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    High-Efficiency Phosphorus Recovery and Digester Protection

    CalPrex® + MagPrex™

    Maximize Phosphorus Recovery with Minimal Sludge Protection

    The CalPrex + MagPrex combination captures 50%+ total phosphorus entering treatment plants, with a minimal addition of chemicals.

    CalPrex-MagPrex-Flow-Diagram-wLabels-2021

    CalPrex Process

    • Harnesses fermentation to acidify bio-P sludge
    • Solubilizes over 65% of phosphorus in the fermentation process
    • Isolates the soluble phosphorus (PO4-P) in the dewatered fermented
      sludge centrate
    • Precipitates soluble phosphorus (PO4-P) by calcium hydroxide in the
      reactor
    • Maintains the solution around 6.5 pH
    • Recovers phosphorus as brushite (CaHPO4· 2H2O), a market-ready,
      high-quality fertilizer

    MagPrex Process

    • Converts the remaining soluble phosphate (PO4-P) in digested sludge to
      struvite (MgNH4PO4· 6H2O)
    • Air strips CO2 and adds magnesium chloride
    • Recovers phosphorus as struvite, a market-ready fertilizer
    • Reduces the phosphorus recirculation by 90%
    PROCESS-CalPrex-MagPrex-CNP-2021

    THE BENEFITS

    CalPrex + MagPrex: A Combined Approach

    Icon-CNP-Phosphate
    Reduce Phosphate Recycle Load up to 90%
    Icon-CNP-Polymer
    Reduce Polymer Consumption up to 30%
    Icon-CNP-Disposal
    Reduce Disposal Costs up to 20%
    Icon-CNP-Maintenance
    Reduce Maintenance Costs up to 50%
    Icon-CNP-Struvite
    Recover Over 50% of Total Phosphorus
    The CalPrex® Technology is licensed by Nutrient Recovery and Upcycling LLC.
     
    Available Literature

    Process

    CalPrex + MagPrex

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    Company

    Advanced Biosolids Treatment

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    Bio

    Centrisys/CNP Company Backgrounder

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