The SpiraSnail® is specifically designed to provide dedicated dewatering for the output from high-performance Hydro International grit separation / washing units such as the Grit King.® The SpiraSnail® provides effective, affordable grit dewatering that is ideal for smaller plants with peak flows of up to 10 Mgal/d (38 MLD).
Unlike conventional washing and dewatering screws that attempt to wash and dewater grit in the same process, the SpiraSnail® is only used for dewatering. Combining washing and dewatering in the same process results in turbulence that churns up fine grit and allows it to be released back into the plant. By focusing just on dewatering, SpiraSnail® screw speeds can be slower, allowing retention of fine grit while outputting a clean dry product with low organics and water content.
Its unique clarifier design, low loading rates, and slow screw speeds mean that the SpiraSnail® provides high capture efficiency while minimizing 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 optimized for use with the Grit King® grit removal system to provide high performance fine grit removal for smaller plants
Get efficient grit dewatering optimized for smaller plants
Designed specifically to address flows of up to 10 Mgal/d (38 MLD) peak, the SpiraSnail® is optimized for use at smaller plants – meaning that it is able to provide efficient, economical dewatering while maintaining the standards of performance that wastewater treatment plant operators demand.
Get operator-friendly dewatering
SpiraSnail® is designed with the operator in mind with a minimal number of wear parts and easy access for maintenance, helping to reduce maintenance time. Maximized internal clearances prevent clogging, and a unique clarifier design allows the auger trough to be rotated away from the clarifier, allowing maintenance even while the unit remains full of water.
Prevent odor
The SpiraSnail® is a fully enclosed system with easy access when you want it open and secure closures to minimize odor issues.
Minimize maintenance costs
SpiraSnail® has a shafted screw design to prevent the need for difficult to replace liners or steel wear bars, and the 4-bolt external bearing can be accessed from outside the trough, saving both time and money when it comes to inspection and maintenance.
NEW! SpiraSnail® Compact
For plants with very tight space limitations, Hydro International also offers the SpiraSnail® Compact. The system utilizes the same shafted screw design as the original SpiraSnail® but has a much smaller footprint and is also shorter than the standard SpiraSnail® system. By limiting design influent flows to ≤ 125 gpm (7.9 L/s) the SpiraSnail® Compact can achieve 95% capture of all grit 106 micron and larger. It’s smaller profile allows it to fit into plants with very tight space limitations.
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