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Lagoon total nitrogen removal
NitrOx®+D
For the most stringent TN limits, the NitrOx®+D denitrification reactor concentrates denitrifying bacteria with a supplemental carbon feed and mixer to achieve ultra-low effluent TN.
NitrOx Reactor I · NitrOx Reactor II · NitrOx+D Reactor
Small footprint. Easy operation.
Select a component to zoom in and see what it does.
Three reactors, one compact footprint
NitrOx Reactors I and II nitrify ammonia to nitrate. The NitrOx+D reactor then denitrifies nitrate to nitrogen gas. Select a component to see how.
01 / NitrOx Reactor I
Foam Control Sprayer
Sprays down surface foam so the reactors run clean, with no operator attention needed.
02 / NitrOx Reactor I
Ares Aeration®
Retrievable Ares aerators mix and oxygenate to fuel the nitrifying bacteria that convert ammonia to nitrate.
03 / NitrOx Reactor II
High Surface Area Media
NitroHive media concentrate nitrifiers, 10–20 times more than a typical MBBR, to finish nitrification before the +D reactor.
04 / NitrOx Reactor II
Floating Insulated Cover
Floats over the media zone to hold in heat for reliable treatment in cold weather.
05 / NitrOx+D Reactor
Media Retention Sieve
Keeps the media in the +D reactor, where denitrifying bacteria are concentrated, while treated water flows on to discharge.
06 / NitrOx+D Reactor
Tank Mixer
Mixes the +D reactor with a supplemental carbon feed, so denitrifying bacteria convert nitrate to nitrogen gas and reach ultra-low effluent TN.
NitrOx®+R lagoon recirculation
Lower cost. Easier operation.
When your permit requires TN reduction, NitrOx + Recirculation is the simple, cost-effective solution. Select a component to zoom in.
Recirculation, at a glance
Nitrate-rich water is recirculated from the NitrOx Reactor to a small anoxic zone at the influent, where mixing encourages denitrifying bacteria to convert nitrate to nitrogen gas. Add NitrOx+D for the lowest TN.
01 / NitrOx+R
Anoxic Zone
A small anoxic zone at the influent, where mixing encourages denitrifying bacteria to convert recirculated nitrate to nitrogen gas.
02 / Existing lagoon
Aeration for BOD Removal
Aerated lagoon cells remove BOD before the water reaches the NitrOx Reactor.
03 / NitrOx+R
Recirculation Pump Station
Returns nitrate-rich water from the NitrOx Reactor to the anoxic zone at the front of the lagoon.
04 / NitrOx Reactor
NitrOx Ammonia Removal
Nitrifies ammonia to nitrate, to non-detect ammonia in any weather.
05 / Denitrification
Optional NitrOx+D
For the tightest TN limits, the +D reactor removes nitrate to very low levels: less than 10 mg/L TN, guaranteed.
Benefits of recirculation
- Process stabilization
- Improved nitrification
- Algae reduction
- Lower nitrate levels
- Increased alkalinity
How it works
Nitrify. Then denitrify.
NitrOx® reactors convert toxic ammonia to nitrate. For TN limits, denitrifying bacteria then convert nitrate to nitrogen gas, which is released harmlessly into the atmosphere.
With NitrOx®+R, nitrate-rich water is recirculated to a small anoxic zone at the lagoon influent. With NitrOx®+D, a dedicated denitrification reactor with a supplemental carbon feed and mixer takes TN to ultra-low levels.
- Low TNDedicated denitrification volume and controlled hydraulics remove nitrate to very low levels: less than 10 mg/L TN, guaranteed.
- Operationally simpleEngineered for ease. Consistent results with minimal time or effort.
- Measurable controlOptional ORP/NOx probes help operators target the sweet spot without overdosing carbon.
The NitrOx® playbook
Which limit are you solving?
Start with NitrOx® and add only what your permit requires. Triplepoint designs the process around your facility.
- Start with NitrOx® Ammonia to non-detect Add NitrOx for reliable nitrification in any weather.
- Add anoxic + recirculation NitrOx®+R Moderate TN limit of 15 mg/L Add a front anoxic zone and recirculation to the NitrOx Reactor.
- AddThis page NitrOx®+D Tight TN limit of 10 mg/L Add the +D denitrification reactor to achieve the lowest possible TN.
- Discharge
Ammonia + total nitrogen removal
Download the NitrOx® brochure.
See how NitrOx®, NitrOx®+R and NitrOx®+D help your lagoon meet low effluent limits for ammonia, nitrate and total nitrogen.
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Proven performance. Guaranteed results.
Less than 10 mg/L TN, guaranteed.
We back every system with our Technology Performance Guarantee: if we say it will work, we make sure it does. From first design to final install, we stand behind our process, our products and our people.
NitrOx+D questions
Common questions.
Do we need NitrOx®+R or NitrOx®+D?
It depends on your TN limit. NitrOx®+R adds a front anoxic zone and recirculation for a moderate TN limit of 15 mg/L. NitrOx®+D adds a dedicated denitrification reactor for a tight TN limit of 10 mg/L. We'll design the process around your permit.
How low can NitrOx®+D take total nitrogen?
Less than 10 mg/L TN, guaranteed. Dedicated denitrification volume and controlled hydraulics remove nitrate to very low levels.
How is carbon dosing controlled?
Optional ORP/NOx probes help operators target the sweet spot without overdosing carbon.
Does NitrOx®+D also handle ammonia?
Yes. NitrOx Reactors I and II nitrify ammonia to nitrate, to non-detect ammonia effluent in any weather, before the +D reactor denitrifies. See NitrOx® →
We're ready to help
Talk to a lagoon nitrogen specialist.
Share your ammonia and TN limits, flows and timeline. We'll follow up with options, no obligation.
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