The population growth rate and demand for various chemicals lead to develop different industries that inherently incorporate with pollutant generation. A significant part of the pollutants are in the form of industrial wastewater which must be treated. Ammonia is one of the most common pollutants. Since the presence of ammonia in wastewater is a serious threat, it is important to remove it from wastewater. In this work, the removal of ammonia has been investigated using the adsorption via different biomass. The analytic hierarchy process (AHP) has been applied to choosing optimal biomass. Three factors of cost, abundance, and efficiency were selected as the criteria, as well as the fruit pericarp biochar (FPB), nut husk biochar (NHBC), starchy staples biochar (SSBC), and meat and bone biochar (MBBC) as alternatives. Pairwise comparison of parameters indicated that NHBC with 32%, and efficiency with 37% were chosen as the preferred alternative and criteria, respectively.
