Chemical-biological process for the removal of H.sub.2S from a gas
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United States of America Patent
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Oct 21, 2008
Grant Date -
Nov 9, 2006
app pub date -
Dec 4, 2003
filing date -
Dec 20, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present application relates to a process for removing hydrogen sulfide H.sub.2S from a gas (1) by contacting said gas with a liquid solution (2) containing ferric sulfate in an absorption column (RC). Ferric sulfate and H.sub.2S react at room temperature and at a pressure ranging from 1 to 1.2 atm. Ferric ions being reduced to two-valent iron and sulfide oxidised to elemental sulfur. The liquid (4) coming out of the absorption column is filtered in two steps, the retentate (6, 8) comprising elemental sulfur, the filtrate (5, 7) containing the iron ions. The filtrate is sent to a bioreactor (RB) for regeneration, i.e. oxidation of iron to Fe.sup.3+ by means of thiobacillus ferroxidans and air injection (10). The regenerated solution is reused in the absorption column (RC). The process faces the problems relating to the alignment between the chemical step and the biological step in order to obtain a process which can stably run continuously.
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