Externally Fed Rotary Drum Screens and Strainers

Dontech Industries’ Externally Fed Rotary Drum Screens and Strainers are engineered for the removal of suspended solids from process and wastewater streams

• Chassis for open or enclosed filtrate discharge

• Internal CIP manifold with sprays for high-pressure cleaning

• Solids discharge blade assembly (UHMW construction)

• Shaft-mounted, variable-speed drives

• All metal components in stainless steel unless otherwise specified

How Externally Fed Rotary Drum Screens Work

Externally fed rotary drum screens are used in wastewater treatment processes and other industrial applications to separate solid materials from liquid. These screens consist of a rotating drum with slots on its surface. Understanding the process.

Separate Solids from Liquid

Externally fed rotary drum screens remove solids from process and wastewater streams. In other words, they protect downstream equipment and improve water quality before the next treatment step.

Capture Debris with the Right Slot Size

As liquid flows onto the drum, the screen surface captures debris on the outside. Meanwhile, screened liquid passes through the slots. For example, larger slots let larger particles pass, while smaller slots capture finer solids. Because of that, slot size depends on your flow rate, particle size, and performance goals.

Keep Performance Steady with Cleaning

To prevent buildup, Dontech adds a cleaning system that helps keep the screen open. Typically, spray nozzles rinse the drum as it rotates, and the doctor blade helps remove solids that stick to the surface. As a result, the screen maintains consistent throughput with less risk of clogging.

Match the Design to Your Application

Externally fed rotary drum screens come in different configurations, including drum size, slot opening, piping layout, and sump options. Therefore, the best design depends on your influent, flow rate, and how you handle the removed solids.

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

How Dontech Builds Externally Fed Rotary Drum Screens

Dontech Industries Inc specializes in custom fabrication of externally fed rotary drum screens. We follow a clear, step-by-step process so every screen matches your application, performance goals, and site requirements.

Initial Consultation

To start, we meet with you to understand your process needs. We review the material you want to screen, flow rate, solids type and size, and any special requirements. In addition, we discuss operating conditions and maintenance preferences so the final design fits your system.

Design and Engineering

Next, our engineering team turns your requirements into a custom design. With over 45 years of experience, we size the drum and select slot openings to match your flow and solids profile. As a result, the screen delivers consistent separation while supporting your downstream equipment.

Material Selection

Then we choose materials that match your environment and duty cycle. We typically use corrosion-resistant, durable materials such as stainless steel, carbon steel, and selected polymers, depending on the application. Therefore, your screen holds up under real-world operating conditions.

Fabrication and Manufacturing

After we finalize the design, our technicians fabricate the screen using skilled craftsmanship and modern equipment. We build the drum, screening media (wedge wire or perforated), support structure, drive components, and related assemblies to the required specifications.

Custom Features and Modifications

In addition, we can add custom options to match your installation and layout. For example, we can tailor inlet and outlet locations, sump size, discharge setup, leg length, access covers, and other site-specific details.

Quality Control and Testing

Before shipping, we perform thorough quality checks and testing. We verify critical dimensions, fit-up, and functional performance so the screen meets your design targets. As a result, you receive equipment you can trust from day one.

Delivery and Installation

Once the unit passes inspection, we prepare it for delivery to your facility. If needed, we can also support installation to ensure proper placement, alignment, and integration into your process or treatment system.

Training and Ongoing Support

Finally, we provide training and ongoing support so your operators and maintenance team can run the equipment efficiently. In other words, we help you protect performance long after startup.

Documentation Package

We also supply a documentation package that includes drawings, specifications, and maintenance guidelines. Therefore, your team has clear references for operation, service, and future upkeep.

By following this process, Dontech Industries Inc designs, builds, and delivers externally fed rotary drum screens that match your treatment or process needs. Custom fabrication ensures the right fit, reliable performance, and long-term efficiency.