3 models · Screens & Drum Filters
Screening & Filtration
Screening and filtration equipment removes floating debris, rags, fibers and suspended solids from water before they can damage pumps or overload downstream treatment. Mechanical bar screens are used at the inlet of municipal and industrial wastewater plants, while rotary drum filters (micro screens) are used for fine solids removal in wastewater, process water and recirculating aquaculture systems.
Screens & Drum Filters: available models
How it works
How screening & filtration work
A mechanical bar screen is installed in a channel at an angle to the flow. Water passes between parallel bars or a mesh, and solids larger than the openings are retained. A rake or chain-driven mechanism lifts the captured material to a discharge point, where it drops into a bin or conveyor. A rotary drum filter consists of a slowly rotating drum covered with fine mesh. Water flows through the mesh, leaving solids on the screen surface. As the drum turns, a spray bar backwashes the retained solids into a collection trough, allowing continuous filtration without stopping flow.
Selection guide
How to choose the right model
- 01
Opening size
Coarse screens protect pumps and equipment, fine screens reduce solids loading on downstream processes, and micro screens capture very fine particles. Choose the opening to suit the process objective.
- 02
Flow rate and channel dimensions
Size the screen for peak flow at an acceptable approach velocity and head loss. Existing channel width and depth often fix the frame size.
- 03
Type of solids
Rags, fibers, hair, grease and sand behave differently on screens. Fibrous or sticky solids may require a specific screen design or cleaning method.
- 04
Cleaning and backwash
Check the cleaning mechanism, backwash water demand and pressure, and how screenings will be washed, compacted or removed.
- 05
Materials and environment
Stainless steel is common for wetted parts. Consider corrosion, outdoor exposure and whether the screen must be enclosed for odor control.
Typical applications
- Municipal wastewater plant headworks
- Pump station protection
- Food processing and slaughterhouse wastewater
- Pulp and paper fiber recovery
- Recirculating aquaculture systems
- Textile and tannery effluent
- Pretreatment before DAF or MBR
Learn more
Related projects & guides
Rural Village & Resort MBR Sewage Treatment Plant
- Capacity
- 50–500 m³/day
- Process
- Screen + A/O + MBR + disinfection
Dairy Wastewater DAF Pre-Treatment & Sludge Dewatering
- Capacity
- 100–1,000 m³/day
- Process
- Drum screen + DAF + screw press
Hospital Wastewater Treatment with On-Site Disinfection
- Capacity
- 50–1,000 m³/day
- Process
- A/O + lamella clarifier + NaOCl disinfection
FAQ
Screening & Filtration: FAQ
What is the difference between a bar screen and a rotary drum filter?
A bar screen uses parallel bars or a mesh in a channel to remove coarse and medium debris. A rotary drum filter uses fine mesh on a rotating drum with backwash to remove much finer suspended solids.
Why is screening important before MBR treatment?
Membranes are vulnerable to hair, fibers and debris that can clog or damage modules. Fine screening upstream is a standard requirement for reliable MBR operation.
How are rotary drum filters cleaned?
Spray nozzles backwash the mesh from the inside or outside as the drum rotates, washing retained solids into a trough. Cleaning is automatic and can be triggered by water level or timer.
Are rotary drum filters used in aquaculture?
Yes. They are widely used in recirculating aquaculture systems to remove fish feces and uneaten feed before biological filtration.
Request a quotation
Need screens & drum filters for your site?
Tell us the flow, the water or sludge you are treating and the result you need. A process engineer sizes the equipment and replies within one business day.