aerdisc® is 100% rag-free!
Ragging is a bane in the life of every wastewater treatment plant operator.
When developing aerdisc®, we prepared a design brief and No.1 on the list was “Resistance to ragging”.
It was a lofty goal considering ANYTHING immersed in wastewater, or intercepting the flow of wastewater, is susceptible to ragging; more-so if moving and, worse-still if rotating.
aerdisc® is immersed 300mm, rotating at 69rpm and often installed in unscreened plants so should be highly vulnerable to ragging.
However, the unique disc design has no capacity to capture rag and in-fact repels rag and other debris due to the formation of a boundary layer at the periphery of each disc.
At Central Otago District Council’s Cromwell plant, five aerdisc® aerators have been operating continuously for almost 3-years in ponds, heavily laden with rag and settled deposits and yet there is not a fibre of rag on the discs.
We originally aimed for resistance to ragging but can now state, ELIMINATION of ragging.
