| Title | Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale |
| Publication Type | Journal Article |
| Year of Publication | 2013 |
| Authors | Morales, N, Boehler, MA, Buettner, S, Liebi, C, Siegrist, H |
| Pagination | p. 1262 - 1278; 6 tab.; 4 fig. |
| Date Published | 2013-08-29 |
| Publisher | Molecular Diversity Preservation International, Water Editorial Office, MDPI |
| Place Published | Basel, Switzerland |
| Keywords | ammonia, chemical analysis, chemical treatment, chemicals, nutrients, urine treatment |
| 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. [authors abstract]
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| Notes | With 45 references on p. 1276 - 1278 |
| Custom 1 | 114 |
