High dissolved oxygen mixer-digester method
OwnerGerhardt Van Drieinventor
Life of this patent
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Abstract
A sludge digesting method uses a mixing tank providing an integral ceiling, interior wall surface and a floor surface. A vertical beam supports a mixing device engaged for movement along the vertical beam. A plurality of sparger jets protrudes from the wall surface for delivering an oxygen gas flow directly into the interior of the sludge. A second plurality of sparger jets terminates at the mixing tank floor surface for delivering oxygen gas into the mixing tank and a plurality of bubbling diffusers in a circle ⅔ of the diameter of the tank protrudes upwardly from the floor surface for delivering further oxygen gas flow into the mixing tank. The method provides for mixing and entraining oxygen into a process sludge, in an amount of between 4-45 ppm, to accelerate digestion as a batch or continuous process.
Claims4
A method for improving digestion rates in a sludge digester which comprises:
- filling a mixing tank with an undigested sludge;
- mixing the sludge with a mechanical mixer;
- forcing oxygen gas under pressure through a plurality of sparger jets protruding from a wall surface of the mixing tank into the interior of the sludge, said jets covering at least 70% of the wall surface;
- bubbling oxygen gas under pressure from a plurality of bubbling diffusers, located in a floor of the mixing tank in a circle approximately ⅔ of the diameter of the mixing tank, into the sludge;
- and draining the mixing tank when the sludge has been digested as a batch process.
A method for improving digestion rates in a sludge digester which comprises:
- filling a mixing tank with an undigested sludge;
- mixing the sludge with a mechanical mixer;
- forcing oxygen gas under pressure through a plurality of sparger jets protruding from a wall surface of the mixing tank into the interior of the sludge, said jets covering at least 70% of the wall surface;
- bubbling oxygen gas under pressure from a plurality of bubbling diffusers, located in a floor of the mixing tank in a circle approximately ⅔ of the diameter of the mixing tank, into the sludge;
- and draining processed sludge and introducing new sludge into the mixing tank continuously as a continuous process.
A method for improving digestion rates in a sludge digester which comprises:
- filling a mixing tank with an undigested sludge;
- mixing the sludge with a mechanical mixer;
- forcing oxygen gas under pressure through a plurality of sparger jets protruding from a wall surface of the mixing tank into the interior of the sludge, said jets covering at least 70% of the wall surface;
- bubbling oxygen gas under pressure from a plurality of bubbling diffusers;
- thereby causing a free and dissolved oxygen content within the undigested sludge to be between four and forty five parts per million;
- and draining the mixing tank when the sludge has been digested as a batch process.
A method for improving digestion rates in a sludge digester which comprises:
- filling a mixing tank with an undigested sludge;
- mixing the sludge with a mechanical mixer;
- forcing oxygen gas under pressure through a plurality of sparger jets protruding from a wall surface of the mixing tank into the interior of the sludge, said jets covering at least 70% of the wall surface;
- bubbling oxygen gas under pressure from a plurality of bubbling diffusers, thereby causing a free and dissolved oxygen content within the undigested sludge to be between four and forty five parts per million;
- and draining processed sludge and introducing new sludge into the mixing tank continuously as a continuous process.
Dependencies are inferred from the claim text.