Heimann A, Jakobsen R, Blodau C (2010) Energetic constrains on H 2-Dependent terminal electron accepting processes in anoxic environments: a review of observations and model approaches. Heimann AC, Blodau C, Postma D, Larsen F, Viet PH, Nhan PQ (2007b) H 2-thresholds and steady-state concentrations associated with microbial arsenate respiration. Heimann AC, Friis AK, Scheutz C, Jakobsen R (2007a) Dynamics of reductive TCE dechlorination in two distinct H 2 supply scenarios and at various temperatures. Env Sci Technol 42(22):8478–8585įennell DE, Gossett JM, Zinder SH (1997) Comparison of butyric acid, ethanol, lactic acid, and propionic acid as hydrogen donors for the reductive dechlorination of tetrachloroethene. Biotech Bioeng 56(6):626–634įaybishenko B, Hazen TC, Long PE, Brodie EL et al (2008) In situ long-term reductive bioimmobilization of Cr(VI) in groundwater using hydrogen release compound. Archv Microbiol 149(4):350–357Ĭord-Ruwisch R, Mercz TI, Hoh C-Y, Strong GE (1997) Dissolved hydrogen concentration as an on-line parameter for the automated operation and optimization of anaerobic digesters. Arch Microbiol 155(1):94–98Ĭord-Ruwisch R, Seitz H-J, Conrad R (1988) The capacity of hydrogenotrophic anaerobic bacteria to compete for traces of hydrogen depends on the redox potential of the terminal electron acceptor. Microbiol Mol Biol Rev 60(4):609–640Ĭonrad R, Wetter B (1990) Influence of temperature on energetics of hydrogen metabolism in homoacetogenic, methanogenic, and other anaerobic bacteria. Environ Sci Technol 30(12):3565–3569Ĭonrad R (1996) Soil microorganisms as controllers of atmospheric trace gases (H 2, CO 2, CH 4, OCS, N 2O, and NO). J Bacteriol 95(3):811–815Ĭhapelle FH, Haack SK, Adriaens P, Henry MA, Bradley PM (1996) Comparison of E h and H 2 measurements for delineating redox processes in a contaminated aquifer. Anal Biochem 78:248–254īrock TD, Brock ML (1968) Measurement of steady-state growth rates of a thermophilic alga directly in nature. Wat Sci Technol 75(8):1753–1760īradford MM (1976) A rapid and sensitive method for quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Process Biochem 43:161–168īoltz JP, Smets BF, Rittmann BE et al (2017) From biofilm ecology to reactors: a focused review. Essential requirements to conduct microbiological H 2 threshold experiments are to have vigorous mixing, large gas-to-liquid volume, large interfacial area, and low initial biomass concentration.Īulenta F, Beccari M, Majone M, Papini MP, Tandoi V (2008) Competition for H 2 between sulfate reduction and dechlorination in butyrate-fed anaerobic cultures. The findings indicate that some of the previously reported H 2-thresholds most likely were over-estimates due to slow gas-to-liquid H 2 transfer. Direct measurements of the liquid-phase H 2 concentration by an in situ probe demonstrated the problems associated with slow H 2 transfer in past H 2 threshold studies. As a result, the liquid-phase H 2 concentration remained much lower than the liquid-phase H 2 concentration that would be in equilibrium with the gas-phase H 2 concentration. The results illustrate that slow mixing reduced the gas-to-liquid H 2 transfer rate, which fell behind the rate of microbiological H 2 consumption in the liquid phase. to assess effects of H 2 mass transfer on microbiological H 2-threshold studies. Microbiological H 2-consumption experiments were conducted with Methanobacterium bryantii M.o.H. The experimental results were simulated by mathematical models to find best-fit values of volumetric mass transfer coefficients-k La-for H 2, which were 1.6/day for no mixing, 7/day for 100 rpm, and 30/day for 200 rpm. H 2 transfer was quantified in real-time with a H 2 microsensor for no mixing, moderate mixing, and rapid mixing (200 rpm). Gas-to-liquid mass transfer of hydrogen (H 2) was investigated in a gas–liquid reactor with a continuous gas phase, a batch liquid phase, and liquid mixing regimes relevant to assessing kinetics of microbial H 2 consumption.
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