Facility and method for biologically treating organic waste and effluents

A method for implementing an organic waste treatment facility, the method comprising:

• providing a first tank that includes a first separation device extending over a portion of the height of the first tank to define a first central compartment, a first peripheral compartment, a first stirring and biochemical exchange compartment having a first stirring device arranged at a bottom portion of the first tank, and which is to facilitate stirring and biochemical exchanges, and provide a fluidic communication between the first central compartment and the first peripheral compartment, and a second tank that includes a second separation device extending over a portion of the height of the second tank to define a second central compartment, a second peripheral compartment, and a second stirring and biochemical exchange compartment having a second stirring device arranged at a bottom portion of the second tank, and which is to facilitate stirring and biochemical exchanges, and provide a fluidic communication between the second central compartment and the second peripheral compartment;
• admitting organic waste to be treated into the first tank;
• conducting, at least partially, a hydrolysis process in the first peripheral compartment and, at least partially, an acidogenesis process in the first central compartment;
• transferring the partially treated organic waste from the first central compartment to a second peripheral compartment;
• conducting, at least partially, an acetogenesis process in the second peripheral compartment and, at least partially, a methanogenesis process in the second central compartment;
• and
• discharging the treated organic waste from the second central compartment.

A facility for treating organic waste to produce biogas and recover at least one portion of the biogas produced, the facility comprising:

• a first tank including:
• a first separation device defining a first central compartment, a first peripheral compartment that is closed at an upper portion thereof, and a first stirring and biochemical exchange compartment having a first stirring device which is to facilitate stirring and biochemical exchanges in the first tank, the first stirring and biochemical exchange compartment to exclusively provide a fluidic communication between the first central compartment and the first peripheral compartment at a bottom portion of the first tank,
• a second tank including:
• a second separation device defining a second central compartment, a second peripheral compartment that is closed at an upper portion thereof, and a second stirring and biochemical exchange compartment having a second stirring device which is to facilitate stirring and biochemical exchanges in the second tank, the second stirring and biochemical exchange compartment to exclusively provide a fluidic communication between the second central compartment and the second peripheral compartment, and
• a supply line to feed the organic waste into the first peripheral compartment;
• a transfer line to transfer partially treated organic waste from the first central compartment to the second peripheral compartment in a manner that the first central compartment communicates at the upper portion thereof exclusively with a top of the second central compartment;
• a discharge line to discharge the treated organic waste from the second central compartment;
• and
• a pressure tank and at least one circulating gas line, in fluidic communication with the pressure tank, to circulate the organic waste by pneumatic force from the first peripheral compartment to the second central compartment;
• the at least one circulating gas line including:
• a first circulation gas line and a second opening into the upper portion of the first peripheral compartment to facilitate creation of a pressure in a gas blanket of the first peripheral compartment which causes to rise of a volume of organic substrate in the first central compartment by pneumatic force that corresponds to a volume of incoming organic waste, and
• a second circulation gas line opening into the upper portion of the second peripheral compartment to facilitate discharge by pneumatic force of a volume of digestates corresponding to a volume of incoming organic waste from the second central compartment;
• wherein the organic waste to be treated is transferred in succession from a first volume formed by the first peripheral compartment, then to a second volume formed by the first central compartment, then to a third volume formed by the second peripheral compartment, then to a fourth volume formed by the second peripheral compartment, before being discharged by pneumatic force from the second tank.