Patent ID: 7799222

Claim:
Process for the production of hydrogen sulphide in a form largely soluble in an aqueous medium, the process comprising: a stage of culturing alkaliphilic sulphate-reducing or thio-sulphate reducing bacteria selected from at least one species of the Desulfohalobiaceae family or of the Desulfonatronum genus, or of which the gene coding for the ribosomal RNA 16 S exhibits a homology of at least 97% with the corresponding gene of any one of the species of the Desulfohalobiaceae family or of the Desulfonatronum genus, in the presence of an organic compound serving as an electron donor, and in the presence of a sulphurous compound serving as an electron acceptor, which leads to the formation of hydrogen sulphide, and a sequence of the following two stages: a first stage in which the culturing of the bacteria is carried out under conditions appropriate for the growth of the bacteria and for the concomitant production of hydrogen sulphide, and a second stage in which the culturing of the bacteria is carried out under conditions appropriate for the production of hydrogen sulphide in the absence of growth of the said bacteria, and optionally repeating the sequence of the stages constituting one cycle several times if necessary.