A Rotary Drum Screen by is a continuous, self-cleaning mechanical filtration device designed for fine screening applications in water and wastewater treatment. It consists of a rotating cylindrical drum covered with a filtration screen, typically made of wedge wire or perforated plate. As water flows into the drum interior, solids are retained on the inner screen surface. The rotating action lifts the captured solids out of the water, where a high-pressure spray system cleans them into a collection trough. This design provides reliable, automated removal of fine particles and fibrous materials, protecting sensitive downstream processes.
Advantages of Rotary Drum Screens
Effective Fine Screening: Capable of removing fine solids and suspended materials with screen apertures as small as 0.25 mm (250 microns), providing superior protection for membrane systems, UV disinfection, and other sensitive equipment.
Fully Automated & Continuous Operation: The entire process-screening, solids lifting, and cleaning-is continuous and automated, requiring minimal operator intervention and ensuring consistent effluent quality.
Compact Footprint & Enclosed Design: The vertical or slightly inclined cylindrical design offers a large screening area within a small footprint. The fully enclosed housing minimizes odor release, contains splashing, and improves overall site aesthetics and safety.
Low Hydraulic Head Loss: Designed for gravity-fed operation with minimal head loss (typically 300-600 mm), reducing the need for upstream pumping and saving energy.
Versatile & Robust Construction: Engineered for reliability in harsh environments with corrosion-resistant materials (stainless steel, abrasion-resistant coatings) and a simple, low-maintenance drive mechanism.
Structural Features of Rotary Drum Screens
The reliable performance is ensured by its integrated design:
- Rotating Drum Assembly: The core component-a cylindrical drum skeleton covered with a durable screen panel (wedge wire, perforated plate, or mesh). The drum is supported by heavy-duty trunnion wheels and a central shaft.
- High-Efficiency Screen Panels: Available in various aperture sizes and materials (e.g., stainless steel wedge wire) to balance screening efficiency, strength, and resistance to clogging.
- Internal Feed & Distribution System: Inlet water is evenly distributed inside the drum via an internal launder or feed pipe, ensuring optimal utilization of the entire screen surface area.
- High-Pressure Backwash Spray System: Positioned at the top of the drum rotation, a series of nozzles delivers a focused, high-pressure spray (water or filtrate) to dislodge captured solids into the collection trough.
- Drive Unit & Supporting Frame: A robust external gear motor or chain drive provides smooth rotation. The entire assembly is mounted on a carbon steel or stainless steel frame for easy installation and alignment.
- Collection Trough & Solids Conveyor: A integrated trough collects the washed solids, which are then typically conveyed by a screw conveyor for dewatering and disposal.
Applications of Rotary Drum Screens
Municipal Wastewater Treatment:
Ideal for primary treatment (following coarse screens) or as a final screen before discharge or advanced treatment (like membranes), effectively removing fine solids.
01
Industrial Process Water & Wastewater:
Used in food processing, pulp and paper, textiles, and other industries to recover product, remove fibrous materials, or meet stringent pre-treatment standards.
02
Intake Screening for Seawater Desalination & Power Plants:
Provides effective pre-filtration of seawater or cooling water, protecting downstream ultrafiltration (UF) systems and heat exchangers from fouling.
03
Stormwater & Combined Sewer Overflow (CSO) Treatment:
Effectively captures fine sediments and floatables from stormwater runoff, improving water quality before discharge.
04
Comparison with Other Screening Technologies
|
Feature |
Multi-Rake Bar Screen |
Single-Rake/Catenary Screen |
Chain-Driven Screen |
|
Cleaning Continuity |
Continuous operation; cleans without flow interruption. |
Flow interruption during raking cycle. |
Often continuous, but single rake. |
|
Debris Load Capacity |
Very High; ideal for high/fluctuating loads. |
Moderate. |
High, but can be prone to jamming. |
|
Mechanical Complexity |
Higher (multiple drives). |
Lower. |
Moderate to High. |
|
Footprint |
Moderate, optimized for width. |
Can be very long (catenary type). |
Varies. |
|
Ideal Application |
Large municipal WWTPs, high-flow industrial intakes. |
Smaller plants, moderate flows. |
Various, but may struggle with heavy ragging. |
Summar
In summary, Rockerhill Rotary Drum Screen is a versatile, efficient, and reliable solution for automated fine screening. Its enclosed design, continuous self-cleaning operation, and ability to handle a wide range of screen sizes make it an ideal choice for protecting critical downstream processes in both municipal and industrial water treatment plants. By effectively removing fine solids with minimal operator attention and a compact footprint, ROCKERHILL delivers a screening solution that enhances overall system reliability, reduces maintenance burdens, and ensures consistent water quality outcomes.
At ROCKERHLL, we engineer our Rotary Drum Screen to remove particulates from liquids, offering a superior, space-saving alternative to conventional settling tanks for primary water and wastewater treatment.
Based on different applications and special requirement from Client, ROCKERHLL customize the design and manufacture accordingly.
With ROCKERHILL patented technology, our special design of disc filters have been widely applied in many developed countries like USA, Australia, Spain, South Korea. Our client includes Veolia, General Dynamics and LG chemicals.
performance
|
Project Name |
Treatment Capacity |
Project Category |
End User/Destination |
COD |
|
Gansu Jinlin Lithium Battery New Material Co., Ltd. Lithium Battery Production Wastewater Treatment Project |
8,000 t/d |
Rotary drum screen |
Gansu Jinlin Lithium Battery New Material Co., Ltd. |
2023.7 |
|
Ningxia Changyi Clean Energy Co., Ltd. 200 kt/a Coal-to-Ethylene Glycol Project Wastewater Treatment Project |
15,000 t/d |
Rotary drum screen |
Ningxia Changyi Clean Energy Co., Ltd. |
2025.2 |
|
National Pipeline Project - Shanxi Branch Pingyao Station Domestic Sewage Treatment System Renovation Project |
15,000 t/d |
Rotary drum screen |
National Pipeline Project - Shanxi Branch |
2022.1 |
|
Shandong Yigong Materials Technology Co., Ltd. Wastewater Treatment Station Renovation Project |
95,000 t/d |
Rotary drum screen |
Shandong Yigong Materials Technology Co., Ltd. |
2020.3 |
|
Huacheng Electronics N9 Project Wastewater Station Renovation Project |
50,000 t/d |
Rotary drum screen |
Huacheng Electronics |
2021.5 |
|
Aro Anna Fruits (Dachang) Co., Ltd. Wastewater Station Renovation Project |
50,000 t/d |
Rotary drum screen |
Aro Anna Fruits (Dachang) Co., Ltd. |
2020.4 |
|
Gansu Jinlin Lithium Battery New Material 200 kt/a Wastewater Treatment System Project |
10,000 t/d |
Rotary drum screen |
Gansu Jinlin Lithium Battery New Material Co., Ltd. |
2018.7 |
|
Shijiazhuang Zhonghong New Materials Co., Ltd. Wastewater Treatment Project |
40,000 t/d |
Rotary drum screen |
Shijiazhuang Zhonghong New Materials Co., Ltd. |
2019.2 |
|
Huludao Lianshi Chemical Wastewater Standard Upgrading and Renovation Project |
100,000 t/d |
Rotary drum screen |
Huludao Lianshi Chemical Co., Ltd. |
2022.1 |
|
Aro Anna Fruits (Dachang) Co., Ltd. Wastewater Station Renovation Project |
10,000 t/d |
Rotary drum screen |
Aro Anna Fruits (Dachang) Co., Ltd. |
2022.1 |
|
Inner Mongolia Zhonghui Pharmaceutical Co., Ltd. Doxycycline and Oxytetracycline Production Wastewater Treatment Project |
10,000 t/d |
Rotary drum screen |
Inner Mongolia Zhonghui Pharmaceutical Co., Ltd. |
2022.1 |
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