Process and biofilter system for removing H2S from a gas stream contaminated with energy production H2S containing methane and using said biofilter system

摘要

Removal process H2S from a gas stream of energy production contaminated with H2S containing methane, using a system of aqueous biofilter (10) comprising a biofilter (6) having a support material for biofilters it constitutes a bed of biofilter It is supporting a humidified biofilm having microorganisms are able to oxidize H2S, wherein the process comprises the steps of - contacting the gas stream energy production contaminated with H2S with microorganisms of the humidified biofilm, and - oxidation by microorganisms of at least part of the H2S in the gas stream of energy production contaminated with H2S, which results in a gas stream production depleted energy in H2S, wherein the process further comprises the step of humidifying the biofilm by means of the gas stream of energy production which has been pre-humidified before contacting the biofilm, the addition of an aqueous nitrate solution to the gas stream of energy production contaminated with H2S through a spray nozzle adapted to atomize the nutrient and / or nitrate solution in the gas stream energy production, before contacting the microorganisms, enabling the microorganisms oxidize H2S in anoxic conditions, so that a portion of the gas stream production depleted energy in H2S is recirculated, wherein the solution nutritious and / nitrate or inject the biofilter with the recirculated part of the gas stream exhausted energy production in H2S using nozzle atomization.