How Does MAK Water’s Compact Grit Removal System Work?
The Compact Grit Removal System is a primary treatment machine designed to provide grit removal pre-treatment in a single packaged unit process. Influent passes through a longitudinal sedimentation tank, where heavy particles (sand and grit) settle to the bottom. Sand and grit are removed from the sedimentation tank via a system of screws.
A horizontal shaftless grit conveying screw transports settled grit to the sump. The shaftless design eliminates submerged bearings and a central shaft, allowing larger grit particles to move through freely without jamming. The screw runs in a high molecular weight polyethylene (HMPE) liner at low rotation speed, reducing maintenance requirements compared to shafted equivalents. Grit is then removed from the sump via a shafted extraction screw which lifts the grit from the tank for discharge into a bin.
A blower can be installed as an option in the sedimentation tank to assist with fluidising the settled sand and grit, for easier removal by the extraction screw. This compact system can also be configured to remove fats, oils and grease as an added option.
ICR Performance Features
Grit removal efficiency: Up to 90% for particles >200 µm
Design basis: Influent TSS 500 mg/L with up to 0.5% grit content
Flow rate range: 10 to 150 L/s across 9 standard models (ICRs 3 to ICRs 42)
Installed power: K1 motor 0.55–0.75 kW / K2 motor 0.75–1.1 kW / K3 motor 0.37–0.55 kW - low energy draw for the throughput
Footprint: Smallest model 4.0m (L) × 1.27m (W) / largest 16.0m (L) × 2.06m (W)
Optional FOG removal configuration: Available for food and beverage applications
Optional blower: Ideal for grit fluidisation and classification
Applications
Real-world examples
Grit Removal for Truck Wash
A large truck washing company was having problems with sludge accumulation in its source water pits that it was using for vehicle wash-down. This sludge accumulation was so high that it was reducing its water storage capacity and thus impacting on operations. MAK Water was asked to review the operation and recommend a long-term solution that reduced its ongoing costs whilst resolving its current water storage issues.
Bunbury, Western Australia
Screening & Grit Handling
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