Aeration is the bill.
Is our oxygen actually cheaper?
Most vendor calculators take your aeration spend and apply a transfer-efficiency gain to it. That answers the wrong question. This one costs both sides in kilowatt-hours per kilogram of oxygen actually transferred — your blowers after alpha, fouling, temperature and dissolved-oxygen deficit, against our concentrators plus the circulation pump that carries the oxygen into the basin. Sometimes the answer is that your aeration is already efficient and we cannot beat it. The page says so.
The plant and its load
Oxygen demand is what sizes everything here, and oxygen demand comes from the load, not from the flow. On a nitrifying plant the nitrogen term is often larger than the carbonaceous one, which surprises people who size on BOD alone.
- BOD removed
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- Nitrogen nitrified
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- Carbonaceous oxygen demand
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- Nitrogenous oxygen demand
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- Denitrification credit
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- Total oxygen demand
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What you spend today
Every benefit on this page is a cost you already carry, reduced. Nothing here is sold, so there is no revenue line and no margin to credit against — which is why the reality check at the bottom is stated against your own operating budget instead.
- Sludge hauled
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- Annual haulage cost
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- Annual surcharge exposure
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How efficient is your aeration now?
This is the panel the whole page turns on. A diffuser grid is rated in clean water at 20 °C with zero dissolved oxygen; a working basin is none of those things. Applying the nameplate figure to real process water overstates the incumbent by a factor of three or more — which would make our comparison look far better than it deserves.
- Clean-water saturation at your temperature
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- Your aeration, standard rating
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- Your aeration, field derated
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- Your cost per kg O₂ delivered
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- Our cost per kg O₂ delivered
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- Difference
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The oxygen system, and what it costs
The side stream is derived, never entered: water carries only so much dissolved oxygen per pass, so the flow follows from the oxygen duty and the transfer per pass. This is also where the energy case is won or lost — at 40 mg/L added you move 25 m³ of water per kilogram of oxygen delivered; at 20 mg/L you move fifty, and the pump doubles.
- Oxygen supplied
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- Side-stream flow
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- Injector
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- Oxygen plant
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- Plant draw
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- Circulation pump
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Value levers
Every lever except the energy one is scaled by the share of oxygen demand we actually supply — you cannot claim an effect on water you never treated. The energy lever has no slider on purpose: a slider there would let you assume the very thing this page exists to test.
Sensitivity
What actually moves the answer, and by how much. Each assumption is swung across its evidence band, not the full slider range.
What moves the answer
Payback across supplied share and power price
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Take it with you
A one-page analysis you can print, save as PDF, or put in front of a works manager, a finance committee or a board — with the assumptions, the oxygen basis, the provenance of every figure and the pricing caveat attached.
Generate the report
The numbers on this page are already yours — no gate on those. This just puts them into a document and lets us follow up with a real quotation if you want one.
We use this to send the analysis and follow up once. See our privacy policy.Important information
The numbers above are a planning model. These are the terms on which they are offered — they apply to every figure on this page and to the report you generate from it.