CNP – the future of sludge treatment

Optimize processes, safe resources

Sludge optimization with magnesium ammonium phosphate (MAP process) removal in wastewater treatment plants.

  • Prevention struvite scaling
  • Reduce operation and maintenance costs
  • Recover phosphate

Struvite mineral buildup leads to reduced 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® optimizes the sludge treatment process like no other system.

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

  • Costly, recurring chemical treatments
  • Phosphorus removal after dewatering

Unlike these other systems, AirPrex® is a complete sludge optimization and phosphorus recovery system, which is installed between anaerobic digestion and dewatering. The boundary conditions for struvite precipitation are set by air stripping in the AirPrex® reactor and the addition of a magnesium salt product.

This combination of biological phosphate elimination and the AirPrex system achieves unrivaled
effectiveness in terms of dewatering efficiency and cost savings.

Phosphor regulations affecting treatment plants

The EU commission with regard to phosphorus recycling states the following:

“Recycling of phosphorus: phosphorus is a vital resource for food production, but it has significant security-of-supply risks and its current use involves waste and losses at every stage of its lifecycle…

The commission is considering developing a policy framework on phosphorus to enhance its recycling, foster innovation, improve market conditions and mainstream its sustainable use in EU legislation on fertilizers, food, water and waste.. ”

This decision engages treatment plants to actively monitor and control their phosphate discharges, and AirPrex® can be an excellent tool in this effort.

AirPrex® safes plant operation and maintenance and disposal costs

AirPrex® removes struvite while significantly improving efficiency

The AirPrex® system 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%

By optimizing the sludge and removing most of the phosphate before dewatering, the water bounding effect of the phosphate is mitigated before dewatering. As a result, the dewatering process is more efficient and less polymer is required.

Reduce disposal costs by up to 20%

By optimizing the sludge and removing most of the phosphate before dewatering, the dewatering process is more efficient, allowing for drier cake solids.

Reduce phosphorus recycle load by up to 90%

Eliminating the majority of the P-recycling load thereby increasing the overall efficiency of the biological treatment process.

Reduce maintenance costs by up to 50%

With the AirPrex® struvite removal process, pipe treatment and repairs are minimal to maintain the desired capacity of the digester pipes.

Increase revenue from fertilizer up to 10%

In addition to removing struvite, you can also resell the high phosphate dry solids as fertilizer.

An optimal solution that is easy to implement

Your partners at CNP can easily incorporate this value-producing technology into your operation in any plant setting, including the refitting it to your existing infrastructure.

Contact us to get started today.