Struvex® Phosphate Systems by P.C.S
Struvex® is a unique and patented process to recover phosphorus from sewage sludge in the form of plant-available Magnesium Ammonium Phosphate (MAP)
WEC Projects has exclusive African rights to Struvex® technologies.
The process utilises technologies that have been developed based on many years of experience in process development and the construction of MAP plants. The technologies use magnesium salts precipitation downstream of the digestion process as well as maximising MAP recovery rates in a precipitation step upstream of digestion.
Struvex® B(asic) – original process downstream of digestion
MAP is extracted from the sewage sludge and separated after adding magnesium salt and increasing the pH value after digestion.
This process requires the use of Biological-P in wastewater treatment. In addition, the MAP discharge rate is limited, as the viscosity and composition of the digested sludge limits the discharge rates to between 20 and 30%.
The process continues to be useful for plants that do not require increased phosphorus recycling and where sludge will in future be disposed of in mono-incineration plants.
Struvex® A(dvanced) – maximising recovery rates in upstream of digestion
This advanced process is complemented by a hydrolysis process, which substantially increases phosphate concentrations in the initial substrate. Moreover, phosphates are separated upstream of digestion. Combined, these measures achieve considerably higher MAP discharge rates.
Hydrolysis process offerings
- Increased gas yield during digestion
- Increased digestion capacity
- Significantly improved sludge dewatering rates
- It satisfies the required regulations
- Lower “P” concentrations mean that the sludge can continue to be disposed via co-incineration
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