Fcc Aqualia, S.a.

Ignacio De Godos Crespo

Bernardo Llamas Moya

José Ramón Santiago Costa

Raúl Cano Herranz

Enrique Lara Corona

José Luis Mendoza Martin

Francisco Gabriel Acién Fernández

A sustainable method and a system for cleaning impurities, mainly hydrogen sulphide, and upgrading of biogas having hydrogen sulphide concentration up to 2% (20,000 ppmv), preferably produced in wastewater treatment plants (WWTPs) to biomethane. The system includes a counter-current, non-pressurized physical absorption bubble column having a high influent liquid-to-gas flow ratio L/G higher than 1 and preferably equal or higher than 3 and equal or lower than 10, for achieving a simultaneous removal of hydrogen sulphide and carbon dioxide. The system may be inserted for instance on an existing wastewater treatment plant, in such a way that the wash water is the primary treated wastewater of the plant, and preferably the biogas to be upgraded is produced in the anaerobic digesters of the plant itself, and also includes means for regenerating the used wash water by the biological reactor of the plant itself used for the secondary treatment.

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Madrid, Spain

Ignacio De Godos Crespo