Method and system for hydrothermal carbonization and wet oxidation of sludge

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United States of America Patent

PATENT NO 11724952
SERIAL NO

17295017

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Abstract

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There is provided a method of hydrothermal carbonization of a sludge from a wastewater treatment plant, comprising the steps of: preheating the sludge with at least one first steam fraction to obtain a preheated sludge; further heating the preheated sludge with a second steam fraction to obtain a heated sludge; subjecting the heated sludge to hydrothermal carbonization (HTC) in a reactor to obtain a HTC-treated slurry; mixing the HTC-treated slurry with an oxidizing agent, such as oxygen gas, to obtain a wet-oxidized slurry; subjecting the wet-oxidized slurry to flashing to obtain the second steam fraction and a pre-cooled slurry; subjecting the pre-cooled slurry to flashing in at least one step to obtain the at least one first steam fraction and a cooled slurry; separating the cooled slurry into a liquid fraction and a solids fraction; and routing the liquid fraction to the wastewater treatment plant for further treatment, wherein the second steam fraction is used for heating preheated sludge to the temperature of the HTC reaction. A corresponding system is also provided.

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Patent Owner(s)

Patent OwnerAddress
C-GREEN TECHNOLOGY AB170 63 SOLNA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lundqvist, Fredrik Ekero, SE 26 105
Oden, Erik Stocksund, SE 10 64
Ohman, Fredrik Gavle, SE 9 99

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