Or

Acidic/ basic tank r

Wastewater in

Settled grit for landfill

Secondary treatment

Primary settler

Return activated sludge (RAS)

NOx recycle

Deoxic

>

' 1>

Anaerobic

>

Anoxic

Aerobic

reactor

reactor

reactor

Effluent to tertiary treatment

Effluent tank

Secondary settler

RAS tank

Sludge recycle

Figure 2 Schematic diagram of an activated sludge wastewater treatment plant.

Figure 3 Wastewater treatment plant of Buelach, Switzerland. Reproduced by permission of Ecoling Partner Ltd., Switzerland.

• Phosphorus uptake from solution to PP utilizing the PHA and DO (SO).

• Growth of the PAO biomass, also utilizing the PHA and DO.

ASM1 and ASM2 developed by IAWQare widely used models for describing chemical reactions for organic car bon and nitrogen removals, and phosphorus removal, respectively.

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