Get efficient, economical grit dewatering at smaller plants with no washwater requirements.

The SpiraSnail® is a highly efficient screw-type grit dewatering system that delivers 95% removal of all particles 106 µm and larger and 75% of 75-106 µm particles to cut solids handling and disposal costs.

Designed to work in combination with a Hydro International grit washing unit such as a GritCup®, the SpiraSnail® provides effective, affordable grit dewatering ideal for smaller plants.

Its unique clarifier design, low loading rates, and slow screw speeds mean that the SpiraSnail® provides high capture efficiency while minimising re-suspension of captured materials, and its low number of wear parts, easy access for maintenance and washwater-free operation keeps operating and maintenance costs to a minimum.

Applications

  • Grit dewatering at smaller wastewater treatment plants

  • Treatment plant retrofits

Only SpiraSnail® is optimised for use with the GritCup® grit washing system.

Performance

  • 95% removal of grit 106 micron and larger

  • 75% removal of grit 75-106 micron

  • >60% Total Solids in output grit at design flow

  • <20% Volatile Solids in output grit at design flow

Conveying capacity 

  • 0.75 yd3 / hour (0.57 m3/hr)

Design notes 

  • Variable frequency drive in the control panel provides flexibility, allowing screw speed adjustment to match changing local operating conditions

  • Optional explosion proof motor allows the system to operate in classified environments

  • Standard 304 stainless steel construction (316 SS optional) 

  • Standard odor cover 

  • Optional NEMA 7/4X controls