- Total system responsibility
- Highly efficient removal of grit particles at variable flow rates
- Standard grit trap chambers handle flows up to 70 MGD (3,000 L/s)
- Low energy costs
- Low headloss (less than 6.5mm)
- Low maintenance
- Durable and rugged all-stainless steel construction standard
- Carbon steel optional
Sand Sharks are known for their unique hunting strategy and tendency to swim along the ocean floor near the shoreline in the surf zone. Our Sand Shark Grit Trap and Sand Shark Grit Classifier also feel at home in sandy, gritty environments and are skilled predators with their highly efficient and economical ability to remove grit particles in a variety of flow rates.
Sand Shark Family of Equipment
Grit Classifier & Hydro-Cyclone
Sand Shark Grit Trap
The Sand Shark Grit Trap is a simple, efficient and economical solution to your grit removal needs. In-ground and above-grade models are available for effective, efficient and economical removal of grit from flows up to 70 MGD (3,000 L/s) per unit. Our vortex grit removal system includes a geared drive head and rotating flat plate impeller inside the grit collector. Grit pump or air lift options extract collected grit to the Hydro-Cyclone and classifier.
- Vortex-style system allows continuous operation under variable flows
- 270° and 360° grit trap designs
- Sized to trap 200 micron grit
- Compact, circular concrete or stainless steel chamber suitable for tangential entry channel and parallel exit channel
- Rotating impeller maximizes grit capture in the storage hopper
- Ejects light organic solids from the chamber
- In-line design available
Theory of Operation: Grit Trap
The grit trap will generally be installed immediately downstream of the fine screen. Inflow enters the circular chamber carrying the heavy grit particles, which will be drawn towards the side wall and flow around the edge of the chamber. Gravity settles the grit particles as they travel this path.
The impeller creates an up-draft that pushes the grit toward the periphery of the chamber. Light organic and inorganic solids are lifted to the surface and ejected with the remainder of flow from the grit trap.
The calm condition around the edge of the chamber allows the grit particles to sink and be guided by the sloped floor to the center of the chamber. Solids will fall underneath the rotating impeller and collect in the bottom of the chamber for storage and removal.
Sand Shark Grit Classifier & Hydro-Cyclone
Sand Shark Grit Classifier Features
- Shafted screw flight elevates, dewaters and disposes of grit
- Dry grit deposited directly into the dumpster
- Flared inlet hopper with internal overflow weir sized to trap and process 100 micron grit particles
- Lower bearing fully protected against the ingress of abrasive grit particles
- No moving parts
- Replaceable wear liner
- Specifically designed for de-gritting wastewater
- Mounted directly over Sand Shark Grit Classifier inlet hopper
Theory of Operation: Grit Classifier & Hydro-Cyclone
Grit slurry is pumped from the storage hopper at flow rates of 200-250 GPM (12.6-15.8 L/s) directly into the Hydro-Cyclone mounted on top of the Grit Classifier. Excess water exits via the 6-inch overflow and returns to the main flow, generally upstream of the grit trap. The underflow, containing less than 50 GPM (3.2 L/s), and heavy grit solids will be located by the vortex finder and dropped via the outlet cone into the Grit Classifier hopper.
Settled grit will be elevated by a shafted screw that is supported between a top and bottom bearing leaving a 0.5 inch (12.7mm) clearance between the screw flights and the Grit Classifier trough, creating a protective layer of grit. The lower bearing is fully enclosed to prevent the ingress of grit and premature wear of the assembly. The screw lifts the grit from the bottom of the hopper. During conveyance, free water drains back to the hopper while dry grit is elevated and deposited in a receptacle for disposal.
Hydro-Dyne offers a variety of pumping solutions to suit the configuration of the application. The self-primed centrifugal pump is generally used when the grit chamber is cast in-ground. Significant construction cost savings can be realized by mounting the pump at grade. When the grit chamber is elevated it is common to install the suction pipe through the storage hopper wall and install the grit pump in a dry well for ease of maintenance and accessibility. An air lift pump is an efficient method of moving grit from the storage hopper directly to the inlet of the Grit Classifier, without the need for the Hydro-Cyclone.
Grit Pump Options
- Top mount, flooded suction and air lift options
- Centrifugal pump installed in a dry pit adjacent to the grit chamber
- Self-primed centrifugal pump installed at the top of the grit chamber above normal water level
- Air lift pump centrally mounted on the drive tube
Drawing on our 40+ years of experience and more than 2,000 unique installations worldwide, your equipment will be specifically engineered to best fit the needs of your application.