A grit removal unit including an influent channel directing wastewater with grit into a round grit removal chamber and an effluent channel receives wastewater output from the chamber. A divider wall extends upwardly between the sides of the influent channel, and gates at the upstream end of the divider wall are adjustable to selectively open channel portions on opposite sides of the divider wall. An output guide member is mounted to allow selective adjustment of output flow opening width c to the effluent channel. The output guide member has a horizontal bottom extending from the chamber into the effluent channel across the width of the output opening, and a guide wall extending upwardly from the guide member bottom. The guide wall has a forward end spaced from the chamber annular vertical wall to define the output flow opening width therebetween.

A dust separator including a top member having a top member having an inlet port arranged to supply dust-laden air and an outlet port arranged to remove clean air, the top member having a lower portion configured as a lip and having a radius which equals diameter of the inlet port, and a dust separator plate, housed within the lip, having a passage with at least one opening arranged to remove the dust from within the top member.

A dust separator including a top member having a top member having an inlet port arranged to supply dust-laden air and an outlet port arranged to remove clean air, the top member having a lower portion configured as a lip and having a radius which equals diameter of the inlet port, and a dust separator plate, housed within the lip, having a passage with at least one opening arranged to remove the dust from within the top member.

According to one aspect of the present invention, a filtration device includes a tank portion including a first tank to which a liquid containing foreign matters flows, and a pump provided at a central portion of the first tank to discharge the liquid stored in the first tank. The first tank includes a bottom surface, four side surfaces connected to the bottom surface, four corners to which the bottom surface and two of the four side surfaces are connected, and four inclined surfaces covering the four corners. The four inclined surfaces are inclined to be close to the bottom surface from a connecting portion to which the two side surfaces are connected toward the central portion.

According to one aspect of the present invention, a filtration device includes a tank portion including a first tank to which a liquid containing foreign matters flows, and a pump provided at a central portion of the first tank to discharge the liquid stored in the first tank. The first tank includes a bottom surface, four side surfaces connected to the bottom surface, four corners to which the bottom surface and two of the four side surfaces are connected, and four inclined surfaces covering the four corners. The four inclined surfaces are inclined to be close to the bottom surface from a connecting portion to which the two side surfaces are connected toward the central portion.

A cyclonic particle separator includes a first member having an arcuate outer wall and an inlet port having a diameter d1 extending from the outer wall in a first direction and an outlet port extending from the wall in a second direction, the first direction being different than the second direction; a separator plate in communication with the first member; and a cyclonic chamber defined by the separator plate and the outer wall, the cyclonic chamber, the separator plate, and the outlet port having a common central axis.

A cyclonic particle separator includes a first member having an arcuate outer wall and an inlet port having a diameter d1 extending from the outer wall in a first direction and an outlet port extending from the wall in a second direction, the first direction being different than the second direction; a separator plate in communication with the first member; and a cyclonic chamber defined by the separator plate and the outer wall, the cyclonic chamber, the separator plate, and the outlet port having a common central axis.