Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale
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Datum
2013-09Typ
- Journal Article
ETH Bibliographie
yes
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Abstract
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. Mehr anzeigen
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https://doi.org/10.3929/ethz-b-000076615Publikationsstatus
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MDPIThema
Air stripping; Ammonium sulfate; Nutrients recovery; Urine treatment; StruviteOrganisationseinheit
03832 - Morgenroth, Eberhard / Morgenroth, Eberhard
ETH Bibliographie
yes
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