Patent ID: 6660162
Filing Date: 2003-12-09
Classification: B01D,C02F

Abstract:
A liquid treatment installation comprising:a containing vessel defining a substantially vertical flow channel of circular cross-section; a spiral separator comprising a conical helical plate which comprises a plurality of platelets, the conical helical plate defining a helical flow passage between axially facing surfaces of the plate, the spiral separator being disposed co-axially in the flow channel, the spiral separator being formed with a central axial channel, the diameter of the separator being substantially equal to that of the flow channel, the spiral separator being attached to an annular driving ring capable of rotating about the axis of the flow channel; an inlet means arranged to supply unseparated liquid to the containing vessel; and an outlet means arranged to withdraw treated liquid from the containing vessel, the inlet and outlet means being vertically spaced in relation to the containing vessel and the arrangement being such that between the inlet and the outlet means the liquid flows vertically through the helical flow passage of the spiral separator, wherein the dimensions of each platelet of the spiral separator are such that the platelets can pass through the central axial channel of the spiral separator.