Leading the biotech revolution
in wastewater and biogas

Biological removal of phosphorus from wastewater

On this page, you’ll discover how and why biological removal of phosphorus from wastewater and biological phosphorus recovery is preferred worldwide.

PHOSPAQ is the most cost-effective way to meet discharge requirements ánd produce valuable, EU-approved fertilizer.

Biological phosphate removal

Phosphorus removal is needed before industrial facilities can discharge wastewater or recycle it. Public water facilities also need a phosphate filter to transform sewage into drinking water. That’s because effluent from anaerobic reactors can still contain low levels of phosphate, BOD and ammonia. The PHOSPAQ post-treatment process removes biologically degradable COD, phosphate (PO43-) and ammonium (NH4+) from wastewater. It takes place in an aerated reactor, which provides optimal conditions for biological conversion of COD and quality struvite formation.

PHOSPAQ combines COD removal, ammonia removal, phosphate removal and phosphorus recovery in one reactor. This biological removal of phosphorus from wastewater deletes up to 95% of the phosphate in wastewater.

Discover if PHOSPAQ is feasible for your facility or

Sustainable phosphorus recovery with PHOSPAQ®

As phosphate becomes scarce, phosphorus recovery becomes more commercially interesting. PHOSPAQ allows facilities to harvest commercial phosphate from wastewater. By adding magnesium oxide, the system filters phosphate in wastewater. It is then transformed into struvite, harvested from the bottom of the reactor and separately contained. Struvite is an excellent slow-release, EU-approved fertilizer. Compared to e.g. dosing of iron salts, PHOSPAQ is a more cost-effective technology for phosphorus recovery.

Effluent polishing with ASTRASAND

To raise the effluent quality of (municipal) wastewater treatment plants, a treatment stage can be added to reduce concentrations of nitrogen, BOD, phosphate and TSS. ASTRASAND® is not only effective in biological removal of phosphorus from wastewater, but also for the final removal of ammonia, nitrate, TSS and BOD. The ASTRASAND® filtration process removes phosphate to levels below 0.15 mg/l respectively. With more than 40 years of experience and 3,500 installations worldwide in sand filtration, Pacques can provide every industrial or public facility with a tailor-made sand filter system that meets all requirements.


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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Thank you for reaching out to Paques

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

A member of our expert team will be in touch shortly to discuss your specific needs and how Paques can help you achieve your environmental and operational goals.

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

Warm regards,
The Paques Team