Typical Wastewater TreatmentBar RackGrit ChamberDisinfectionSecondary ClarifierAeration TankPrimary ClarifierInfluentGritSludgeReturn activated sludge (RAS)SludgeEffluentScreenings

Most Common ConfigurationsPFR activated sludge processComplete mix activated sludge process

Components of Activated Sludge

Reactor where microorganisms are kept in suspensionLiquid solids separationRecycle system for returning solids back to the reactor

Design and Operating Parameters of Activated Sludge

F/M food to microorganism ratio

SRT solids retention time

Volumetric loading rate (kg BOD/m3-d)

****