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True Grit. A Grit Removal Efficiency Investigation at Five Wastewater Treatment Plants

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The Hampton Roads Sanitation District (HRSD) owns and operates thirteen wastewater treatment plants (WWTP) in Southeastern Virginia. Several HRSD WWTPs experience abrasive wear to equipment, reduced operating volume in aeration tanks and digesters, premature equipment repairs and increased maintenance cost due to poor grit removal.

In 2007 and 2008 HRSD embarked upon a grit removal study at five of the WWTPs. The objective of the study was to evaluate the grit removal efficiencies of these plants. The study compared three medium energy forced vortex grit units, a gravity settling detritor, and an aerated grit system. All five plants use hydro cyclones and classifiers. The study concluded the detritor had the highest grit removal efficiency and the angle of the hydro-cyclone is a contributing factor in grit removal efficiency. The study also recommended several equipment and operational strategies to improve grit removal at the other facilities.
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Keywords: Grit efficiency; aerated grit; detritor; grit sampling; vortex

Document Type: Research Article

Publication date: 01 January 2009

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