4.7 Article

Ex-situ biogas upgrading in thermophilic trickle bed reactors packed with micro-porous packing materials

期刊

CHEMOSPHERE
卷 296, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.133987

关键词

Biogas upgrading; Trickle bed reactors; Gas-liquid mass transfer; Biofilm formation; Hydrogenotrophic methanogenesis

资金

  1. Energi teknologisk Udviklings-og Demonstrations program (EUDP)
  2. Energinet under the ForskEL project [2016-1-12465]

向作者/读者索取更多资源

In this study, two thermophilic trickle bed reactors (TBRs) packed with different packing densities were evaluated for their performance in ex-situ biogas upgrading process. The results showed that densely packed polyurethane foam (PUF) enhanced H-2 utilization efficiency and methane content in the output gas. High-rate nutrient trickling, however, had negative effects on biomethanation efficiency.
Two thermophilic trickle bed reactors (TBRs) were packed with different packing densities with polyurethane foam (PUF) and their performance under different retention times were evaluated during ex-situ biogas upgrading process. The results showed that the TBR more tightly packed i.e. containing more layers of PUF achieved higher H-2 utilization efficiency (>99%) and thus, higher methane content (>95%) in the output gas. The tightly packed micro-porous PUF enhanced biofilm immobilization, gas-liquid mass transfer and biomethanation efficiency. Moreover, applying a continuous high-rate nutrient trickling could lead to liquid overflow resulting in formation of non-homogenous biofilm and severe deduction of biomethanation efficiency. High-throughput 16S rRNA gene sequencing revealed that the liquid media were predominated by hydrogenotrophic methanogens. Moreover, members of Peptococcaceae family and uncultured members of Clostridia class were identified as the most abundant species in the biofilm. The proliferation of hydrogenotrophic methanogens together with syntrophic bacteria showed that H-2 addition resulted in altering the microbial community in biogas upgrading process.

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