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公开(公告)号：US11724952B2
公开(公告)日：2023-08-15
申请号：US17295017
申请日：2019-11-22
Applicant: C-Green Technology AB
Inventor： Fredrik Lundqvist , Erik Oden , Fredrik Ohman
CPC classification number: C02F9/00 , C10L5/48 , C10L9/086 , C02F1/06 , C02F11/08 , C02F11/10 , C02F11/18 , C10L2290/06
Abstract: 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 Agency Ranking
公开(公告)号：US20210087093A1
公开(公告)日：2021-03-25
申请号：US16954288
申请日：2018-12-11
Applicant: C-Green Technology AB
Inventor： Fredrik Lundqvist , Erik Oden , Fredrik Ohman
Abstract: There is provided a method of hydrothermal carbonization of a sludge, comprising the steps of: preheating the sludge to obtain a preheated sludge; mixing the preheated sludge with a wet-oxidized fraction to obtain a reaction mixture; subjecting the reaction mixture to hydrothermal carbonization (HTC) in a reactor to obtain a HTC-treated sludge; separating a fraction from the HTC-treated sludge; and mixing the fraction with an oxidizing agent, such as oxygen gas, to obtain the wet-oxidized fraction, wherein the temperature of the fraction before the wet oxidation is at least 15° C. higher than the temperature of the preheated sludge. A corresponding system is also provided.
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公开(公告)号：US20210078890A1
公开(公告)日：2021-03-18
申请号：US16954296
申请日：2018-12-11
Applicant: C-Green Technology AB
Inventor： Fredrik Lundqvist , Erik Oden , Fredrik Ohman
Abstract: There is provided a method of hydrothermal carbonization of a sludge, comprising the steps of: a) preheating the sludge to obtain a preheated sludge; b) adding an oxidizing agent, such as oxygen gas, to the preheated sludge; and c) subjecting the sludge from step b) to hydrothermal carbonization (HTC) in a reactor to obtain a HTC-treated sludge.
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公开(公告)号：US20190161373A1
公开(公告)日：2019-05-30
申请号：US16306280
申请日：2017-06-21
Applicant: C-GREEN TECHNOLOGY AB
Inventor： Fredrik Lundqvist , Erik Odén , Fredrik Öhman
Abstract: There is provided a method of treatment of sludge, such as municipal or industrial sludge from a wastewater treatment plant, comprising the steps of: —preheating an incoming sludge with at least one steam fraction, preferably by direct steam injection, to obtain a preheated sludge; —further heating the preheated sludge with a high-temperature steam fraction, preferably by direct steam injection, to obtain a heated sludge; —hydrothermal carbonization (HTC) of the heated sludge to obtain a HTC-treated sludge; —separating a particle-lean fraction from the HTC-treated sludge; —wet oxidation of the particle-lean fraction to obtain a heated particle-lean fraction; —subjecting the heated particle-lean fraction to a first flashing to obtain the high-temperature steam fraction used in the further heating step; —separating a particle-rich fraction from the HTC-treated sludge; —subjecting the particle-rich fraction to flashing to obtain at least one steam fraction that is used in the preheating step and a cooled particle-rich fraction.
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公开(公告)号：US20180194657A1
公开(公告)日：2018-07-12
申请号：US15740318
申请日：2016-06-28
Applicant: C-Green Technology AB
Inventor： Fredrik Ohman , Fredrik Lundqvist , Erik Oden
IPC: C02F9/00
CPC classification number: C02F9/00 , C02F1/44 , C02F1/66 , C02F11/004 , C02F11/10 , C02F11/122 , C02F11/18 , C02F11/20 , C02F2101/105 , C02F2103/28 , C02F2201/008 , C02F2301/046 , Y02W10/40
Abstract: There is provided a system for sludge treatment, which system is arranged in a container adapted to be transported by a truck and comprises: a sludge inlet for receiving a sludge; a reactor comprising an electrical heating arrangement for heat treatment of the sludge, which reactor is arranged downstream the sludge inlet; a flashing arrangement for cooling sludge treated in the reactor and providing at least one steam fraction, which flashing arrangement is arranged downstream the reactor; a steam routing arrangement capable of routing the at least one steam fraction from the flashing arrangement to preheat sludge transported from the sludge inlet to the reactor; and a separation arrangement for separating the cooled sludge from the flashing arrangement into a first fraction and a second fraction, wherein the suspended solids content is higher in the first fraction than in the second fraction. A corresponding method is also provided.
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公开(公告)号：US20220002176A1
公开(公告)日：2022-01-06
申请号：US17295017
申请日：2019-11-22
Applicant: C-Green Technology AB
Inventor： Fredrik Lundqvist , Erik Oden , Fredrik Ohman
Abstract: 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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