WO2015160075A1 - Équipement de digestion anaérobie ayant un appareil de circulation interne pour éliminer l'écume et augmenter la quantité produite de gaz de digestion - Google Patents

Équipement de digestion anaérobie ayant un appareil de circulation interne pour éliminer l'écume et augmenter la quantité produite de gaz de digestion Download PDF

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Publication number
WO2015160075A1
WO2015160075A1 PCT/KR2015/000476 KR2015000476W WO2015160075A1 WO 2015160075 A1 WO2015160075 A1 WO 2015160075A1 KR 2015000476 W KR2015000476 W KR 2015000476W WO 2015160075 A1 WO2015160075 A1 WO 2015160075A1
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WO
WIPO (PCT)
Prior art keywords
organic waste
anaerobic digestion
scum
coolant
gas
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PCT/KR2015/000476
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English (en)
Korean (ko)
Inventor
이종인
이창열
Original Assignee
에스케이케미칼 주식회사
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Publication of WO2015160075A1 publication Critical patent/WO2015160075A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2866—Particular arrangements for anaerobic reactors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/44—Time
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/12—Prevention of foaming

Definitions

  • the present invention relates to an anaerobic digestion apparatus having an internal circulation device for removing scum and increasing digestion gas production, and more particularly, to efficiently remove scum generated in the gas-liquid boundary layer above the anaerobic digestion system, and
  • the present invention relates to an anaerobic digestion system having an internal circulation device for scum removal and an increase in the amount of extinguishing gas that can increase the amount of extinguishing gas generated by activating agitation of organic waste.
  • organic waste such as livestock manure and food waste, including sewage sludge generated during sewage treatment, is known to be able to generate digestive gas through an anaerobic digestion process.
  • Methane, and after separation, methane can be reused as an energy source, such as a boiler.
  • a single phase, abnormal or mesophilic digestion process is performed, and such a process has a long residence time of 20 to 30 days or more, while the amount of digested gas stays at 10 m3 / ton. have.
  • the scum is known to occur when an imbalance of digestion occurs due to an overload of organic matter in the digester, a sudden drop in temperature, inadequate agitation in a digester, a poison or heavy metal input, and the like. It reduces the capacity and at the same time causes the problem of suppressing the upper movement for the discharge of digestive gas, and when excessive scum occurs, enters the passage of the digestive gas to obstruct the movement of the digestive gas or closes the passage of the digestive gas Because of the problem of preventing the movement of gas, proper removal of scum is essential.
  • Korean Patent Laid-Open Publication No. 2010-0112430 (2010.10.19) is provided on the stirring shaft inside the anaerobic digestion tank and is formed on the gas liquid boundary layer of the anaerobic digestion tank while rotating along the stirring shaft ( Disclosed is a scum removal apparatus including a scum grinder for grinding a scum layer, and a discharge part in which scum comminuted by the scum grinder is introduced and discharged to the outside of the anaerobic digestion tank.
  • the present invention has been made in order to solve the above-mentioned problems, the organic waste from the bottom of the anaerobic digestion apparatus in the process of making the digestion gas by introducing organic waste from the outside into the anaerobic digestion apparatus of the anaerobic digestion apparatus using a pump By transferring to the upper part and re-injecting and circulating, the scum generated in the gas-liquid boundary layer inside the anaerobic digestion apparatus can be pulled into the liquid portion of the anaerobic digestion apparatus to remove the scum generated and the extinguishing generated in the liquid portion according to the scum removal.
  • An object of the present invention is to provide an anaerobic digestion system having an internal circulation device for removing scum and increasing the amount of extinguishing gas that can be smoothly transported and discharged to the gas unit.
  • Another object of the present invention is to agitate the organic waste circulating in the anaerobic digestion apparatus with an agitation means to increase the amount of digested gas produced.
  • the present invention includes: an anaerobic digestion tank formed with an external inlet port at one side to fill a predetermined amount of organic waste, and an extinguishing gas outlet at which the extinguishing gas of the organic waste is discharged at an upper end thereof; Internal circulation means for internally circulating the organic waste in the anaerobic digester up and down while repeating the recycling operation of discharging the organic waste filled in the anaerobic digester to the bottom and resupplying the upper portion; Heating means for heating the organic waste flowing from the lower portion of the anaerobic digestion tank to the upper portion along the inner circulation means at an appropriate temperature; It provides an anaerobic digestion facility having an internal circulation device for removing scum and increasing the amount of digestion gas generated, characterized in that configured to include.
  • the anaerobic digestion apparatus of the present invention is further characterized by a stirrer rotatably arranged in the anaerobic digestion tank to agitate the organic waste to circulate.
  • the internal circulation means an internal circulation pipe connecting an internal outlet formed in the lower portion of the anaerobic digestion tank and an internal inlet formed in the upper portion;
  • An internal circulation pump configured to pump and supply the organic waste discharged from the internal outlet toward the internal inlet; Characterized in that consisting of.
  • the heating means includes: a coolant tank for storing the coolant; A heating tube mounted to an outer diameter or an inner diameter of the inner circulation pipe of the inner circulation means; A supply side circulation line connected between the outlet of the coolant tank and the inlet of the heating pipe; A discharge side circulation line connected between an inlet of the coolant tank and an outlet of the heating pipe; A coolant circulation pump mounted on the supply side circulation line and circulating the coolant in the coolant tank to the heating pipe; A heater mounted in the coolant tank to heat the coolant for temperature control of the coolant; A controller for controlling an operation cycle and a time of the heater to adjust a coolant temperature in the coolant tank; Characterized in that configured to include.
  • the heating tube is characterized by maintaining the surface temperature of 20 ⁇ 60 ⁇ 10 °C by the refrigerant or fruit flowing therein.
  • the present invention provides the following effects.
  • the digestion gas generated in the liquid portion can be smoothly transferred to the gas portion and discharged smoothly through the digestion gas discharge portion formed at the top of the anaerobic digestion tank. Digestion gas production and collection can be increased.
  • the contact between the digestive gas generating microorganisms in the anaerobic digestion tank and the organic waste can be increased to further increase the amount of digestive gas generated in the liquid portion.
  • FIG. 1 is a block diagram showing an anaerobic digestion facility having an internal circulation device for removing scum and increasing digestion gas production amount according to the present invention.
  • the present invention is to provide an internal circulation means to the anaerobic digester in order to quickly and stably remove scum generated in the anaerobic digester (or anaerobic digester), the organic waste of the lower portion of the anaerobic digester to the gas above the anaerobic digester
  • anaerobic digester or anaerobic digester
  • the organic waste of the lower portion of the anaerobic digester to the gas above the anaerobic digester By re-injecting through the secondary (empty space not filled with organic waste), the scum of the gas-liquid boundary layer is drawn into the liquid portion and removed by the re-injected organic waste, thereby increasing the amount of extinguishing gas and simultaneously extinguishing gas. The point is to make the collection smooth.
  • FIG. 1 is a block diagram showing an anaerobic digestion system having an internal circulation device for removing scum and increasing the amount of extinguishing gas generated in accordance with the present invention.
  • reference numeral 10 denotes an anaerobic digestion apparatus, that is, an anaerobic digestion tank.
  • the anaerobic digestion tank 10 is a hollow cylindrical storage tank, which is supported by a base frame (not shown) and installed in a vertical direction. A structure in which an insulation material (not shown) is attached to an outer surface to maintain an internal temperature. It is provided with.
  • an outer inlet 12 is formed at one lower end of the anaerobic digestion tank 10 to introduce organic waste from the outside into the interior of the anaerobic digestion tank, and at one upper end, an external inflow of organic waste in the anaerobic digestion tank 10 to the outside.
  • Outlet 13 is formed, the upper end is connected to the extinguishing gas discharge port 14 for discharging the extinguishing gas generated in the anaerobic digestion tank 10 to the outside.
  • an inner outlet 16 for circulating organic waste in the anaerobic digestion tank 10 is formed at the lower end of the anaerobic digestion tank 10, that is, the upper end of the anaerobic digestion tank 10, that is, the digestion gas outlet 14 and In the position between the outer outlets 13 is formed an inner inlet 18 for circulating and resupplying organic waste discharged from the inner outlet 16.
  • a stirrer 40 for stirring organic waste is rotatably mounted, for example, a rotary motor is mounted at the top of the anaerobic digestion tank 10 and rotated at the same time.
  • Stirring shaft and vanes connected to the shaft of the motor are arranged up and down in the inner central portion of the anaerobic digestion tank.
  • the internal circulation means for discharging the organic waste filled in the anaerobic digestion tank 10 through the internal outlet 16 and at the same time to be re-supplied to the upper portion in the anaerobic digestion tank 10 through the internal inlet ( 20) is connected to the anaerobic digester (10).
  • the internal circulation means 20 is discharged from the internal circulation pipe 22 and the internal outlet 16 connecting the internal inlet 16 formed in the lower portion of the anaerobic digester 10 and the internal inlet 18 formed in the upper portion It consists of an internal circulation pump 24 for pumping and supplying the organic waste to the internal inlet 18, the internal circulation pump 24 is installed close to the internal outlet (16).
  • the internal circulation pipe 10 is connected to a heating means 30 for controlling the temperature for organic waste
  • the heating means 30 is the anaerobic digestion tank 10 along the internal circulation pipe 22 It is provided to heat the organic waste flowing from the lower part to the upper part to the proper temperature.
  • the heating tube 32 is mounted to the outer or inner diameter of the inner circulation pipe 22.
  • the heating tube 32 is supplied with a coolant from the coolant tank 31 for storing the coolant so that heat exchange is performed for the purpose of maintaining the temperature of the organic waste transported through the inner circulation pipe 22.
  • the outlet of the coolant tank 31 and the inlet of the heating tube 32 are connected via a supply side circulation line 33, and the inlet of the coolant tank 31 and the outlet of the heating tube 32 are It is connected via the discharge side circulation line 34.
  • the supply side circulation line 33 is equipped with a coolant circulation pump 35 for pumping and circulating the coolant in the coolant tank 31 to the heating pipe (32).
  • the coolant tank 31 has a heater 36 for heating the coolant to adjust the temperature of the coolant, and the operation cycle and time of the heater 14 may be used to control the coolant temperature. It is controlled by the controller 37.
  • the coolant circulation pump 35 operates under the control of the controller 37 and the heater 14 operates, the coolant in the coolant tank 31 is temperature-controlled by the operation of the heater 14. At the same time flows to the heating pipe 32 along the supply side circulation line 33, heat exchange with the organic waste flowing in the internal circulation pipe 22 can be maintained, thereby maintaining the organic waste at an appropriate temperature.
  • a supply device (not shown) for supplying organic waste is connected to the outer inlet 12 of the anaerobic digestion tank 10, the organic waste is finished anaerobic digestion to the outer outlet (13)
  • An organic waste treatment device (not shown) for treatment is connected, and the digestion gas outlet 14 is connected to a digestion gas collection and purification device (not shown).
  • anaerobic digestion tank 10 the coolant tank 31, the outer inlet 12 and the outer outlet 13, the inner outlet 16 and the inner inlet 18, the extinguishing gas outlet 14, etc.
  • Measurement sensors and equipment (not shown) and on-off valves (not shown) that can check the state are attached.
  • the organic waste to produce digestive gas through anaerobic digestion is supplied into the anaerobic digestion tank 10 through an external inlet 12.
  • the anaerobic digestion tank 10 can be operated at a constant temperature (20 ⁇ 60 ⁇ 10 ° C. based on the total), but operation at a high temperature of 55 ⁇ 5 ° C. is preferable.
  • anaerobic digestion using organic wastes is performed at medium or high temperatures, in which medium and high temperatures usually mean 35 ° C and 55 ° C.
  • the organic waste discharged after being pretreated at a high temperature of 160 ° C. in the pretreatment step is used by cooling, it is easier to apply to an anaerobic digestion tank that maintains a high temperature of 55 ° C. rather than a medium temperature of 35 ° C.
  • the introduction of organic waste at the same temperature as the anaerobic digester also provides the advantage of minimizing the energy required to heat the anaerobic digester.
  • the agitator 40 in the anaerobic digestion tank 10 is rotated by the controller's control signal to agitate the organic waste.
  • the digestion gas generating microorganisms in the anaerobic digestion tank 10 are contacted with the organic waste.
  • the stirring operation is performed at an appropriate speed to increase, and the organic waste in the anaerobic digestion tank 10 is maintained in a circulated state without being precipitated downward.
  • the organic waste supplied into the anaerobic digestion tank 10 is circulated in the anaerobic digestion tank by the stirring operation of the stirrer 40 to generate a digestive gas, and then discharged through the external outlet 13, and the generated digestive gas is
  • the digestion gas discharge port 14 is transferred to the digestion gas collection and purification device (not shown).
  • the internal circulation pump 24 is operated by a signal from the controller, the organic waste of the lower side of the anaerobic digestion tank 10 is discharged through the internal outlet 16 and at the same time the internal outlet (22) along the internal circulation pipe 22 After being pumped up to 16), it is re-injected through the upper part (empty space gas part) in the anaerobic digestion tank 10.
  • the scum generated in the gas-liquid boundary layer in the anaerobic digestion tank 10 (the surface of the liquid portion of the organic waste forming the boundary with the gaseous portion) is brought into the liquid portion.
  • the scum of the gas-liquid boundary layer can be easily removed, and the circulation of the organic waste in the anaerobic digestion tank 10 is activated by moving the lower organic waste to the top.
  • the extinguishing gas generated in the liquid portion of the organic waste is collected and stagnated by the scum layer before removal, which existed in the gas-liquid boundary layer, and thus, the amount of extinguishing gas collected by the scum is reduced. Since the scum generated in the gas-liquid boundary layer inside the anaerobic digestion tank is easily removed, the digestion gas generated in the liquid portion can be smoothly transferred to the gas portion and discharged smoothly through the digestion gas discharge formed at the top of the anaerobic digestion tank. As a result, it is possible to increase the amount of digested gas produced and collected.
  • the stirring through the stirrer 40 is carried out continuously, scum removal and stirring through the internal circulation means is made intermittently, preferably anaerobic digestion tank 10
  • the performance of the internal circulation pump 24, the amount of scum, etc., the number and time of internal circulation of organic wastes are appropriately controlled, but 1 to 4 times / day and 0.5 to 1 hour / time are preferable. .
  • the external inlet 12 and the external outlet 13 of the anaerobic digestion tank 10 are preferably temporarily closed, but the external inflow and outflow of organic waste is made. You can drive even in situations.
  • the internal circulation pump 24 of the internal circulation means 20 is driven, and before the organic waste is circulated along the internal circulation pipe 22, the internal circulation pipe 22 is the same temperature condition as the temperature in the anaerobic digestion tank 10. Preferably, the internal circulation pipe 22 is heated by the heating means 30 provided as above.
  • the controller 37 first turns on the heater 36 in the coolant tank 31 to heat the coolant in the coolant tank 31 to a set temperature.
  • the coolant in the coolant tank 31 is supplied to the supply side circulation line by operating the coolant circulation pump 35 in the controller 37. 33) to the heating tube (32).
  • the heat exchange between the coolant flowing through the heating tube 32 and the inner circulation pipe 22 is made, preferably the surface temperature of the heating tube 32 is maintained by 20 ⁇ 60 ⁇ 10 °C by the cold refrigerant
  • the internal circulation pipe 22 is also maintained at 20 to 60 ⁇ 10 ° C by heat exchange, and thus the temperature of the organic waste flowing in the internal circulation pipe 22 can be controlled to be the same as the temperature in the anaerobic digestion tank.
  • the reason for heating the organic waste circulating from the bottom of the anaerobic digestion tank to the appropriate temperature using a heating means is because the inner circulation pipe 22 directly contacts the outside air from the outside of the digester to heat the inner circulation pipe 22.
  • the temperature of the organic waste can be controlled to be the same as the temperature in the anaerobic digester.
  • the temperature change of the organic waste flowing in the internal circulation pipe 22 using the heating pipe 32 is the same as the temperature in the anaerobic digestion tank. Will be adjusted.
  • the surface temperature of the heating tube is maintained at 20 ⁇ 60 ⁇ 10 °C, but slightly higher than the inner circulation pipe, so that the organic waste circulating in the inner circulation pipe is also heated to 20 ⁇ 60 ⁇ 10 °C level.
  • the internal circulation means of the present invention by circulating the organic waste from the bottom to the top according to the internal circulation means of the present invention, scum generated in the gas-liquid boundary layer in the anaerobic digestion tank can be drawn into the liquid part and easily removed, thereby generating in the anaerobic digestion process.
  • the digestion gas can be easily moved to the gas part to increase the generation and collection efficiency of the digestion gas, and also increase the contact time and the number of digestion gas generating microorganisms and the organic waste through smooth agitation of the organic waste to increase the amount of digestion gas generated. Can be increased.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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  • Physics & Mathematics (AREA)
  • Treatment Of Sludge (AREA)

Abstract

La présente invention concerne un équipement de digestion anaérobie comportant un appareil de circulation interne pour éliminer l'écume et augmenter la quantité produite de gaz de digestion et, plus particulièrement, un équipement de digestion anaérobie ayant un appareil de circulation interne pour éliminer l'écume et augmenter la quantité produite de gaz de digestion, qui élimine efficacement l'écume produite au niveau d'une couche de limite de gaz-liquide au niveau de la partie supérieure d'une installation de digestion anaérobie à un stade précoce, et active l'agitation de déchets organiques à l'intérieur d'une cuve de digestion de façon à augmenter la quantité produite de gaz de digestion. En particulier, la présente invention cherche à fournir un équipement de digestion anaérobie ayant un appareil de circulation interne pour éliminer l'écume et augmenter la quantité produite de gaz de digestion, qui, dans un procédé de production de gaz de digestion par introduction de déchets organiques depuis l'extérieur dans un dispositif de digestion anaérobie, et leur digestion, utilise une pompe pour transférer des déchets organiques, au niveau de la partie inférieure du dispositif de digestion anaérobie, à la partie supérieure du dispositif de digestion anaérobie pour les réintroduire et les faire circuler, et aspire l'écume produite au niveau de la couche de limite de gaz-liquide à l'intérieur du dispositif de digestion anaérobie dans une partie de liquide du dispositif de digestion anaérobie de façon à éliminer l'écume produite, de telle sorte qu'un gaz de digestion, produit dans la partie liquide en raison de l'élimination d'écume, peut être facilement transféré à une partie de gaz et évacué.
PCT/KR2015/000476 2014-04-17 2015-01-16 Équipement de digestion anaérobie ayant un appareil de circulation interne pour éliminer l'écume et augmenter la quantité produite de gaz de digestion WO2015160075A1 (fr)

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KR1020140045743A KR20150120065A (ko) 2014-04-17 2014-04-17 스컴 제거 및 소화가스 생성량 증가용 내부순환 장치를 구비한 혐기소화 설비
KR10-2014-0045743 2014-04-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113772815A (zh) * 2021-05-27 2021-12-10 中国海洋大学 一种混合式分类填料的厌氧发酵池

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KR100907915B1 (ko) * 2008-12-23 2009-07-16 주식회사 한국종합기술 친환경 완전혼합다단반응조를 이용한 유기성폐기물의 고효율 바이오 에너지화장치
JP2010227914A (ja) * 2009-03-30 2010-10-14 Metawater Co Ltd メタン発酵処理方法及びメタン発酵処理装置
KR20130091535A (ko) * 2012-02-08 2013-08-19 에스케이케미칼주식회사 유기성 폐기물의 혐기소화 활성 유도용 미생물 배양기
KR101351005B1 (ko) * 2012-07-02 2014-01-14 서준용 혐기성 소화조 및 이를 이용하는 바이오가스 생산장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100907915B1 (ko) * 2008-12-23 2009-07-16 주식회사 한국종합기술 친환경 완전혼합다단반응조를 이용한 유기성폐기물의 고효율 바이오 에너지화장치
JP2010227914A (ja) * 2009-03-30 2010-10-14 Metawater Co Ltd メタン発酵処理方法及びメタン発酵処理装置
KR20130091535A (ko) * 2012-02-08 2013-08-19 에스케이케미칼주식회사 유기성 폐기물의 혐기소화 활성 유도용 미생물 배양기
KR101351005B1 (ko) * 2012-07-02 2014-01-14 서준용 혐기성 소화조 및 이를 이용하는 바이오가스 생산장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113772815A (zh) * 2021-05-27 2021-12-10 中国海洋大学 一种混合式分类填料的厌氧发酵池

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