TECHNOLOGY

SWIG manufactures a variety of engineered granular media products designed for nutrient and color removal in stormwater and surface waters.

Phosphorus Elimination System Media

In the Phosphorus Elimination System (PES), nutrient-rich water is pumped and distributed over a vegetated bed. The water flows vertically through SWIG’s proprietary engineered media where phosphorus is adsorbed. Treated water is collected in an underdrain pipe and then discharged. Using our system, there are no toxic chemicals and no by-products. Other than the pumps used to transport the water to and from the system and the auto-samplers to document nutrient removal, the system is completely passive, making it highly resilient to natural events (e.g. cyclones). Phosphorus is permanently chemically bound to the PES media. Using a circular economy approach, PES media is derived from materials that are ordinarily landfilled. Media lifetime can be engineered to range from 5 to 20 years. Spent media is removed at the end of its useful life and used as an ideal soil amendment, as the bound phosphorus does not leach but is available to plant roots. In the ONE system, the media is optimized for nitrification, with denitrification (transformation to nitrogen gas) in an additional layer.

 

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  • Treats high influent TP concentrations up to 3.0 mg/l while maintaining effluent concentrations <0.1 mg/l.

  • Treats low influent TP concentrations ~0.3 mg/l while main-taining even lower effluent concentrations of 0.05 mg/l or less.

  • Effectively removes suspended sediments, pathogens, metals, PAHs, PCBs, and EDCs, providing a comprehensive solution for water treatment.

Industry-leading Removal Rates*

  • Total Phosphorus: 85-95%

  • Total Nitrogen: 20%-30%

  • TSS: 98-99%

  • Metals: 80-95%

*Based on 25-year project lifetime removal

Phosphorus Elimination System Media + Enhanced Nitrogen Removal

  • Uses the PES media layer which also efficiently converts Organic Nitrogen and Ammonium into Nitrate.

  • Nitrate then removed by denitrification in lower deep media layer supplemented with organic amendments.

Industry-leading Removal Rates*

  • Total Nitrogen: 55%-65%

*Based on 20-year project lifetime removal

Phosphorus Elimination System Media + Enhanced Color Removal

  • PES media amended with non-toxic additives to increase color removal and organic N adsorption.

  • Only passive treatment media with a proven lifetime expectancy of 10 years before needing replacement.

Industry-leading Removal Rates*

  • Total Color: 80% PCU

*Based on 10-year project lifetime removal

Results and Longevity Proven

  • Only media manufacturer that accelerates media loading up to 20-year equivalent nutrient loads to confirm lifetime expectancy.

  • Our state-of-the-art research facility is used to optimize media performance for each application.

SWIG applies a cradle-to-cradle approach for all of its media at the end of their useful lifetime. We have agricultural sector contacts who reuse our media as an additive to planting soil mixes.