Added-value from innovative value chains by establishing nutrient cycles via struvite |
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| Institution: | 1. Leibniz-Institute for Agricultural Engineering Potsdam-Bornim e.V., Technology Assessment and Substance Cycles, Max-Eyth-Allee 100, 14469 Potsdam, Germany;2. Humboldt-Universität zu Berlin, Department of Agricultural Economics, Division of Horticultural Economics, Philippstraße 13, 10115 Berlin, Germany;3. Humboldt-Universität zu Berlin, Department of Agricultural Economics, Division of Resource Economics, Philippstraße 13, 10115 Berlin, Germany;1. Research Centre for Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong;3. School of Environment and Guangzhou Key Laboratory of Environmental Exposure and Health, Jinan University, Guangzhou 510632, China;1. Department of Chemical, Metallurgy and Materials Engineering, Staatsartillirie Rd, Pretoria West 0183, Tshwane University of Technology, Pretoria, South Africa;2. Council for Scientific and Industrial Research (CSIR), Built Environment (BE), Hydraulic Infrastructure Engineering (HIE), P.O Box 395, Pretoria, 0001, South Africa;3. Department of Environmental Sciences, School of Agriculture and Environmental Sciences, University of South Africa (UNISA), P. O. Box 392, Florida, 1710, South Africa;4. Magalies Water, Scientific Services, Research & Development Division, Erf 3475, Stoffberg Street, Brits, 0250, South Africa;5. School of Engineering, Institute for Infrastructure and Environment, University of Edinburgh, Edinburgh EH9 3JL, United Kingdom;6. Department of Physics and Engineering, University of Zululand, Kwadlangezwa, 3886, South Africa;1. Department of Natural Resource Sciences and McGill School of Environment, McGill University, 21,111 Lakeshore Road, Sainte-Anne-de-Bellevue, QC, Canada;2. Julie Ann Wrigley Global Institute of Sustainability, Arizona State University, Tempe, AZ 85287-5402, USA;3. Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Avenue, St. Paul, MN 55108, USA;4. School of Sustainability, Arizona State University, Tempe, AZ 85287-5502, USA;5. Institute for Sustainable Futures, University of Technology Sydney, P.O. Box 123, Broadway, NSW 2007, Australia;6. School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA;7. US Forest Service, Northern Research Station, Baltimore, MD, USA;8. Ecology, Evolution, and Behavior, University of Minnesota, 1987 Upper Buford Circle, St. Paul, MN 55108, USA;1. Environmental Engineering Department, Marmara University, 34722, Kadikoy, Istanbul, Turkey;2. Environmental Engineering Department, Bartın University, 74100, Bartın, Turkey;1. Department of Reactor Engineering, Faculty of Engineering, Universidad de la República, Julio Herrera y Reissig 565, 11300, Montevideo, Uruguay;2. Department of Industrial Applications, Faculty of Chemical Sciences, Universidad Nacional de Asunción, Ruta Mcal. Estigarribia km 11, 1055, Campus Universitario San Lorenzo, Paraguay |
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| Abstract: | The establishment of nutrient cycles has been widely proposed as a strategy for an efficient management of nutrients such as phosphorus (P). Global reserves of phosphate rocks are limited and are being increasingly depleted. At the same time, P is disposed of via various substance-streams in wastewater treatment. Establishing nutrient cycles may solve these problems and lead to innovative added-value chains with a higher added-value. The objective of this paper is to assess the added-value of P-recovery from sewage sludge via struvite precipitation and its application as fertilizer in Berlin-Brandenburg (Germany). The added-value from struvite precipitation was determined by performing a cost/benefit analysis based on data from standardized questionnaires and interviews with operators of wastewater treatment facilities. Surveys of 146 farmers were used to ascertain what crops were cultivated in the study area and to gauge the willingness of farmers to substitute struvite for conventional mineral P-fertilizer. Benefits from using struvite were found by calculating the fertilizer costs when struvite is substituted for conventional mineral fertilizer. The results indicate that the precipitation of struvite and its use as fertilizer generates added-value gains for wastewater treatment facilities (416,000 €) and for crop producers (35,000 €). In wastewater treatment, struvite precipitation reduces operating costs and yields additional revenues through struvite sales. In crop production, fertilization costs are reduced by substituting struvite for mineral P-, N- and Ca-fertilizers. The distribution of the added-value in the struvite value chain is determined by the marketing strategy of struvite. Farmers may obtain a higher share of added-value if struvite is marketed via direct sale. |
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| Keywords: | Added-value Nutrient cycle Wastewater treatment Phosphorus Phosphorus recovery Struvite |
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