Product Information
When handling complex sludge with high moisture content or poor separability, traditional equipment often struggles with large footprints and clogging. This unit uses a fully enclosed centrifugal structure, completely eliminating consumable filter cloths and relying on powerful centrifugal force for continuous solid-liquid separation. For modern plants pursuing high-speed centrifugal sludge dewatering, it not only eliminates the tedious task of cleaning filter meshes but also produces consistently dry cake within a very small footprint while keeping the site odor-free.
Get a QuoteDecanter Centrifuge|High-Speed Centrifugal Sludge Dewatering Machine|Industrial Sludge Centrifuge
Working Principle
Sludge mixed with flocculant is pumped into the high-speed rotating bowl through the central feed pipe. Under thousands of Gs of centrifugal force, heavy solids rapidly settle against the bowl wall, while the clarified liquid stays in the inner layer. Meanwhile, the internal scroll conveyor rotates at a slight differential speed, pushing the dry sludge toward the conical end for discharge. The clear liquid overflows from the other end, completing the solid-liquid separation.
Application Fields
1.Municipal wastewater plants: replacing traditional settling tanks to treat biological excess sludge.
2.Petrochemical refineries: enclosed separation of oily sludge to prevent volatile gas leaks.
3.Papermaking and printing/dyeing: recovering fine fibers from wastewater for dry transport.
4.River dredging projects: rapidly processing high-moisture slurry for easier loading.
FAQ
Q1: What is the typical moisture content of the cake discharged from a decanter centrifuge?
A: It depends on the sludge type. For municipal biological sludge, moisture is usually reduced to 75%–78%. For industrial sludge like papermaking or printing/dyeing, it can drop to around 70% with proper chemical dosing. Compared to belt presses, the cake dryness is more consistent and less prone to re-wetting.
Q2: If the feed suddenly becomes very dilute, how does the machine prevent "sludge washout" (cloudy effluent)?
A: This relies on differential speed control. Modern units use VFDs. When the feed gets dilute, the system automatically reduces the differential speed between the bowl and scroll, keeping the sludge inside longer to ensure a clear effluent. Operators can also fine-tune it manually on the control panel.
Q3: I've heard chemical dosing is critical for centrifuges. Does adding more polymer make the cake drier?
A: No. There's an optimal balance point for dosing. Too little, and the sludge won't flocculate completely, leading to poor separation. Too much, and not only do you waste chemicals, but the sludge becomes slippery like "jelly," which actually hinders centrifugal separation. The best dosage ratio is usually determined through on-site jar tests.