Overview
The CG Mud Scraper™ series provides both peripheral-drive and centre-drive sludge collection mechanisms for circular primary, secondary, and tertiary settling tanks. These continuously operating scraper mechanisms collect settled sludge from the clarifier floor and move it towards the central sludge hopper for pump extraction, maintaining optimum clarifier performance and preventing accumulation of septic sludge. Integrated surface scum skimming arms simultaneously remove floating material to a scum trough. Available for tank diameters from 5 m to 50+ m, CG Mud Scrapers are engineered for 24/7 continuous operation under varying sludge concentrations and loading conditions.
Working Principle
The scraper mechanism consists of radial scraper blades attached to a rotating bridge structure that sweeps the clarifier floor continuously. In peripheral-drive units, the rotating bridge is supported at the centre on a fixed pivot and at the periphery on a drive wheel running on a circumferential rail track. In centre-drive units, the drive mechanism is located at the centre column with scraper arms radiating outward. Scrapers push settled sludge along the floor toward the central sludge collection hopper. Surface scum skimming arms on the same bridge collect floating material and direct it to a beach or trough on the tank wall.
Key Technical Features
- Peripheral-drive and centre-drive configurations
- Tank diameters: 5–50+ m
- Continuous sludge collection to central hopper
- Integrated surface scum skimming arm
- Heavy-duty gearbox with torque overload protection
- Variable speed drive option
- Drive speed: 10–60 min/revolution
- SS304 or hot-dip galvanised steel wetted parts
- Suitable for primary, secondary, and thickening tanks
- Peripheral rail drive for large diameter tanks (>20 m)
- Centre column drive for tanks <20 m diameter
Design Parameters
| Parameter | Value |
|---|---|
| Drive Type | Peripheral or Centre |
| Tank Diameter | 5–50+ m |
| Rotation Speed | 10–60 min/rev |
| Wetted Parts | SS304/Hot-Dip Galv. |
| Scum Removal | Integrated Skimmer |
| Overload Protection | Torque-limited/Shear Pin |
Applications
- Primary clarifiers in municipal sewage treatment plants
- Secondary settling tanks after activated sludge
- Sludge thickeners — gravity thickening of waste activated sludge
- Industrial ETP settling tanks
- Drinking water sedimentation basins
Advantages
- Continuous operation prevents sludge compaction and septicisation
- Integrated scum skimmer removes floating material simultaneously
- Torque overload protection prevents damage from debris
- Hot-dip galvanised or SS construction for long corrosion life
- Available for any circular tank diameter
- Low maintenance — annual lubrication and inspection only
Frequently Asked Questions
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