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OVERVIEW
THE PROVEN CHOICE FOR LARGE FLOWS
The activated sludge process reduces the organic matter in wastewater. Bacteria in an aerated tank oxidize the carbon-based pollution, and a clarifier then separates the clean water from the sludge.
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All our CAS systems produce treated water with very low organic pollutant concentrations (BOD, COD), well within our clients' discharge requirements.
TYPICAL USES
- City and municipal sewage
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- Large communities and townships
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- Industrial wastewater with organic load
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- Upgrades of existing sewage plants
HOW IT WORKS
INSIDE A CAS PLANT
Wastewater is screened, then treated by bacteria in large aeration tanks. A clarifier settles the sludge, part of which returns to the aeration tank to keep the process running.
STEP 1
Screening and grit removal
STEP 1
Raw water​
Tap, well, river or sea
Removes solids, rags and sand
STEP 2
Primary settling
Optional, for high solids loads
STEP 1
Raw water​
Tap, well, river or sea
STEP 3
Aeration tank
Bacteria oxidize the organic pollution
STEP 1
Raw water​
Tap, well, river or sea
STEP 4
Secondary clarifier
Separates sludge, with sludge return
STEP 1
Raw water​
Tap, well, river or sea
STEP 5
Treated effluent
Low BOD and COD, ready to discharge
KEY FEATURES
WHY CHOOSE OUR CAS PLANTS
PROVEN, ROBUST PROCESS
A reliable technology with decades of use.
CONTROLLED SLUDGE RETURN
Stable biology, even with changing loads.
VERY LOW BOD AND COD
Well within discharge requirements.
BUILT FOR LARGE FLOWS
Up to 10,000 m³/day per plant.
SIMPLE OPERATION
Easy for local operators to run and maintain.
LOW COST PER M³
Efficient at large scale.
SPECIFICATIONS
TECHNICAL DATA
Every CAS plant is designed for its flow and wastewater. Download the datasheet for typical sizes, or send us your data.
Capacity range
Up to 10,000 m³/day
Process
Conventional activated sludge, extended aeration
Wastewater
Municipal and industrial
Format
Large plant, concrete or steel tanks
Aeration
[Diffused air or surface aerators]
APPLICATIONS
WHERE ACTIVATED SLUDGE (CAS) IS USED