Learn the science behind settling velocities

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Learn the science behind settling velocities in a grit removal system for wastewater treatment in this quick two minute industry update.

Settling velocity is pretty simple, it measures the distance over time a particle will take to settle in water. Let’s take a quick look at this video comparing clean sand versus wastewater grit particle settling rates. As you can see from this video, both clean sand and wastewater grit settle at the same rate and organic “coatings” do not affect grit settling velocity. Now let’s take a quick look at how grit travels in a system when hydraulics are used rather than settling. This underwater footage was taken on a go pro in a 4 million gallon per day test tank for a forced vortex grit removal system with v-force baffle. As you can see, when hydraulics are used in a grit removal system, settling is no longer a factor. Notice how the grit travels as a moving bed across the floor and into the grit hopper. There is no settling action here. Hydraulic forces push the grit particles to the center for entrapment. To quickly recap: Settling velocity is distance over time a particle takes to settle Clean sand and wastewater grit have the same settling rate Hydraulics override settling velocities when applying a flat floor vortex tank design Hydraulics move grit to the desired location

 

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For more than 65 years, Smith & Loveless has delivered engineering ingenuity and quality craftsmanship to the water industry by pioneering superior pre-engineered pumping, treatment and headworks systems. Our factory-built concepts pave the way for thousands of municipalities, developments and industry to reap the benefits of complete, single-source solutions and peerless system designs arranged to facilitate the ease of operation and maintenance and maximize the value of investment by way of long-lasting, durable equipment. Beneficial life cycle costing is the hallmark of the Smith & Loveless way of design. Smith & Loveless maintains market leadership in lift station design and manufacture, grit removal systems for municipal headworks and industrial process streams, and a complete range of wastewater treatment systems, including MBRs, fixed-film and extended aeration plant (both package and field-erected systems). With tens of thousands of installations in more than 70 nations on all seven continents, Smith & Loveless truly is Above All Others™.

Learn the science behind settling velocities

http://gritthefacts.com/grit_definition_profiles.php

 

https://www.youtube.com/watch?v=6o8YFqxwr3Q&feature=youtu.be