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Aqseptence Group GmbH, Division Water Processing Solutions

  • Booth: 3231

Designers/manufacturers of water intake solutions.

A leading supplier of water intake solutions, more than 125 years of experience as original equipment manufacturer (OEM), more than 30,000 installations worldwide, and reliable, robust equipment. Solutions include: Geiger MultiDisc, Geiger Revolving Chain Screens, Johnson Offshore Intake/Hydroburst systems and Fish Return Systems.  

Brands: Geiger® - Johnson Screens® - Passavant® - Noggerath®


  • Geiger MultiDisc®
    An especially robust and compact travelling water/band screen with a central chain and self-supporting frame....

  • To meet modern industrial requirements, Aqseptence Group specially developed and manufactured the renowned, innovative Geiger MultiDisc® Screen. This innovative development marked one of the greatest technical breakthroughs in the area of screening technology in the past 20-30 years. Geiger MultiDisc® is used worldwide for the filtration process/fine screening to protect pumps, condenser tubes and other critical equipment.

    Geiger MultiDisc® Screens are reliable, heavy-duty, low-maintenance travelling water screens with an operational life time of 35 years. Over 200 installations worldwide during the past 10 years (approximately 40 of these are in nuclear power stations) are clear proof of the Geiger MultiDisc®’s success and effectiveness in terms of total CAPEX (investment costs) and OPEX (operational costs) saving.

    The advantages are:
    - Compact design = significant savings in construction costs
    - Fast and simple plug-in installation / saving installation time
    - Fish protection-compliant (EPA CWA 316b)
    - Low operating costs: Only one maintenance-free side bar chain
    - Self-supporting frame to simplify installation
    - Easy maintenance; mesh panels can be changed at floor level (no need for channel dewatering)
    - Less space/smaller footprint 
    - Easier installation
    - Lower pressure loss: water only passes through the mesh once
    - Highly robust
    - Zero carryover of debris to the clean water side


    The Geiger MultiDisc® Screens consist of rotating sickle-shaped mesh panels made of wire mesh or of perforated plastic (PE or POM). A single carrier chain connects the panels at the rear and runs through a deflection unit at the bottom and a sprocket coupled with a drive unit at the top. The mesh panels run on guide ways on both sides and form a unit together with the supporting structure. 

    The retained debris is transported to floor level by debris carriers and efficiently removed using a spray-water device. This device is situated behind the mesh panels, cleaning them intensively in both an upwards and downwards direction.

    Geiger MultiDisc® Screens are installed in the free channel and fixed to the side walls. As they are installed across the channel they require much less space than standard Travelling Band Screens, helping to considerably save on construction costs.


    - Channel width: 1.0 - 3.5 m
    - Channel depth: 1.2 - 25 m
    - Discharge height: 0 - 2.0 m
    - Installation angle: 90°
    - Chain speed: approx. 0.12/0.24 m/s
    - Construction height above floor: up to 4.5 m
    - Mesh panel apertures: 500 μm - 10 mm
    - Flow capacity: up to 50,000 m3/h (per channel/per machine)

    Design Features

    - Only one active screening area
    - Less pressure loss/only one passage through the mesh
    - Maintenance-free side bar chain
    - Best adaptation of flow/cleaning efficiency ratio thanks to variable chain speeds
    - Intensive mesh panel spraying by external control (no brushes)
    - Adjustment of chain tension at floor level
    - In case of usage in sea water, the option of installing special anodes for cathodic corrosion protection
    - Automatic operation by differential sensor and timer
    - Zero carryover
    - Less space/easier maintenance and installation

    Best Available Technology (BAT 316b Screens)

    Geiger® screens such as the Multi-Disc® are particularly fish-friendly and pre-approved according to the EPA 316b Clean Water Act
    (CWA) as best state-of-the art fish protection screen.

    Specially designed fish buckets attached to the screen panels retain some of the water during its upward travel, thereby allowing
    any captured fish ”to survive within the water“ once the fish buckets exit the water level. As fish may retain adhered to steel alloy surfaces,
    the fish buckets are surface treated with a special sliding composite material.

    A low pressure spraying device enables organisms which are transported upwards on the screen surface to slide easily into the bucket. Organisms impinged on the screen surface below this bucket are led into the bucket of the following mesh panel via an opening in the lower panel frame. Due to the special turning system of the mesh panels at the drive unit the fish buckets are gently discharged and the retained water and fish are led into a trough.

  • Geiger® Cable-Operated Cleaner for Bar Screens
    Typically installed in water intake systems as front-end coarse screens or trash rakes. There are stationary and traversing versions available. The traversing version minimizes costs on multi-channel intake designs and optimizes reliability....

  • Passavant®/Geiger® Bar Screens with Cable-Operated Grab Cleaners are typically installed in water intake systems as front-end bar raking machines/coarse screens for bulky debris. Depending on the technical requirements, we have stationary and traversing versions available.

    In industrial plants and numerous other applications, our very robust and operator-friendly machines are used as the first stage when cleaning industrial, process and cooling water. In power plants they protect turbines and other downstream equipment from damage caused by bulky debris or sediments such as sand, gravel and pebbles. Thanks to their automated cleaning technique, Passavant®/Geiger® Cable-Operated Grab Cleaners highly efficiently remove even the most stubborn debris. These machines are not only installed in new civil
    structures; they can also be easily retrofitted into existing water intake systems. In addition to the stationary machines,
    the traversing/moving version of our Bar Screen with Cable-Operated Grab Cleaner for multiple channel cleaning can prove to be
    more economical alternative.


    - Available as stationary or traversing (movable) version
    - Our new innovation-award-winning polyamide cable drums make Geiger® Cable-Operated Grab Cleaners very easy to maintain
    - Two independent drive mechanisms and three cables
    - Intelligent cleaning technique
    - Highly reliable grabbing and removal of bulky debris
    - Highly efficient: One grab cleaner for three or more channels
    - Fully automated cleaning operation with slack rope control (for 3-rope device).
    - High loading capacity of the grab cleaner
    - Different speeds for the cleaner carriage during the descent and cleaning cycle
    - The cleaning cycle can be started from any grab cleaner position
    - Exact limitation of the lifting movement


    Passavant®/Geiger® Cable- Operated Grab Cleaners have two independent drive mechanisms for lifting and pivoting purposes. The
    cleaner carriage with grab cleaner runs on guide ways and is operated using control and hoist ropes.
    These form a unit, meaning that during the clearing cycle the lifting force acts as a lever on the grab cleaner, forcing it to close.
    The grab cleaner’s subsequent powerful closing force enables it to deal with extremely heavy loads and bulky debris.

    The lifting unit controls the descent and the cleaning motions of the Cable-Operated Grab Cleaner.
    The pivoting drive unit controls the entering of the grab cleaner into the bar screen. The slack rope control system detects any blocking
    of the cleaner carriage or grab cleaner caused by floating matter, pebbles, or debris, and will interrupt the grab cleaner’s descent to
    the lower meshing point, hence restarting the cleaning cycle.

    Generally, deposits on the ground and bulky debris are removed layer by layer. In case of clogging or overloading, a special electro-mechanical safety control switches off the machine. This outstanding automated system ensures full operational reliability hence
    enabling high throughput.

    Traversing Cable-Operated Grab Cleaner (Traversing Trash Rake)

    For a multi-line water intake, a Geiger® Traversing Cable-Operated Grab Cleaner or Geiger® Traversing Trash Rake is the more economical alternative to several stationary machines adjacent to each other. Its application area is extremely versatile: due to its exceptional adaptability the Traversing Trash Rake suits a wide variety of situations,
    e. g. in cooling water intakes or hydropower plants.

    Especially in cases where the screenings volume fluctuates, it can be beneficial to clean a number of bar screens using just one Traversing Trash Rake. In this case, it does not matter if the bar screens are adjacent to each other or installed at different places in the civil structure.

    The Traversing Trash Rake’s intelligent control system ensures that all bar screens are reliably cleaned when necessary. Like the stationary
    machine, the Traversing Trash Rake is equipped with the tried-and-tested, large-volume grab cleaner with forced closure.

  • Johnson Offshore Intake Systems™
    Johnson Offshore Intake Systems™ (JOIS™) provide uninterrupted (submerged)
    water withdrawal from lakes, rivers and oceans....

  • With 50 years of intake screen experience and thousands of installations covering a variety of conditions, application engineers
    from Aqseptence Group can provide design and application assistance.

    From shallow rivers to deep oceans from coastal to offshore installations JOIS™ can meet site requirements anywhere in the
    world. JOIS™ comprises two parts: one or more original Johnson Screens® passive intake screen(s) and the corresponding Hydroburst™ air-powered cleaning unit.


    • Highly efficient
    • Custom-designed and engineered
    • Low operating costs
    • Low capital costs
    • Environmentally-friendly:
    • EPA Rule 316b-compliant and also compliant with UK fish protection laws
    • Easy and quick to install
    • Low head loss
    • Proven technology for shallow water resources
    • No waste stream – there is no debris brought to the surface to be handled or disposed of
    • Compact design
    • Fully automated cleaning
    • Submerged and offshore

    Johnson Screens® Passive Intake Screens

    To provide maximum efficiency, Johnson Screens® passive intake screens are designed and engineered to each unique environment,
    resulting in a system which costs less to install, operate and requires less maintenance. Johnson Screens® high capacity passive intake screens are constructed using non-plugging Vee-Wire® with a patented internal dual flow modifier that creates a nearly uniform low flow velocity through the entire screen surface. This significantly reduces impingement and entrainment of debris while protecting aquatic life.
    Passive screens are designed to meet regulatory requirements for a maximum slot velocity for both entrainment and impingement.
    This velocity is typically 0.15 m/s which is the maximum velocity at which a juvenile fish can turn around, swim away and not be
    impinged onto a passive screen but the screens can be designed to the velocity requirements of the application. This, combined with a
    wide range of slot sizes (typically between 2 - 10 mm) determines our screen sizing. Furthermore, the large open area and low velocities
    result in a very low head loss in all applications, providing low overall operating costs.

    Key Features

    • Low capital costs and no moving parts, and low maintenance needs
    • Easy cleaning – with a periodic blast of compressed air using our Hydroburst™ system
    • Non-plugging Vee-Wire® 
    • Three standard configurations – drum, tee and half screens
    • Patented internal dual-flow modifier – provides low and even slot velocity (CFD modelling is available on demand)
    • Selection of materials – from 304 stainless steel for fresh water to Super Duplex for seawater; Z-alloy (CuNi) for repelling zebra mussel attachment and anti-bio fouling in fresh water

    Internal Dual Flow Modifier

    In early development, Johnson looked at modifier designs, which included restrictive pipes using slots and holes, they were rejected due to potential plugging and a very high pressure drop across the screen surface area was experienced.
    The Johnson Screens® passive intake screen systems have an open pipe design that is highly effective, and is based on the industry
    standard. The key component of a Johnson® intake screen system is the patented internal dual flow modifier. The even flow raises the
    overall efficiency of the screen to over 90 percent, which means more compact screen cylinders than with a single pipe modifier.
    The low pressure drop across the screen surface and through the screen body (lower head loss) reduces the amount of energy required to pull water through the screen, creating significant savings on operating costs.

    Half Intake Screens for Shallow Water

    As water demands increase for cities, towns and industry, shallow water resources previously hard to withdraw from due to their lack of
    depth, have become a more viable option. Our patented half screen has all the same attributes (low slot velocity, Hydroburst™ option, Vee-Wire®, dual flow modifier, etc.) as the standard passive intake screens but can operate in a much lower depth of water. Our standard passive screens require approximately half a diameter clearance around the screen. The half screen sits flat on the bottom and only needs the top clearance.


    Aqseptence Group GmbH developed the Hydroburst™ backwash system to ensure a reliable submerged intake system. The Hydroburst™ cleans the Johnson® passive intake screen efficiently from debris using compressed air.
    The process flushes the debris away from the screen surface by releasing an appropriate volume of compressed air through the bottom
    of the screen within a few seconds. The typical backwash procedure cleans each water intake sequentially, at regular intervals.

    Hydroburst™ Air-Backwash System: Mode of Operation

    With time, general debris will gather on the outer screen surface and will need periodic cleaning to keep the screen functioning continuously and properly. Our Hydroburst™ system offers an efficient method of regular cleaning without having to send divers in to
    clean the screens. Our Hydroburst™ system is designed to deliver a sufficient volume of air in 3 - 5 seconds time – a real solid blast of air that has proven to work in a wide variety of types of applications and conditions.
    This volume of air comes out from the bottom of the screen, and as it rises and expands, grabs and carries impinged debris away from
    the screen surface, returning the screen to a clean and efficient operating condition. Our application engineers evaluate screen size,
    depth and distance away in order to deliver the correct amount of air.

    Using a programmable timer system and automated PLC system that is able to communicate to a central data control system / SCADA
    system for control, it is is possible to clean the screens in automatic and/or manual mode.

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