HIGH LEVEL SECONDARY TREATMENT (DEP RF)
WITH SLUDGE RETURN
1.FILTER MEDIA: plastic filler éléments with a large surface area that act as a support on which the anaérobie bacteria responsible for treating the effluent can develop.
2.OXYGENATION AREA: area in which the effluent is mixed and oxygenated, thanks to micro-bubble air diffuser plates, powered by an external blower/ compressor. This develops aérobic bacteria that transform the biodégradable compounds into C02. organic nitrogen into ammonia and ammonia into nitrates.
3.FINAL SEDIMENTATION AND DISINFECTION AREA: stilling area in which the residual sludge sédiments and returns once again to the oxygénation section. A housing is présent on the outlet pipe, in which to insert a slow release chlorine tablet. In this way the effluent is disinfected before being discharged.
4.BLOWERS-COMPRESSORS for forced blowing of oxygen into the activated sludge plant and for air-lift recirculation System (included).
5.SLUDGE RECIRCULATION PIPE
TECHNICAL CHARACTERISTICS: Secondary treatments consisting of an anaérobie trickle filter and an activated sludge plant allow almost 100% removal of the organic load and suspended solids with a very high réduction in the nitrogen load and phosphorous load found in domestic sewage. The trickle filter is a biological reactor in which the micro-organisms, under anaérobie conditions, make use of the biodégradable substance contained in the effluent. These micro-organisms develop on the surface of spécial bulk fill material in polypropylene. specifically designed to maximise the contact surface area between the micro-organisms and the effluent.