Settling-velocity-based capture of abrasive inorganic particles — grit chambers, aerated and vortex units and hydrocyclones — engineered to protect pumps, valves and downstream treatment from wear.
Engineered removal of grit, sand, silt and colloidal solids across the full particle-size spectrum.
High-rate inclined-plate settling for a large effective area in a compact footprint.
Protecting downstream plant from abrasive grit and sand.
Abrasive inorganic particles damage plant and accumulate where they are not wanted
Silica sand and grit are hard and dense, eroding impellers, seals and pipework and driving high maintenance requirement.
Grit settles in channels, digesters and aeration tanks, reducing volume and disrupting biological processes.
Grit load surges during storm flow and varies with catchment, demanding a unit that performs across the range.
Grit removal targets dense inorganic particles (ρp ≈ 2,650 kg/m³) of 150–200 µm, whose Stokes settling velocity is roughly 20–25 m/h, while retaining lighter organic solids (ρp ≈ 1,050 kg/m³) in suspension for downstream biological treatment. The unit is designed so the surface overflow rate sits between these two settling velocities — capturing grit while passing organics.
Selected by flow, headloss, footprint and grit characteristics
Velocity-controlled channels (about 0.3 m/s) settle grit while keeping organics moving; simple and robust.
A spiral roll induced by diffused air separates grit by density and scours organics, giving clean grit capture.
Forced-vortex and cyclonic units use centrifugal force for compact, high-efficiency grit removal in a small footprint.
Screw and cyclone classifiers dewater and wash captured grit for low-odour, low-organic disposal.
Robust sand-separation units protect downstream pumps and equipment on industrial and tunnelling duty.
Grit conveying and storage integrated for continuous, unattended operation.
Reynolds & Bauhm engineers sediment-removal trains from grit chambers to colloidal polishing, matched to your particle-size distribution and discharge consent.
Our expertise spans multiple industries with sector-specific water treatment solutions.