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    Post-Digestion P-Recovery

    AirPrex®

      "We've dissolved the partnership with our Germany-based partner to build on the strength of our U.S.-based initiatives and learnings. Changing our nutrient recovery technology's name to MagPrex (previously AirPrex) signifies our commitment to continued innovation and ensures the best efficacy and the best value for all of our North American customers." – Gerhard Forstner, president of CNP

      Learn more about MagPrex™

      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

      MagPrex

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      Process

      MagPrex Installations

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      Company

      Advanced Biosolids Treatment

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      Bio

      Centrisys/CNP Company Backgrounder

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      Reprint

      Struvite Solution

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      Reprint

      Nutrient Award

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