What types of wastewater screens are used in the headworks?
The type of screen a facility uses is dependent on its process. Plants with heavy solids loading or combined stormwater systems need bar screens or auger screens with a grinder to turn large, bulky solids like tree branches into easy to handle chunks. On the other hand, a plant using Membrane Bioreactors need a finescreen with 3mm or smaller perforations so the high-tech treatment process can operate at maximum efficiency. A Sequencing Batch Reactor also requires a screen with small perforations, typically an auger fine screen, in part to ensure condoms and rags are removed so they do not escape into the environment. Condoms and some rags pass right through bar screens even if they have the smallest available spacing between the bars.
