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Activated carbon (CA) is a carbon-based material with a well-developed internal porous structure and large surface area. It is a very popular adsorbent used for water and wastewater treatment. Brazil is the third largest beer producer in the world, due to the large amount of waste generated by this industrial branch several alternatives are propose for the use of waste, one of them is the production of CA with the bagasse of malt. To evaluate malt bagasse as a precursor for CA it was compared to other agro-industrial residues that are used as precursors for CA, such as the residue from coffee production and orange peel, the type of physical and chemical activation for obtaining CA and the adsorption capacity were also compared, phenomenon physical chemical in which the component of a gaseous or liquid phase is transferred to a solid surface, the components that join a solid phase are called adsorbates and the component that retains the liquid phase is called adsorbent (CA). Malt bagasse as a precursor to CA has proven to be a promising alternative because of the results achieved compared to other agroindustrial wastes and because it is a cheap and resource-intensive alternative. [ABSTRACT FROM AUTHOR]