DS-404 screw sludge dewaterer

The DS multi-disc screw dewaterer presses sludge in the channel between the screw shaft and a set of alternating moving and fixed rings. Sludge is fed from the flocculation chamber: the gap narrows along the screw, pressure rises, water escapes through the slots between the rings, and the cake is discharged at the end face. The rings shift relative to one another and clean the slots themselves, so there is no filter cloth here.

This is what sets the line apart from belt and chamber filter presses: the unit accepts diluted sludge directly from the aeration tank or clarifier, without a separate sludge thickener — it does not need to be built at the plant, the footprint required for the equipment is smaller, and phosphorus release is reduced. A spiral plate pre-thickens the sludge, and a solenoid valve increases the slurry concentration.

The line handles excess activated sludge, flotation sludge, mixed raw sludge, sludge after reagent treatment, and oily, low-concentration sludge. The screw rotates slowly, so energy and flush water consumption are low and operation is quiet. A cabinet with a programmable controller runs it: operation is automatic, without constant operator presence.

DS-404 design: sludge and activated sludge capacity (1.00% DS) ~400 kg DS/h (~40.0 m³/h), operating weight 9660 kg, power 4.95 kW, sludge and activated sludge capacity (0.20% DS) ~266 kg DS/h (~133 m³/h).

The largest unit in the line by sludge and activated sludge capacity (0.20% DS): ~266 kg DS/h (~133 m³/h) against ~200 kg DS/h (~100 m³/h) on DS-403. Sludge and activated sludge capacity (1.00% DS) ~400 kg DS/h (~40.0 m³/h) against ~300 kg DS/h (~30.0 m³/h) on DS-403. Flotation sludge capacity (2.00% DS) ~680 kg DS/h (~34.0 m³/h) against ~510 kg DS/h (~25.5 m³/h) on DS-403. Flotation sludge capacity (5.00% DS) ~1360 kg DS/h (~27.2 m³/h) against ~1020 kg DS/h (~20.4 m³/h) on DS-403.

One step down by sludge and activated sludge capacity (0.20% DS) — DS-403: mixed raw sludge capacity ~1326 kg DS/h (~44.2 m³/h) instead of ~1768 kg DS/h (~58.9 m³/h), flush water flow rate 240 l/h instead of 320 l/h, power 3.85 kW instead of 4.95 kW.