Energy-Efficient Air Compressors for Wastewater Treatment
Low-pressure and oil-free compressed air solutions for continuous wastewater aeration, biological treatment and air supply.
- 50% Energy Saving vs. Atmospheric Compressors
- Continuous Large Flow for Aeration
- ISO & CE Certified
- Oil-Free Options Available
Compressed Air Is Critical to Wastewater Aeration
In wastewater treatment, aeration often runs continuously. The right air compressor helps maintain stable oxygen supply while controlling energy costs and ensuring reliable plant operation.
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Lower Energy Consumption
Aeration can account for a major share of wastewater treatment energy use.
Our low-pressure compressor solutions deliver the airflow you need without unnecessary compression pressure—helping reduce energy consumption and operating costs.
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Stable Airflow
Consistent airflow is essential for effective aeration.
Sollant compressors provide stable, continuous air supply to help maintain reliable oxygen delivery and biological treatment performance.
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Built for Continuous Operation
Wastewater plants cannot afford unexpected downtime.
Our compressor solutions are designed for long-hour, continuous operation with reliable performance and reduced maintenance requirements.
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Clean & Reliable Air
Air quality matters in biological treatment.
For applications requiring clean compressed air, Sollant offers oil-free centrifugal compressor solutions for high-volume aeration.
Need the Right Compressor for Your Wastewater Plant?
Tell us your required airflow, pressure and operating hours. Our engineers will recommend a suitable compressor configuration for your application.
Wastewater Treatment Air Compressor Solutions
Low-Pressure & Oil-Free Compressed Air for Reliable Aeration
Different wastewater treatment plants require different airflow, pressure and operating conditions. Sollant provides low-pressure screw and oil-free centrifugal compressor solutions designed for continuous aeration, stable oxygen supply and energy-efficient operation.
Choose the right compressor based on your required airflow, operating pressure and plant capacity.
Single Stage Low-pressure Air Compressor
Single-Stage Compression for Energy-Efficient Aeration
- Pressure: 3 / 4 / 5 bar
- Air Flow: 2.06–59.78 m³/min
- Power：22-220KW
✓ Optimized for low-pressure aeration
✓ Up to 50% energy saving*
✓ Wide airflow range for different plant capacities
✓ Reliable solution for continuous operation
Two Stage Low-Pressure Air Compressor
Two-Stage Compression for Higher Efficiency & Longer Service Life
- Pressure: 4 / 5 bar
- Air Flow: 2.55–67.95 m³/min
Power：22-250KW
✓ Two-stage compression for improved efficiency
✓ Lower compression load on each stage
✓ Designed for long-hour continuous operation
✓ Suitable for higher airflow requirements
High-Volume, 100% Oil-Free Air for Large-Scale Aeration
- Oultet Pressure: 2.1~12.5barg
- Flow rate: 70-4000 m³/min
- Air Quality: 100% Oil-Free
✓ 100% oil-free air
✓ High-volume continuous airflow
✓ Suitable for large aeration systems
✓ Designed for stable, long-term operation
Choose the Right Compressor for Your Aeration System
Every wastewater treatment plant has different airflow, pressure and operating requirements. Compare Sollant’s low-pressure screw and centrifugal air compressors below to find the solution that best matches your application.
| Compressor Type | Single Stage Low-pressure Air Compressor | Two Stage Low-Pressure Air Compressor | Centrifugal Air Compressor |
| Pressure Range | 3 / 4 / 5 bar | 4 / 5 bar | 0.6–12 barg |
| Air Flow | 2.06–59.78 m³/min | 2.55–67.95 m³/min | 45–82 m³/min |
| Air Quality | Oil-injected | Oil-injected | 100% Oil-Free |
| Compression | Single-stage | Two-stage | Centrifugal |
| Best For | Low-pressure aeration | Efficient continuous aeration | Large-volume aeration |
| Key Advantage | Energy-efficient low-pressure operation | Efficiency + long-hour operation | High airflow + oil-free air |
| Typical Application | Small to medium wastewater plants | Medium to large wastewater plants | Large-scale wastewater plants |
| Operating Profile | Continuous operation | Continuous operation | Continuous high-volume operation |
Not sure which wastewater treatment air compressor you need?
Send us your required airflow and pressure. Our application engineers will recommend a suitable compressor solution for your plant.
Why Use Low-Pressure Air Compressors
for Wastewater Aeration?
Match Air Pressure to the Actual Aeration Requirement
Wastewater aeration systems typically require high airflow at relatively low pressure, rather than high-pressure compressed air. Using a compressor that matches the actual pressure and airflow requirements can help avoid unnecessary compression energy and reduce operating costs.
① Lower Energy
Higher pressure requires more compression power.
If your aeration system only requires 3–5 bar, operating a conventional compressor at a higher pressure can result in unnecessary energy consumption. Sollant low-pressure screw compressors are designed to deliver the required airflow at the pressure your aeration system actually needs.
Result: Lower energy consumption and lower operating costs.
② Stable Airflow
Biological wastewater treatment relies on a continuous oxygen supply. Unstable or insufficient airflow can affect aeration performance and biological treatment efficiency.
Sollant low-pressure compressors provide stable, continuous compressed air for aeration tanks, helping maintain consistent air delivery throughout plant operation.
Result: More reliable aeration and stable treatment performance.
③ Better Efficiency
A compressor should not be selected simply by its maximum pressure. The ideal solution should match:
Required Airflow + Required Pressure + Operating Hours + Load Profile
By selecting a compressor specifically for low-pressure aeration, the system can operate closer to its actual process requirements instead of generating pressure that is not needed.
Result: Better compressor efficiency and optimized total operating cost.
④ Continuous Operation
Wastewater treatment plants often operate continuously, making compressor reliability and service life critical.
Sollant’s SLTL-75S and SLTL-75T low-pressure screw compressors are designed for continuous industrial operation, providing stable air supply for long-running aeration systems.
Result: Reliable operation with reduced downtime risk.
Need Help Selecting the Right Compressor?
Send us your airflow, pressure, water depth and operating hours. Our engineers can recommend the most suitable low-pressure compressor for your wastewater treatment system.
Compressed Air Applications in Wastewater Treatment
Each application has distinct pressure, flow, and air-quality requirements. Sollant’s product range covers them all.
Activated Sludge Aeration
The most energy-intensive process in any plant. Fine-bubble diffusers fed by variable-speed oil-free blowers supply the continuous oxygen flow that aerobic bacteria need to break down BOD — without contaminating the water with oil.
Membrane Bioreactor (MBR)
MBR systems require two things from aeration: sustained DO levels for microbial activity, and steady membrane scouring to prevent fouling. Pressure precision and flow consistency are critical to membrane lifespan and effluent quality.
Moving Bed Biofilm Reactor (MBBR)
The biofilm carriers must remain continuously suspended throughout the reactor. Air supply is the sole driving force for maintaining the circulation of the packing material and maximizing surface contact between the wastewater and the biofilm.
Sequencing Batch Reactor (SBR)
Lagoon diffused aeration offers far lower energy consumption than surface aerators. SBR systems operate in timed aeration cycles — controlled blower staging with fixed-speed units delivers competitive cost-per-treated-volume performance.
Sludge Digestion & Biogas
Even in anaerobic digestion, blowers handle sludge mixing and conditioning. The resulting biogas can be captured and recompressed for on-site power generation, reducing net operating costs and carbon footprint.
Instrument & Control Air
Every pneumatic valve, DO transmitter, and positioner in a modern plant runs on clean, dry instrument air. This circuit must be the most reliable in the facility — a loss of control air can halt the entire plant.
Ready to Optimise Your Aeration System?
Tell us your flow rates, operating pressure, and site conditions. Our application engineers will size the right solution and calculate your projected energy savings.
Related Products
Why Sollant
Built for the Demands of Water Treatment
Solutions Matched to Your Application
Compare single-stage low-pressure screw, two-stage low-pressure screw and oil-free centrifugal compressors based on your required pressure, airflow and air quality. We help you select equipment for your specific application rather than offer a one-size-fits-all solution.
Energy-Focused Equipment Selection
Evaluate compressor options at your actual operating conditions. Our selection approach considers pressure, airflow and running hours to help you compare energy consumption and identify a suitable configuration for long-term operation.
Customized for Your Project
Get a configuration based on your installation and operating requirements. Discuss power supply, cooling method, equipment layout and connection requirements with our team, with the final customization scope confirmed before production.
22 Years of Export Experience
With equipment exported to more than 100 countries, Sollant brings international supply experience to your project. We work with overseas customers to confirm equipment specifications and delivery requirements before shipment.
Manufacturing Capacity & Quality Credentials
With an annual production capacity of 2,000 machines, Sollant supports equipment supply for projects of different scales. ISO and applicable CE documentation can be provided for review, subject to the selected equipment and certification scope.
Compressor & Air Treatment Options
Source compressors and related air treatment equipment from one supplier. Where your process requires additional drying or filtration, we can discuss compatible equipment as part of your air supply configuration.
What the Customer Says
“Sollant’s variable-frequency air compressors operate stably with low noise levels; their energy consumption has dropped by nearly 30% compared to before, significantly reducing our production costs.”
James Wilson, Production Manager
“Sollant’s equipment demonstrates exceptional stability; having operated continuously at full load for 24 hours without a single abnormal shutdown, it serves as our most trusted source of power support.”
Miller, Equipment Supervisor
“The service team is professional and highly responsive. The equipment has been in operation for over two years, demonstrating stable overall performance, a low failure rate, and low noise levels; they are a trustworthy partner.”
Eric Wright, Technical Director
Typical Customer Applications
Industrial Water Treatment Station Upgrade, Southeast Asia
Background:An industrial water treatment station in Southeast Asia used Roots equipment for air supply. It suffered high power consumption, loud noise and oil contamination risk which threatened biochemical stability. SLT-600C oil-free centrifugal air compressor was selected for replacement.
Solution:1 sets SLT-600C centrifugal air compressors . Pressure 0.6~12 barg, flow 45~82 m³/min. Equipped with VFD to adjust airflow and supply oil-free compressed air for biochemical aeration.
Key Benefits
- 100% oil-free compressed air to protect microbes and stable water quality.
- Around 25% energy saving and lower noise.
- 24/7 continuous air supply.
- International standard, English documents and remote commissioning available.
FAQ About Air Compressors for Wastewater Treatment
The right compressor depends on the required airflow, operating pressure, plant capacity and operating profile. For low-pressure aeration applications, Sollant offers low-pressure screw compressors such as the SLTL-75S and SLTL-75T. For large wastewater treatment plants requiring high-volume, continuous and oil-free air, the SLT-600C centrifugal compressor is an ideal solution.
The required pressure depends on factors such as water depth, diffuser type, piping losses, valves and system resistance. Many aeration systems operate within a relatively low-pressure range. Sollant provides low-pressure screw compressor solutions at 3, 4 and 5 bar, as well as centrifugal solutions covering 0.6–12 barg.
For accurate selection, we recommend providing your required airflow, water depth and operating pressure.
Wastewater aeration generally requires large airflow at relatively low pressure. If the compressor operates at a higher pressure than the aeration system requires, additional compression energy may be wasted.
A properly sized low-pressure compressor can match the actual process requirements, helping improve energy efficiency and reduce operating costs.
Both are designed for low-pressure wastewater aeration, but they use different compression configurations.
The SLTL-75S uses single-stage compression and operates at 3/4/5 bar, with airflow from 2.06–59.78 m³/min.
The SLTL-75T uses two-stage compression and operates at 4/5 bar, with airflow from 2.55–67.95 m³/min. Its two-stage design is optimized for efficient low-pressure operation and long-hour continuous service.
Our engineers can recommend the appropriate model based on your airflow and pressure requirements.
A centrifugal compressor is particularly suitable for large wastewater treatment plants requiring high-volume, continuous air supply.
The Sollant SLT-600C provides 45–82 m³/min airflow and a pressure range of 0.6–12 barg. It provides 100% oil-free air and is designed for continuous high-volume aeration applications.
The required air quality depends on the specific wastewater treatment process and project requirements. For applications where oil-free air is required, Sollant offers the SLT-600C oil-free centrifugal compressor, providing 100% oil-free compressed air for high-volume aeration.
If you have specific air-quality requirements, our engineers can recommend the appropriate compressor configuration.
Compressor airflow should be determined based on the aeration process, oxygen demand, tank volume, water depth, diffuser efficiency and operating conditions.
The required airflow should not be selected based only on the compressor size or motor power. For a more accurate recommendation, provide your required airflow or oxygen demand, operating pressure, water depth and aeration system details.
Yes. Sollant provides customized compressed air solutions based on the customer’s operating requirements. We can evaluate factors such as airflow, pressure, voltage, frequency, ambient conditions, installation environment and control requirements to recommend a suitable compressor configuration.
For project-based applications, you can send us your technical specifications or equipment requirements for engineering evaluation.
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