The invention relates to a lamellar decanting module comprising two
interconnected plates, at least one of said plates being corrugated in
such a way that the dips and peaks are inclined in relation to a first
edge of said plate according to a non-zero degree angle and define
inclined decanting tubes with the other plate. Said module is
characterised in that the two plates (2, 3) have the same corrugated
profile and are interconnected in connection regions defining a plane of
symmetry (P) for the tubes (4) defined by said plates. A plurality of
modules can be assembled in such a way as to form a block in which the
plates are parallel to one of the faces.