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ActivatedSludge.comPractical wastewater process control

Interactive Process Map

Click or tap any part of the plant to open its page. Sludge lines are brown, the RAS loop is green, and recycle streams are dashed.

Interactive treatment plant process mapA clickable map of a treatment plant. Liquid flows from influent through preliminary treatment, primary clarifiers, aeration, secondary clarifiers and disinfection to effluent. Sludge flows as RAS, WAS and primary sludge to thickening, digestion, dewatering and biosolids. Each area links to a learn page.Liquid treatmentInfluentraw wastewaterPreliminaryscreens, gritPrimaryclarifiersAerationactivated sludgeSecondaryclarifiersDisinfectionUV or chlorineEffluentto riverRASWASPrimary sludgeSolids treatmentThickeningGBT, gravityDigestionanaerobicDewateringcentrifugeBiosolidsClass BCentrate and filtrate return to the headworks (ammonia and solids load)Microscopecheck the biology

Text list of map links

Influent

Preliminary treatment

Primary clarifiers

Aeration (activated sludge)

Secondary clarifiers

Disinfection

Effluent

RAS

WAS

Thickening

Digestion

Dewatering

Biosolids

Microscope

The White River WRRF (a fictional plant used in examples on this site) follows this same layout: four primary clarifiers, four MLE aeration trains, four 90 ft secondary clarifiers, UV disinfection, gravity belt thickeners, anaerobic digesters and a centrifuge.