Post-Digestion P-Recovery

    AirPrex®

    THE PROBLEM

    Struvite Mineral Buildup Leads to Reduced Plant Capacity

    In wastewater reclamation plants with Biological Phosphorus Removal (BPR), phosphorus accumulates in sludge and releases in a dissolved reactive form (orthophosphate) in an anaerobic condition.
    Elevated orthophosphate levels in sludge causes operational challenges, including:

    • Deterioration of sludge dewaterability
    • Elevated phosphorus load to the wastewater treatment plant due to phosphorus recirculation
    • Uncontrolled formation of struvite (or MAP: magnesium ammonium phosphate) inside pipes and other equipment
    • Reduced digester capacity by struvite build-up inside the anaerobic digester

    AirPrex-Flow-Diagram-wLabels

    THE SOLUTION

    AirPrex Optimizes the Sludge Treatment Process Like No Other System

    AirPrex turns struvite into an opportunity for resource recovery. Struvite, when formed under a controlled environment, can be harvested and utilized as a beneficial fertilizer. AirPrex forms struvite by stripping out CO2, elevates the pH and adds MgCl2 to augment Mg2+. AirPrex installs between the anaerobic digester and the dewatering equipment. The process converts the orthophosphate into struvite crystals, which is harvested from the bottom of the reactor. AirPrex mitigates the unexpected consequence of dewatering Bio-P sludge.
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    THE BENEFITS

    AirPrex Removes Struvite while Significantly Improving Treatment Efficiency

    Icon-CNP-Polymer
    Reduce Polymer Consumption up to 30%
    Icon-CNP-Disposal
    Reduce Disposal Costs up to 20%
    Icon-CNP-Phosphate
    Reduce Phosphate Recycle Load up to 90%
    Icon-CNP-Maintenance
    Reduce Maintenance Costs up to 50%
    Icon-CNP-Struvite
    Increase Revenue from Fertilizer up to 20%
    Icon-CNP-Sodium-Hydroxide
    No Sodium Hydroxide Required
     
    Available Literature

    Process

    AirPrex

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    Process

    AirPrex Installations

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    Company

    Resource Intensification

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    Bio

    CNP Company Backgrounder

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    Reprint

    Struvite Solution

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    Reprint

    Nutrient Award

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