Anaerobic ic reaction usually produces biogas containing a certain amount of hydrogen sulfide. The content of hydrogen sulfide in biogas from different industrial wastewater is also different. If the hydrogen sulfide content is too high, in order to avoid corrosion of pipes and boilers, hydrogen sulfide must be removed from the biogas before entering the boiler. Are these characteristics of biogas desulfurization clear enough?
The invention relates to a method for removing highly corrosive and highly toxic hydrogen sulfide gas from biogas by using biological strains. The process has the advantages of high automation, simple process and low operation cost. The biogas produced by anaerobic fermentation enters the scrubber and reacts with the alkaline circulating atomizer to remove hydrogen sulfide from the biogas. The hydrogen sulfide absorbed from rich liquid returns to the bioreactor, and the hydrogen sulfide is converted into solid elemental sulfur through biological transformation. The solution can be regenerated into alkaline absorbent for biogas cleaning, and then the absorbent is reabsorbed and absorbed. The cycle is complete. The separation of sulfur solids is carried out through the sulfur dust collector.
Biogas desulfurization combines the physical and chemical absorption of hydrogen sulfide under weak alkaline conditions and the biological regeneration of alkaline solution in the air. The biogas without hydrogen sulfide is discharged from the top of the scrubber. The solution containing hydrogen sulfide enters the bioreactor and is oxidized to elemental sulfur and alkali under limited oxygen supply. Some wastewater and by-product sulfur do not contain sulfide and can be discharged directly.
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