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.
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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:
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- 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
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How AirPrex™ Optimises the Sludge Treatment Process Like No Other System
Until now, the main methods of struvite removal have been:
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- 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).
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- 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
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