The SludgeScreen™ is an inline pressurised device that screens and dewaters sludge in one operation.  The enclosed system reduces odour problems and has no washwater requirements.

The SludgeScreen™ is a horizontal in-line coarse material separator comprising an inlet screening zone and a pressing (compacting) zone. The coarse material retained on the stainless steel inner screen surface, is transported to the stainless steel pressing zone and onward to the outlet by an archimedean screw. Compacted coarse material (screenings) are discharged by the action of a regulating cone controlled by detection of increased torque on the drive motor, into a suitable container.

The optimum pressure for sludge supply to the screen is between 1 and 1.2 bar. Whilst the unit will tolerate higher pressure for brief periods, continuous increased pressure is not desirabe

Applications

• Designed for either direct tanker, pumped feed or combination sludges

Wastewater Screening

• Ship-board preliminary treatment

Sludge Screening

• Primary
• Secondary
• Imported

Four SludgeScreen™ Units

SludgeScreen™

Advantages

• Enclosed system, reducing odour problems
• Screening, dewatering and coarse material discharge in one operation
• No washwater requirement
• Fully automatic for either continuous or intermittent screening of sludges with varying dry solids content
• Designed for either direct tanker, pumped feed or combination sludges
• Continuous coarse material separation under pressure with loss of pressure dependent on sludge thickness only
• 3mm to 10mm diameter screen perforations
• Stainless steel components
• Robust spheroidal C.I. housings at inlet and outlet ends
• Fully manufactured, assembled and tested in-house
• Fully compliant, user friendly WIMES 3.04 control panel

SludgeScreen™ Units and Control Panel

1. Flow enters through the centre of a sludge inlet (red arrow)
2. Sludge passes through the perforation and exits via the sludge outlet (blue arrow), whilst the screenings are trapped inside
3. A rotating screw moves the screenings off the inside of the drum to the pressing zone
4. In the pressing zone the screenings are pressed against a retention cone which is balanced against the drive load of the screw
5. Dewatered screenings are discharged by gravity via the screenings outlet (brown arrow)

SludgeScreen™ Process

Q. Does the SludgeScreen™ thicken sludge?

No. The SludgeScreen™ removes gross solids from a sludge stream.

Q. What is the headloss through the SludgeScreen™?

This is a very complex issue, as the headloss depend on many factors, include sludge type, thickness, screenings content and type, as well as how well adjusted the machine is. Typically a headloss of 2 to 5 m should be expected.

Q. Can the discharged sludge be under pressure?

Yes, the unit is capable of working under pressure and therefore the discharge can be higher than the outlet of the unit. We would normal suggest limiting this to around 5 m of static lift.

Q. . What flow rate can the unit handle?

The flow rate depends on a number of factors, but typically the unit will take 50 to 120 m³/h sludge at 6 to 1% dry solids.

Q. What quantity of screenings will I get?

The amount of screenings generated depends on the amounts that enter the machine, which is strongly dependent on where the sludge comes from. Activated sludge tends to contain few screenings, whereas imported sludge tend to contain high volumes. Generally the machine will handle up to 1m³ of screening per hour.

Q. How often should the SludgeScreen™ be serviced?

The service interval depends on the usage. Generally we advise that the screen should be adjusted on a monthly basis, with a more detailed examination quarterly.