Sand Shark
Grit Removal Systems

Efficient and economical solutions to
your grit removal needs.

Efficient and economical solutions to your grit removal needs.

Overview

Hydro-Dyne has a long history of supplying grit removal systems to the municipal wastewater industry. A wide range of products are available to suit grit removal needs. Hydro-Dyne excels at integrating screening and grit together for a comprehensive preliminary treatment system.

 

Sand Sharks are known for their unique hunting strategy and tendency to swim near the shoreline in the surf zone. Our Sand Shark line of grit equipment also feel at home in sandy environments and are skilled predators with their highly efficient ability to remove grit particles in a variety of wastewater flow rates.

Sand Shark Family of Equipment

Sand Shark Circular Stacked Tray (CST)
Sand Shark Stirred Vortex Grit Removal
Sand Shark Grit Classifier
Sand Shark Grit Washer
Sand Shark Grit Pump

Fine Grit Removal

Sand Shark Circular Stacked Tray (CST)

The Sand Shark Circular Stacked Tray (CST) delivers advanced fine grit capture and removal for municipal and industrial treatment plants of all sizes. Engineered for high efficiency and low maintenance, the CST system removes very fine grit, reduces organic content, and integrates seamlessly into new or existing headworks designs.

Grit Removal Capacity
95% of 75 micron particles (2.65 g/cc) at avg flow

Sizes
6’, 9’ and 12’ in diameter trays
Peak Daily Flow Capacity
To 20 MGD (876 L/s)
Peak Instantaneous Capacity
To 20 MGD (876 L/s)
Materials
304/316 stainless steel in concrete or stainless tank
Configurations
270 or 360 degree Inlet/Outlet

Features & Benefits

Technology & Materials

  • Stainless steel supporting structure for long life, integrity, and corrosion resistance
  • Integrated PE lamella trays for high-performance settling
  • Optimized inlet plenum for even flow distribution
  • SLOW Outlet Design – Singular Low-velocity Outlet Weir
  • Seamless integration with screening, grit dewatering, and grit washing equipment

Operation

  • No moving parts, no electrical requirements
  • Minimal operator attention required
  • Low O&M and long lifecycle for reduced total cost of ownership

Installation

  • Designed for installation in square concrete vaults
  • Fabricated in sections for simplified handling and placement
  • Drop-in installation for faster, easier setup
  • Available with manufactured base as an option to eliminate grout installation in vault

Performance

  • Removes 95% of particles ≥75 microns at design flow rates (specific gravity 2.65)
  • Low headloss – typically less than 12” at peak flow
  • Handles small, medium, and large treatment plants with consistent efficiency

Coarse Grit Removal

Sand Shark Stirred Vortex Grit Removal

Coarse Grit Capture

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 (3,066 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.

Single Source Supplier for Total System Responsibility

  • Highly efficient removal of grit particles at variable flow rates
  • Low energy and maintenance costs
  • Low headloss (less than 0.25”)
  • Durable and rugged all-stainless steel construction standard
  • Vortex-style system allows continuous operation under variable flows
  • Screening and grit headworks package available
  • Optional Coanda ramp inlet minimizes grit short circuiting

Sand Shark Stirred Vortex Propeller (SVP)

Grit Removal Capacity
95% of 200 micron particles (2.65 g/cc) at avg flow
Sizes
To 24’ diameter concrete settling basin
Peak Daily Flow Capacity
To 70 MGD (3,066 L/s)
Peak Instantaneous Capacity
To 70 MGD (3,066 L/s)
Materials
304/316 stainless steel in concrete or stainless tank
Configurations
270 or 360 degree Inlet/Outlet / Flat Floor Design

Rotating grit stirring mechanism maximizes grit capture in the storage hopper

Sand Shark Stirred Vortex Impeller (SVI)

Grit Removal Capacity
95% of 300 micron particles (2.65 g/cc) at avg flow
Sizes
To 24’ diameter concrete settling basin
Peak Daily Flow Capacity
To 70 MGD (3,066 L/s)
Peak Instantaneous Capacity
To 70 MGD (3,066 L/s)
Materials
304/316 stainless steel in concrete or stainless tank
Configurations
270 or 360 degree Inlet/Outlet / Flat Floor Design

Rotating impeller maximizes grit capture in the storage hopper

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.

Grit Dewatering

Sand Shark Hydro-Cyclone

  • Mounted directly over Sand Shark Grit Classifier
    inlet hopper
  • No moving parts
  • Replacement wear liner


Benefits

  • Compact & Flexible – Small footprint, retrofit capable, and customizable to site conditions.
  • High Capture Efficiency – Lamella trays and centrifugal force handle peak grit events; rated for 75-micron particle capture.
  • Cleaner Output – Optional grit washer reduces organics for improved odor control.
  • Proven Reliability – Established grit removal and dewatering technology.

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.

Grit Washing and Dewatering

Sand Shark Grit Washer (GW)

Grit Removal Capacity
95% of 75 micron particles (2.65 g/cc) at avg flow
Sizes
250 gpm capacity
Materials
304 or 316 Stainless Steel
Organic Removal
Up to 95% removal
Operation
Intermittent in most cases
Dewatering Capacity
To 60% solids by wt.

Grit Pump

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
sandshark-grid-to-frame

Thank you for your
interest in our company.

Do you have any questions or would you like more information?
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