DS-351 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-351 design: sludge and activated sludge capacity (1.00% DS) ~60 kg DS/h (~6.0 m³/h), operating weight 1900 kg, power 1.3 kW, sludge and activated sludge capacity (0.20% DS) ~40 kg DS/h (~20.0 m³/h).

By width it sits between DS-202 (1050 mm) and DS-401 (1110 mm): 1100 mm. Sludge and activated sludge capacity (0.20% DS) ~40 kg DS/h (~20.0 m³/h) — the same as on DS-302. Sludge and activated sludge capacity (1.00% DS) ~60 kg DS/h (~6.0 m³/h) — the same as on DS-302. Flotation sludge capacity (2.00% DS) ~100 kg DS/h (~5.0 m³/h) — the same as on DS-302.

One step down by width — DS-202: mixed raw sludge capacity ~104 kg DS/h (~3.47 m³/h) instead of ~260 kg DS/h (~8.67 m³/h), flush water flow rate 64 l/h instead of 72 l/h, power 1.65 kW instead of 1.3 kW. One step up — DS-401: mixed raw sludge capacity ~442 kg DS/h (~16.0 m³/h) instead of ~260 kg DS/h (~8.67 m³/h), flush water flow rate 80 l/h instead of 72 l/h, power 1.65 kW instead of 1.3 kW.