RT Journal Article
T1 Recovery of N and P from urine by struvite precipitation followed by combined stripping with digester sludge liquid at full scale
A1 Morales Pereira, Nicolás
A1 Boehler, Marc Anton
A1 Buettner, Sandra
A1 Liebi, Christoph
A1 Siegrist, Hansruedi
K1 Air stripping
K1 Ammonium sulfate
K1 Nutrients recovery
K1 Urine treatment
K1 Struvite
AB A novel ammonia stripping method, including a CO2 pre-stripper was used to treat a mix of supernatant liquor from an anaerobic digester and urine in order to recycle nitrogen as ammonium sulfate at full-scale in the WWTP Kloten/Opfikon. Waste streams were not generated, since the ammonia was recovered as a marketable nitrogen fertilizer, turning a waste product into a valuable product. The efficiency of this system was increased by means of the addition of pre-treated urine collected separately at EAWAG building. The separation step was performed by the use of water free urinals and urine diversion flush toilets. An increase of 10% in the liquid flux with the addition of the urine translated into a 40% increase of the ammonia concentration in the inlet of the stripping unit. The achievement of these percentages generated a proportional increase in the fertilizer production. The urine pre-treatment was carried out by adding magnesium to produce a precipitate of struvite. The first experiments with the combined treatment showed the feasibility of the combination of the separation and pre-treatment steps
PB MDPI
YR 2013
FD 2013
LK http://hdl.handle.net/10347/21757
UL http://hdl.handle.net/10347/21757
LA eng
NO Morales, N.; Boehler, M.A.; Buettner, S.; Liebi, C.; Siegrist, H. Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale. Water 2013, 5, 1262-1278
NO The authors gratefully thank the WWTP Kloten/Ofikon and the AWEL (environmental protectionoffice of the canton of Zürich), Switzerland. N. Morales acknowledges the fellowship of the SpanishPersonnel Research Training Program (FPI) for international research stay (EEBB-2011-43482)provided by the Spanish Government
DS Minerva
RD 29 abr 2026