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- Rotary Drum
Rotary Drum
The Stainless Steel Wedge Wire Rotary Drum Screen (also known as a Rotary Drum Strainer or Micro-Screen) is a continuously and automatically operating front-end solid-liquid separation device. Its core component is a large cylindrical drum installed horizontally or at a slight incline. The entire circumferential surface of the drum is covered with a stainless steel wedge wire screen (Johnson screen). The wastewater to be treated flows into one end of the drum. Under gravity, the filtrate passes through the wedge wire slots, while solid suspended matter (such as fibers, hair, plastic pieces, and fine particles) is retained on the inner surface of the drum. As the drum rotates slowly, the retained debris is lifted to the top, where it is flushed by spray water into a collection trough, achieving a continuous process of automatic screening, filtration, and residue removal
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Rotary Drum
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Application
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Working diagram
Product Features and Advantages
High Screening Efficiency and Stable Effluent
Utilizes high-precision wedge wire screens (typically with slots from 0.1-5mm), effectively removing fine suspended solids and fibrous materials, significantly reducing the load on subsequent treatment units.
Excellent Anti-Clogging and Self-Cleaning Capabilities
The V-shaped slots of the wedge wire screen feature a “self-cleaning” design, preventing fibrous materials from tangling and clogging.
Equipped with a standard high-pressure spray wash system that effectively backwashes the screen during rotation, maintaining screen permeability and preventing blockages.
High Strength and Extended Service Life
All-stainless steel construction (304/316L). The wedge wire screen is securely welded to the support frame, capable of withstanding long-term scouring of water flow and mechanical stress. It offers superior corrosion resistance and a much longer service life than ordinary screens.
Product Parameters
| Parameter Category | Typical Specifications & Descriptions |
| Core Filtration Media | Stainless Steel Wedge Wire Screen (Johnson Screen), fully welded structure. |
| Filtration Rating (Slot Size) | Common Range: 0.1mm – 5.0mm
• Ultra-fine Screening: 0.1 – 0.5 mm (for advanced pretreatment) • Standard Fine Screening: 0.5 – 2.0 mm (most widely used) • Coarse Screen Replacement: 2.0 – 5.0 mm (replaces traditional coarse screens, no raking required) |
| Drum Diameter | φ800mm – φ3000mm or larger, designed based on capacity. |
| Drum Length | Typically 1m – 5m, matched with diameter to determine single-unit capacity. |
| Material | 304/316L Stainless Steel. |
Application Areas/Scenarios
Municipal Wastewater Treatment Plants
After the Influent Pump Station: Serves as a fine screen, replacing or supplementing traditional step screens or rake-type bar screens to remove finer debris, protecting downstream pumps and biological processes.
Before/After Primary Sedimentation Tanks: Further removes suspended solids to reduce the load on secondary clarifiers.
Industrial Wastewater Pretreatment
Pulp & Paper Wastewater: A core device for removing paper fibers.
Food Processing Wastewater: Intercepts meat scraps, peels, fruit/vegetable residues.
Textile & Dyeing Wastewater: Removes lint, fibers, thread ends.
Slaughterhouse & Aquaculture Wastewater: Removes hair, feathers, viscera fragments.
Stormwater Treatment and Combined Sewer Overflow (CSO) Control
At stormwater pump stations or storage tank outlets, intercepts plastics, leaves, and other floating/suspended pollutants in rainwater to protect receiving water bodies.
Water Intake Protection
Serves as a primary filtration barrier at river or lake water intakes to intercept aquatic weeds, floating debris, and some sediments.
Other Fields
Industrial Recirculating Cooling Water Side-Stream Filtration.
Aquaculture Water Treatment.
Summary
The Stainless Steel Wedge Wire Rotary Drum Screen is a highly efficient, reliable, and extremely low-maintenance mechanical pretreatment device. It successfully combines the excellent filtration performance and anti-clogging characteristics of the Johnson wedge wire screen with the continuous automatic operation mechanism of the rotary drum system. It addresses the pain points of traditional screens, such as insufficient removal of fine debris, frequent clogging, and high maintenance. It is particularly suitable for wastewater streams rich in fibers, hair, and other tangle-prone materials, serving as a critical front-end safeguard to enhance the stability and efficiency of the entire treatment system.
OUR PRODUCTS
Best-selling Products
Starch Screen
The Wedge Wire Starch Curved Screen is a curved screening device specifically designed for the starch industry. It features an arc-shaped screen surface made of precisely welded V-profile stainless steel wires, utilizing centrifugal force or gravity to achieve rapid dewatering and classification of starch slurry. Its curved structure prolongs slurry retention time, improving solid-liquid separation efficiency. It is suitable for starch extraction, refining, and byproduct recovery processes for starches such as potato, corn, and cassava. Characterized by efficient screening, wear and clogging resistance, and easy maintenance, this equipment is a key solid-liquid separation device in modern starch processing.
Screen Basket for Screw Press Separator
The stainless steel wedge wire screen basket, commonly known as the "V-wire screen," "press screen basket," or "screen cylinder," is a core component of screw press solid-liquid separators. It is installed inside the spiral press, enclosing the rotating screw shaft. The working principle is as follows: raw slurry with high moisture content is pushed into the screen basket by the screw shaft. Under the squeezing and conveying action of the spiral flights, the liquid (filtrate) is forced out through the precise, continuous slots of the screen basket, while the solid material (manure cake) is retained inside and continues to be compressed and dewatered as it moves forward. Finally, the dewatered solids are discharged from the outlet, achieving solid-liquid separation.
Wedge Wire Vibrating Screen
A stainless steel wedge wire vibrating screen is a solid-liquid separation device featuring a screen surface made by precisely welding V-shaped stainless steel wires, integrated with a high-frequency vibration system. With uniform slots, wear resistance, and corrosion resistance, it is suitable for wet screening and dewatering operations. The vibration mechanism enables rapid material dispersion and efficient sieving while effectively preventing screen clogging. Widely used in industries such as mining, metallurgy, food processing, and environmental protection, it is particularly suitable for handling fine particles, high-viscosity, or easily agglomerated materials, offering advantages such as high screening accuracy, large processing capacity, and long service life.
Wedge Wire Water Well Screen
Johnson Deep Water Well Screens, also referred to as continuous slot screens or wire wrap screens, were originally developed to solve sand control challenges in fine-grained and uniform sand formations. These geological conditions are commonly encountered in deep groundwater aquifers, where conventional perforated pipes often suffer from clogging, excessive sand production, and reduced well efficiency.
Sintered Mesh Plate and Disc
Sintered Mesh Plates and Discs are high-precision filtration components fabricated by bonding multiple layers of stainless steel wire mesh through a specialized vacuum sintering process. Unlike traditional mesh that relies on mechanical weaving alone, these plates are fused at every contact point, transforming individual wires into a rigid, integrated porous metal sheet.
These plates can be customized into various shapes, most commonly circular discs, to fit specific industrial equipment. They offer an ideal balance of high permeability, extreme structural integrity, and precise filtration ratings. Because they are made entirely of metal (typically 304 or 316L), they provide a "permanent" filtration solution that can withstand high temperatures and corrosive chemicals while remaining fully cleanable and reusable.
Sintered Mesh Filter Cartidge
The Sintered Mesh Filter Cartridge is a high-performance, precision filtration component manufactured by bonding multiple layers of woven wire mesh (typically stainless steel 316L or 304) through a specialized vacuum sintering process. Unlike traditional fiber-based or single-layer mesh filters, this process creates a permanent molecular bond between every wire intersection, resulting in a porous metal structure with exceptional mechanical strength and structural integrity.
This cartridge is designed for demanding industrial environments where high pressure, extreme temperatures, and corrosive fluids are present. Its defining characteristic is the ability to provide precise, consistent filtration ratings while remaining fully cleanable and reusable, making it an eco-friendly and cost-effective alternative to disposable filter elements.
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