were analyzed with PhyloChip G3 technology. In total, 1173 bacterial operational taxonomic units (OTUs) spanning 576 subfamilies and 38 archaeal OTUs covering 32 subfamilies were observed. As expected, the hyperthermophilic (*100°C) spring system exhibited both low microbial biomass and diversity when compared to thermophilic (*60°C) springs. Ordination analysis revealed distinct bacterial and archaeal diversity in geographically distinct hot springs. Slight variations in temperature (from 57°C to 64°C) within the interconnected pools led to a marked fluctuation in microbial abundance and diversity. Correlation and PERMANOVA tests provided evidence that temperature was the key environmental factor responsible for microbial community dynamics, while pH, H 2 S, and SO 2 influenced the abundance of specific microbial groups. When archaeal community composition was analyzed, the majority of detected OTUs correlated negatively with temperature, and few correlated positively with pH.

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“…It was reported that methanogens were inhibited at pH lower than 6 for hydrogen production from waste sludge and HSW in both lab-scale and pilot-scale systems (Han et al, 2005;Lay et al, 1999). In a continuously stirred tank reactor (CSTR) system, Kim et al (2004) reported that short HRT (<3 days) would favor hydrogen production as methanogens require more than approx. 3 days HRT before they are washed out from a CSTR reactor.…”

Section: Introductionmentioning

confidence: 99%

Effects of pH and hydraulic retention time on hydrogen production versus methanogenesis during anaerobic fermentation of organic household solid waste under extreme‐thermophilic temperature (70°C)

Liu

Zeng

Angelidaki

2008

Biotech & Bioengineering

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Two continuously stirred tank reactors were operated with household solid waste at 70 degrees C, for hydrogen and methane production. The individual effect of hydraulic retention time (HRT as 1, 2, 3, 4, and 6 days) at pH 7 or pH (5, 5.5, 6, 6.5, 7) at 3-day HRT was investigated on the hydrogen production versus methanogenesis. It was found that at pH 7, the maximum hydrogen yield was 107 mL-H(2)/g VS(added) (volatile solid added) but no stable hydrogen production was obtained as after some time methanogenesis was initiated at all tested HRTs. This demonstrated that sludge retention time alone was not enough for washing out the methanogens at pH 7 under extreme-thermophilic conditions. Oppositely, we showed that keeping the pH level at 5.5 was enough to inhibit methane and produce hydrogen stably at 3-day HRT. However, the maximum stable hydrogen yield was low at 21 mL-H(2)/g VS(added).

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Effect of low pH on the activity of hydrogen utilizing methanogen in bio-hydrogen process

Cited by 91 publications

References 18 publications

Biohydrogen production from cassava wastewater in an anaerobic fluidized bed reactor

Biohydrogen production from cassava wastewater in an anaerobic fluidized bed reactor

Microbial Community Structures of Novel Icelandic Hot Spring Systems Revealed by PhyloChip G3 Analysis

Effects of pH and hydraulic retention time on hydrogen production versus methanogenesis during anaerobic fermentation of organic household solid waste under extreme‐thermophilic temperature (70°C)

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