| 摘要 |
<p>The biological process for the purification of wastewater, comprises sequentially and discontinuously operating a reactor according to a cycle comprising two phases such as a first anaerobic phase and a second aerobic phase. The reactor comprises a first compartment (2) and a second compartment (4) contacting each other in a lower part. The water to be treated arrives in the first compartment. The second compartment contains aerobic granular sludge forming a bed (5), and is present in atmospheric pressure. Oxygen filled gas is injected at a bottom of the second compartment. The biological process for the purification of wastewater, comprises sequentially and discontinuously operating a reactor according to a cycle comprising two phases such as a first anaerobic phase and a second aerobic phase. The reactor comprises a first compartment (2) and a second compartment (4) contacting each other in a lower part. The water to be treated arrives in the first compartment. The second compartment contains aerobic granular sludge forming a bed (5), and is present in atmospheric pressure. Oxygen filled gas is injected at a bottom of the second compartment. During the first anaerobic phase: the first compartment is filled with water by suction; and the pressure of the first compartment is suddenly reduced to the atmospheric pressure to quickly evacuate a volume of water to be treated. The water filling- and pressure reducing operations are repeated to introduce and distribute a sufficient volume of effluent in pulsed mode and in the second compartment. The biological reactions are carried out in an anaerobic medium with the sludge bed that is pulsated and expanded by water force. During the second aerobic phase: the supply of water is stopped; the stopper of a sludge concentrated area is placed in a closed position; an injection of gas such as air containing oxygen takes place in the second compartment; the biological reactions are carried out in an aerobic medium with sludge agitated by gas injection; the gas injection is stopped and the granular sludge to be settled is rapidly removed; the treated water is extracted from the second compartment; and the stopper of the sludge concentrated area is placed in an open position. The aerobic granular sludge is selected by separating the non-agglomerated sludge from concentrated area internal to the second compartment, during the first anaerobic phase. The sludge extracted in the concentrated area is evacuated at the end of second phase. The granular sludge is produced in situ in a phase prior to the effective treatment of the wastewater. The agitation effect is assisted by a mechanical agitation, during the second phase. An independent claim is included for an installation for the purification of wastewater.</p> |
