Robust Externally Fed Rotary Drum Screen Machine for Heavy-Duty Applications

Externally Fed Rotary Screen Drum screen Description

This stainless steel wedge wire screen is self-cleaning by nature due to constant back washing.  This often allows for only intermittent use of the spray bar cleaning system, reducing water usage. Not well suited for fine screening of high flows, but the use of the doctor blade system makes this mechanical screen well suited when oils and grease are present. Sized based on peak flow, solids and fats, oils, grease loadings in the wastewater/process water, these units can be configured with a variety of piping scenarios, overall dimensions and slot openings. Bypass configurations allow for bypass of overflow when upset conditions occur.

Externally Fed Rotary Screen Drum screen Function

Separation of Solids from Liquid: The primary function of externally fed rotary drum screens is to separate solid particles from a liquid stream. This is particularly important in wastewater treatment plants where the goal is to remove solid contaminants from sewage or industrial wastewater before it can be discharged or further treated.

Screening and Filtration: As the liquid flows into the drum screen, the solid particles and debris are captured on the surface of the rotating drum due to the perforations or slots. The size of these openings can be customized based on the specific requirements of the application. Larger openings allow larger particles to pass through, while smaller openings capture finer solids.

Continuous Operation: One of the advantages of externally fed rotary drum screens is that they can operate continuously. The rotation of the drum ensures a continuous screening process, making them suitable for applications where a constant flow of liquid needs to be processed.

Self-Cleaning Mechanism: To prevent clogging and maintain efficient operation, many rotary drum screens are equipped with a self-cleaning mechanism. This mechanism typically involves brushes or spray nozzles that clean the drum’s surface as it rotates, dislodging and removing accumulated solids.

Efficient Solids Removal: Rotary drum screens are known for their efficiency in removing solids from liquid streams. They are often used as a preliminary treatment step in wastewater treatment plants to protect downstream processes and equipment from damage or contamination.

Variability in Design: Externally fed rotary drum screens come in various designs, including different drum configurations, materials, and sizes. The choice of design depends on factors such as the type of solids being removed, the flow rate of the liquid, and the specific requirements of the application.

Overall, externally fed rotary drum screens play a crucial role in the treatment and purification of liquid streams by effectively separating solid contaminants, improving water quality, and protecting downstream processes and equipment.

Externally Fed Rotary Screen Drum screen Advavtage

• Most efficient screening technology
• Sieve/drum separating part of the fats / oils
• Structure & Drum in stainless steel 304 or 316L

Externally Fed Rotary Screen Drum screen Feature

• Screen cylinder of heliical–wound wedge wire
• Screen slot openings 0.005” to 0.250” for a variety of applications
• Screen assembly complete with internal support(s), tie rods, end rings, hub and shafts
• Influent headbox designs to handle pumped or gravity flow feed, complete with flow dampening weir(s)
• Influent overflow bypass piping
• Chassis designs for open or enclosed filtrate discharge
• Internal CIP manifold assembly with sprays designed for high pressure cleaning
• Solids discharge blade assembly of UHMW construction
• Shaft mounted, variable speed drives
• All metal components of stainless steel construction

Externally Fed Rotary Screen Drum screen Application

• Industrial WWT (incl. Sludge Treatment)
• Abattoirs (Slaughterhouses)
• Beverage Industry Waste Water
• Food Processing & Catering Waste Water
• Fruit & Vegetable Processing Waste Water
• Pulp & Paper Processing, Starch & By-products Processing
• Tanneries, Dyeing Works
• Plastics Recycling Industry Waste Water
• Livestock Breeding (Manure Treatment)
• Municipal Waste Water Treatment (incl. Sludge Treatment)
• Clean Water Treatment
• Industrial Solid Waste Handling & Treatment / Animal By-products Handling & Processing
• Incinerators