direct thickening screen on biological sludge of different concentration – Drainis ^® GD

Drainis^® GD (Grit Drainage) gravitates the flocculated polymer sludge through a screen (grid). Elastomeric scrapers push the sludge to the end of the screen. Its washing is automatic.

The Drainis^® GD is available in 2 versions depending on the type of sludge and its concentration:

• Drainis^® GD-D (Divergent mesh) has a drainage screen with a progressive mesh size that optimizes Dynamic Sludge Thickening. The spacing between the bars allows the thickening of dilute sludge from 2 g/l to 8 g/l. On an extended aeration plant type, the output dryness is between 4 and 6% with sludge directly taken from the aeration tank.
• Drainis^® GD-E (Equal mesh) has a drainage screen with a continue mesh size. The spacing between the bars allows the thickening of dilute sludge > 8 g/l. It is declined in two models corresponding to different sludge concentration. The output dryness will be between 5 and 10% depending on the input concentration.

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key figures

• More than 300 references worldwide
• Reduction by 25% of power use per m³ sludge/h (vs a Gravity Belt Thickener)
• 100% automated system: limited monitoring and labor

among our references

• Les Mureaux (France) 120 500 PE (Drainis® GD-D)
• Sophia Antipolis (France) 50 000 PE (Drainis® GD-E)
• Nice Haliotis 2 (France) 680 000 PE (Drainis® GD-E)