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Article

Nitrogen Recovery from Wastewater: Possibilities, Competition with Other Resources, and Adaptation Pathways

1
Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
2
Waternet, Strategic Centre, Korte Ouderkerkerdijk 7, 1096 AC Amsterdam, The Netherlands
*
Author to whom correspondence should be addressed.
Sustainability 2018, 10(12), 4605; https://doi.org/10.3390/su10124605
Received: 5 October 2018 / Revised: 27 November 2018 / Accepted: 1 December 2018 / Published: 5 December 2018
(This article belongs to the Special Issue Sustainable Wastewater Treatment Systems)
Due to increased food production, the demand for nitrogen and phosphorus as fertilizers grows. Nitrogen-based fertilizers are produced with the Haber–Bosch process through the industrial fixation of N2 into ammonia. Through wastewater treatment, the nitrogen is finally released back to the atmosphere as N2 gas. This nitrogen cycle is characterized by drawbacks. The energy requirement is high, and in the wastewater treatment, nitrogen is mainly converted to N2 gas and lost to the atmosphere. In this study, technologies for nitrogen recovery from wastewater were selected based on four criteria: sustainability (energy use and N2O emissions), the potential to recover nitrogen in an applicable form, the maturity of the technology, and the nitrogen concentration that can be handled by the technology. As in wastewater treatment, the focus is also on the recovery of other resources; the interactions of nitrogen recovery with biogas production, phosphorus recovery, and cellulose recovery were examined. The mutual interference of the several nitrogen recovery technologies was studied using adaptive policy making. The most promising mature technologies that can be incorporated into existing wastewater treatment plants include struvite precipitation, the treatment of digester reject water by air stripping, vacuum membrane filtration, hydrophobic membrane filtration, and treatment of air from thermal sludge drying, resulting respectively in 1.1%, 24%, 75%, 75%, and 2.1% nitrogen recovery for the specific case wastewater treatment plant Amsterdam-West. The effects on sustainability were limited. Higher nitrogen recovery (60%) could be realized by separate urine collection, but this requires a completely new infrastructure for wastewater collection and treatment. It was concluded that different technologies in parallel are required to reach sustainable solutions. Nitrogen recovery does not interfere with the recovery of the other resources. An adaptation pathways map is a good tool to take into account new developments, uncertainties, and different ambitions when choosing technologies for nitrogen recovery. View Full-Text
Keywords: nitrogen; resource recovery; wastewater treatment; energy; sustainability; adaptive policymaking nitrogen; resource recovery; wastewater treatment; energy; sustainability; adaptive policymaking
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MDPI and ACS Style

Van der Hoek, J.P.; Duijff, R.; Reinstra, O. Nitrogen Recovery from Wastewater: Possibilities, Competition with Other Resources, and Adaptation Pathways. Sustainability 2018, 10, 4605. https://doi.org/10.3390/su10124605

AMA Style

Van der Hoek JP, Duijff R, Reinstra O. Nitrogen Recovery from Wastewater: Possibilities, Competition with Other Resources, and Adaptation Pathways. Sustainability. 2018; 10(12):4605. https://doi.org/10.3390/su10124605

Chicago/Turabian Style

Van der Hoek, Jan P., Rogier Duijff, and Otto Reinstra. 2018. "Nitrogen Recovery from Wastewater: Possibilities, Competition with Other Resources, and Adaptation Pathways" Sustainability 10, no. 12: 4605. https://doi.org/10.3390/su10124605

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