Revalorization of Posidonia oceanica Waste for the Thermochemical Production of Biochar
2022
Moltó Berenguer, Julia | Montalbán, Mercedes G. | Nuñez, Samuel S. | Jordá Guijarro, Juana Dolores | Jordá Guijarro, Juana Dolores | Moltó Berenguer, Julia | Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Departamento de Agroquímica y Bioquímica | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos | Ingeniería para la Economía Circular (I4CE)
Every year, many tonnes of Posidonia oceanica are removed from Mediterranean beaches to maintain the quality and pleasure of use of the beaches. Most of this waste ends up in landfills, entailing removal costs. In this work, the Posidonia oceanica material was characterised, and a washing system was developed to obtain biochar. An adequate washing of the starting biomass was shown to play a key role as it led to an over 90% salt content reduction and, therefore, a decrease in conductivity values. The use of biochar as a soil remediator improves soil properties, carbon sequestration, and plant growth. However, not all types of biochars are suitable for this type of application. Therefore, the properties of biochar made from Posidonia oceanica at different temperatures (300, 400, and 500 °C) were studied. All the biochars obtained showed to exceed 10% organic carbon, which is the lower limit to be applied to soils, the maximum percentage having been obtained at 300 °C. In addition, all presented pH values (8.02, 10.32, and 10.38 for the temperatures of 300, 400, and 500 °C, respectively) that were similar to those of other effective biochars for the remediation of acid soils.
Afficher plus [+] Moins [-]The present study was funded by the Ministry of Science and Innovation (Spain) [grant number PID2019-108632RB-I00] and by Prometheus Programme (Spain) [grant number CIPROM/2021/027].
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