Leading the biotech revolution
in wastewater and biogas

Efficient nitrogen removal from wastewater

Discover the most sustainable and cost-effective methods for nitrogen removal from wastewater and for removing ammonium in wastewater coming from anaerobic reactors.

Why nitrogen removal from wastewater is important

Nitrogen compounds such as nitrate and ammonium need to be removed from industrial wastewater and leachate for several reasons. It can contribute to eutrophication, which depletes oxygen in water bodies and harms aquatic life. High concentrations of ammonium in wastewater also directly poison fish. Both lead to dead fish in the short term, and loss of biodiversity in the long term. Ammonium itself also can be toxic to organisms at high concentrations. Too much nitrate in our drinking water can harm or even kill pregnant women and babies, as it increases the methemoglobin in blood.

All this combined is why environmental regulations become stricter and stricter. Not complying can lead to big (monetary) penalties. Additionally, untreated ammonium in wastewater can interfere with certain industrial processes and lead to operational challenges. Nitrogen removal and ammonium removal from wastewater is thus very important.

Best method for nitrogen removal from wastewater

ANAMMOX® (anaerobic ammonium oxidation) is considered one of the best methods for nitrogen removal and ammonium removal in wastewater. That’s because ANAMMOX® bypasses the need for the separate steps of nitrification and denitrification, combining aspects of both into a single, more efficient process that directly converts ammonium and nitrite to nitrogen gas without first forming nitrate with an organic carbon source (adsorption). This makes it particularly valuable in settings where reducing energy consumption and operational costs are priorities. Current ANAMMOX® installations use up to 60% less energy.

The biological processes in ANAMMOX® also produce significantly less sludge and have a smaller carbon footprint compared to conventional nitrification/denitrification in wastewater treatment. Lastly, ANAMMOX® can be integrated into existing wastewater treatment plants. It is now applied in the food, manure, (petro)chemical, metallurgical and semiconductor industry and used for public leachate treatment.

Highly efficient nitrification in wastewater treatment

Effluent from anaerobic reactors still contains low levels of BOD and possibly ammonia and phosphate. The CIRCOX® bioreactor is a very efficient aerobic system for the treatment of anaerobic effluents. It uses biofilm on a carrier material in an airlift reactor for simultaneous BOD removal and nitrogen removal from wastewater. This compact system for nitrification in wastewater treatment is a fully closed aerobic system with outstanding purification performance. The purified effluent can be directly discharged to surface water. It is also used for nitrogen removal

Find out if CIRCOX® is the most cost-effective solution for your facility

View CIRCOX® advantages and capacity


At Paques, we believe in a cleaner, more sustainable world where innovation in biotechnology plays a crucial role in managing our planet's resources wisely.

If you have any questions or wish to explore what Paques technologies can do for your operations, we encourage you to connect with our team of experts. Our knowledgeable professionals are ready to assist you, offering insights and guidance tailored to your specific needs.

Leading the biotech revolution in wastewater and biogas

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Your inquiry is important to us, and we are eager to assist you in exploring our innovative solutions for biological wastewater and gas treatment.

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We look forward to collaborating with you and hope to build a cleaner, more sustainable world together.

Warm regards,
The Paques Team