Thermal treatment of sewage sludge: Impact of the sludge type and origin on the formation of recalcitrant compounds.

Autor: Faixo S; SUEZ, Centre International de Recherche Sur l'Eau et l'Environnement (CIRSEE), 38 rue du Président Wilson, 78230 Le Pecq, France; TBI, Université de Toulouse, CNRS, INRAE, INSA, Toulouse, France - 135 avenue de Rangueil, 31077 Toulouse CEDEX 04, France. Electronic address: faixo@insa-toulouse.fr., Garrigues JC; Laboratoire SOFTMAT (IMRCP), Université de Toulouse, CNRS UMR 5623, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse CEDEX 9, France., Haddad M; SUEZ Engineering & Construction, SUEZ International, Tour CB21 - 16 place de l'Iris, 92040 Paris La Défense, France., Mazeghrane S; SUEZ, Centre International de Recherche Sur l'Eau et l'Environnement (CIRSEE), 38 rue du Président Wilson, 78230 Le Pecq, France., Gaval G; SUEZ, Centre International de Recherche Sur l'Eau et l'Environnement (CIRSEE), 38 rue du Président Wilson, 78230 Le Pecq, France., Benoit-Marquié F; Laboratoire SOFTMAT (IMRCP), Université de Toulouse, CNRS UMR 5623, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse CEDEX 9, France., Paul E; TBI, Université de Toulouse, CNRS, INRAE, INSA, Toulouse, France - 135 avenue de Rangueil, 31077 Toulouse CEDEX 04, France.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2024 Nov 28; Vol. 271, pp. 122868. Date of Electronic Publication: 2024 Nov 28.
DOI: 10.1016/j.watres.2024.122868
Abstrakt: In a municipal wastewater treatment plant, the thermal treatment of sludge can be an efficient way of increasing the final sludge cake dryness and boosting anaerobic digestion performances. However, such treatments generate refractory compounds which, once returned to headworks, can affect the quality compliance of effluent discharges, particularly concerning organic nitrogen. This study explores the effects of thermal hydrolysis (TH) and hydrothermal carbonization (HTC) of municipal sludge on the refractory organic compound production. A novel approach using ultra-performance liquid chromatography with size-exclusion chromatography and UV/fluorescence detection (UPLC-SEC-UV/Fluo) was employed to characterise recalcitrant dissolved organic matter (rDOM), which typically consists of Maillard reaction products (MRP). Specifically, UPLC-SEC-UV/Fluo was combined with principal component analysis (PCA) to enable a more thorough examination of the chemical diversity of MRPs produced. Greater temperatures during the thermal treatment step lead to increased production of rDOM and rDON. Protein-rich sludge with a great AS:PS ratio yields the greatest rDOM levels. MRP characteristics, such as molecular weight distribution and aromaticity, are primarily influenced by temperature and plant origin. UPLC-SEC-UV/Fluo provides information on the structures of MRPs useful to optimize the thermal treatment process and in understanding their fate in subsequent processes (chemical oxidation, biodegradation). These insights have practical implications for sludge treatment processes, including optimizing TH and HTC conditions to control rDOM production and adapt the sludge treatment line of a water resource recovery facility.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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