METHOD AND APPARATUS FOR HELICAL FLOW IN A HEADER CONDUIT

摘要

A header conduit (41-2) provides an elongated passageway through which waste liquid and sludge ("waste") pass along a path (59P) that is tangential to at least the inner surface of the conduit. When the conduit (41-2) has an inner surface of circular cross section, the incoming waste enters the conduit (41-2) along a path tangential (59P) to the circular surface. To better assure axial flow of the waste in the conduit to an outlet (49), the passageway provides both the tangential flow (59P) and is at an acute angle (61) to the longitudinal axis (43) of the conduit (41-2). The waste previously admitted into the header conduit (41-2) is urged by the newly entering waste to continue to flow helically (59). The passageways (51-2, 51-2N) are provided at spaced intervals along the conduit (41-2) to collect sludge from the bottom of clarifier-sedimentation basin (not shown). The tengantial orientation of each of the passageways (51-2, 51-2N) reinforces the existing helical flow (59P) of waste in the conduit.