METHOD FOR THE BIOLOGICAL TREATMENT OF WASTEWATER USING AN AEROBIC GRANULAR BIOMASS

摘要

The invention relates to a method for the biological treatment of wastewater containing pollutants, using an aerobic biomass, said method comprising a plurality of successive cycles of a pre-determined length in order to obtain pollutant removal efficiency greater than or equal to 90%, each of said cycles comprising the following steps consisting in: introducing a wastewater effluent containing phosphorus and calcium into a reactor containing the biomass, applying an aerobic phase by introducing into the reactor a gas flow containing oxygen for a pre-determined length of time sufficient to form aerobic biomass granules, decanting the thus formed aerobic biomass granules, and removing at least part of the treated effluent. After each of the steps comprising the introduction of effluent into the reactor, the pH in the reactor is maintained at a value above 8 for a length of time at least equal to 10% of the cycle length.