2024-03-29T00:36:01Zhttp://buleria.unileon.es/oai/requestoai:buleria.unileon.es:10612/135422024-02-13T11:45:19Zcom_10612_17col_10612_18
Assessment of electrooxidation as pre- and post-treatments for improving anaerobic digestion and stabilisation of waste activated sludge
Arenas Sevillano, Cristian Bernabé
González, Ruben
González, Judith
Cara Jiménez, Jorge
Papaharalabos, George
Gómez Barrios, Xiomar Arleth
Martínez, E. Judith
Ingenieria Quimica
Facultad de Ciencias Biologicas y Ambientales
Bioquímica
Ecología. Medio ambiente
Ingeniería química
Electrochemical oxidation
Sludge management
Solubilisation
Digestion performance
Dewaterability
FTIR
8 p.
This study evaluates the effects of electro-oxidation as a means for enhancing sludge stabilisation. Boron-doped diamond electrodes were used to treat waste activated sludge and digestate under different operating parameters (current density, conductivity, pH, and time). Electro-oxidation runs affected the solubilisation of organic matter, which seemed to improve anaerobic digestion and dewaterability characteristics.
Among the tested parameters, pre-treating sludge via electro-oxidation under alkaline conditions (Treatment T5) resulted in the highest increase in soluble organic material compared to that in the control, with total organic carbon (TOC) and soluble chemical oxygen demand (COD) values of 2753 and 7819 mg L−1, respectively (control TOC and COD values were 385 and 1073 mg L−1). This pretreatment also achieved a high hydrolysis rate (higher concentration in volatile fatty acids) with a concomitant increase in methane yield (approximately 18%). On the other hand, the application of electro-oxidation as a post-treatment for improving digestate dewaterability resulted in noticeable changes in the release of water during drying due to protein and aliphatic matrix modification of the sample.
SI
2021
2021-10-26T08:15:24Z
2021-10-26T08:15:24Z
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
0301-4797
http://hdl.handle.net/10612/13542
10.1016/j.jenvman.2021.112365
eng
info:eu-repo/semantics/openAccess
Elsevier