Patent ID: 6182833
Filing Date: 2001-02-06
Classification: B01D,B07B

Abstract:
apparatus for screening wastewater comprising:a frame;a rotatable cylindrical screen carried by the frame and having an axis of rotation and which is defined a tubular perforate wedgewire sidewall having an interior wedgewire surface and an exterior wedgewire surface;a wastewater conduit having an opening disposed inside the wedgewire sidewall through which conduit effluent is discharged;an elongated pneumatic rodless cylinder positioned along the length of said cylindrical screen,a carriage slidably mounted along said pneumatic rodless cylinder, said carriage having a power nozzle sprayer that reciprocates with said carriage and from which fluid is ejected against the wedgewire sidewall to dislodge solids from the wedgewire sidewall, said power nozzle sprayer being coupled to a first end of a flexible conduit that communicates said fluid to the power nozzle sprayer;a first end cap connected to a first end of the pneumatic rodless cylinder, the first end cap including a first threshold sensor, the first threshold sensor detecting when the carriage has reached desired limit of travel and providing pneumatic feedback information regarding the position of the carriage;a second end cap connected to a second end of the pneumatic rodless cylinder, the second end cap including a second threshold sensor, the second threshold sensor detecting when the carriage has reached a desired limit of travel and providing pneumatic feedback information regarding the position of the carriage;a four-way main air valve that provides air flow to the rodless cylinder which controls a direction travel of the carriage along the rodless cylinder, the four-way main air valve changing position in response to the pneumatic feedback information and the carriage changing a direction of travel in response to the change in position of the four-way main air valve; anda pump in fluid flow communication with a supply of said fluid for delivering the fluid to the power nozzle sprayer.