The primary treatment equipment are suitable for industrial and urban sewage treatment.

Primary treatment goal is the reduction of the amount of suspended solids in the sewage by means of different processes such as injecting air flow, adding chemical reagents or adjusting the speed of the sewage. Thus, the particles that are heavier than the water are settled and those particles lighter than water float.

With the primary treatment up to a 90 % of the settleable solids and 65% of the suspended matters are removed and also a drop of 35% of the BOD.


It is one of the most used purification systems for industrial wastewater treatment, because in most cases achieve the limits for discharging the effluents to the collectors and sometimes also those for discharging to riverbeds. The system can works both with and without addition of chemical reagents.

The dissolved air floatation unit -DAF- is an entirely stainless steel made device. It is equipped with a water pressurization kit for the formation of air micro-bubbles of 30 to 50 microns size.

These micro-bubbles stick to the solids particles in the wastewater, forming floating aggregates. The floating solids are drawn by a surface scraper to a discharge gutter. Heavy particles settle in the bottom of the floating unit, like sand particles, being periodically removed by a purge valve.


  • Commonly used as pre-treatment in wastewater treatment plants.
  • In dairy industries, slaughterhouses, canning industry, paper industry, agro-food processing industries, meat and fish processing, etc.



  • Allows the recovery of solids avoiding their loss at the final effluent (for example, cellulosic fibers in paper industry).
  • Commonly, the purification parameter limits for discharging sewage into water collectors are reached thanks to its pollutant removal performance.
  • High level of wastewater treatment. With the addition of chemical reagents, it is possible to achieve a pollutant removal efficiencies of 90% in oils and fats, 85% in suspended solids and 40% in COD.
  • Solids separation is estimated to be up to 5 times faster than in conventional decanters. This means a lower space requirement and a shorter water retention time.
  • The concentration of the separated solids is 8 % higher than in a conventional decantation.
  • Simple installation and minimum maintenance.


The aerated degreaser is a cylindrical device made by stainless steel. The sewage enters into the DAR and its speed is reduced helping the separation of suspended particles.

The degreaser has an AEROFLOT submerged turbine that generates bubbles, which help the solids particles float to the surface.

A rotating two-bladed scraper pulls floating solids into a discharge gutter. Heavy particles settle in the bottom of the degreaser unit, being periodically removed by a purge valve.


  • Economic way for removing fats and oils in industrial sewage.
  • In dairy industries, slaughterhouses, canning industry etc.



  • Simple installation.
  • Low electrical consumption.
  • Does not need chemical reagents.
  • Low operating costs.
  • Minimum maintenance.


The sand classifier separates the sands and heavy sediments from the decanted material in the primary treatments of the wastewater treatment plants.

The sewage with solids gets into the sand classifier, the speed and turbulence are reduced there and the sand is settled.

The solids particles decanted at the bottom are slowly raised by a screw conveyor and dehydrated before being discharged.


  • Sewage treatment plants, either urban or industrial.
  • In paper industry, textile industry, agro-food industry, fruits and vegetables manufacturing industries etc.



  • Flow treatment range from 10 to 130 m3/h
  • Separates particles > 0.2mm
  • With an endless screw without central axis
  • Sand washing ramp for reduction of organic matter in the extracted sand
  • Without internal bearings



  • Recovery of valuable solids not losing them in the final effluent.
  • Dehydration of the decanted material reducing its volume, thus reducing the costs of the final treatment.
  • Simple installation and operation.
  • Minimum maintenance.
  • Without internal bearings

BIDATEK cuenta con planes de mantenimiento, tanto estándar como personalizado, en los que, con el pago de una cuota fija mensual, el cliente puede contratar: Asistencia técnica y mantenimiento preventivo, reparaciones y acciones correctivas, gestión de los lodos generados, suministro de reactivos químicos, análisis en laboratorios homologados, propios o externos, centro de atención telefónica al cliente, formación a operarios del cliente, monitorización e integración de sistemas SCADA, para el control y acceso remoto, gestiones ante las Administraciones.