The results in Table 3 showed the adsorption experiment of heavy metals removal by corn cobs that carried out by laboratorial column (Figure 1). The results indicated ability of corn cobs to remove and reduce the level of heavy metals from the industrial waste water. Significant differences on removal efficiency of adsorbents for heavy metals removal is displayed in Table 4 as determined by one – way (Anova) test with the F and p value at probability level P ≤ 0.01 and P ≤ 0.05.