Technology for P recovery as struvite starting from pig manure digestate with fluidized bed crystallization system (ID:256)

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Input material
Digestate from pig manure, magnesium salt and NaOH
Output product
Struvite / Effluent for discharge
Processing capacity
50 L/h
Technology Status
Advanced development stage
Keywords
struvite
phosphorus
crystallization
fluidized bed
nutrient recovery
Technology description

Residual biomass from the agri-food industry is a potential source of bioenergy and bioproducts. The research and application of biological processes, thermo-chemicals and chemicals to obtain energy, high value-added products and  biofuels  from  organic  and  biomass  waste  was  considered.  With  the  aim  of  increasing  the  efficiency  of  the processes and obtaining more competitive, higher quality/purity products at a lower cost. Among these actions, the obtaining of struvite from digestate obtained in the anaerobic digestion of pig manure was studied.
The  crystallization  of  nitrogen  and  phosphorus  in  the  form  of  magnesium  ammonium  phosphate  hexahydrate (MgNH4 PO4·6H2O)  also  known  as  MAP  or  struvite,  is  one  of  the  possible  techniques  used  to  eliminate  and/or recover nutrients from the digestate, obtaining a product that can be applicable as a base in biofertilizers of high quality.
Fluidized bed crystallization is a process in which a solution circulates through a crystallizer in which the crystals are suspended by the rising fluid. The flow is such that the crystal does not deposit or flow out of the crystallization reactor, which allows the correct growth of the crystal due to the optimal contact between all the reagents that are part of the process.
The technology has been demonstrated at a sufficiently relevant scale (crystallisation reactor with a capacity of 50 L), so that the results can be used for subsequent implementation on an industrial scale.

Linked ProductStruvite from digestate and manure by "REVAWASTE" process, ID:250

 

Basic information

Vendor:
Country:
Spain
Technology main category:
Phosphorus precipitation from liquid manure, waste water and drain water
Technology subcategory:
Phosphorus precipitation from manure/digestate

Languages

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