Navigation : EXPO21XX > PROCESS INDUSTRY 21XX > H22: Recycling and Waste Management > Pumpenfabrik Wangen
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  • Offer Profile
  • Pumps from WANGEN PUMPEN are highly regarded at regional, national and international level thanks to our consistent orientation to market and customer requirements. It is this high esteem in which we are held by our customers that motivates us to preserve, improve and breathe new life into our values day after day.

    Whether you need to handle adhesive, abrasive or crumbly material, or require absolute hygiene in food, agriculture, biogas or chemicals: This is when our pumps are at their very best. WANGEN pumps combine extremely high resistancy and reliability with long life expectancy.The resulting low life cycle costs save both cash and nerves.

Product Portfolio
  • Progressing cavity pump

  • Pure power: Due to the use of cardan joint in our progressing cavity pumps, a key advantage of our philosophy is clear here: Wangen pumps guarantee low-maintenance operation which is practically fault-free. For this reason, we only use top-quality and robust components.
      • Self-priming pumps

      • Quality characteristics of the WANGEN self-priming pumps are gentle pumping, a virtually gap and crevice-free design, high availability and little maintenance. Besides all-purpose pump series we offer special pumps for conveying food, who could be EHEDG certified.
          • Type A

          • Benefits and Characteristics

            • Low Life Cycle Costs
            • High operational reliability
            • High priming capacity
            • High pressure performance
            • No foreign body deposits in the suction housing
            • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
            • Almost pulsation-free conveyance
            • Easy fitting to slurry tankers or trolleys
            • Smooth running thanks to hollow rotors
            • Insensitive to foreign matter
            • Maintenance-friendly
            • Easy, space-saving assembly
            • Good pumping performance even against high pressure
            • High suction lift (self-priming under certain conditions)
            • Long service life
            • Multi-way slide valve installed in the suction housing, can be operated by hand lever
            • No tangling up of fibers
          • Type GL-F

          • The WANGEN processing cavity pump of type GL-F is compactly built. It can be used to achieve high conveyance volumes and counter pressures. Attached to tank trailers, slurry tankers and umbilical hose systems, it is equally suited for mediums with different properties, such as fluid or slow-moving, mash-like, or loaded with solids.

            Benefits and Characteristics

            • No tangling of fibers around the joint or joint connections
            • Optionally with stone catcher
            • Pump delivery over long distances and large differences in height
            • Low Life Cycle Costs
            • High operational reliability
            • High priming capacity
            • Long service life
            • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
            • Low servicing costs
            • Low-pulsation, continuous conveyance independent of pressure and viscosity
            • Smooth running thanks to hollow rotors
            • Insensitive to foreign matter
            • Maintenance-friendly
            • Easy fitting to slurry tankers or trolleys
            • Compact construction based on modular principle for high flexibility
            • High suction lift (self-priming under certain conditions)
            • High pressure performance
            • Almost pulsation-free conveyance
            • Good pumping performance even with abrasive and fibrous materials in the media
          • Type GL-S

          • Benefits and Characteristics

            • Low Life Cycle Costs
            • High operational reliability
            • High priming capacity
            • Long service life
            • Good pumping performance even against high pressure
            • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
            • Almost pulsation-free conveyance
            • Easy fitting to slurry tankers or trolleys
            • Smooth running thanks to hollow rotors
            • Insensitive to foreign matter
            • Easy to maintain thanks to large cleaning openings
            • High pressure performance
            • High suction lift (self-priming under certain conditions)
            • Consistant diameters at joint connections for constant flow rates
            • No foreign body deposits in the suction housing
            • No tangling of fibers around the joint or joint connections
            • Rigorous modular principle for high flexibility
            • Optimum service life even with difficult media
          • Type KB-S GG

          • Benefits and Characteristics

            • Low Life Cycle Costs
            • Excellent price/performance ratio
            • High pressure performance
            • Maintenance-friendly
            • Good price/performance ratio (standard product group)
            • Optionally with base plate or mobile
            • Good dosing properties
            • Constant flow speed in the suction housing prevents desposits or sedimentation
            • Rigorous modular principle for high flexibility
            • Compact design
            • High suction lift (self-priming under certain conditions)
          • Type KL-S

          • Benefits and Characteristics

            • Excellent price/performance ratio
            • Low Life Cycle Costs
            • Large viscosity range
            • Good pumping performance even against high pressure
            • High operational reliability
            • Consistant diameters at joint connections for constant flow rates
            • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
            • Almost pulsation-free conveyance
            • Optimum service life even with difficult media
            • Optionally with base plate
            • Insensitive to foreign matter
            • Good pumping performance even with abrasive and fibrous materials in the media
            • High suction lift (self-priming under certain conditions)
            • Constant flow speed in the suction housing prevents desposits or sedimentation
            • Low-pulsation, continuous conveyance independent of pressure and viscosity
            • Easy to maintain thanks to large cleaning openings
          • Type WANGEN KB10S / KB22S

          • The WANGEN KB10S / KB22S has been developed especially for conveying and dosing in waste water treatment plants. Available in the pump size 10 (with housing in plastic material) and 22 (with housing in cast iron).

            Benefits and Characteristics

            • Housing available in plastic material or cast iron
            • Flexible joint without oil filling (prevents contamination of the media)
            • Large dosing range
            • Dosing accuracy ± 1%
            • Intelligent design
          • Type WANGEN Xpress

          • The changing of wear parts with very few actions, without removing the pump from the pipeline system thanks to Service in Place.
            The Xpress pump range has been specially developed for easy maintenance and to considerably shorten the servicing time and thus reduce costs. Reliable pumping of media, along with fast rotor/stator changes are ensured by the X-LIFT quick change system developed by WANGEN PUMPEN. The X-LIFT flange is constructed on standard flange design principles.

            Benefits and Characteristics

            • The pump remains in the system when changing rotor/stator, thus considerably reducing the amount of installation work
            • Changing the complete drive section of the WANGEN Xpress can be carried out using 4 standard tools, quickly and easily
            • Quick change of shaft seal
            • Excellent price/performance ratio
            • Low Life Cycle Costs
            • Low servicing costs
          • Type WANGEN BIO-FEED

          • WANGEN PUMPEN's developed BIO-FEED is designed especially for machines that would like to combine existing screw technology at the substrate storage container with the feeding of liquids.
            With a specially-developed milling screw, you can mix the solids that are to be added with the
            separately added liquid and convey it into the desired containers.

            With our innovative X-LIFT quick-change system, the wearing parts are easy to replace. Only a few simple steps are needed, without this requiring disassembly of the pump from the piping system. Thereby, WANGEN BIO-FEED is also suitable as a pump in biogas-plants for use in restricted spaces.

            Benefits and Characteristics

            • X-LIFT quick change system
            • Large-scale mixing chamber
            • Specially-developed joint with milling screw
            • Liquid addition and high-performance central pump
            • Unproblematic liquid feeding with wet and watery solids, without additional liquid
            • Liquid feeding pump for connection to existing screw technology
            • Low Life Cycle Costs
            • The pump remains in the system when changing rotor/stator, thus considerably reducing the amount of installation work
            • fast rotor/stator changes
            • Maintenance-friendly
        • Hopper feed pump

        • No matter, what you throw in: WANGEN hopper feed pumps impresses with high flow rates, even when handling abrasive or fibrous additives. Our pumps achieve peak levels when it comes to powerful and robust dosing and conveying.
            • Type KL-R

            • Benefits and Characteristics

              • Pump delivery over long distances and large differences in height
              • Low Life Cycle Costs
              • Large viscosity range
              • Good pumping performance even against high pressure
              • High operational reliability
              • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
              • Low servicing costs
              • Optimum service life even with difficult media
              • Insensitive to foreign matter
              • Good pumping performance even with abrasive and fibrous materials in the media
              • Optional heating or cooling jackets
              • Optionally with base plate or mobile
              • Various hopper sizes available
              • Modular design for high flexibility and short downtimes for maintenance and repairs
            • Type KL-RQ

            • Benefits and Characteristics

              • Buffer volume up to 10 m³ possible
              • Low Life Cycle Costs
              • Good pumping performance even against high pressure
              • High dosing accuracy, also at low speed
              • High pressure performance
              • Optimum service life even with difficult media
              • Low-pulsation, continuous conveyance independent of pressure and viscosity
              • Easy to maintain thanks to large cleaning openings
              • Excellent metering, important for dryer and incinerator operation
              • Unattended operation possible
              • Constant metering because the discontinuous input is compensated by buffer volume in the collecting container
              • Little space required, with large collecting container
              • Modular design for high flexibility and short downtimes for maintenance and repairs
              • Low construction with large container volume
            • Type KL-RS

            • Benefits and Characteristics

              • Excellent price/performance ratio
              • Low Life Cycle Costs
              • Large viscosity range
              • Good pumping performance even with abrasive and fibrous materials in the media
              • High operational reliability
              • High pressure performance
              • Long service life
              • Configuration and length according to the customer's wishes
              • Modular design for high flexibility and short downtimes for maintenance and repairs
              • Almost pulsation-free conveyance
              • Low servicing costs
              • Optimum service life even with difficult media
              • Various hopper sizes available
              • Robust bearing pedestal with close-coupled drive and self-centering of the drive shaft (optionally with bare shaft)
              • Insensitive to foreign matter
              • Maintenance-friendly
              • Modular design for short downtimes
              • Direct flange-fitting of the pump to the bottom of the silo
              • Double, maintenance-free shaft seal
              • Rotor/stator quick-change facility
              • Slide valves at the end of the hopper tunnel enable inspection and monitoring work to be carried out without having to dismantle the pump
              • Split frame design for installation in confined conditions
              • Shut-off slide valves enable changes of rotor/stator when the silo is full
            • Type WANGEN BIO-MIX

            • WANGEN BIO-MIX pumps have been integrated for many years in the energy production process and undergone continuous further development and optimization. They are suitable for conveying maize silage, grass silage, GPS, solid manure, poultry dung, waste and co-ferments, which are mixed with liquid in the pump.

              Benefits and Characteristics

              • Excellent price/performance ratio
              • Large viscosity range
              • Good pumping performance even with abrasive and fibrous materials in the media
              • Good pumping performance even against high pressure
              • High operational reliability
              • Long service life
              • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
              • Low servicing costs
              • Optimum service life even with difficult media
              • Easy to maintain thanks to large cleaning openings
              • Optionally with base plate
              • Insensitive to foreign matter
              • Several fermenters can be filled with one feeding system
              • Low Life Cycle Costs
              • Various hopper sizes available, including wear protection
              • Modular design for high flexibility
              • Pump delivery over long distances and large differences in height
            • Type KL-R Triplex

            • Benefits and Characteristics

              • Buffer volume up to 10 m³ possible
              • Modular design for high flexibility and short downtimes for maintenance and repairs
              • Constant metering because the discontinuous input is compensated by buffer volume in the collecting container
              • Unattended operation possible
              • Excellent metering, important for dryer and incinerator operation
              • Easy to maintain thanks to large cleaning openings
              • Low-pulsation, continuous conveyance independent of pressure and viscosity
              • Optimum service life even with difficult media
              • High operational reliability
              • High pressure performance
              • High dosing accuracy, also at low speed
              • Low Life Cycle Costs
              • Low construction with large container volume
              • Little space required, with large collecting container
            • Type KL-RUE

            • Benefits and Characteristics

              • Maintenance-friendly
              • Robust bearing pedestal with close-coupled drive and self-centering of the drive shaft (optionally with bare shaft)
              • Various hopper sizes available
              • Low-pulsation, continuous conveyance independent of pressure and viscosity
              • Gentle pumping
              • Modular design for high flexibility and short downtimes for maintenance and repairs
              • Almost pulsation-free conveyance
              • Modular design for short downtimes
              • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
              • Compact construction based on modular principle for high flexibility
              • No tangling of fibers around the joint or joint connections
              • Long service life
              • High pressure performance
              • High dosing accuracy, also at low speed
              • High operational reliability
              • Good price/performance ratio (standard product group)
              • Good pumping performance even with abrasive and fibrous materials in the media
              • Large viscosity range
              • Constant metering because the discontinuous input is compensated by buffer volume in the collecting container
              • Low Life Cycle Costs
              • Unattended operation possible
              • Excellent metering, important for dryer and incinerator operation
          • Immersion pump

          • With our immersion pump we get to the bottom of the object. And we do it with an in-depth carefulness, that leaves only a minimum of residues. Intertank transfer, draining, filling up or purging: the conveyed media are handled gently and without impairment of their structure and quality.
                • Type KL-T

                • Benefits and Characteristics

                  • Low Life Cycle Costs
                  • Large viscosity range
                  • Consistant diameters at joint connections for constant flow rates
                  • Insensitive to foreign matter
                  • Excellent price/performance ratio
                  • High dosing accuracy, also at low speed
                  • Little space required thanks to vertical design
                  • High operational reliability
                  • High suction lift (self-priming under certain conditions)
                  • Configuration and length according to the customer's wishes
                  • Rigorous modular principle simplifies the handling of spare parts
                  • Low-pulsation, continuous conveyance independent of pressure and viscosity
                  • Maintenance-friendly
            • Hygienic progressing cavity pumps

            • Our hygienic progressing cavity pumps are a further development of the pump series for the food industry. In the area in contact with the product their ground, electropolished high-grade steel have partly a surface roughness of RA < 0.8 μm. Other quality characteristics are gentle pumping, a virtually gap and crevice-free design, high availability and little maintenance.
                • Type KB-SL Hygienic

                • Benefits and Characteristics

                  • Low Life Cycle Costs
                  • Excellent price/performance ratio
                  • Large viscosity range
                  • High operational reliability
                  • High dosing accuracy, also at low speed
                  • High priming capacity
                  • Long service life
                  • Compact construction based on modular principle for high flexibility
                  • Rigorous modular principle simplifies the handling of spare parts
                  • Optionally with base plate
                  • Low servicing costs
                  • Compact design avoids dead space and stagnant zones
                  • Excellent dosing accuracy
                  • EHEDG certified
                  • High suction lift (self-priming under certain conditions)
                  • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
                  • Optionally with base plate or mobile
                  • Gentle pumping
                  • Special versions available for adapting to existing plants
                  • Optionally with one or two tangentially inclined cleaning connections
                • Type KL-SL Hygienic

                • Benefits and Characteristics

                  • Maintenance-friendly
                  • Optionally with one or two tangentially inclined cleaning connections
                  • Can run dry
                  • Top results for SIP and CIP cleaning
                  • Robust bearing pedestal with close-coupled drive and self-centering of the drive shaft (optionally with bare shaft)
                  • Low-pulsation, continuous conveyance independent of pressure and viscosity
                  • Gentle pumping
                  • Optionally with base plate or mobile
                  • Optional heating or cooling jackets
                  • Low servicing costs
                  • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
                  • Compact construction based on modular principle for high flexibility
                  • Compact design avoids dead space and stagnant zones
                  • Consistant diameters at joint connections for constant flow rates
                  • High suction lift (self-priming under certain conditions)
                  • High pressure performance
                  • High dosing accuracy, also at low speed
                  • High operational reliability
                  • Large viscosity range
                  • Low Life Cycle Costs
                  • Easy, space-saving assembly
                  • EHEDG certified
                  • Double, maintenance-free shaft seal
                  • Pump delivery over long distances and large differences in height
                  • Unattended operation possible
                  • Excellent price/performance ratio
                  • Excellent dosing accuracy
                • Type KL-RL Hygienic

                • Benefits and Characteristics

                  • Easy to maintain thanks to large cleaning openings
                  • Optionally with one or two tangentially inclined cleaning connections
                  • Gentle pumping
                  • Optional heating or cooling jackets
                  • Low servicing costs
                  • Almost pulsation-free conveyance
                  • Modular design for high flexibility and short downtimes for maintenance and repairs
                  • Rigorous modular principle simplifies the handling of spare parts
                  • Compact design avoids dead space and stagnant zones
                  • Long service life
                  • Good price/performance ratio (standard product group)
                  • Large viscosity range
                  • Low Life Cycle Costs
                  • Easy, space-saving assembly
                  • Quick and easy manual cleaning
                  • Unattended operation possible
                • Type KL-RF Hygienic

                • Benefits and Characteristics

                  • Maintenance-friendly
                  • rational and functional design
                  • Gentle pumping
                  • Optional heating or cooling jackets
                  • Compact design
                  • Long service life
                  • Low Life Cycle Costs
                  • Easy, space-saving assembly
                  • Quick and easy manual cleaning
                  • Excellent price/performance ratio
                • Type HYLINE

                • The hygienic-related design of the WANGEN HYLINE was implemented according to the strict GMP (Good Manufacturing Practice) directives.

                  Hygienic Highlight: The flexible and maintenance-free joint is coated with elastomer. A constant shaft diameter construction design prevents sedimentation of the media to be pumped.

                  In order to enable the conveyance of a wide spectrum of media, a large selection of single-acting and double-acting shaft seals are available for the HYLINE, such as the encapsulated seals, single acting seal with elastomer bellows or gland packing.

                  The intelligent design of this hygienic pump requires no additional seals in the product chamber. Pump disassembly is easily carried out by removing all pump component connections outside the product chamber.

                  Benefits and Characteristics

                  • Excellent dosing accuracy
                  • Low dead space design of the pump interior
                  • Intelligent design
              • Hygienic twin screw pumps

              • Twins are a boon. This is also the case with our WANGEN Twin, which achieves top results for SIP and CIP cleaning. Due to its high rpm range the Wangen Twin screw pump can be used for both, pumping and cleaning.
                  • Type WANGEN Twin NG

                  • The new generation of the WANGEN Twin NG screw pump is part of the hygienic pumping solutions from WANGEN and was designed to reliably pump low to highly viscous, volatile or gaseous products and for applications where maximum hygiene and efficiency is required.The hygienic pump for food and beverages, chemicals and cosmetics.
                    Spindle change without re-synchronisation of the spindle shafts, enabled by WANGEN PUMPEN's fast-X-change® technology.
                    Seal change simple and fast as a result of cartridge construction design.

                    Alignment of the coupling by a self-centring flange housing (lantern optionally available). As a result, no re-alignment of the coupling is needed, e.g. after service activities.

                    Benefits and Characteristics

                    • Excellent price/performance ratio
                    • Low Life Cycle Costs
                    • High suction lift (self-priming)
                    • High operational reliability
                    • Compact design
                    • Compact design avoids dead space and stagnant zones
                    • Rigorous modular principle for high flexibility, low stocking of spare parts, short downtimes for maintenance and repairs
                    • Almost pulsation-free conveyance
                    • Optional heating or cooling jackets
                    • Optionally with base plate or mobile
                    • Gentle pumping
                    • Special versions available for adapting to existing plants
                    • Maintenance-friendly
                    • Quick and easy manual cleaning
                    • Eliminates the need for a separate centrifugal pump for CIP cleaning
                    • Large viscosity range
                    • High priming capacity
                    • Low servicing costs
                    • Top results for SIP and CIP cleaning
                    • Can run dry
                  • Type WANGEN VarioTwin

                  • Gently feeding high-viscosity media: The WANGEN VarioTwin is an hygienic and patented add-on module to the WANGEN Twin screw pump, with hopper and screw conveyor.

                    Benefits and Characteristics

                    • ‘Coreless' screw for gentle product treatment of media.
                    • Hygiene-optimised design; therefore, minimal dead spaces.
                    • Cantilevered support system of the screw for maximum hygiene with minimal residues
                    • Low space requirement due to compact design.
                    • Drive independently controlled pump speed.
                    • Low energy consumption due to energy-efficient
                    • Materials are FDA-compliant, product-contacting
                • Modules

                      • Type X-UNIT

                      • The modular system for reliable protection of plant equipment:
                        X-TRACT (debris removal) + X-CUT (cutter) = X-UNIT
                        The WANGEN X-UNIT consists of the two modules X-TRACT and X-CUT. Both components are available separately and are optimally co-ordinated with each other as an X-UNIT.

                        Increased process safety through removal of system-harmful foreign bodies and debris with the aid of the foreign body separator X-TRACT and the cutting unit X-CUT. Optimum adaptation of the cutting unit to the medium easily possible.

                        Benefits and Characteristics

                        • process-optimised adaption of the pumped media by simple change of the screen geometrie
                        • flow-optimised catch container
                        • foreign body removal through wheelbarrow possible with mounting stand
                        • additional rinse connections available
                        • no movable component parts necessary for separation of foreign bodies
                        • Optimum adaption of the cutting unit to the media
                        • High operational reliability
                        • Standard flange and compact, space-efficient construction design
                  • Products by application

                  • The ideal pump for your purpose. We help you to find the right product out of our range. Our teams of specialists of course produce individual special-purpose solutions that fits perfectly your requirements. Thereby our decades of expertise becomes your benefit.

                    We offer - besides our complete range of standard pumps - cutomized pumps designed and manufactured for specific purposes. WANGEN pumps feature a high level of quality and operational reliability. They are used successfully in the field of biogas technology, agriculture, food and drink industry or by municipalities, whereever there is a need for reliable conveyance of highly viscous or abrasive substances.
                      • AGRICULTURE

                      • Since it was founded in 1969, Pumpenfabrik Wangen has been developing and manufacturing progressing cavity pumps for various agricultural applications, e.g. liquid manure transport, liquid manure distribution and liquid feed. This experience has a beneficial impact on the quality of our products and therefore on the success of our customers: WANGEN pumps have a long service life, are characterized by rugged design, and perform reliably even in the most difficult conditions.
                      • BIOGAS

                      • Fossil fuels are becoming scarce. Renewable energies are gaining in importance. And the same applies to biogas technology. Ever since it was founded, Pumpenfabrik Wangen has been manufacturing progressing cavity pumps for this branch of technology and has been a member of the German Biogas Association.
                      • Waste water and sewage systems, environmental engineering

                      • More and more, water is becoming a valuable resource. Service water and waste water must therefore be cleaned in modern drinking water and waster water treatment plants with the help of complex processes – in successive mechanical, biological and chemical stages – and then returned to the ecological cycle. Pumpenfabrik Wangen offers pumps in many different series for conveying the sludge formed in the course of these water treatment stages.
                      • Food and drinks industry

                      • WANGEN pumps convey products with little stress, permit the processing of even the smallest residual quantities, and come in CIP or SIP versions – a must in this industry – for easy cleaning.

                        The highest standards of hygiene are satisfied by our pump series with EHEDG approval.
                      • Chemicals and paper

                      • WANGEN pumps are designed in terms of setup, materials and specifically defined performance parameters to meet exactly the requirements of the pumping duty – this is an ideal response to many sophisticated applications in the chemical industry and the paper industry.
                      • Shipbuilding

                      • When pumps are to be used on ships, their design and construction materials must always be viewed with regard to maximum reliability and safety. WANGEN pumps satisfy marine standards and can be issued on request with a DNV certificate. They can be installed in vertical or horizontal position, suffer little wear, and have low failure rates. Wearing parts are easy to replace.

                        Examples of use:
                        • Sludge
                        • bilge water (condensate collecting in the keel)
                        • oil and fuel residues
                        • supplying the oil separator
                        • conveying waste water and refuse from the galley and sanitary facilities
                      • Pharmaceuticals and cosmetics

                      • The production of pharmaceuticals and cosmetics is subject to strict rules. In collaboration with our customers we have designed a series of pumps which fulfill the requirements and have EHEDG approval. Of cause we use FDA-approved materials.

                        Pharmaceuticals and cosmetics
                        Features include flow-optimized housings, near-pulsation-free conveyance of media, high dosing accuracy, use of FDA-approved materials, and little dead space for easy cleaning. All in all, WANGEN pumps ensure the highest standards of production for their users.
                      • Mining and tunnel construction

                      • Stones, earth, mining, tunnel construction, geothermics, building materials: These are areas in which pumps face the toughest tasks and must cope with hard, abrasive loads. With their stability and application-specific designs, WANGEN pumps ensure economic efficiency even in these areas.

                        Examples of media conveyed:

                        In tunnel construction:
                        e.g. bentonite suspensions, quick-binding cement-sand suspensions, polymers as lubricants on tunnel driving equipment

                        In geothermics:
                        e.g. bentonite fillers

                        In gravel works:
                        e.g. gravel washing sludge

                        In the building materials industry:
                        e.g. plaster sludge

                        In mining:
                        e.g. coal floatation sludge