There are a variety of sludge ...
Published by John Salonich, Vice President / Managing Director
There are a variety of sludge blanket clarifiers. Each has their own nuance for using the sludge to aid in treatment, I would source information from the various vendors, as there are Pulsator, Actiflo, et. al. Great place to start is with vendor technical literature available online and then develop matrix of the differences and similarities then determine which would most closely fit your process requirements based on the wastewater characteristics for your project.