| 摘要 |
An anoxic reactor including a stirred central reactor (1) into which raw water is fed and in which the biological treatment takes place. The stirred reactor contains a suspension of a low-concentration fixed biomass and comprises at least one stirrer (2) positioned in an internal shaft (3) coaxial with said reactor. The water to be treated flows up or down inside the shaft and down or up, respectively, outside said shaft, with a flow rate selected in such a way that the bioparticles remain in suspension. The reactor further comprises an outlet area (4) extending outside the reactor (1) and communicating with the lower portion (5) thereof. The water treated in the reactor exits said outlet area (4) through the upper portion thereof and flows upwards therethrough with a flow rate selected in such a way that the bioparticle settling rate is higher than the water flow rate, and the settling rate of the excess biomass generated by the biological reactions, particularly a denitrification reaction, is lower than the water flow rate.
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