The effect of slime accumulated in a long-term operating UASB using crude glycerol to treat S-rich wastewater
Zhou, Xudong (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Fernandez Palacios, Eva (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Dorado, Antoni D. (Universitat Politècnica de Catalunya. Departament d'Enginyeria de Mines)
Lafuente Sancho, Francisco Javier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Gamisans Noguera, Xavier (Universitat Politècnica de Catalunya. Departament d'Enginyeria de Mines)
Gabriel, David (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)

Data:	2024
Resum:	An up-flow anaerobic sludge blanket (UASB) reactor targeting sulfate reduction was operated under a constant TOC/S-SO 4 2− ratio of 1. 5 ± 0. 3 g C/g S for 639 days using crude glycerol as carbon source. A filamentous and fluffy flocculant material, namely slime-like substances (SLS), was gradually accumulated in the bioreactor after the cease of methanogenic activity. The accumulation of SLS was followed by a decrease in the removal efficiencies and a deterioration in the performance. Selected characteristics of SLS were investigated to explore the causes of its formation and the effect of SLS on the UASB performance. Results showed that glycerol fermentation and sulfate reduction processes taking place in the reactor were mainly accomplished in the bottom part of the UASB reactor, as the sludge concentration in the bottom was higher. The accumulation of SLS in the UASB reactor caused sludge flotation that further led to biomass washout, which decreased the sulfate and glycerol removal efficiencies. Batch activity tests performed with granular sludge (GS), slime-covered granular sludge (SCGS) and SLS showed that there was no difference between GS and SLS in the mechanism of glycerol fermentation and sulfate reduction. However, the specific sulfate reduction rate of GS was higher than that of SLS, while SLS showed a higher glycerol fermentation rate than that of GS. The different rates in GS and SLS were attributed to the higher relative abundances of fermentative microorganisms found in SLS and higher relative abundances of sulfate reducing bacteria (SRB) found in GS.
Ajuts:	Agencia Estatal de Investigación RTI2018-099362-B-C21
Nota:	Altres ajuts: acords transformatius de la UAB
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Glycerol fermentation ; Granular sludge ; Removal efficiency ; Slime-like substances ; Sludge flotation ; Sulfate reduction
Publicat a:	Journal of environmental sciences, Vol. 135 (January 2024) , p. 353-366, ISSN 1878-7320

DOI: 10.1016/j.jes.2022.11.011

14 p, 1.6 MB

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