Biogas desulfurization is the process of removing toxic and harmful gases such as hydrogen sulfide (H2S) from biogas. The commonly used biogas desulfurization equipment mainly includes the following types:
1. Wet desulfurization equipment: including oxidation absorption method, alkali absorption method, and biological desulfurization method. The oxidation absorption method is applicable to the desulfurization of high concentration H2S gas. The oxidant, such as Sodium chlorate or Calcium chlorate, is used to oxidize H2S into sulfate solution, and then the alkaline solution absorption method is used to wash clean biogas. The alkali absorption method uses a strong alkali (such as sodium hydroxide) solution to absorb H2S, generate sulfide precipitates, and then oxidize them with oxidants to form elemental sulfur for recovery. The biological desulfurization principle removes H2S through the metabolic capacity of microorganisms, including sulfate reducing bacteria, nitrite reducing bacteria, etc.
2. Dry desulfurization equipment: mainly including activated carbon adsorption method and dry desulfurization method. The activated carbon adsorption method utilizes activated carbon to adsorb H2S and convert it into sulfides. The commonly used dry desulfurization method is an oxidant, such as oxygen or iron peroxide, which oxidizes H2S to produce sulfur under the action of a catalyst, and then reacts with the catalyst to obtain clean biogas.
The above are common biogas desulfurization equipment, which are suitable for different desulfurization scales and treatment requirements. Please choose the appropriate equipment according to the specific situation. In addition, depending on the sulfur content of biogas, it may be necessary to combine multiple desulfurization equipment for treatment.
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