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Socio-environmental consideration of phosphorus flows in the urban sanitation chain of contrasting cities

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Version 1 2019-05-17, 13:45
journal contribution
posted on 2024-06-13, 13:02 authored by Geneviève S Metson, Steve M Powers, Rebecca L Hale, Jesse S Sayles, Gunilla Öberg, Graham K MacDonald, Yusuke Kuwayama, Nathaniel P Springer, Anthony J Weatherley, Kelly L Hondula, Kristal Jones, Rubel B Chowdhury, Arthur HW Beusen, Alexander F Bouwman
Understanding how cities can transform organic waste into a valuable resource is critical to urban sustainability. The capture and recycling of phosphorus (P), and other essential nutrients, from human excreta is particularly important as an alternative organic fertilizer source for agriculture. However, the complex set of socio-environmental factors influencing urban human excreta management is not yet sufficiently integrated into sustainable P research. Here, we synthesize information about the pathways P can take through urban sanitation systems along with barriers and facilitators to P recycling across cities. We examine five case study cities by using a sanitation chains approach: Accra, Ghana; Buenos Aires, Argentina; Beijing, China; Baltimore, USA; and London, England. Our cross-city comparison shows that London and Baltimore recycle a larger percentage of P from human excreta back to agricultural lands than other cities, and that there is a large diversity in socio-environmental factors that affect the patterns of recycling observed across cities. Our research highlights conditions that may be "necessary but not sufficient" for P recycling, including access to capital resources. Path dependencies of large sanitation infrastructure investments in the Global North contrast with rapidly urbanizing cities in the Global South, which present opportunities for alternative sanitation development pathways. Understanding such city-specific social and environmental barriers to P recycling options could help address multiple interacting societal objectives related to sanitation and provide options for satisfying global agricultural nutrient demand.

History

Journal

Regional environmental change

Volume

18

Pagination

1387-1401

Location

Berlin, Germany

Open access

  • Yes

ISSN

1436-3798

Language

eng

Publication classification

C Journal article, C1.1 Refereed article in a scholarly journal

Copyright notice

2017, The Author(s)

Issue

5

Publisher

Springer