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    Pre-Digestion P-Recovery

    CalPrex®

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    High-Efficiency P-Recovery and Digester Protection

    Fermentation: the Biological Solution for Phosphorus Solubilization

    CalPrex works with high concentrations of soluble phosphorus and is a viable solution for utilities seeking to mitigate operations and maintenance issues related to struvite scaling and poor sludge dewaterability.

    The end recovered product, brushite, is a fertilizer comparable to leading phosphate fertilizers on the market today.

    VIEW OUR PILOT TESTS

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    This high-value solution is for facilities needing phosphorus removal and recovery:

    • Prior to thermal hydrolysis
    • From waste activated sludge and/or primary sludge prior to anaerobic digestion
    • From aerobic or post-aerobic digestion (PAD)

    CalPrex reactor sits between the fermentation tank and gas phase digesters.

    Fermentation for 12-36 hours prior to the anaerobic digester provides a low oxygen environment
    • Facilitates the rapid release of soluble phosphorus in Bio-P sludge along with the dissolution of crystalized and organically-bound phosphorus
    • Over 60% solubilization of P can occur in the fermentation without using any additional chemicals
    • In non-Bio-P plants, up to 40% of the phosphorus solubilizes using a fermentation step

    Fermented sludge is dewatered

    Centrate is sent to the CalPrex reactor

    • Centrate precipitates the dissolved phosphorus with the addition of calcium hydroxide
    • Maintains the solution around 6.5 pH
    • Recovers phosphorus as a brushite crystal (CaHPO4•2H2O)

    Contact Centrisys/CNP for pilot testing capabilities.

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    THE BENEFITS

    Icon-CNP-Disposal
    Reduce Disposal Costs up to 50%
    Icon-CNP-Digester
    Divert Over 70% of the Soluble P from the Digester
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    Reduce up to 50% of the Total P in Biosolids
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    Reduce Struvite Buildup in the Digester
    Icon-CNP-Ammonia
    No Ammonium Required
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    Create a Vaulable Fertilizer from Brushite
     
    The CalPrex® technology is licensed by Nutrient Recovery and Upcycling LLC.
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    Available Literature

    Process

    CalPrex

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    Process

    CalPrex WRF Pilot Project

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    Company

    Advanced Biosolids Treatment

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    Bio

    Centrisys/CNP Company Backgrounder

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