Screening plays a vital role in the municipal and industrial wastewater treatment process. Proper screening protects wastewater treatment equipment and improves operations. Typically, the screen is the first device used at wastewater treatment plants and is designed to remove any large objects and prevent damage and clogging of downstream equipment, piping, and appurtenances. For expert advice contact us now.
Hydro-Dyne’s Great White Centre/Dual Flow Continuous Band Screen is designed to handle low-to-high flows and has been independently certified to have one of the highest screenings capture ratio of all band screens on the market.1 The dual spray wash, patented grid design, proprietary sealing system and UHMWPE guide links make this an exceptional product for the filtering and offloading of water and wastewater screenings.
Very low headlosses and extremely strong, well-reinforced grids make these centre flow (centre entrance, side exit) and dual flow (side entrance, rear exit) screens suitable for several applications in municipal and industrial water and wastewater solutions.
1 UK Water Industry Research in National Screen Evaluation Facility Inlet Screen Evaluation Comparative Report (1999—2015).
Features
This high capacity, continuous band fine screen has low headloss and zero carryover. It provides excellent protection to downstream processes such as membrane technology. The proprietary design easily captures and offloads screenings including rags and stringy material. Design features include:
Grid opening range: 0.5—25 mm
Flow capacity: 5—5,500+ L/s
No submerged sprockets, bushings or bearings
Heavy-duty reinforced structural supports for unlimited differential
Rear bypass gate
Proprietary grid-to-frame and panel-to-panel sealing system held to <0.5 mm
Proprietary low friction UHMWPE guide links that reduce maintenance and operations costs
Dual spray wash unloading
All maintenance is above channel.
This screen has an excellent screenings capture ratio that has been independently certified as highest screening capture ratio of 45 screens.
Hydro-Dyne’s Bull Shark Through Flow Band Screen is ideal in a wide range of environments and is available in a variety of grid types, opening sizes and models. The screen’s extremely strong stainless steel grid reduces headlosses to well below industry standards. All stainless steel construction and UHMWPE wear surfaces provide years of trouble-free operation.
Features
This heavy duty, high capacity continuous through flow fine or coarse band screen is ideal for large solids removal. This extremely reliable and versatile screen series is available in different models to suit each specific purpose: Standard, Heavy Duty, Super Duty, Front Discharge and Low Flow. Features include:
Grid opening range: 0.5—75 mm
Flow capacity: 5—7,000+ L/s
Unlimited support against deflection
Coarse or fine screening
Patented grid design with interchangeable opening types
Continuous belt design that eliminates potential for jamming
No submerged sprockets, bushings or bearings
Stainless steel links and supported panels
Directly retrofits into existing channels and can pivot for bypass
The Kuhn KHU Boomerang XL Multi-Rake Bar Screen (KHU-B XL) has been developed to achieve maximum flow rate with minimal headloss. The unique frame construction of the KHU-B XL extends the screen to the channel walls, utilising the full width of the channel. Capable of managing high grit loads, this screen is ideal for treatment plants that are subject to sudden or extreme loads.
Features
The KHU-B XL Multi-Rake Bar Screen is suitable for a large range of applications. Its unique features include:
Optimised flow — approximately 30% higher throughput
Boomerang technology that enables screenings to be removed almost at channel bottom
No side frame losses
Wedge wire technology to prevent screen grid clogging
Fully automated cleaning operation — no brushes, no washing water consumption
Temporary backward running for self cleaning
Drive with overload protection
Screen frame — stainless steel
Drive chain — hardened high-grade steel
Additional rake beams can be retrofitted
Simple maintenance, few wearing parts
No attachments are necessary at the channel floor.
The Kuhn KHU KN Multi-Rake Bar Screen differs from other multi-rake bar screens with a flat, inclined, separation surface that is normally set at an inclination angle of 30°—40°. This screen has been designed to use in pre-existing channels. With its optimised filtration capacity and faster cleaning speed this rake is suitable for situations where there is an accumulation of screenings with high impact forces.
Features
The Kuhn KHU KN Multi-Rake Bar Screen is suitable for very large hydraulic heads and channel widths. Its features include:
Drive chains of hardened stainless steel
Stable screen frame with maintenance openings
Replaceable segmented rakes
Fully automated scraper — no brushes or water consumption
The Kuhn KHU SL Multi-Rake Bar Screen is a reliable option for small to medium sized channels. With a hydraulically optimised 45° installation angle, this screen features an open design which maximises the screen grating width and results in a raking field across most of the channel.
Features
The Kuhn KHU SL Multi-Rake Bar Screen features:
Optimised throughput levels
45° installation angle
An open, stable system frame minimises side frame losses
Handles small stones to large debris
Simple and robust components
Wedge wire technology
Tempered stainless steel drive chains
Segmented rake comb
Defined positive meshing of rake comb plates ensures minimal clogging
Clearing bars with staggered alternating tooth system
Fully automated scraper — no brushes or wash water consumption
The Kuhn KHU Multi-Rake Bar Screen has been designed to meet extreme conditions. It is a reliable solution when maximum channel/highest discharge heights are needed, particularly where large throughput volumes or extremely wide channels are involved. This bar screen has a stable and robust design that makes it ideally suited to plants characterised by high volumes of disturbance material (stones, sand, etc.). Oversizing of stress-related elements ensures that components, and the entire system, enjoy a long service life.
Features
This multi-rake bar screen has been designed for maximum conveying levels and channel widths, maximum separation capacity and excellent purification speed of screen surfaces. Its features include:
Stable screen frame made of folded profiles with optimised strength characteristics
Fully automatic scraper — no brushes, no washing water consumption
Guided penetration of rakes
Overload protection — protects the machine against damages
Retrofitting of additional rakes for flushing and rain weather flows possible
Segmented rakes can be easily replaced
Two different purification speeds (optional)
Simple maintenance
No attachments are necessary at the channel floor.
Hydro-Dyne’s Tiger Shark Multi-Rake Bar Screen has been designed for large particle removal and efficiently captures a wide variety of debris. It’s heavy-duty stainless steel rakes continuously clean the bar rack with grid openings from 5—300 mm. Minimal friction is achieved using UHMWPE guide links — reducing wear and maintenance. This screen combines reliability with efficient operation.
Features
This high lift, low maintenance, coarse screen has no submerged sprockets, bearings or bushings enabling easy installation and maintenance. This screen can be retrofitted into existing channels. Features include:
Grid opening range: 5—300 mm
Particle removal up to 450 mm
Flow capacity: 44—6,570+ L/s
Fabrication materials: T304, T316, super duplex, high nickel stainless steels (solid stainless steel sprockets and drive shaft)
Proprietary low friction UHMWPE guide links
Patented sealing system (tight tolerance down to 0.5 mm)
Direct drive (no chains or sprockets)
Fractional hp and kW requirements
Jam protection with auto-reverse and clear
Unloading does not require spray or wash brushes
Adjusts to tension grid to extend wear life of screen.
The Kuhn KGR Knuckle Rake Screen is highly robust, hard wearing and corrosion resistant. It is suitable for installation into small channels, shafts or pumping stations without special hydraulic requirements. The longitudinally stable chain design makes it possible to have a loop-shaped hanging mode of operation, enabling the rake bars to centre themselves and ensuring the teeth of the rake plates penetrate deeply between rake bars — blockages of the bar rack are minimised.
Features
The Kuhn KGR Knuckle Rake Screen features include:
A stable, corrosion resistant cast stainless steel chain
Longitudinally stable chain design
Stainless steel bar rack
Self-centring clearing paddles — clogging of bar rack avoided
Space saving installation: 70°—75°
Fully automated scraper — no brushes or water consumption
Rake combs that extend deep into the bar sections — enables thorough cleaning
The Kuhn KST Drum Screen can be adapted to meet the ever-changing developments and expectations of the modern wastewater treatment industry. The hole diameter of the very fine drum screen inside the machine can be adjusted. This ensures particulate in raw wastewater is reliably separated out under stable operating conditions.
The unique construction of the Kuhn KST Drum Screen delivers a high filling level which then provides a large effective screen surface area — resulting in a substantial increase in throughput.
Features
The excellent design of the Kuhn KST Drum Screen offers the following benefits:
Fine screening down to 1 mm hole size possible
A hole width that can be adjusted
A high filling level, that then increases the effective filter surface area
High throughput rates
Adjustable position of the drainage nozzle
Optimised rinsing water consumption
Highly stable, corrosion-resistant components
Safe cleaning of the screen cover by the spray nozzle strip and brush strip
Automatic change in rotational direction
Odour and hygienic encapsulation of the entire machine
The Kuhn KSS Spiral Screen represents a new generation of fine screen filters which conforms to state-of-the-art technological standards, both in production and onsite operation. It provides the complete treatment of screenings in a single machine — separation, washing and pressing. Fault-free operation, long service life, less maintenance and simple integration into existing plants are just some of the advantages of this type of machine.
Features
The superior design of the Kuhn KSS Spiral Screen ensures optimum operation in terms of environmental-friendliness and cost effectiveness, as well as long-term security of your investment. Its features include:
Simple machine with low operating costs
Flow rates of up to 60 litres/second for low and medium flows
Complete treatment of screenings in a single machine (separation, washing, pressing)
Heavy duty spirals (shaftless)
Highly maintenance-friendly
Intelligent ‘release system’ to facilitate brush changes
Low energy requirement
Can be swivelled out of the flume for maintenance purposes
High degree of operational reliability due to robust design and the use of high-quality materials.
The Kuhn KSR Step Screen is a robust stainless steel screen that is predominantly used in the preliminary treatment of municipal and industrial waste. The screen comprises both movable and fixed lamella ‘steps’.
In normal operation the lamellas remain stationary. Solid matter is caught by the step-like screening surface forming a mat which is responsible for the main filtration. Once a difference in water level is identified across the screen then the moving lamellas elevate the screenings mat up one or two steps before stopping once again, releasing the flow through the screen and reducing the level once again. The screen stepping stops and again the system awaits for a level rise to repeat its cleaning process.
Sound control of a step screen can yield improved results for screenings capture. The screenings mat greatly assists in the capture of smaller aperture screenings in relation to the selected lamella gap width.
Features
The superior design of the Kuhn KSR Step Screen ensures optimum operation in terms of environmental-friendliness and cost-effectiveness. Features of this screen include:
Low space requirement
Substantial frame assembly
Maximum throughput and separation capacities, small hydraulic height loss
Screen grid with largest effective grid width in the world available
Gap width: 1—6 mm
Lamella thickness: 2 mm or 3 mm
Self-cleaning screen surface. No brushes or scrapers and no additional washing water required
Heavy duty screen frame made of folded profiles with optimised strength characteristics
Gear motor acting as drive unit enclosed in separate housing (providing protection against aggressive and damp sewage vapours)
Chain drive unit with automatic tensioning device
Drive unit and bearings are generally situated above the waterline
Removable covers for hygienic enclosure above the channel
The Haigh Engineering Company’s centre flow ACE Band Screen has an exceptional screenings capture ratio of 79% for 5 mm screening and 94% for 2 mm screening.1 This band screen is ideal for both concrete channel and pipeline installations.
1 UK Water Industry Research in National Screen Evaluation Facility Inlet Screen Evaluation Comparative Report (1999—2015).
Features
The Haigh Engineering Company’s ACE Band Screen features include:
High screenings capture ratio
Standard screen perforation options of 2 mm, 3 mm and 5 mm
Low headloss — 160 mm at 150 L/s
Stainless steel construction
Polypropylene 30% glass filled UV stabilised black screen panels
Configurable screen plates
Efficient deluge cleaning system with integrated self-adjusting scraper mechanism
Flexible installation and easy in-situ maintenance.
