Hydrogen permeability of the hollow fibers used in H2-based membrane biofilm reactors

Tang, Youneng; Zhou, Chen; Ginkel, Steven W. Van; Ontiveros‐Valencia, Aura; Shin, Jung H.; Rittmann, Bruce E.

doi:10.1016/j.memsci.2012.03.040

Cited by 94 publications

(89 citation statements)

References 31 publications

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“…The polypropylene fibers have a H 2 permeation coefficient of 0.0014 cm 2 /d. 44 In the other glass tube, we inserted 10 coupon membranes for biomass sampling which were potted on one end; the membrane type was the same as for the main bundle. The MBfR total volume was 60 mL.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Interactions between Nitrate-Reducing and Sulfate-Reducing Bacteria Coexisting in a Hydrogen-Fed Biofilm

Ontiveros‐Valencia

Ziv-El

Zhao

et al. 2012

Environ. Sci. Technol.

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To explore the relationships between denitrifying bacteria (DB) and sulfate-reducing bacteria (SRB) in H(2)-fed biofilms, we used two H(2)-based membrane biofilm reactors (MBfRs) with or without restrictions on H(2) availability. DB and SRB compete for H(2) and space in the biofilm, and sulfate (SO(4)(2-)) reduction should be out-competed when H(2) is limiting inside the biofilm. With H(2) availability restricted, nitrate (NO(3)(-)) reduction was proportional to the H(2) pressure and was complete at a H(2) pressure of 3 atm; SO(4)(2-) reduction began at H(2) ≥ 3.4 atm. Without restriction on H(2) availability, NO(3)(-) was the preferred electron acceptor, and SO(4)(2-) was reduced only when the NO(3)(-) surface loading was ≤ 0.13 g N/m(2)-day. We assayed DB and SRB by quantitative polymerase chain reaction targeting the nitrite reductases and dissimilatory sulfite reductase, respectively. Whereas DB and SRB increased with higher H(2) pressures when H(2) availability was limiting, SRB did not decline with higher NO(3)(-) removal flux when H(2) availability was not limiting, even when SO(4)(2-) reduction was absent. The SRB trend reflects that the SRB's metabolic diversity allowed them to remain in the biofilm whether or not they were reducing SO(4)(2-). In all scenarios tested, the SRB were able to initiate strong SO(4)(2-) reduction only when competition for H(2) inside the biofilm was relieved by nearly complete removal of NO(3)(-).

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Interactions between Nitrate-Reducing and Sulfate-Reducing Bacteria Coexisting in a Hydrogen-Fed Biofilm

Ontiveros‐Valencia

Ziv-El

Zhao

et al. 2012

Environ. Sci. Technol.

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“…This allowed sample collection without disturbing the main bundle of fibers and without causing a significant change in total biofilm surface area in the reactor. The experimental permeability of the polypropylene fiber was 1.8 Â 10 À7 m 3 H 2 $m membrane thickness/m 2 hollow fiber surface area$d$bar at standard temperature and pressure (Tang et al, 2012). For the main fiber bundle, both ends were glued into an H 2 -supply manifold.…”

Section: Mbfr Setupmentioning

confidence: 99%

Uranium removal and microbial community in a H 2 -based membrane biofilm reactor

et al. 2014

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“…The product of the H 2 -diffusion coefficient within the membrane (D m ) and the H 2 solubility within the membrane (k s ) in eq 3 is defined as the H 2 -permeation coefficient within the membrane (symbol P m ); it is a characteristic of a fiber and can be experimentally determined. 46 All dissolved components at the biofilm's outer surface are subject to a consistent-flux boundary condition: A dissolved-component flux through the diffusion layer equals the flux of this dissolved component in or out of the biofilm (eq 4). The transport of dissolved components through the diffusion layer and into or out of the biofilm is described with the resistance approach using Fick's first law.…”

Section: ■ Introductionmentioning

confidence: 99%

A Steady-State Biofilm Model for Simultaneous Reduction of Nitrate and Perchlorate, Part 1: Model Development and Numerical Solution

Tang

Zhao

Marcus

et al. 2012

Environ. Sci. Technol.

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A multispecies biofilm model is developed for simultaneous reduction of nitrate and perchlorate in the H(2)-based membrane biofilm reactor. The one-dimension model includes dual-substrate Monod kinetics for a steady-state biofilm with five solid and five dissolved components. The solid components are autotrophic denitrifying bacteria, autotrophic perchlorate-reducing bacteria, heterotrophic bacteria, inert biomass, and extracellular polymeric substances (EPS). The dissolved components are nitrate, perchlorate, hydrogen (H(2)), substrate-utilization-associated products, and biomass-associated products (BAP). The model explicitly considers four mechanisms involved in how three important operating conditions (H(2) pressure, nitrate loading, and perchlorate loading) affect nitrate and perchlorate removals: (1) competition for H(2), (2) promotion of PRB growth due to having two electron acceptors (nitrate and perchlorate), (3) competition between nitrate and perchlorate reduction for the same resources in the PRB: electrons and possibly reductase enzymes, and (4) competition for space in the biofilm. Two other special features are having H(2) delivered from the membrane substratum and solving directly for steady state using a novel three-step approach: finite-difference for approximating partial differential and/or integral equations, Newton-Raphson for solving nonlinear equations, and an iterative scheme to obtain the steady-state biofilm thickness. An example result illustrates the model's features.

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Hydrogen permeability of the hollow fibers used in H2-based membrane biofilm reactors

Cited by 94 publications

References 31 publications

Interactions between Nitrate-Reducing and Sulfate-Reducing Bacteria Coexisting in a Hydrogen-Fed Biofilm

Interactions between Nitrate-Reducing and Sulfate-Reducing Bacteria Coexisting in a Hydrogen-Fed Biofilm

Uranium removal and microbial community in a H 2 -based membrane biofilm reactor

A Steady-State Biofilm Model for Simultaneous Reduction of Nitrate and Perchlorate, Part 1: Model Development and Numerical Solution

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