Influence of sample pretreatment and weather conditions on grit characteristics

Plana, Queralt; Carpentier, Jessy; Tardif, François J.; Pauléat, Aurélien; Gadbois, Alain; Lessard, Paul; Vanrolleghem, Peter

doi:10.2175/193864717822153012

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“…One should therefore be careful when drawing general conclusions. The effect of the dry, wet, and snowmelt conditions was already observed on the particle size distribution in a previous study (Plana et al, ).…”

Section: Resultssupporting

confidence: 59%

Characterizing the settleability of grit particles

Plana

Pauléat²,

Gadbois³

et al. 2019

Water Environment Research

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Grit chambers are installed at the headworks of a water resource recovery facility (WRRF) to reduce the impact of grit particles to the equipment and processes downstream. This settling process should thus be designed and operated in an efficient way. Despite the importance of knowing settling characteristics for design and operation of grit chambers, previous grit definitions have been based only on particle size characteristics, and not on settling velocities. Thus, this study presents an evaluation of the performance of two promising settling velocity characterization methods, ViCAs and elutriation, to characterize wastewater particles in view of the design and the optimization of the efficiency of the grit removal unit. © 2019 Water Environment Federation • Practitioner points• Settling characteristics are the governing parameter for grit chamber design. Since grit particles are vastly heterogeneous, it is preferred to measure these characteristics directly rather than to estimate them from particle size (and assumptions of density, form factor, …). • More detailed settling information about grit particles can improve grit chamber design and estimation of removal performance. • Adapted ViCAs and elutriation methods for faster settling particles allow studying the particle settling characteristics in a grit chamber. These methods are simple, fast, and cheap and only require small wastewater samples. • A relationship was found between the influent TSS concentration and the location of the PSVD curve, with higher TSS concentrations corresponding to higher settling velocities. • It was demonstrated that the dynamics of the wastewater characteristics under dry, wet, and snowmelt weather conditions influence grit settling characteristics.

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Section: Resultssupporting

confidence: 59%