Products for the water treatment

Primary treatments

To reduce the material in suspension efficiently and to improve the purification performance of wastewater treatment and the quality of the purified water, Salher designs and manufactures advanced primary treatments such as Vespa DAF or Lamellar Settler

Vespa, Dissolved Air Flotator (DAF)

Lamellar Settler

Dissolved Air Flotator (DAF)

Salher designs and manufactures the Vespa dissolved air flotation unit to separate  suspended solids, grease and oils from wastewater. The dissolved air flotation system separates the particles in suspension by air microbubbles in a supersaturated concentration. The solids adhere to the microbubbles in their upwards floating path towards the scraping system. The performance of the equipment is 50-80% BOD5 elimination, 60-80% COD elimination and 90% suspended solids, oils and grease.

Vespa is a fully modular and compact equipment, with adaptable layouts and deliverable worldwide, since it fits in international standard maritime containers.


The main feature of this DAF, compared to others available on the market, is the cylindrical design of its custom-made float; this means that its height can be designed to adapt to the needs of each client. In addition to this, it has a leveling system with adjustable legs for uneven grounds.

This DAF is manufactured by Filament Winding system with an innovative material, a GFRP that combines isophthalic resins with basalt fiber, materials that prevent from corrosion and protect from UV radiation, providing the equipment with a total chemical and mechanical resistance to any type of adverse situation.

All its metallic elements are made of AISI 316 stainless steel: a skimmer for floating collection, an adjustable scraper system and a clarified water collector adjustable in height that allows the equipment to adapt easily to changes in incoming water loads.

This flotator has a methacrylate transparent cover in its upper part which reduces the odors generated by the process, facilitating the visual inspection of the inner part and the maintenance tasks.

As control elements, Vespa has a butterfly valve with pneumatic actuator for the automatic purge of the equipment, a conductive probe of rods installed in the clarified water chamber for the control of the level of operation.

Its recirculated water pressurization system is composed of a centrifuge pressurization pump, a pressure transmitter in the pump drive, a venturi injector where the first water-air mixture is produced, a pressurization tank with pressure measurement and a pre-installed valve kit, pneumatically actuated diaphragm pressurization valves and a pneumatic control box composed of regulating filter (0-8.5 bar), pressure regulator (0-8.5 bar), flow switch and a set of control electrovalves.

The equipment has all the manual valves necessary for the correct operation of the system and safety elements for emergency stop.

Pipe floculator

The equipment, reference FLC, is the ideal complement for the dissolved air flotation system, Salher brand, reference VESPA, and also for the lamellar settler, reference DE-LA. Its long retention time allows the coagulation and flocculation processes develop under optimal conditions, which greatly increases its yields. The system incorporates in-line inserts for the preparation and control of the flocculation process.

 The Salher flocculation system consists of a pipe system made of thermo-welded polyethylene, an internal frame in steel with anti-corrosion paint category C5-M (degree of marine protection), a height regulation and leveling system, sample taking taps, a coagulant and soda injection intake and another flocculation injection intake.

Automatic Polyelectrolyte Preparation Unit

(see UAP reference, sludge and thickener treatments). 

The automatic preparation unit of compact Polyelectrolyte, Salher brand, allows the preparation, maturation and dosing of the polyelectrolyte solution continuously and automatically.

Coagulation/flocculation system

Composed of coagulant dosing pump, coagulant injection kit, 500L reagent storage tank in HDPE, flocculant dosing pump and flocculant injection kit.

PH control and regulation system

It consists of a pH measurement probe with control unit for process automation, a soda dosing pump, a reagent injection kit and a 500L reagent storage tank in PEHD.

Electrical panel board

The system is supplied fully automated by means of a SIEMENS S7 1200 PLC with a 7 “color touchscreen.  The programming of the panel and the dynamic interface of the different screens facilitate the understanding and correct use by the plant operators.


  • Lamellar settler.

  • Settling-digestion equipment, such as vertical and horizontal septic tanks and the Imhoff tank.

  • Closed or open solids truncated cone shape settlers.


Lamellar Settler

The DE-LA lamellar, Salher brand, is a device designed for the continuous settling of suspended sediments transported by wastewater for flows comprised between 5 a 100m3/hour. By installing lamellar modules in the sedimentation chamber, it is possible to increase the effective surface area of settling, which allows to increase the performance of the settler and significantly decreases the surface area of ​​the tanks producing more compact equipment with a greater efficiency. The lamellar settler is an internally demountable equipment to facilitate the extraction of the lamellar set.

This system has applications in both wastewater and water treatment plants:

  • Drinking water clarifier.
  • Grey water treatment.
  • Settling of surface and underground water.
  • Tertiary treatment.
  • Fish farms.
  • Salting.

The internal part of the equipment or tank is manufactured in GFRP and the external is in carbon steel with protection against corrosion, although it can also be manufactured in stainless steel AISI 304 or AISI 316. The lamellar set is made of PVC with a 60º slope. The equipment also has a top collection dump for the collection of clarified water, an inlet, outlet and overflow with flanged outlet and a ball valve installed in the outlet.


Septic tanks

The Salher septic tanks are equipment for the removal of suspended solids in settling-digestion manufactured in glass fiber reinforced polyester with orthophtalic resins according to EN-12255-4. There are different types according to their arrangement: small vertical CVC-FS and horizontal CHC-FS.

The Imhoff tank CHC-IMH, Salher brand, is a settling-digestion equipment made of glass fiber reinforced polyester with orthophthalic resins according to EN-12255-4, which is used for the removal of suspended solids, with yields of 70 to 75%, and yields of 35 to 40% in the elimination of organic matter. This equipment includes a longitudinal deflector screen.


Truncated cone shape settlers

There are two models of truncated cone shape settlers: the closed solids settling tank CVC-DC-TC and the open solids settler CVA-DC-TC.

Both equipment have a truncated cone shape, they are manufactured by Salher in glass fiber reinforced polyester with orthophtalic resins for underground installation and they are used for the elimination of suspended solids.

The closed model has an intake in the manhole to install a ventilation pipe.

Further information:

Check any general or specific questions about these or other equipment and solutions to our engineers.

Salher Products

Hydrocarbon separators

Drinking water

  • Treatment plants by filtration.
  • Treatment plants by ultrafiltration.
  • Reverse osmosis plant.
  • Desinfection systems.

Sludge treatments

Primary treatments

  • Dissolved Air Flotator Vespa.
  • Settlers.

Secondary treatments

  • WWTP by activated sludge.
  • WWTP by moving bed biofilm reactor (MBBR).
  • WWTP by biomembranes (MBR).
  • WWTP by trickling filter.
  • Specific WWTP.

Tertiary treatments


  • Screening systems.
  • Grit chambers and grease separators.

Pumping stations


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Engineering – Wastewater treatment – Purification – Liquid/solids separation equipment for industrial and municipal process applications – Surface water – Groundwater – Water Reuse – Drinking Water – Hydrocarbon and Oil Water Separation

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