FILTER DEVICE COMPRISING SEMI-PERMEABLE MEMBRANES

摘要

Filtration device for semi permeable membranes, being of the type constructed with an elongated tank that has a filtration membrane on the inside arranged longitudinally, in a tubular form or twisted into a spiral, in the body of the fluid flow between the feed inlet duct and the outlet of the waste extraction duct, characterised in that it includes two oscillating elements linked respectively between the feed inlet and the waste extraction outlet duct. On the inside, each oscillating element has a compression pre-chamber with a movable diaphragm arranged parallel to the liquid flow, both elements being operationally suitable to subject the liquid contained in the tank to repeated oscillating movements by the successive and alternating injection and extraction of a liquid mass movement. The object of said liquid movement is obtain a high tangential velocity of flow on the surface of the membrane and significant drag forces over the layer of concentrated waste and the crust build up of minerals. The drag forces subject the concentrated waste layer on the membrane to a steady movement towards the concentrated waste extraction duct. Both diaphragms are moved in an oscillating manner and phased by means of a double action cylinder linking the respective pressure pipes to the pre-chambers of the oscillating elements. <IMAGE>