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

被引：107

作者：

Bassani, Ilaria ^{[1
]}

Kougias, Panagiotis G. ^{[1
]}

Treu, Laura ^{[1
,2
]}

Porte, Hugo ^{[1
]}

Campanaro, Stefano ^{[3
]}

Angelidaki, Irini ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Environm Engn, Bld 113, DK-2800 Lyngby, Denmark

[2] Univ Padua, Dept Agron Food Nat Resources Anim & Environm DAF, Viale Univ 16, I-35020 Legnaro, PD, Italy

[3] Univ Padua, Dept Biol, Via U Bassi 58-B, I-35121 Padua, Italy

来源：

BIORESOURCE TECHNOLOGY | 2017年 / 234卷

关键词：

Ex situ biogas upgrading; Gas-liquid mass transfer rate; Ceramic sponge; Ceramic membrane; 16S rRNA gene sequencing; MICROBIAL COMMUNITY; ANAEROBIC-DIGESTION; WIND POWER; GAS; ELECTRICITY; ACID; CO2;

D O I：

10.1016/j.biortech.2017.03.055

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

This study evaluates the efficiency of four novel up-flow reactors for ex situ biogas upgrading converting externally provided CO2 and H-2 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 H-2 and CO2, up to 3.6 L/L-REACTOR.d H-2 loading rate. Specifically, reactors' CH4 content increased from 23 to 96% and the CH4 yield reached 0.25 L-CH4/L-H2. 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 H-2 on community composition. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：310 / 319

页数：10

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