Agricultural biogas plants are largely operated with liquid manure. Due to the protein-containing substrate, hydrogen sulphide is also produced in the desired product biogas in addition to methane and carbon dioxide. To prevent corrosion in the gas engine and unacceptably short engine oil life due to the conversion of the hydrogen sulfide into sulfuric acid during the combustion of the biogas in the gas engine, the hydrogen sulfide must be removed from the gas. Previous solutions have had a lasting negative impact on economic efficiency due to high operating costs resulting from the use of chemicals, or they are expensive due to complex plant technology in the form of gas scrubbers or packed columns, so that acquisition is not economically justifiable for smaller plants. A new approach aims to optimize gas purification outside the fermenter so that complex plant technology and expensive equipment can be dispensed with, making Desulfurization economically viable for smaller plants. This is achieved by means of a two-stage process through the use of innovative operational management and components.
Development and Optimization of an Innovative Process Technology for Hydrogen Sulfide Removal from Biogas
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