Dissolved Air Floatation (DAF) provides a solution for removing particles down to 25 µm (or towards 10 µm with chemical dosing) compared to a Saveall which removes particles in the 100µm+ range. However, DAF sludge tends to be generated at around 2 to 8% solids (depending upon the inlet and operations of the DAF, hence there is motivation to consider firstly removing fat to create a tallow product before processing through a DAF and to also consider concentrating the DAF sludge to reduce waste management costs.
Hydrocyclone technology (where liquid is pumped into a cone arrangement that applies high centrifugal forces) can separate fat particles towards 15 µm hence providing an opportunity to create a tallow product from a RMP red stream and could also concentrate DAF to a higher solids concentration. Removal of fats from the red stream showed strong technical viability with an estimated 1.2-year payback.