PURPOSE: To enhance transportation efficiency, in the title device for buildings or the like, by arranging pumps for providing a driving force attributable to Lorentz's force in a conductor-made transportating pipe in the interior of which sea water is filled, and providing a filter at the discharge port.

CONSTITUTION: A dc current is passed by making an electrode plate 6 a positive electrode, and an electrode plate 7 a negative electrode, and a magnetic field H perpendicular to the current is applied by a superconducting magnet 9. Thereby, according to the Fleming's left-hand rule, a Lorentz's force in the arrow direction is applied to sea water (a). Since the force to be applied in this case is determined by the product of the current and the magnetic field, the force or the driving force of sea water can be increased by increasing the magnetic field. By utilizing this driving force of sea water, waste materials are transported by waste transportion pumps 5 to the discharge port 3, where waste materials (b) are separated via a filter 14, and sea water (a) is circulated. By this constitution, transportation efficiency can be enhanced.