How it Works
Flow enters the unit tangentially to create a low speed vortex motion with treated effluent passing on to further treatment via a top spillway outlet.

The collected sludge is removed from the base hopper in the same way as conventional primary tanks. The sludge normally thickens to 2-5% dry solids (by weight). The dry solids concentration is a function of frequency and duration of sludge removal. The Swirl-Flo Process uses single or multiple units in parallel, depending upon the flow to be treated.

If a higher quality effluent is required, the influent can be dosed with coagulants and flocculant aids. In this way the performance of the process can be tailored to meet a range of effluent standards.