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Reducing Phosphorous with BLUE PRO® REACTIVE FILTRATION

Updated: May 3

Phosphorus is the nutrient that promotes plant and algae growth in ponds, streams, and lakes across the United States. Algae growth has a profound impact on recreation, human health, animals and livestock, and drinking water. Municipalities, industrial and energy plants who discharge to surface water will likely be required to achieve a low Total Phosphorous limit. This new lower limit may seem unachievable, but it is possible with Blue Pro Reactive Filtration.


Nick Janous - Director of Sales, Nexom (April 21, 2022)


The Blue Pro Reactive Filtration system achieves the industry-lowest phosphorous levels by using both disk filtration and tiny granules of sand that are treated with hydrous ferric oxide (HFO). This treatment method removes the use of chemicals which were historically needed to achieve low levels of phosphorous for effluent standards.


How it works:



The Blue PRO filter is built on Nexom’s own Centra-flo® continuous-backwash sand-filter-process pictured here.

  • Influent is distributed across almost the entire cross-sectional area of the filter near the bottom of the sand column.

  • Water is filtered as it flows upward, and the sand coated with hydrous ferric oxide (HFO) attracts and reacts with the phosphorus and metals. Other hydrous metal salts can be used including aluminum, cerium, lanthanum (rare earth), etc.

  • Sand is moving downward by gravity to an airlift device.

  • While the filtered water exits near the top of the filter, the airlift transports the phosphorus- or metals-laden media up into the wash-box where the discharged HFO coating and adsorbed contaminates are separated from the media. Water velocities in the wash-box are carefully designed to carry away the contaminates while allowing the media to fall to the filter bed.

  • The freshly scrubbed media from the wash-box is recoated with HFO as its cycle begins again.

Source: Meet ultra-low phosphorus limits. Are you facing phosphorus or metals limits that you are unable to meet? (nexom.com)


Phosphorous removal is simplified with the Nexom Blue Pro Reactive Filter. Because of the large reactive surface area of the sand and filters within the media bed, phosphorous is guaranteed to bond and be absorbed by the HFO. Compared to coagulation filtration with the high dosage of aluminum and iron - the Nexom Blue Pro is far superior and environmentally friendly.


Wastewater treatment plants who face new total Phosphorous limits can easily implement a Blue Pro Reactive Filter into their existing footprint. A variety of options are available to meet your peak flow mgd - including freestanding stainless steel to multi-module concrete. Control systems and smaller filters may be mounted on skid systems for mobility or ease of commissioning.


If you are interested in learning more about the Nexom Blue Pro Reactive Filter, please contact Paul Nygaard at the ICS Group. In-person and virtual presentations are offered to answer your phosphorous removal questions.


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