Dewatering System Filters Suspended Solids in One Pass

Originally titled 'Alar Dewatering System Filters Suspended Solids in One Pass'

At Sur/Fin 2018, Alar Engineering will demonstrate its Auto-Vac, a dewatering system that, when paired with chemical treatment, can filter heavy metals (suspended solids) and trace amounts of oil in one pass.

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Alar Engineering will demonstrate its Auto-Vac, a dewatering system that, when paired with chemical treatment, can filter heavy metals (suspended solids) and trace amounts of oil in one pass. Chemical pretreatment is typically driven by pH/oxidation-reduction potential, with little to no flocculants or coagulants needed, the company says.

With 16 filter sizes, the system is designed to handle continuous flows of rinse water without a clarifier or sludge thickener. Treated wastewater is vacuumed through a 1-micron filter media that traps the solids and cleans the water. When the solids saturate the filter surface, a stepping motor activates a knife blade that shaves off the blinding solids, leaving a clean layer of filter media underneath. This self-cleaning feature is said to prevent bottlenecks associated with plate and frame filter presses, such as plugging and blinding, sludge settling time, blow-down time, plate scraping, filter cloth blowouts, and maintenance.

According to the company, this system’s “absolute” filtration over the “nominal” filtration of a clarifier and press combination eliminates the need for polishing sand filters and re-processing the filter press effluent.

As part of the technical program at Sur/Fin, Alar’s Mike Stangel will present a case study on applied wastewater equipment solutions.