| Product Description |
Biogas generated contains around 2000 - 40000 ppm of H2S based on feedstock characteristics which needs to reduce up to desired limit based on further biogas application,
Raw biogas enters from the bottom of the tower, while a caustic solution is sprayed from the top of the Scrubber column packed with inert media. The H2S containing gas is contacted in counter current mode with a scrubbing liquid caustic solution. This captures a significant portion of H₂S from the biogas stream,
Following the scrubbing process, the cleaned biogas exits the tower from the top, while the residual caustic solution, now containing sodium hydrosulphite, is collected at the bottom of the tower. The caustic solution enriched with Sulphide from the column flows into the bioreactor tank. The tank contains immobilized Thiobacillus bacteria. Thiobacillus bacteria, specifically Sulphur Bacteria, facilitate the breakdown of elemental sulfur present in the slurry. Thiobacillus bacteria convert the Sulphide back to free caustic, regenerating the solution for reuse,
The bioreactor tank is equipped with an air system that supplies air throughout the reaction process. This air helps facilitate the chemical reactions. As part of the recovery process, the reacted caustic solution, now containing sodium hydroxide (NaOH), is recycled. It is reintroduced into the system by being sprayed back onto the scrubber tower, completing the cycle of caustic utilization and recovery. This system offers a promising approach for H₂S removal from biogas while recovering sulfur and reducing operating costs. The valuable elemental Sulphur is obtained as byproduct with purity 80 - 90 %. Sulphur will be added in solid fertilizer as an additive to the fertilizers.
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