Inspired by extensive expert CFD modeling and developed rigorously in actual field conditions, the patent-pending PISTA® INVORSOR® vortex grit removal system combines the power of proven particle capture methods: enhanced settling by inclined plates meeting a defined surface overflow rate [SOR] with the established hydraulic forced vortex grit removal process to achieve industry-best, ULTRA-FINE grit removal efficiency down to 75-micron particle size across all flows with no derating.
Compared to other fine particle grit removal systems, the INVORSOR® delivers lower capital and operational costs, larger capacity in individual units, greater design flexibility for inlet-outlet design options, and a higher surface area-to-volume ratio to generate consistent fine grit capture during low flow, daily flow and peak flow conditions — up to 50 MGD in single units [190,000 m3/d].
How It Works
The flow enters the INVORSOR® tangentially into the flat floor vortex zone. Here multiple forces, including centrifugal, radial and buoyancy forces, cause large, medium and fine grit particles moving along the chamber floor to separate from the flow stream into the lower grit storage hopper. The flow continues to the inclined cones in the upper chamber. There, the surface area provided by the inclined cones induces ULTRA-FINE particle removal. Intermittently, the PISTA® Grit Pump pumps collected grit particles to grit washing and dewatering components. The flow, with grit removed, exits through the outlet, which can be placed at nearly any direction during the design phase.
| Unit Capacity | Up to 50 MGD (190,000 cmd) |
| Arrangement | Variable inlet / outlet up to 360° |
| Removal Efficiency | 95% down to 75 Micron Particles |
