Analysis of urban agriculture solid waste in the frame of circular economy : case study of tomato crop in integrated rooftop greenhouse
Manríquez-Altamirano, Ana (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Sierra-Pérez, Jorge (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Muñoz Odina, Pere (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Gabarrell Durany, Xavier (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental

Data:	2020
Resum:	Within urban agriculture (UA), integrated rooftop greenhouses (i-RTG) have great growth potential as they offer multiple benefits. Currently it is intended to improve environmental benefits by taking advantage of the water, nutrients and gases flows. On the other hand, solid waste (SW) generated by the UA is a new type of waste within cities that has not well been classified or quantified for its use. This could become a new problem for the waste management system within cities in the future, mainly the organic fraction. The objective of this research is to identify what type of i-RTG SW has the potential to be used from a circular economy (CE) perspective and propose a type of management for its material valorization. The results of the case study show that, of the SW generated in i-RTG, the biomass has the greatest potential to be used locally as an eco-material, particularly the tomato stems. Its use is proposed as a substrate for two experimental lettuce crops in i-RTG. The results show that tomato stems have a better yield as a substrate after a prewash treatment, since at first the values of electrical conductivity (EC) are very high with respect to the control substrate, which is expanded perlite. In conclusion, we can say that it is possible to increase the environmental benefits of i-RTG by taking advantage of its biomass locally, helping to foresee a possible future problem regarding the management of the residual biomass of i-RTG within cities. In this way, the paradigm about the perception of the SW of the UA could be changed to give them a by-product treatment from the beginning.
Ajuts:	Ministerio de Economía y Competitividad CTM2016-75772-C3-1-R Ministerio de Economía y Competitividad MDM-2015-0552 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1683
Nota:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Integrated rooftop greenhouse ; Agro-urban solid waste ; Circular economy ; Tomato stems ; Organic waste substrat
Publicat a:	Science of the total environment, Vol. 734 (September 2020) , art. 139375, ISSN 1879-1026

DOI: 10.1016/j.scitotenv.2020.139375
PMID: 32460077

Article. Postprint 33 p, 660.7 KB

Supplementary material 6 p, 310.6 KB

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