Incoming wastewater flow is fed and controlled to the treatment plant.

Inlet pumping

Grit is separated from the wastewater by gravity.

Grit removal pumping

A retention basin works as a buffer volume at peak flows to help control a steady flow to the treatment plant.

Retention basin pumping

Sedimentation for removal larger solids and BOD.

Primary sludge pumping

Sequential Batch Reactor for biological treatment.

SBR waste activated sludge withdrawal

Complete mix process for biological treatment.

Conventional aeration sludge treatment mixed liquor recirculation

Oxidation ditch for biological treatment.

Oxidation ditch mixed liquor recirculation

Sedimentation of activated sludge.

Return activated sludge pumping from sedimentation

Waste activated sludge withdrawal from sedimentation

Flotation of activated sludge.

Sludge withdrawal from flotation

The treated wastewater is discharged to the recipient.

Effluent pumping

Gravity thickening of sludge in order to reduce sludge volume.

Gravity thickening supernatant recirculation pumping

Thickened sludge pumping from gravity thickening

Feeding to gravity thickener

Mechanical thickening of sludge in order to reduce sludge volume.

Feeding sludge to mechanical thickener

Thickened sludge pumping from mechanical thickening

Thickening by means of flotation to reduce sludge volume.

Feeding to flotation thickener

Flotation thickening supernatant recirculation

Thickened sludge pumping from flotation thickening

Anaerobic or aerobic digestion of sludge in order to reduce sludge volume and achieve biological stability for disposal.

Digester feeding

Digester recirculation

Digested sludge withdrawal

Storage of sludge to enable steady feeding to thickening and dewatering.

Sludge storage feeding

Withdrawal of stored sludge

Importing of sludge from external sources.

External sludge pumping

Dewatering of sludge in order to significantly reduce sludge volume.

Feeding sludge to dewatering unit

Recirculation pumping of dewatering supernatant

Dewatered sludge pumping