Title: Evaluation and thermodynamic calculation of ureolytic magnesium ammonium phosphate precipitation from UASB effluent at pilot scale
Authors: Desmidt, Evelyn ×
Ghyselbrecht, Karel
Monballiu, Annick
Verstraete, W
Meesschaert, Boudewijn #
Issue Date: Jan-2012
Publisher: Pergamon Press
Series Title: Water Science and Technology vol:65 issue:11 pages:1954-1962
Abstract: The removal of phosphate as magnesium ammonium phosphate (MAP, struvite) has gained a lot of
attention. A novel approach using ureolytic MAP crystallization (pH increase by means of bacterial
ureases) has been tested on the anaerobic effluent of a potato processing company in a pilot plant
and compared with NuReSys® technology (pH increase by means of NaOH). The pilot plant showed a
high phosphate removal efficiency of 83±7%, resulting in a final effluent concentration of
13 ±7 mg· L-1 PO4-P. Calculating the evolution of the saturation index (SI) as a function of the
remaining concentrations of Mg2þ, PO4-P and NH4
þ during precipitation in a batch reactor, resulted in
a good estimation of the effluent PO4-P concentration of the pilot plant, operating under continuous
mode. X-ray diffraction (XRD) analyses confirmed the presence of struvite in the small single crystals
observed during experiments. The operational cost for the ureolytic MAP crystallization treating high
phosphate concentrations (e.g. 100 mg · L-1 PO4-P) was calculated as 3.9 € kg-1 Premoved. This work
shows that the ureolytic MAP crystallization, in combination with an autotrophic nitrogen removal
process, is competitive with the NuReSys® technology in terms of operational cost and removal
efficiency but further research is necessary to obtain larger crystals.
ISSN: 0273-1223
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Microbial and Molecular Systems - miscellaneous
Technologiecluster Bioengineering Technologie
Bioengineering Technology TC, Technology Campus Ostend
× corresponding author
# (joint) last author

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