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Vacuum System Handles Fine Alum Sludge - Town of Tewksbury, MA

From Alar Engineering Corp.
 

 

The Tewksbury Water Treatment Plant in northern Massachusetts is using a vacuum filtration/dewatering system to dewater up to 8,000 gpd of settled residuals produced during the clarification of 3mgd of Merrimac River water with alum.

The residuals consist of low concentration (0.5 to 1.0 percent concentrate) of alum and sediment from the river water. During summer operation, the residual also contains potable activated carbon (PAC) that is added to improve the taste and odor of the treated water.

Prior to installation of the new dewatering system the alum based residual was pumped to an adjacent city's wastewater treatment plant. On top of a base disposal fee, Tewksbury also paid surcharges in excess of $1,000 per day due to the suspended solids content of the discharged residuals.

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