Removal of Water

Biogas is saturated with water vapour after leaving the digester. Water can condensate in gas pipelines and lead to corrosion together with sulfur compounds. It can also affect other purification systems, as in the case of the adsorption columns packed with activated carbon, in which water can destabilize the structure of the material. A simple condensation process can be used to eliminate water, usually carried out by increasing the pressure or decreasing the temperature.

Adsorption based removal techniques include the use of silica, activated charcoal or molecular sieves. Regeneration of the materials is easily achieved by heating or decreasing the pressure. A simple absorption technology is the use of hygroscopic salts, (Petersson and wellinger 2009).

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