The adsorption of metal ions by low cost was evaluated under various conditions such as pH, heavy metal
concentration, mixing speed and adsorbent dose through both kinetic and isotherm studies.The optimum removal
condition was also identified for each metal ion. Table 1 indicates the main consistent, primary source, physical structure,
chemical characterization and the primary use of low cost adsorbents such as rice husk and fly ash (see Figs. 1 and 2).