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1. (ES2129351) Automated system for the elimination of sulphydric acid from biogas produced in sewage works, with biological recovery of the reagent.

Application Number: 9700279 Application Date: 07.02.1997
Publication Number: 2129351 Publication Date: 01.06.1999
Publication Kind : B1
IPC:
5B 01D
5B 01D
B01D 53/52
B01D 53/84
Applicants: UNIV CADIZ
Inventors: MACIAS GARCIA MANUEL
CANTERO MORENO DOMINGO
MESA DIAZ M MAR
ANDRADES BALAU JOSE ANTONIO
Priority Data: 9700279 07.02.1997 ES
Title: (EN) Automated system for the elimination of sulphydric acid from biogas produced in sewage works, with biological recovery of the reagent.
(ES) SISTEMA AUTOMATIZADO PARA LA ELIMINACION DEL SULFHIDRIDO DEL BIOGAS PRODUCIDO EN PLANTAS DE AGUAS RESIDUALES, CON RECUPERACION BIOLOGICA DELREACTIVO.
Abstract:
(EN) Automated system for the elimination of sulphydric acid from biogas produced in sewage works, with biological recovery of the reagent. The present invention consists of a totally automated system for the elimination of sulphydric acid from biogas produced in sewage works, with biological recovery of the reagent. The process consists of bringing a ferric sulphate solution into contact with the stream of biogas from the digesters, and the solution absorbs the sulphydric acid from the biogas, oxidizing it to elemental sulphur. The resultant solution is passed through a bioreactor, where the microorganism oxidizes the ferrous sulphate to ferric, completing the cycle. The microorganism is immobilized on an activated carbon support. The fermenter operates semicontinuously, with the charging and discharging intervals depending on the flow rate and on the concentration of sulphydric acid in the biogas from the digesters. This process is controlled by a multi-variable control system, which in addition allows the levels of the variables in the system to be kept at constant and predetermined values.
(ES) La presente invención consiste en un sistema, totalmente automatizado, para la eliminación de sulfhídrico del biogás producido en plantas de aguas residuales, con recuperación biológica del reactivo. El proceso consiste en poner en contacto una disolución de sulfato férrico con la corriente del biogás procedente de los digestores, la disolución absorbe el ácido sulfhídrico del biogás oxidándolo a azufre elemental. La disolución resultante se hace pasar a través de un biorreactor, donde el microorganismo oxida el sulfato ferroso a férrico, cerrando el ciclo. El microorganismo se encuentra inmovilizado sobre un soporte de carbón activo. El fermentador trabaja en semicontinuo, dependiendo los intervalos de carga y descarga del caudal y de la concentración de sulfhídrico en el biogás procedente de los digestores. Este proceso está regulado por un sistema de control multivariable, que permite, además, mantener los niveles de las variables del sistema en valores constantes y prefijados.