RT info:eu-repo/semantics/article
T1 Recovery of organic carbon from municipal mixed waste compost for the production of fertilizers
A1 Fernández Delgado, Marina
A1 Amo Mateos, Esther del
A1 Lucas Yagüe, Susana
A1 García Cubero, María Teresa
A1 Coca Sanz, Mónica
K1 Carbono orgánico
K1 Compost de residuos mixtos
K1 Fertilizantes
K1 23 Química
K1 33 Ciencias Tecnológicas
AB Nowadays, the extensive use of inorganic fertilizers has increased the salinity of soil and decreased optimal assimilation of nutrients by crops. Organic carbon is basic for controlling the nutrient level in soil and nutrient assimilation by plants. The objective of this study was to develop a process for recovering organic carbon using compost from mixed municipal waste as raw material. The use of fertilizers from organic residues could replace mineral fertilizers, contributing to resources preservation and recycling of organic matter. In this way, a Taguchi experimental design was proposed to select the most suitable operating conditions for recovering organic carbon from the organic residue. The variable factors were the solid:liquid ratio, type of solvent, extraction time, and particle size. The optimum extraction conditions were: solid:liquid ratio 1:2.5, 1 M potassium hydroxide (KOH), 72 h, and particle size > 1 mm. Subsequent experiments concluded that separating the mixed municipal waste compost (MMWC) by fractions of different particle sizes before extraction process is not recommended. Under these conditions, the total organic carbon concentration in the extract was 6.9% w/w, of which the content of humic acids was 47.6%. On the other hand, the extract complies with the legal requirements of Regulation (EU) 2019/1009 for fertilizing products regarding composition. Germination tests were carried out to analyze the phytotoxic effects of organic extracts. Finally, a preliminary economic study showed the viability for a production plant with a capacity of 300 kg/h of MMWC. The production of liquid fertilizer was 200 L per 100 kg of dry compost, and the estimated sale price to obtain economic benefits was 1 €/L of fertilizer for a plant whose total investment cost was 1,600 k€.
PB Elsevier
SN 0959-6526
YR 2020
FD 2020
LK https://uvadoc.uva.es/handle/10324/46789
UL https://uvadoc.uva.es/handle/10324/46789
LA eng
NO Journal of Cleaner Production, 2020, vol. 265, p. 121805
NO Producción Científica
DS UVaDOC
RD 29-abr-2024