What is a trickling filter?

Trickling filters are a biological treatment process for effluents (water to be treated) based on the principle of a fixed culture that can be integrated upstream of a rhizofiltration system.
Materials (Crosspack 22) are used as a medium for purifying micro-organisms that form a biological film.
The bacteria in this film purify the wastewater.

Operating principle

Operation of a trickling filter The wastewater enters through the effluent distribution system into the trickling filter, it is then distributed over the bacterial media support (Crosspack 22). The bacterial media support rests on a media support system.

The water flowing over the support systems forms a biological film. The oxygenation by natural or forced ventilation will enable the treatment of the water in particular for dissolved contaminants (carbon and ammonia).

The filter's design will limit the film's thickness by a hydraulic self-cleaning process

Using a trickling filter for the water treatment process

Wood trickling filter The treatment of wastewater with a trickling filter has advantages for wastewater treatment station operators, both in terms of comfort of use and operating costs
  • No nuisances (odours, noise, appearance)
  • Reduced site coverage
  • Modular structure
  • Integration into the natural environment
  • Significant reduction in the amount of slurry
  • Low energy consumption
  • Simple management

Applications of trickling filters

 The principle is the same, trickling filters purify the wastewater in various applications:
  • Treatment of urban effluents (wastewater)
  • Treatment of effluents from the food industry
  • Treatment of industrial effluents

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