The present disclosure relates to a sludge collector including: a plurality of flights collecting sludge in a settling basin; a chain connected to the plurality of flights to move the flights; and an attachment-integrated roller unit detachably coupled to an attachment connected to the flights, and preventing the flights from being reversed when the flights are operated.

The present disclosure relates to a sludge collector including: a plurality of flights collecting sludge in a settling basin; a chain connected to the plurality of flights to move the flights; and an attachment-integrated roller unit detachably coupled to an attachment connected to the flights, and preventing the flights from being reversed when the flights are operated.

A nozzle is provided for a header conduit. The nozzle includes an inlet that is resistant to clogs caused by flat materials covering the inlet. The inlet generally includes multiple pathways to an elongated passageway through which waste liquid and sludge (“waste”) are guided and enter the header conduit. In one embodiment, the elongated passageway is oriented to guide the waste along a path that is tangential to at least the inner surface of the header conduit which such incoming waste first contacts. When the conduit has an inner surface of circular cross-section, the passageway may optionally be elongated enough that the incoming waste enters the header conduit along a path tangential to the circular surface. To better assure axial flow of the waste in the conduit to an outlet, in one embodiment the passageway provides both the tangential flow and is at an acute angle to the longitudinal axis of the conduit. The incoming waste is thereby provided with an axial component. In this manner, the passageway assures that the energy and momentum of the incoming waste is helical in direction. The waste previously admitted into the header conduit is urged by the newly entering waste to continue to flow helically in the conduit. The passageways are provided at spaced intervals along the length of the conduit to collect sludge from a wide area of the bottom of the basin. Because of the tangential orientation of each of the passageways and the resulting initial tangential flow of the incoming waste, the waste incoming from each of those multiple passageways reinforces the existing helical flow of waste in the conduit.

A nozzle is provided for a header conduit. The nozzle includes an inlet that is resistant to clogs caused by flat materials covering the inlet. The inlet generally includes multiple pathways to an elongated passageway through which waste liquid and sludge (“waste”) are guided and enter the header conduit. In one embodiment, the elongated passageway is oriented to guide the waste along a path that is tangential to at least the inner surface of the header conduit which such incoming waste first contacts. When the conduit has an inner surface of circular cross-section, the passageway may optionally be elongated enough that the incoming waste enters the header conduit along a path tangential to the circular surface. To better assure axial flow of the waste in the conduit to an outlet, in one embodiment the passageway provides both the tangential flow and is at an acute angle to the longitudinal axis of the conduit. The incoming waste is thereby provided with an axial component. In this manner, the passageway assures that the energy and momentum of the incoming waste is helical in direction. The waste previously admitted into the header conduit is urged by the newly entering waste to continue to flow helically in the conduit. The passageways are provided at spaced intervals along the length of the conduit to collect sludge from a wide area of the bottom of the basin. Because of the tangential orientation of each of the passageways and the resulting initial tangential flow of the incoming waste, the waste incoming from each of those multiple passageways reinforces the existing helical flow of waste in the conduit.

A head shaft assembly has a center tube, an end tube, a collector sprocket and a collar. The center tube has drive and driven ends. The center tube has a center tube diameter. The end tube has a key extending longitudinally along an outer surface and inner and outer ends. The key defines a key length and the end tube has an end tube diameter. The collector sprocket is mountable to the end tube and rotationally secured to the end tube by the key. The collar is hollow between a first end and a second end. The center tube diameter is substantially the same as the end tube diameter and the drive end is proximate to the inner end. The drive end and the inner end are positioned within the collar between the first end and the second end. The collar fixes the center tube to the end tube.

A head shaft assembly has a center tube, an end tube, a collector sprocket and a collar. The center tube has drive and driven ends. The center tube has a center tube diameter. The end tube has a key extending longitudinally along an outer surface and inner and outer ends. The key defines a key length and the end tube has an end tube diameter. The collector sprocket is mountable to the end tube and rotationally secured to the end tube by the key. The collar is hollow between a first end and a second end. The center tube diameter is substantially the same as the end tube diameter and the drive end is proximate to the inner end. The drive end and the inner end are positioned within the collar between the first end and the second end. The collar fixes the center tube to the end tube.

A traveling direction of a sludge drawing tool can be reversed regardless of the position of the sludge drawing tool. An endless chain is wound around a pair of wheels, and has straight lines L1 and L2 extending therebetween, and a pulling portion is provided in a part thereof. A sludge drawing tool is arranged to be able to move forward between the wheels. The sludge drawing tool is provided with engagement portions having a shape enabling the pulling portion circumferentially moving along the chain to be engaged therewith and disengaged therefrom. When the driving wheel rotates in a forward direction, the engagement portion comes into contact with the pulling portion circumferentially moving along the straight line L1 in a drawing direction, to make the sludge drawing tool move in the drawing direction. During the rotation in the forward direction, the engagement portion comes into contact with the pulling portion.

A traveling direction of a sludge drawing tool can be reversed regardless of the position of the sludge drawing tool. An endless chain is wound around a pair of wheels, and has straight lines L1 and L2 extending therebetween, and a pulling portion is provided in a part thereof. A sludge drawing tool is arranged to be able to move forward between the wheels. The sludge drawing tool is provided with engagement portions having a shape enabling the pulling portion circumferentially moving along the chain to be engaged therewith and disengaged therefrom. When the driving wheel rotates in a forward direction, the engagement portion comes into contact with the pulling portion circumferentially moving along the straight line L1 in a drawing direction, to make the sludge drawing tool move in the drawing direction. During the rotation in the forward direction, the engagement portion comes into contact with the pulling portion.

A settling basin of a wastewater treatment system includes a collector chain including chain links having a plurality of side bars, stepped connecting pins configured to join the plurality of side bars and including a first end including a head portion having a cross-sectional area larger than portions of the plurality of side bars through which the stepped connecting pin extends, end caps configured to receive second ends of the stepped connecting pins, and apertures defined in the end caps and second ends of the stepped connecting pins configured to receive a retaining element that holds the end caps in position on the second ends of the stepped connecting pins.

A settling basin of a wastewater treatment system includes a collector chain including chain links having a plurality of side bars, stepped connecting pins configured to join the plurality of side bars and including a first end including a head portion having a cross-sectional area larger than portions of the plurality of side bars through which the stepped connecting pin extends, end caps configured to receive second ends of the stepped connecting pins, and apertures defined in the end caps and second ends of the stepped connecting pins configured to receive a retaining element that holds the end caps in position on the second ends of the stepped connecting pins.