Biogas Steam Reforming in Wastewater Treatment Plants: Opportunities and Challenges

Hydrogen as an energy vector is going to play an important role in the global energy mix. On the other hand, wastewater management has become a worldwide concern, as urban settlements have been considerably increasing for decades. Consequently, biodigestion to produce biogas (rich in methane) in wat...

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Bibliographic Details
Published in:Energies (Basel) 2023-09, Vol.16 (17), p.6343
Main Authors: González, Juan Félix, Álvez-Medina, Carmen María, Nogales-Delgado, Sergio
Format: Article
Language:English
Subjects:
anaerobic biodigestion
Biogas
Biomass energy
Carbon dioxide
catalysis
coke deposition
Developing countries
Environmental impact
Fatty acids
Hydrogen
Hydrogen sulfide
hydrothermal carbonization
LDCs
Methane
Microorganisms
Natural gas
Pollutants
Purification
Sanitation
Sedimentation & deposition
Sewage
sewage sludge
Sludge
Synthesis gas
Water treatment
Water treatment plants
Water utilities
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Summary:Hydrogen as an energy vector is going to play an important role in the global energy mix. On the other hand, wastewater management has become a worldwide concern, as urban settlements have been considerably increasing for decades. Consequently, biodigestion to produce biogas (rich in methane) in water treatment plants could be an interesting starting point to obtain a valuable gas that can be converted into hydrogen through steam reforming. The aim of this work was to review the main aspects concerning steam reforming of biogas from wastewater treatment plants. For this purpose, the whole chain, from water treatment to hydrogen production and purification, was considered, paying attention to the main challenges and new technologies for its optimization. Thus, a wide range of possibilities is offered, from direct energy use of syngas to high purification of hydrogen (mainly through pressure swing adsorption or membrane reactors), presenting advantages and disadvantages. In any case, the role of catalysts seems to be essential, and aspects such as hydrogen sulfide and coke deposition control should be addressed. In conclusion, biogas steam reforming applied to wastewater treatment plants is a reality, with serious possibilities for its global implementation at the industrial level, according to techno-economic assessment.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16176343