Most sludge needs chemical conditioning rather than pre-treatment. Anionic or cationic polymer is selected from sludge zeta potential and dosed at 3–8 kg active polymer per tonne of dry solids, mixed inline with 30–60 seconds of ageing before the drum. Coarse screening at 5–10 mm removes rags and debris. Digested biosolids and some high-fibre food wastes run without polymer. Our engineers confirm the dose with a jar test or a pilot trial on your sample.

Yes. The PLC holds start-up, normal run, cleaning and shutdown sequences, stores a recipe per sludge type, and adjusts screw speed from torque feedback. Filtrate turbidity signals a dosing problem, vibration sensors flag imbalance, and alarms go out over Modbus RTU/TCP, Profinet or OPC-UA. In practice an operator checks the panel once or twice per shift and does weekly lubrication and nozzle checks.

Weekly: visual check, spray nozzles, bearing grease, polymer stock and a filtrate TSS sample. Quarterly: belt tension, coupling alignment, gearbox oil, electrical terminations. Annually: measure ring clearances, inspect the cage, and replace bearings on hours (typically 8,000–15,000). The wearing parts are the rings, the bearings and the seals — there is no filter cloth in the machine.

Mechanical life runs 15–20 years with the maintenance schedule above. A major overhaul at 8–10 years covers bearings and screen refurbishment. Economic life before an upgrade is typically 10–15 years, depending on how much the sludge character has changed.

Equipment warranty is 18 months from commissioning or 24 months from shipment, whichever comes first, covering defects in materials and workmanship with free replacement parts. Remote technical support runs in English, Spanish and Chinese; spare parts ship from stock and field technicians are available for commissioning and training. Full terms are in the quotation.

Operation and maintenance manual with troubleshooting and parts lists, electrical single-line and panel drawings, mechanical assembly and foundation drawings, material test reports and welding procedure specifications, the FAT protocol and results, and a recommended spare parts list. Manuals are supplied in English, with other languages on request.

Three numbers start the selection: flow in m³/h, feed concentration in mg/L or % DS, and the operating hours per day. From those we get the dry solids load in kg/h and read the model table across your concentration column, then check cake dryness against your disposal route. Where the sludge is unusual — oily, fibrous, or high in grit — we size from a test run rather than from the table. Send the three numbers and we will come back with a model, a footprint and a power figure.