Trac-Vac® Sludge Collector
The TRAC-VAC? Sludge Collector removes solids from sedimentation basins by means of suction generated through differential head or pumping.
The TRAC-VAC sludge collector is a pneumatically powered or cable driven sludge collection mechanism used for the hydraulic removal of settled solids in water treatment facilities. As the TRAC-VAC sludge collector travels along the basin floor, orifices located at the bottom of the suction header pipe are within five inches of the floor to ensure powerful suction and removal of sludge from the basin floor.
The low-profile Trac-Vac unit travels beneath plate settlers, making Trac-Vac sludge collectors an ideal means of improving plate settler performance by removing accumulated solids from underneath laminar settling devices. Collection can be easily tailored to suit any rate and pattern of deposition.
Turbidity of influent water is so low (normally less than 1 NTU) that settling those solids that do exist is extremely difficult. Their solution has been to stockpile sludge from the clarifiers and recycle it to the flocculator. This achieves turbidities in excess of 1000 NTU, allowing excellent floc formation and good polishing performance from the clarifiers. Periodically, a waste cycle sends excess solids back to the clarifier which then functions as a thickener, with flow from the sludge collectors discharged to the municipal wastewater system. Successful operation is dependent on the sludge removal system accommodating fluctuating solids loading and changing patterns of deposition. To achieve this, our engineers programmed Trac-Vac controls to provide several different collection modes.
In normal operation with solids recycling, collectors run short trips started by a clock in the controller, with one long trip in every 24 hour period. During wasting, collectors run continuously in alternating long and short trips. Operators can also select just long or short trips to cover any deposition pattern that may occur.
Tubular stainless steel rails guide tractor units through the basin. Interlocking sections are easily transported and assembled.
Air supply lines between the local pneumatic panel and the tractor are enclosed in a protective sheath, manufactured from the same high density polyethylene as the sludge house. Quick Release Clamps Stainless steel toggle clamps allow faster, more convenient removal and replacement of hoses than screw type clamps.
EWT Trac-Vac Extractor
The tractor mechanism requires only infrequent servicing. When it does, Ovivo’s exclusive Trac-Vac extractor lifts the unit out of the basin for easy access maintenance, without draining the basin. When servicing is complete, the tractor is quickly reinserted and indexed against the guide rail.