Patent ID: 6379547
Filing Date: 2002-04-30
Classification: E03F

Abstract:
Method for separating sludge from water in a mobile dewatering unit that is operable for sucking water and sludge from a sewage well, separating sludge from water, and returning the water to the sewage well, the method comprising the following process steps:providing a water driven ejector for lifting water and sludge from the sewage well to be mechanically separated in the mobile dewatering unit; providing at least one screening cylinder having a perforated cylinder wall with perforations having a hole diameter of about 0.8 mm to about 2.0 mm; feeding the water and sludge for mechanical separation in the screening cylinder by forcing the sludge axially through the cylinder with a helical cam; collecting and recycling separated sewage water under pressure to drive the ejector until substantially the total volume of water and sludge is lifted from the well and contained in the dewatering unit for mechanical separation; and returning the water, containing particles have a maximum particle size of about 0.8 mm to about 2.0 mm to refill the sewage well, through said ejector.