---
title: "Water restoration for treatment plants | Alchemal"
url: "https://alchemal.com/wastewater/who-we-serve/municipal-treatment-plants/"
description: "Hold dissolved oxygen at setpoint under load, keep nitrification complete, and trim the aeration bill. Measured against a baseline, inside your permit."
source: "Alchemal — alchemal.com"
---
# Water restoration for municipal treatment plants

You answer to a permit, a council, and the neighbors at the fence line, and aeration is the largest line on your power bill. When dissolved oxygen sags under load, nitrification stalls, the sludge stops settling, and the numbers you report get harder to hold. You have no time for a pitch, which suits us.

## The problems we see on your water

- [When aeration cannot keep up: low dissolved oxygen under load When the load climbs and the blowers cannot hold dissolved oxygen at setpoint, the culture slows and treatment falls behind. See how oxygen transfer changes the math.](https://alchemal.com/problems/aeration-cant-keep-up-load/)
- [Incomplete nitrification: ammonia riding through on the permit Nitrification is the oxygen-hungry step, and its slow-growing bacteria stall first when DO sags, so ammonia rides through. See how steady oxygen keeps the conversion complete.](https://alchemal.com/problems/incomplete-nitrification-ammonia/)
- [Filamentous bulking: sludge that will not settle When the basin runs short of oxygen, filament-forming bacteria can take over and keep the sludge from settling. See where holding oxygen shifts the balance back, and where it does not.](https://alchemal.com/problems/filamentous-bulking-poor-settling/)
- [The energy cost of aeration: paying for oxygen that never dissolves Aeration is usually the largest power draw at a plant, and coarse bubbles lose much of it at the surface. See how transfer efficiency, not blower size, sets the bill.](https://alchemal.com/problems/aeration-energy-cost/)
- [Wet weather and shock loads: when the demand arrives all at once A storm surge or a sudden slug of load can crash dissolved oxygen faster than the blowers recover. See how held oxygen gives the basin more headroom through a peak.](https://alchemal.com/problems/wet-weather-shock-loads/)
- [Headworks and basin odor: hydrogen sulfide off a plant that ran short of oxygen A plant's rotten-egg odor is usually hydrogen sulfide from anaerobic water in the collection system or a basin. See how holding oxygen shifts the biology off that path.](https://alchemal.com/problems/headworks-basin-odor/)
- [Tightening nitrogen and phosphorus limits: where oxygen helps, and where it does not Nutrient limits keep tightening. Oxygen completes the nitrification half of nitrogen removal; denitrification and phosphorus are separate steps. See where oxygen fits, and where it does not.](https://alchemal.com/problems/tightening-nitrogen-phosphorus-limits/)
- [Treatment lagoon short-circuiting: flow that skips the pond and dead zones that sour A treatment lagoon short-circuits when flow finds a fast path and stagnant corners sour. See how oxygen through the column narrows the dead zones, and where hydraulics are the real fix.](https://alchemal.com/problems/treatment-lagoon-short-circuiting/)

## What Alchemal installs and takes responsibility for

Treatment is biology doing its work, and the biology works at the pace of the oxygen it can breathe. When dissolved oxygen (DO, the oxygen carried in the water) sags below setpoint under load, the culture slows, nitrification stalls so ammonia rides through, and the sludge stops settling. Nanobubble oxygenation raises how much of the oxygen you supply actually dissolves, so the basin holds its setpoint through the column instead of losing it at the surface. It runs continuously alongside the aeration you already have, and nothing about the flow stops.

The proof is the plant’s own readings. We baseline the dissolved oxygen profile and the numbers your permit turns on, ammonia, the settling index, and the treatment measures, then log them against that baseline through a season. An [N-Series](https://alchemal.com/technology/n-series/) unit you own does the work, and where the real limit is tank volume, a hydraulic fault, or a mechanical problem rather than oxygen transfer, the assessment says so before anything is sized. [Stewardship](https://alchemal.com/stewardship/) carries the record from there.

## What the published work shows, and where we need the field

The mechanism has been measured in a treatment reactor. In a pilot comparison, nanobubble aeration reached a higher removal of the organic load than a fine-bubble system, and lifted nitrogen removal as well. The figure, its scope line, and the limit sit on the [wastewater overview](https://alchemal.com/wastewater/), attributed to nanobubble aeration as a mechanism rather than to any Alchemal unit. Our own installations publish their own record as case files, and we are looking for plants willing to help build it on a working basin.

## Proof from plant operators

The first installations for this audience are being instrumented now, and their case files publish when the record is worth reading. The [methodology](https://alchemal.com/technology/how-we-measure/) is already public: what we record, how we calibrate, and how we report what didn't move.

## From your first note to the assessment

1. You describe the water. A specialist reads it, replies in writing, and says whether an assessment makes sense.
2. Your water goes on the schedule. The first assessments and installations are being scheduled now; requests are answered in the order they arrive.
3. The assessment puts a baseline on paper: dissolved oxygen top to bottom, clarity, the condition of the sediment, and a plan with a prediction attached. If oxygenation isn't the right fix, the report says so.

## Questions operators ask

**Will installing this interrupt the plant?**

No. The system installs at the basin or lagoon as it runs and feeds oxygen continuously. Flow, return sludge, and the process schedule all keep going, and the existing aeration stays in place; nothing is added to the water except oxygen.

**How does this fit our permit and process control?**

We integrate with them and never replace them. The permit and your operators govern, and the readings we take, dissolved oxygen, ammonia, and the settling numbers, are chosen to be the kind an operator and an inspector recognize.

**We already run fine-bubble diffusers. Why add this?**

Fine bubbles transfer better than coarse ones and still lose oxygen at the surface and drift and foul as the grid ages. Nanobubbles stay suspended and give their oxygen up in the water, so more of what you supply reaches the culture. We measure whether that holds your setpoint on less aeration rather than promise a figure.

**Can you promise we meet permit?**

No, and a vendor who does is guessing. Whether the effluent meets a limit depends on your load, your basins, and the limits themselves. What we offer is a measured baseline, oxygen held through the column, and a logged record so the direction of the readings is something you can check.

## Start with a conversation.

Describe the water and a specialist replies in writing, before any commitment. Your water, your numbers.

[Get a free assessment](https://alchemal.com/assessment/?water=municipal-treatment-plant) [See the case-file format](https://alchemal.com/technology/how-we-measure/)