Method and system for sanitizing the digestate in biogas production
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- KANADEVIA INOVA AG
- Filing Date
- 2024-05-30
- Publication Date
- 2026-06-11
AI Technical Summary
【0013】 具体的には、本発明の方法は、バイオガスへの有機バイオマスの変換、及び中温条件下でのダイジェステートに向けられており、ダイジェステートの衛生化は、後続の熱処理工程によって達成される。本発明に従って、本方法は、 a)嫌気性ダイジェスター内、50℃未満の温度で、酸素不在下で、微生物により有機バイオマスを分解させてメタン含有バイオガス及びダイジェステートを生成させることを含む嫌気性消化工程、及び b)ダイジェステートの少なくとも一部を、175℃を超える温度で少なくとも1分間処理することを含む熱処理工程、 を含み、ここで、熱処理工程は、熱分解、半炭化(torrefaction)、ガス化、水熱ガス化、水熱炭化及び水熱液化からなる群から選択された1つの処理を含む。 したがって、嫌気性消化工程では、嫌気性ダイジェスター内の細菌の助けを借りて有機バイオマスを嫌気的に消化する。以下では、嫌気性タイプであることを常に明示することなしに、嫌気性ダイジェスターを単に「ダイジェスター」と呼ぶ。
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Figure 2026519071000001_ABST
Abstract
Claims
1. A method for sanitizing the digestate in the production of biogas from biomass, a) An anaerobic digestion process comprising decomposing organic biomass (16) by microorganisms in an anaerobic digester (10) at a temperature below 50°C and in the absence of oxygen to produce methane-containing biogas (12) and digestate (14); b) A heat treatment step comprising treating at least a portion of the digestate (14) at a temperature exceeding 175°C for at least 1 minute. Includes, A method wherein the heat treatment step includes one treatment selected from the group consisting of pyrolysis, semi-carbonization, gasification, hydrothermal gasification, hydrothermal carbonization, and hydrothermal liquefaction.
2. The method according to claim 1, wherein the anaerobic digestion step is carried out at a temperature in the range of 20°C to 48°C, preferably 32°C to 48°C, and most preferably 42°C to 48°C.
3. The method according to claim 1 or 2, wherein, before step b), the digestate (14) is subjected to solid-liquid phase separation to obtain a solid digestate fraction (22) and a liquid digestate fraction (24), and then at least a portion of the solid digestate fraction (22) is subjected to heat treatment in step b).
4. The method according to claim 3, wherein the heat (35) released during the heat treatment of the solid digestate fraction (22) is recovered and used to heat treat at least a portion of the liquid digestate fraction (24).
5. The method according to any one of claims 1 to 4, wherein the residence time of the organic biomass (16) in the anaerobic digester (10) is less than 15 days.
6. The method according to any one of claims 1 to 5, wherein the heat treatment step b) includes thermal decomposition at a temperature of at least 450°C, preferably 450°C to 850°C, for at least 15 minutes, particularly 15 to 180 minutes, preferably 20 to 140 minutes.
7. The method according to any one of claims 1 to 6, wherein the heat treatment step b) includes semi-carbonizing at a temperature of at least 200°C, more preferably 250°C to 350°C, for a processing time of at least 40 minutes.
8. The method according to any one of claims 1 to 6, wherein the heat treatment step b) preferably includes gasification carried out at a temperature in the range of at least 600°C, more preferably at least 700°C, and particularly in the range of 700 to 1200°C.
9. The method according to any one of claims 1 to 6, wherein the heat treatment step includes hydrothermal carbonization for at least 30 minutes, preferably at least 1 hour, more preferably at least 2 hours, particularly 2 to 5 hours, preferably at a temperature in the range of 175°C to 350°C.
10. The method according to any one of claims 1 to 9, wherein the heat treatment step is carried out at ambient pressure.
11. The method according to any one of claims 1 to 10, wherein the pH inside the digester (10) is maintained at less than 12.
12. A system for sanitizing the digestate (14) in the production of biogas (12), wherein the system is An anaerobic digester (10) configured to produce methane-containing biogas and digestate by anaerobic digestion of organic biomass by microorganisms in the absence of oxygen, An entry point for accepting organic biomass (16), The first outlet for releasing biogas (12), A second outlet for releasing digestate (14), and A temperature controller for maintaining the temperature inside the digester (10) below 50°C, An anaerobic digester (10) equipped with, Means for supplying at least a portion of the digestate (14) from the digester (10) to the heat treatment reactor (30), Equipped with, The heat treatment reactor (30) is configured to heat at least a portion of the digestate (14) to a temperature of at least 175°C, and is a system selected from the group consisting of a pyrolysis reactor, a gasification reactor, a hydrothermal gasification reactor, a semi-carbonization reactor, a hydrothermal carbonization reactor, and a hydrothermal liquefaction reactor.
13. The system according to claim 12, wherein the digester (10) is a dry or semi-dry digester operated in plug-flow mode.
14. The system includes a dehydration device (20), preferably a screw press, for separating the digestate (14) into a solid digestate fraction (22) and a liquid digestate fraction (24). The system according to claim 12 or 13, further comprising means for supplying the digestate (14) from the digester to the dehydration device (20), and means for supplying at least a portion of the solid digestate fraction (22) to the heat treatment reactor (30).
15. Sanitizer (36), A heat transfer means for transferring the thermal energy (35) released from the heat treatment reactor (30) to the sanitizer (36), and Means for supplying at least a portion of the liquid digestate fraction (24) to the sanitizer (36), The system according to claim 14, further comprising: