1) Biosolids are pumped into Tank 1 and acidified to lower
the pH, thus solubilizing the phosphorus.
2) Low-pH material is pumped through a ceramic membrane, allowing only liquid and solubilized materials to pass.
3) Low- or no-phosphorus material is pumped to dewatering.
4) Solubilized phosphorus solution passes through membrane and is pumped to Tank 2.
5) Lime is added to the phosphorus-rich solution in Tank 2 to raise the pH and precipitate the phosphorus.
6) A second ceramic membrane se
Phosphorus can be a challenge not only in clean-water plant effluent but in biosolids. For facilities looking to land-apply biosolids in areas with naturally phosphorus-rich soils, high P in the material can be an obstacle.
Now, Renewable Nutrients, based in Pinehurst, North...
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