Differing kinds of desiccant dehumidifiers do the job in various ways, but the main method they use to extract moisture in the air is possibly absorption or adsorption. Absorption happens in the event the desiccant material dissolves as it requires moisture within the air, as is the case with dampness https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/