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Article Dans Une Revue Journal of Water Process Engineering Année : 2024

Solid build-up and consolidation within biofiltration of wastewater: A new multicretria analysis to early detect irreversible clogging

Accumulation et consolidation de matières solides au sein des biofiltres : comme détecter précocement la mise en place d'un colmatage irréversible

Résumé

Submerged biofiltration, using a granular medium colonised by biofilm, is indeed suitable for the treatment of urban wastewater from large cities. Unfortunately, while periodic backwashing usually controls fouling, some plants require extensive maintenance (i.e., irreversible clogging requiring declogging with soda cleaning) due to head loss development and porosity reduction that conventional backwashing cannot overcome. A new multicriteria analysis method has been proposed and tested on a full-scale plant where irreversible clogging occured twice a year. This work first cross-analyses the on-line indirect measurements recorded over 2.2 years to explain the occurrence of irreversible clogging. We have successfully shown that excessive volumetric loading rates (in suspended solids or chemical oxygen demand) have provoked irreversible clogging. Secondly, this work proposes scenarios of formation of cohesive matter, resistant to backwashing through, a succession of three states, one for the accumulation of solids within the void volume (storage due to the partial efficiency of periodic backwashing) and two states for the transformation of the accumulated solid matter with time, starting with the initiation of consolidation (reversible) and ending with its consolidation (irreversible). Finally, this work proposes a new method based on the analysis of the magnitude of the increase of the initial relative head loss with time (ΔPi / ΔPref) to gradualy describe the clogging of a biofilter: <1.3 (no solids accumulation) for unclogged biofilters, 1.3–1.6 (solids accumulation), 1.6–2 (initiation of consolidation) and > 2 (consolidation of solids). It provides recommendations on how to process the data in a hierarchical manner to detect the transition towards irreversible clogging at an early stage, and suggests corrective actions to carry out to the operator.
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hal-04652605 , version 1 (18-07-2024)

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Beatriz González Vázquez, Jean-Marc Choubert, Jean-Pierre Canler, Etienne Paul. Solid build-up and consolidation within biofiltration of wastewater: A new multicretria analysis to early detect irreversible clogging. Journal of Water Process Engineering, 2024, 65, pp.105796. ⟨10.1016/j.jwpe.2024.105796⟩. ⟨hal-04652605⟩
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