Pumps and blowers
The equipment lineup for process, sludge, and dewatering duty.
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Industry: Wastewater treatment
Aeration Blowers and Compressed Air for Wastewater Treatment
- Since 1978
- Sullair dealer since 1984
- 14 locations
- under 2 hour response
Aeration Spec Plate
- Technologies
- PD, screw, turbo
- Energy share
- Aeration 50 to 60% (EPA)
- Turndown
- 2:1 turbo, 4:1 screw
- Controls
- DO setpoint, VFD
- Since
- Brabazon, 1978
Which blower technology gives me the best efficiency and turndown for my aeration basin?
When the power bill climbs every summer and the blowers spend the night blowing off, the plant is paying for turndown it does not have. The technology call follows the load profile: high-speed turbo blowers are the efficiency leaders on large steady loads but turn down only about 2 to 1, screw blowers hold high efficiency across roughly 4 to 1 for swinging diurnal loads, and lobe PD machines remain the simple choice for small and pressure-variable duties. Aeration is worth this attention because EPA guidance puts it at 50 to 60 percent of plant electricity. The estimator below starts from what you run today.
The aeration equipment lineup
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PD Blowers
- Style
- Rotary lobe, tri-lobe
- Strength
- Pressure-stiff, simple
- Turndown
- Wide with VFD
- Use
- Small basins, digesters, grit
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Screw Blowers
- Efficiency
- Up to 30% over lobe PD
- Turndown
- About 4 to 1 with VFD
- Strength
- Efficiency plus flexibility
- Use
- Variable-load aeration
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High-Speed Turbo
- Efficiency
- Highest at design point
- Bearings
- Air foil or magnetic
- Turndown
- About 2 to 1 typical
- Use
- Large steady aeration loads
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Controls and Turndown
- Basis
- DO setpoint control
- Hardware
- VFDs, valves, DO probes
- Payback
- Often before new iron
- Use
- Any existing blower room
45 + Years in Business
14 Midwest Locations
4.7 Star Google Rating
Blower energy savings estimator
Enter what runs today. The output is an annual energy estimate and the savings range a higher-efficiency or VSD blower typically captures. Planning-level math from your inputs; a logged evaluation confirms it.
Estimated annual energy and savings
Enter your blower type, horsepower, hours, and rate to see the annual numbers.
Run the numbers yourself
- CFM calculator: check the compressed air demand for plant tools, actuators, and instrument drops alongside your aeration blowers.
- Air receiver tank calculator: size receivers for the plant air system that supports valves and pneumatic controls around the basins.
- Compressed air leak calculator: put a dollar figure on leaks in the plant air header so energy is not lost on top of the aeration bill.
What compressed air really costs
- 10% of US industrial electricity goes to compressed air Source: US DOE Compressed Air Sourcebook
- 20 to 30% of compressed air is typically lost to leaks Source: US DOE Compressed Air Sourcebook
- 75% of ten year compressor cost is energy, not purchase price Source: CAGI life cycle cost data
- under 2 hr average emergency response across our territory Source: Brabazon dispatch
Where treatment plants use blowers and pumps
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Activated sludge aeration
The basin blowers that dominate the plant power bill.
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Digester mixing
Gas mixing and aeration air for stable digestion.
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Channel aeration
Keeping influent channels fresh and solids moving.
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Backwash
Air scour blowers cleaning filter media on cycle.
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Grit agitation
Aerated grit chamber air keeping organics in flow.
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Filter air scour
Timed high-volume air breaking filter beds loose.
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Odor control
Air movement through scrubbers and biofilters.
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Biosolids
Pumps and air for thickening and dewatering trains.
What decides the aeration power bill
Four facts drive nearly every blower decision at a treatment plant. None of this is gated behind a form.
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Aeration is the energy story
EPA energy guidance for the water sector reports that aeration commonly accounts for 50 to 60 percent of a treatment plant's electricity use. That single number is why blower technology, sizing, and turndown decide the operating budget more than any other mechanical choice in the plant.
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Efficiency versus turndown
Turbo blowers post the best wire-to-air efficiency near their design point but give up range, typically about 2 to 1. Screw blowers hold high efficiency across roughly 4 to 1 turndown. Lobe PD machines are the least efficient of the three but the most forgiving. The right pick follows the load profile, not the brochure number.
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Size to the real diurnal load
Plants are commonly designed for a 20 year flow that has not arrived, so blowers idle along throttled or blowing off, which wastes energy every hour. Sizing from actual diurnal DO demand, with a small unit for night loads, beats one big machine at every plant we have logged.
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DO control closes the loop
A blower is only as efficient as the signal driving it. Dissolved oxygen probes feeding a control loop that trims blower output to the setpoint routinely cut aeration energy on their own, and they are the prerequisite for getting catalog efficiency out of any new blower.
Featured approach for aeration upgrades
For plants with a swinging diurnal load, the configuration we recommend most is a screw blower carrying the day load with a smaller PD or screw unit trimming nights, both on DO setpoint control. Large plants with steady loads justify high-speed turbo machines at the design point. Every path starts with logging what the basin actually demands, and the equipment lives on the pumps and blowers page.
When a turbo replacement is the wrong project: an existing PD blower
with a VFD and a working DO control loop is sometimes the right keep-and-optimize
answer, especially at smaller plants and on digester or grit duty where discharge
pressure moves. If controls tuning captures most of the available savings, we will say
so and quote the controls and service work instead of new iron.
Typical project: aeration keep and optimize
Cutting aeration energy without replacing the blowers
A common scenario is a municipal plant asking for a turbo blower quote to replace three lobe PD units that run throttled around the clock. The right first step is to log the basins for a couple of weeks: often the data shows night demand at a third of day demand, inside what the existing machines can serve with speed control. A typical project then becomes two VFDs, DO probes, and a control loop trimming to setpoint, at a fraction of the turbo capital cost, and the aeration line item on the power bill drops enough to fund the next upgrade. The turbo conversation waits for the plant expansion, when the load will justify it. Brabazon logs the load, specs the controls, and installs the VFDs and blowers for this kind of project.
Plant support across the upper Midwest
Factory-trained technicians support municipal and industrial plants from 14 branches with an under 2 hour average emergency response. Find your nearest branch:
Questions engineers actually ask us
Which blower type is most efficient for aeration?
At a steady load near design, high-speed turbo blowers are the most efficient wire-to-air; across a widely varying load, screw blowers often win because they hold efficiency over about 4 to 1 turndown. Lobe PD blowers trail both on energy but remain the simple, pressure-tolerant choice for small and rough duties.
How much of my plant power bill is aeration?
EPA energy guidance for wastewater puts aeration at 50 to 60 percent of typical treatment plant electricity use. That is why a blower efficiency project usually outranks every other mechanical upgrade in payback, and why the estimator on this page starts from your horsepower and hours.
What is blower turndown and why does it matter?
Turndown is the ratio between maximum and minimum useful output, and it matters because basin demand swings day to night. A blower with 2 to 1 turndown must blow off or cycle when demand drops below half, wasting energy, while a 4 to 1 machine keeps trimming to the DO setpoint.
Should I replace my PD blowers with turbos?
Not automatically: a PD blower with a VFD and a working DO control loop can be the right keep-and-optimize answer, especially at small plants and on digester or grit duty where pressure varies. The replacement case is strongest on large, steady aeration loads running near constant output.
Do VFDs save energy on aeration blowers?
Yes, when demand varies: trimming blower speed to a DO setpoint eliminates blow-off and throttling losses, and on PD machines a VFD is the single best retrofit available. The savings scale with how far and how often your load swings from the design point.
Who services aeration blowers and pumps in the Midwest?
Brabazon services blowers and process pumps for municipal and industrial plants from 14 locations across Wisconsin, Illinois, Minnesota, and Missouri, with an under 2 hour average emergency response. We support operators and consulting engineers from selection through rebuild.
Where to go next
Get your blower room evaluated
Send us the blower nameplates, runtime, and your electric rate. You get back the annual energy picture, the honest keep-or-replace call, and the payback math for each path.