Tow-Bro® Unitube circular clarifiers offer rapid sludge removal with maximum solids concentration and minimum sludge agitation.

The computer-designed Unitube header ensures positive, rapid removal of settled, concentrated sludge in one revolution. Rapid removal means a fresher sludge with less chance of septicity, reduced aeration requirements and prevention of phosphate release.

Maximum solids concentrations are achieved because the undisturbed layer on the tank floor is removed first, which means the necessary pounds of solids required to maintain the process are returned without unnecessary dilution water, and less pumping is required. Aeration basins and solids handling systems can be designed and operated for the minimums since sludge is not diluted and liquid volumes are reduced.

The header design and gentle removal action reduces sludge agitation, preventing concentrated settled sludge from being resuspended into the upper liquid. This also helps to avoid sludge dilution.

The Tow-Bro® system has a balanced hydraulic design that operates over a wide range of flows and permits low sludge blankets to be maintained for clearer effluents. The system reduces the torque requirements in comparison to other sludge removal devices as there is no scraping or plowing of the sludge, which makes it an economical solution. The high-quality of the produced sludge also reduces aeration requirements, which further reduces energy costs.