CNP Struvite Phosphate Removal

CNP Technologies AirPrex™ – A Complete Solution to the Struvite Problem

AirPrex™ is a complete sludge optimization and phosphorus recovery system that’s installed between anaerobic digestion and sludge dewatering steps. Controlled struvite precipitation is regulated by air stripping in the AirPrex™ reactor with the addition of a magnesium chemical product. The combination of biological phosphate elimination and the AirPrex™ system achieves unrivaled effectiveness in terms of wastewater dewatering efficiency and cost savings.

Optimisation of Sludge Treatment with the Benefit of Phosphate Recovery:

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The Problem
The CNP Solution
Benefits and Savings
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Struvite Causes Reduced Sludge Dewaterability and Wastewater Treatment Plant Capacity

In wastewater treatment plants with biological phosphate elimination, high phosphate concentrations occur in the digester’s anaerobic environment.

As a result, struvite (or MAP: magnesium ammonium phosphate) builds up inside the pipes, pumps and process equipment, causing problems including:

      • Reduced plant capacity due to decreased flow through the digester’s pipes
      • Reduced dewatering efficiency due to increased water bounding effects in the sludge by high phosphate levels
      • Increased phosphate loads in the return liquor, which leads to a less efficient phosphate-elimination process and causes crystallization problems in pipes and pumps
How AirPrex™ Optimises the Sludge Treatment Process Like No Other System

Until now, the main methods of struvite removal have been:

    • Costly, recurring chemical treatment
    • Phosphorus removal after dewatering

Unlike these other systems, AirPrex™ is a complete sludge optimization and phosphorus recovery system that’s installed between anaerobic digestion and sludge dewatering step. The conditions for controlled struvite precipitation are set by air stripping in the AirPrex™ reactor with the addition of a magnesium chemical product. The combination of biological phosphate elimination and the AirPrex™system achieves unrivaled effectiveness in terms of wastewater dewatering efficiency and cost savings.

AirPrex™ Removes Struvite while Significantly Improving Efficiency

The AirPrex™ process has been designed to produce maximum return on investment and make a significant impact on your treatment plant’s cost of operations. The elimination of struvite through this unique process leads to a 90 to 95 percent phosphate reduction in the returned liquor (up to 15 percent related to the incoming P-load).

 

      • Reduce Polymer by up to 30%
      • Reduce Disposal Costs by up to 20%
      • Reduce Phosphorus Recycle Load by up to 90%
      • Reduce Maintenance Costs by up to 50%
      • Increase Revenue up to 10% from Fertiliser