Roger Road Wastewater Reclamation Facility
Illustrations of Treatment Processes
Click on thumbnails to see larger versions.
Headworks
The Headworks is the initial receiving area for raw
sewage from the conveyance system. Screens filter out large materials
and grit chambers allow heavy sand and rocks to settle before sewage
is sent to the primary clarifiers. Note - the Headworks at the Roger
Road WRF is now covered (part of the Odor
Control Project).
Clarifiers
Clarifiers separate sludge and scum from the sewage
before biotreatment.
Biotowers
The two biotowers at the Roger Road WRF remove
suspended particles and pollutants by biological treatment. Sewage
is distributed across a "zoogleal mass" filled with
bacteria that eat waste products. After biological treatment,
secondary clarifiers provide further treatment.
Secondary Clarifiers and Biotower Recirculation System
Filtered effluent from the biotowers flows to
the secondary clarifiers, while excess sludge is pumped to the thickeners,
then to the digesters. "Returned sludge" containing microorganisms
is returned to the biotowers if needed to maintain moisture levels,
or recycled through the secondary clarifiers again. Secondary
effluent flows on to the Chlorine Facility.
Chlorination and Discharge
Chlorine Contact Chambers provide extended contact
between effluent and chlorine. The chlorinated effluent is used
for golf courses and other reuse, or dechlorinated and discharged
into the Santa Cruz River.
Illustrations by Jan McDonald,
Pima County Regional Wastewater Reclamation
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