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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.

Pub. No.:    2129351    International Application No.:    9700279
Publication Date: Wed Jun 02 01:59:59 CEST 1999 International Filing Date: Sat Feb 08 00:59:59 CET 1997
IPC: B01D 53/84
B01D 53/52
B01D 53/52
B01D 53/84
Applicants: UNIV CADIZ
Inventors: MACIAS GARCIA MANUEL
CANTERO MORENO DOMINGO
MESA DIAZ M MAR
ANDRADES BALAU JOSE ANTONIO
Title: Automated system for the elimination of sulphydric acid from biogas produced in sewage works, with biological recovery of the reagent.
Abstract:
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.