Project

Ex-situ biogas upgrading through biologically mediated CO2 reduction

Publisher

Supervisor

Location

Greater Copenhagen area

Background

Recently, promising biologically mediated upgrading systems have been suggested, in which H2 and CO2 are biologically converted to CH4 by the action of autochthonous hydrogenotrophic methanogens without any additional energy input. The concept is independent from the utilization of defined microbial cultures (pure cultures) which require a relatively pure source of CO2. Thus, cheap biogas (~60% CH4, ~40% CO2) is used for biological upgrading. In addition, the concept of adding H2 directly to anaerobic digesters has been validated with CH4 purities as high as 95%. For ex-situ biogas upgrading, a crucial technical challenge that should be addressed is the poor liquid mass transfer and the efficiency of the diffusion devices. As an alternative, traditional fixed-bed reactors have been explored to immobilize microbial communities, but several limitations using fixed- bed were found. For example, bubble formation, low solubility of H2 and limitation in mass transfer and the metabolic rate caused by lack of surface. In this project, we develop innovative biotechnological solutions to upgrade biogas to pure biomethane.

Aim

To design, operate and optimize bio-trickling filter reactors for ex-situ biological biogas upgrading using mixed hydrogenotrophic methanogenic archaea. Bio-trickling filter reactors can offer a high specific area for biofilm growth, high density of biomass and are known for high gas to liquid and gas to biofilm mass transfer coefficients. The bio-trickling filter reactors will be filled with innovative and high porous materials for efficient CO2 and H2 uptake.

Approach

Firstly, the critical velocity of the porous materials will be assessed. Secondly, the bio-trickling filter reactors will be tested to maximize methanation. Co- and contra- flow of gas will be examined in relation to trickling flow. Parameters such as gas retention time will be monitored towards optimization.

eFUEL project 

https://www.dtu.dk/nyheder/Nyhed?id=eba386db-358e-47eb-ae00-d1e872ba310e


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Contact

Company / Organization

DTU Miljø

Name

Irini Angelidaki

Position

Professor

Mail

iria@env.dtu.dk

Supervisor info

MSc in Biotechnology

Supervisor

Irini Angelidaki

Co-supervisors

Panagiotis Tsapekos

ECTS credits

30

Type

MSc thesis, Special course

Must be completed

MSc thesis, Special course

MSc in Environmental Engineering

Supervisor

Irini Angelidaki

Co-supervisors

Panagiotis Tsapekos

ECTS credits

30

Type

MSc thesis, Special course

Must be completed

MSc thesis, Special course

MSc in Chemical and Biochemical Engineering

Supervisor

Irini Angelidaki

Co-supervisors

Panagiotis Tsapekos

ECTS credits

30

Type

MSc thesis, Special course

Must be completed

MSc thesis, Special course

MSc in Sustainable Energy

Supervisor

Irini Angelidaki

Co-supervisors

Panagiotis Tsapekos

ECTS credits

30

Type

MSc thesis, Special course

Must be completed

MSc thesis, Special course

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


Today, DTU is ranked as one of the foremost technical universities in Europe, continues to set new records in the number of publications, and persistently increases and develops our partnerships with industry, and assignments accomplished by DTU’s public sector consultancy.

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Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby

Denmark



Tlf. (+45) 45 25 25 25

CVR-nr. 30 06 09 46

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