We are developing projects focusing on the following themes: 'from oil to water, water to air, air to vacuum.' Currently, we are producing a screw dry vacuum pump which is able to treat sealed liquid waste through a process of inverse diffusion in order to solve environmental problems. This vacuum pump works to preserve the environment in a number of ways. It is used in the manufacturing process of the thin film solar cell for clean energy; it is used in PCB (Polychlorinated biphenyl) waste treatment facilities; and, it is used as a withdrawal device for VOC (Volatile organic compound) gas.