Product Information
In machine shops, petrochemical plants, or refineries, oily sludge is slick and sticky. Traditional belt filter presses choke on it because the sludge clogs the filter cloth—and washing it off is a nightmare. To handle this mess, the core equipment must have serious self-cleaning power. An Oil Sludge Dewatering machine uses a unique stack of fixed and moving rings. As the spiral shaft rotates, the gaps between the rings constantly scrape and clear themselves, completely preventing clogging and pressing the sticky oil sludge into dry cake.
Get a QuoteOil Sludge Dewatering Machine | Screw Press Dewaterer | Industrial Sludge Dewaterer
Working Principle
There's no traditional filter cloth inside. Instead, it's built from countless fixed and moving rings stacked together. As the spiral shaft turns slowly, the moving rings are pushed up and drop down, acting like tiny blades to scrape away oil stuck in the gaps. During the Oil Sludge Dewatering process, the sludge is pushed forward by the spiral shaft, the chamber narrows, forcing water out through the ring gaps while dry cake discharges from the end—achieving continuous, almost maintenance-free operation.
Application Fields
1.Machine shops: dewatering cutting fluid sludge without clogging.
2.Petrochemical: processing grease trap sludge to recover oil.
3.Steel cold-rolling: pressing iron powder sludge dry for hauling.
4.Waste oil recycling: reducing refined sludge volume to cut disposal costs.
FAQ
Q1: When treating oily sludge, what's the typical moisture content of the discharged cake?
A: It depends on the sludge properties and chemical dosage, but you're generally looking at around 75%–80%. Oily sludge is much tougher to dewater than standard municipal sludge because it's so viscous. Plants usually dose PAC and PAM for demulsification and flocculation to boost the squeezing effect.
Q2: With the fixed and moving rings rubbing against each other, won't they wear out fast?
A: The rings are usually made of 304 or 316L stainless steel, or sometimes special coatings. As long as there's no hard grit in the feed and the rotation speed is right, wear is very slow. The real danger is large hard objects (like metal scraps) sneaking in, which is why it's highly recommended to install a fine screen or grinder before the feed pump.
Q3: Since there's no filter cloth, do you still need to wash it with water?
A: During normal operation, you don't need continuous high-pressure washing, which saves a lot of water costs. But to keep grease from hardening in the gaps over time, it's smart to pump some clean water through and let it run idle for a few minutes before shutting down—it's an easy maintenance habit that pays off.