This question makes me think. Outside the religious view, yet being truthful to self.. elimination from consciousness..
'Yes' and 'No'.
Outside religious views; suggests that evil does not exist. So, the question would not have been valid. To question evil and believe that there is evil, there must be a God. When there is a belief of God; it is the foundation of religion;-) Thus, the question of whether human can eliminate evil from their consciousness does not merit since without religion views, there is no God or evil, and without evil there is no manifestations:-)
Now, being truthful to self:-
Yes, evil can be eliminated from consciousness by resisting and replacing the ideas he plant with thoughts of which is good, pure, lovely etc.. Without sin, evil has no foothold. When you do not exalt his existence, he cannot be active in you.
No, human by their own strength cannot eliminate evil. Without God, human can do nothing.