Water 2013, 5(3), 1262-1278; doi:10.3390/w5031262
Article

Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale

Received: 12 June 2013; in revised form: 8 July 2013 / Accepted: 12 August 2013 / Published: 29 August 2013
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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.
Keywords: air stripping; ammonium sulfate; nutrients recovery; urine treatment; struvite
PDF Full-text Download PDF Full-Text [488 KB, uploaded 29 August 2013 13:53 CEST]

Export to BibTeX |
EndNote


MDPI and ACS Style

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.

AMA Style

Morales N, Boehler MA, 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(3):1262-1278.

Chicago/Turabian Style

Morales, Nicolás; Boehler, Marc A.; Buettner, Sandra; Liebi, Christoph; Siegrist, Hansruedi. 2013. "Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale." Water 5, no. 3: 1262-1278.

Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert