Nitrogen reduction

Registered white Rewatec logo.

Boost the performance of your wastewater treatment system with our nitrogen reduction options. Proven and all-natural, these solutions protect public health and the environment from the damaging effects of nutrient contamination.

Rewatec nitrogen reduction septic system
nitrogen reduction septic system total protection
Total protection for peace of mind

Prevents property contamination.

Preserves water quality in lakes and rivers.

Protects public health.

nitrogen reduction septic system residential solutions
Residential solutions with Ecoflo

Easily integrated with our Ecoflo biofilter.

Takes less space than traditional options.

Never damages your landscaping.

Commercial and municipal solutions
Commercial and municipal solutions

Processes tailored to your project’s needs.

Ideal for all treatment systems.

Exceptional results in all seasons.

What is nitrogen reduction?

Nitrogen reduction is a wastewater treatment solution for areas where effluent standards have been strengthened to protect public health and the diversity of delicate ecosystems.

Our nitrogen reduction options are easily integrated with our Ecoflo biofilter or added to the processes of commercial and municipal treatment plants.

They safely convert ammoniacal nitrogen into harmless nitrogen gas, helping keep pollutants out of groundwater and away from the lakes and rivers near your property.

How do our residential nitrogen reduction systems work?

Primary tank

Wastewater first flows into a primary tank. Solids settle on the bottom of the tank and liquids flow into the Ecoflo biofilter for treatment.

Ecoflo biofilter

Wastewater passes through the biofilter, percolating through an organic filtering medium that traps and removes pollutants. Ammoniacal and organic nitrogen are naturally converted into nitrates as part of this process.

After wastewater passes through the filter, it is pumped into a flow divider tank.

nitrogen reduction septic system rewatec

Flow divider and final dispersal

The pressurized flow divider returns one portion of treated wastewater to the primary tank, where nitrates transform into harmless nitrogen gas that is released into the air.

The remaining portion of treated wastewater is discharged and safely returned to the environment.


Residential nitrogen reduction system maintenance

We have a network of local service partners, annually trained by us to maximize the life of your Ecoflo septic system and to protect your investment in your installation.

  • 15-point Ecoflo biofilter inspection
  • filter aeration to promote healthy bacterial activity
  • filter scarification to ensure optimal biofiltration
  • verification of flow divider components and performance

How do our commercial and municipal nitrogen reduction systems work?


Nitrogen that enters a sewer system is mostly in the form of organic compounds, such as those found in urine and fecal material. When these compounds mix with wastewater, a natural process quickly converts them into ammonium.


Nitrogen removal processes can be adapted to any of our commercial and municipal treatment systems:

When wastewater enters a treatment system, specialized bacteria called nitrifiers feed on available ammonium, converting it through a two-step process into a nitrogen compound called nitrate.

Following this process, wastewater is circulated away from the oxygen-rich zone favoured by nitrifiers, and into an anoxic (oxygen-depleted) zone for further treatment.


In the anoxic zone, there is another group of specialized bacteria called denitrifiers.

Denitrifiers do not require dissolved oxygen to breathe. Instead, they use the oxygen molecules attached to nitrate, breaking down the compound and producing harmless nitrogen gas that is released into the air.

nitrogen reduction septic system rewatec

After denitrification, wastewater continues downstream for additional treatment and, later, safe dispersal into the environment.

Our commercial and municipal solutions help you meet the strictest effluent standards by achieving total nitrogen concentrations as low as 0.5 mg/L.

Commercial and municipal nitrogen reduction system maintenance

We have a network of technicians and local service partners, annually trained by us to maximize the life of your commercial or municipal nitrogen reduction system and to protect your investment in your property.

When a technician visits your property, they will:

  • inspect all components, including electromechanical equipment
  • verify treatment performance
  • adjust processes to maximize system performance (when required)

Where do we offer nitrogen reduction systems?

We proudly offer Rewatec nitrogen reduction systems in the following countries:

Get in touch

We are here to help. For more information about our products and services, including their availability around the world and in your home country, please contact our team of experts today.