Optimization of hydrogen dispersion in thermophilic up-flow reactors for ex situ biogas upgrading

Ilaria Bassani; Panagiotis Kougias; Laura Treu; Hugo Porte; Stefano Campanaro; Irini Angelidaki

doi:10.1016/j.biortech.2017.03.055

Optimization of hydrogen dispersion in thermophilic up-flow reactors for ex situ biogas upgrading

Ilaria Bassani, Panagiotis Kougias, Laura Treu, Hugo Porte, Stefano Campanaro, Irini Angelidaki

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

This study evaluates the efficiency of four novel up-flow reactors for ex situ biogas upgrading converting externally provided CO2 and H2 to CH4, via hydrogenotrophic methanogenesis. The gases were injected through stainless steel diffusers combined with alumina ceramic sponge or through alumina ceramic membranes. Pore size, input gas loading and gas recirculation flow rate were modulated to optimize gas-liquid mass transfer, and thus methanation efficiency. Results showed that larger pore size diffusion devices achieved the best kinetics and output-gas quality converting all the injected H2 and CO2, up to 3.6L/LREACTOR·d H2 loading rate. Specifically, reactors' CH4 content increased from 23 to 96% and the CH4 yield reached 0.25LCH4/LH2. High throughput 16S rRNA gene sequencing revealed predominance of bacteria belonging to Anaerobaculum genus and to uncultured order MBA08. Additionally, the massive increase of hydrogenotrophic methanogens, such as Methanothermobacter thermautotrophicus, and syntrophic bacteria demonstrates the selection-effect of H2 on community composition.

Original language	English
Journal	Bioresource Technology
Volume	234
Pages (from-to)	310-319
Number of pages	10
ISSN	0960-8524
DOIs	https://doi.org/10.1016/j.biortech.2017.03.055
Publication status	Published - 2017

Keywords

16S rRNA gene sequencing
Ceramic membrane
Ceramic sponge
Ex situ biogas upgrading
Gas-liquid mass transfer rate

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title = "Optimization of hydrogen dispersion in thermophilic up-flow reactors for ex situ biogas upgrading",

abstract = "This study evaluates the efficiency of four novel up-flow reactors for ex situ biogas upgrading converting externally provided CO2 and H2 to CH4, via hydrogenotrophic methanogenesis. The gases were injected through stainless steel diffusers combined with alumina ceramic sponge or through alumina ceramic membranes. Pore size, input gas loading and gas recirculation flow rate were modulated to optimize gas-liquid mass transfer, and thus methanation efficiency. Results showed that larger pore size diffusion devices achieved the best kinetics and output-gas quality converting all the injected H2 and CO2, up to 3.6L/LREACTOR·d H2 loading rate. Specifically, reactors' CH4 content increased from 23 to 96% and the CH4 yield reached 0.25LCH4/LH2. High throughput 16S rRNA gene sequencing revealed predominance of bacteria belonging to Anaerobaculum genus and to uncultured order MBA08. Additionally, the massive increase of hydrogenotrophic methanogens, such as Methanothermobacter thermautotrophicus, and syntrophic bacteria demonstrates the selection-effect of H2 on community composition.",

keywords = "16S rRNA gene sequencing, Ceramic membrane, Ceramic sponge, Ex situ biogas upgrading, Gas-liquid mass transfer rate",

author = "Ilaria Bassani and Panagiotis Kougias and Laura Treu and Hugo Porte and Stefano Campanaro and Irini Angelidaki",

year = "2017",

doi = "10.1016/j.biortech.2017.03.055",

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T1 - Optimization of hydrogen dispersion in thermophilic up-flow reactors for ex situ biogas upgrading

AU - Bassani, Ilaria

AU - Kougias, Panagiotis

AU - Treu, Laura

AU - Porte, Hugo

AU - Campanaro, Stefano

AU - Angelidaki, Irini

PY - 2017

Y1 - 2017

N2 - This study evaluates the efficiency of four novel up-flow reactors for ex situ biogas upgrading converting externally provided CO2 and H2 to CH4, via hydrogenotrophic methanogenesis. The gases were injected through stainless steel diffusers combined with alumina ceramic sponge or through alumina ceramic membranes. Pore size, input gas loading and gas recirculation flow rate were modulated to optimize gas-liquid mass transfer, and thus methanation efficiency. Results showed that larger pore size diffusion devices achieved the best kinetics and output-gas quality converting all the injected H2 and CO2, up to 3.6L/LREACTOR·d H2 loading rate. Specifically, reactors' CH4 content increased from 23 to 96% and the CH4 yield reached 0.25LCH4/LH2. High throughput 16S rRNA gene sequencing revealed predominance of bacteria belonging to Anaerobaculum genus and to uncultured order MBA08. Additionally, the massive increase of hydrogenotrophic methanogens, such as Methanothermobacter thermautotrophicus, and syntrophic bacteria demonstrates the selection-effect of H2 on community composition.

AB - This study evaluates the efficiency of four novel up-flow reactors for ex situ biogas upgrading converting externally provided CO2 and H2 to CH4, via hydrogenotrophic methanogenesis. The gases were injected through stainless steel diffusers combined with alumina ceramic sponge or through alumina ceramic membranes. Pore size, input gas loading and gas recirculation flow rate were modulated to optimize gas-liquid mass transfer, and thus methanation efficiency. Results showed that larger pore size diffusion devices achieved the best kinetics and output-gas quality converting all the injected H2 and CO2, up to 3.6L/LREACTOR·d H2 loading rate. Specifically, reactors' CH4 content increased from 23 to 96% and the CH4 yield reached 0.25LCH4/LH2. High throughput 16S rRNA gene sequencing revealed predominance of bacteria belonging to Anaerobaculum genus and to uncultured order MBA08. Additionally, the massive increase of hydrogenotrophic methanogens, such as Methanothermobacter thermautotrophicus, and syntrophic bacteria demonstrates the selection-effect of H2 on community composition.

KW - 16S rRNA gene sequencing

KW - Ceramic membrane

KW - Ceramic sponge

KW - Ex situ biogas upgrading

KW - Gas-liquid mass transfer rate

U2 - 10.1016/j.biortech.2017.03.055

DO - 10.1016/j.biortech.2017.03.055

M3 - Journal article

C2 - 28340435

SN - 0960-8524

VL - 234

SP - 310

EP - 319

JO - Bioresource Technology

JF - Bioresource Technology

ER -

Optimization of hydrogen dispersion in thermophilic up-flow reactors for ex situ biogas upgrading

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Keywords

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