In the PSA BASED Oxygen Gas Generation Process, the compressed air is fed to the twin towers filled with zeolite molecular sieves which separate oxygen from rest of the constituent of air. The oxygen generated is 95% pure. When oxygen saturates from one tower, this process changes over to the other tower, thus helping in the process of continuous oxygen generation. . Such kind of the plant is generally installed in the Copper smelting, Sewage treatment Industry and paper industry etc.