Process, installation and reactor for biological treatment of waste water

A process for biological waste water treatment comprising:

• a) a providing a three phase submersive reactor comprising a reactor vessel;
• a division device dividing the inside of the reactor vessel into a first compartment with an anaerobic environment and a second compartment with anoxic and aerobic environments;
• a submerged and slowly rotating biodisk which crosses through the division device so as to extend into both compartments and on which a first chemoorganotrophic biocenosis is settled;
• and an aerator located in the upper portion of the second compartment;
• b) treating incoming raw waste water in the first compartment;
• c) discharging the treated solution from the upper portion of the first compartment;
• d) nitrification of the treated solution using a second chemolithotrophic biocenosis in a nitrification stage with an aerobic environment;
• e) treating the nitrified solution in the second compartment providing;
• e) denitrification in the anoxic environment and aerobic treatment in the aerobic environment;
• f);
• discharging the cleaned waste water from the upper portion of the second compartment.