KR20130020037A - Anaerobic digestion system - Google Patents

Anaerobic digestion system Download PDF

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KR20130020037A
KR20130020037A KR20110082400A KR20110082400A KR20130020037A KR 20130020037 A KR20130020037 A KR 20130020037A KR 20110082400 A KR20110082400 A KR 20110082400A KR 20110082400 A KR20110082400 A KR 20110082400A KR 20130020037 A KR20130020037 A KR 20130020037A
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fermentation tank
digestion
methane fermentation
acid
acid fermentation
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KR101314336B1 (en
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장희현
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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

PURPOSE: An anaerobic digestion system capable of a pH control is provided to control the pH of digestive fluid in a methane fermentation step by lowering the CO_2 concentration of a digestion gas generated in a acid fermentation step. CONSTITUTION: An anaerobic digestion system capable of a pH control includes an acid fermentation bath(10), a digestive fluid discharge line(20), a methane fermentation bath(30), a digestion gas discharge pipe(40), CO_2 absorption tower(50), and a digestion gas supply pipe(60). An acid fermentation bath ferments a processed substance. A digestive fluid discharge line is connected to the lower end of the acid fermentation bath. A methane fermentation bath is connected to the other end of the digestive fluid discharge line. A digestion gas discharge pipe is connected to the top of the acid fermentation bath. A CO_2 absorption tower reduces the CO_2 concentration of a digestion gas discharged from a digestion gas discharge pipe by being connected to the digestion gas discharge pipe. A digestion gas supply pipe is equipped between a CO_2 absorption tower and a methane fermentation bath and supplies a digestion gas processed in a CO_2 absorption tower to the methane fermentation bath. A CO_2 concentration is reduced by processing a digestion gas generated in the acid fermentation bath in the CO_2 absorption tower, and the pH of a methane fermentation bath(30) is controlled by supplying a digestion gas in which a CO_2 concentration is reduced to the methane fermentation bath.

Description

ｐＨ조절이 가능한 혐기소화시스템{Anaerobic Digestion System} Anaerobic Digestion System with pH Control

본 발명은 pH조절이 가능한 혐기소화시스템에 관한 것으로서, 보다 상세하게는 별도의 완충제를 투입하지 않고도 소화액의 pH조절이 가능한 새로운 구성의 pH조절이 가능한 혐기소화시스템에 관한 것이다.
The present invention relates to an anaerobic digestion system capable of adjusting pH, and more particularly, to an anaerobic digestion system capable of pH adjustment of a new configuration capable of adjusting pH of digestive fluids without adding a separate buffer.

일반적으로 오폐수를 처리하는 소화시스템은 초기 소화단계인 산발효단계와, 산발효단계 후에 이루어지는 메탄발효단계로 이루어진다. 그런데 산발효단계에 관여하는 산발효균과 메탄발효단계에 관여하는 메탄발효균은 최적 생장조건 특히, pH조건이 상이하다. 산발효균은 pH 5.1~6.5 정도에서 가장 활성화되고, 메탄발효균은 이 보다 높은 pH 7.4~8.0 정도에서 가장 활성화된다. In general, a digestive system for treating wastewater consists of an acid fermentation stage, which is an initial digestion stage, and a methane fermentation stage, which occurs after the acid fermentation stage. However, the acid fermentation bacteria involved in the acid fermentation step and the methane fermentation bacteria involved in the methane fermentation step have different growth conditions, particularly pH conditions. Acid-fermenting bacteria are most active at pH 5.1-6.5 and methane-fermenting bacteria are most active at pH 7.4-8.0.

그러나 메탄발효균의 메탄 생성 속도가 산발효균의 유기산 발생 속도보다 느리기 때문에 소화과정에서 지방산이 축적되어 소화액의 pH가 저하된다. 더욱이 산발효과정에서 발생된 소화가스에 함유된 이산화탄소가 소화액에 용해되어 탄산이 생성되는데, 이러한 과정에서 발생되는 탄산에 의해서도 소화액의 pH가 저하된다. 따라서 메탄균발효단계에서 효과적인 소화가 이루어지도록 하기위해 소화액의 pH를 조절하여야 한다. However, since the methane production rate of methane fermentation bacteria is slower than that of acid fermentation organic acids, fatty acids accumulate during digestion and the pH of digestive juices is lowered. In addition, carbon dioxide contained in the digestive gas generated in the sporadic effect tablet is dissolved in the digestive liquid to produce carbonic acid. The carbonic acid generated in this process also lowers the pH of the digestive liquid. Therefore, the pH of the digestive fluid should be adjusted to ensure effective digestion in the methane fermentation stage.

한편, 이러한 문제점을 해결하기 위한 여러 가지 방안들이 제안되고 있다. 그러나 그 대부분은 완충액을 사용하여 소화액의 pH를 조절하는 방법이며, 이러한 방법은 많은 양의 완충액이 요구되며, 완충액에 의해 소화액의 부피가 늘어나는 등의 문제점을 가진다.
On the other hand, various methods have been proposed to solve this problem. However, most of them use a buffer to adjust the pH of the digestive fluid, and this method requires a large amount of buffer and has problems such as an increase in the volume of the digestive fluid by the buffer.

대한민국 특허 제10-0883676호(2009. 02. 06)Republic of Korea Patent No. 10-0883676 (2009. 02. 06)

본 발명은 상기의 문제점을 해결하기 위한 것으로서, 본 발명의 목적은 메탄발효단계에서 메탄발효균이 활성화되어 효과적인 소화가 이루어지도록 하기 위해 소화액의 pH를 경제적이고 효율적으로 조절할 수 있는 새로운 구성의 pH조절이 가능한 혐기소화시스템을 제공하는 것이다.
The present invention has been made to solve the above problems, an object of the present invention is to adjust the pH of the digestive fluid in a new configuration to enable effective digestion of the methane fermentation bacteria in the methane fermentation step is effective and efficient To provide a possible anaerobic digestion system.

본 발명의 특징에 따르면, 피처리물을 산발효시키는 산발효조(10)와, 상기 산발효조(10)의 하단부에 연결되어 산발효조(10)에서 처리된 소화액이 배출되는 소화액배출라인(20)과, 상기 소화액배출라인(20)의 타단에 연결되어 상기 산발효조(10)에서 처리된 소화액을 메탄발효시키는 메탄발효조(30)와, 상기 산발효조(10)의 상단부에 연결되어 산발효조(10)에서 발생된 소화가스가 배출되는 소화가스배출관(40)과, 이 소화가스배출관(40)에 연결되어 소화가스배출관(40)에서 배출되는 소화가스의 CO2농도를 감소시키는 CO2흡수탑(50)과, 상기 CO2흡수탑(50)과 메탄발효조(30) 사이에 구비되어 CO2흡수탑(50)에서 처리된 소화가스를 상기 메탄발효조(30)로 공급하는 소화가스공급관(60)을 포함하여 이루어져서, 상기 산발효조(10)에서 생성된 소화가스가 상기 CO2흡수탑(50)에서 처리되어 CO2농도가 감소되고, CO2농도가 감소된 소화가스가 상기 메탄발효조(30)로 공급됨으로써 메탄발효조(30)의 pH가 조절되는 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템이 제공된다.
According to a feature of the present invention, the acid fermentation tank 10 for acid fermenting the object to be treated, and the digestive fluid discharge line 20 is connected to the lower end of the acid fermentation tank 10, the extinguishing liquid treated in the acid fermentation tank 10 is discharged And a methane fermentation tank 30 connected to the other end of the digestion liquid discharge line 20 to methane fermentation of the digestion solution treated in the acid fermentation tank 10, and an acid fermentation tank 10 connected to the upper end of the acid fermentation tank 10. ) the extinguishing gas discharge pipe 40 that fire extinguishing gas is discharged, and the fire extinguishing gas discharge pipe 40 is connected to the CO 2 absorbent to reduce the CO 2 concentration of the digestion gas discharged from the fire extinguishing gas discharge pipe 40. tower generated from ( 50), is provided between the CO 2 absorption tower 50 and the methane fermentation tank 30, the extinguishing gas supply pipe for supplying the fire extinguishing gas processed by the CO 2 absorption tower 50 to the methane fermentation tank 30, 60, Consists of, the digestion gas generated in the acid fermentation tank 10 is the CO 2 absorption tower ( 50) is treated in the CO 2 concentration is reduced, the digestion gas is reduced CO 2 concentration is supplied to the methane fermentation tank 30, the pH of the methane fermentation tank 30, characterized in that the pH control is possible anaerobic digestion A system is provided.

본 발명의 다른 특징에 따르면, 상기 CO2흡수탑(50)은 하단부에 상기 소화가스배출관(40)의 배출단부가 연결되고, 상단부에는 상기 소화가스공급관(60)이 연결된 바디(52)와, 상기 바디(52) 내부에 구비되어 CO2를 용해시키기 위한 물을 분사하는 분사노즐(53)과, 일단은 상기 바디(52) 하단에 구비된 배수공(54)에 연결되고 타단은 상기 분사노즐(53)에 연결되어 배수공(54)으로 배수되는 물을 분사노즐(53)로 재공급하는 리싸이클관(55)과, 상기 리싸이클관(55)에 구비되어 상기 배수관(54)을 통해 배수되는 물을 가열하여 CO2를 탈기시키는 제1열교환기(56)와, 상기 CO2가 탈기된 물을 냉각시키는 제2열교환기(57)를 포함하여 이루어진 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템이 제공된다.
According to another feature of the invention, the CO 2 absorption tower 50 is connected to the discharge end of the extinguishing gas discharge pipe 40 at the lower end, the body 52 and the extinguishing gas supply pipe 60 is connected to the upper end, The injection nozzle 53 is provided inside the body 52 to inject water for dissolving CO 2 , one end is connected to the drain hole 54 provided at the lower end of the body 52 and the other end is the injection nozzle ( A recycling pipe 55 connected to the water supply pipe 53 to supply the water discharged to the drain hole 54 to the injection nozzle 53, and the water discharged through the drain pipe 54 provided at the recycling pipe 55. providing a first heat exchanger 56 and second heat exchanger 57 is capable of anaerobic digestion system, pH control, characterized in that comprising an that the CO 2 is cooled to the deaerated water heating by degassing the CO 2 do.

본 발명의 또 다른 특징에 따르면, 피처리물을 산발효시키는 산발효조(10)와, 상기 산발효조(10)의 후단에 구비되어 산발효조(10)에서 처리된 소화액을 메탄발효시키는 메탄발효조(30)와, 상기 산발효조(10)의 상단부와 메탄발효조(30)의 상단부 사이에 연결되어 산발효조(10)에서 발생된 소화가스를 메탄발효조(30)로 공급하는 소화가스공급관(48)과, 상기 메탄발효조(30) 상단에 구비되어 메탄발효조 내부의 소화가스를 외부로 배출시키는 소화가스배출관(49)과, 상기 소화가스배출관(49)에서 배출되는 소화가스의 CO2농도를 감소시키는 CO2흡수탑(50)과, 상기 CO2흡수탑(50)에서 처리된 소화가스를 상기 메탄발효조(30)로 리싸이클시키는 소화가스리싸이클관(66)을 포함하여 이루어져서, 소화가스가 상기 CO2흡수탑(50)에서 처리되어 CO2농도가 감소됨으로써 메탄발효조(30)의 pH가 조절되는 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템이 제공된다.
According to another feature of the present invention, an acid fermentation tank 10 for acid fermenting a to-be-processed object and a methane fermentation tank for methane fermenting a digestion liquid treated in an acid fermentation tank 10 provided at the rear end of the acid fermentation tank 10 ( 30) and the digestion gas supply pipe 48 is connected between the upper end of the acid fermentation tank 10 and the upper end of the methane fermentation tank 30 to supply the digestion gas generated in the acid fermentation tank 10 to the methane fermentation tank 30; Is provided on the top of the methane fermentation tank 30, the digestion gas discharge pipe 49 for discharging the digestion gas inside the methane fermentation tank to the outside, and CO to reduce the CO 2 concentration of the digestion gas discharged from the digestion gas discharge pipe 49 2 includes an absorption tower 50 and a digestion gas cycle tube 66 for recycling the digestion gas treated in the CO 2 absorption tower 50 to the methane fermentation tank 30, whereby the digestion gas absorbs the CO 2. It is treated in the container (50) by being methoxy CO 2 concentration is reduced The anaerobic digestion system capable of pH adjustment, characterized in that the pH of the fermentation tank 30 is controlled, is provided.

본 발명의 또 다른 특징에 따르면, 피처리물을 산발효시키는 산발효조(10)와, 상기 산발효조(10)의 후단에 구비되어 산발효조(10)에서 처리된 소화액을 메탄발효시키는 메탄발효조(30)와, 상기 산발효조(10)의 상단부에 연결되어 산발효조(10)에서 발생된 소화가스가 배출되는 소화가스배출관(40)과, 이 소화가스배출관(40)에 연결되어 소화가스배출관(40)에서 배출되는 소화가스의 CO2농도를 조절하는 CO2흡수탑(50)과, 상기 CO2흡수탑(50)에서 처리된 소화가스를 상기 산발효조(10)로 리싸이클시키는 소화가스리싸이클관(61)과, 상기 산발효조(10)와 메탄발효조(30) 사이에 구비되어 산발효조(10)의 소화가스를 메탄발효조(30)로 공급하는 소화가스공급관(62)을 포함하여 이루어져서, 상기 산발효조(10)에서 생성된 소화가스가 상기 CO2흡수탑(50)에서 처리되어 CO2농도가 감소되고, CO2농도가 감소된 소화가스가 상기 메탄발효조(30)로 공급됨으로써 메탄발효조(30)의 pH가 조절되는 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템이 제공된다.
According to another feature of the present invention, an acid fermentation tank 10 for acid fermenting a to-be-processed object and a methane fermentation tank for methane fermenting a digestion liquid treated in an acid fermentation tank 10 provided at the rear end of the acid fermentation tank 10 ( 30) and the digestion gas discharge pipe 40 is connected to the upper end of the acid fermentation tank 10 to discharge the digestion gas generated from the acid fermentation tank 10, and the digestion gas discharge pipe 40 is connected to the digestion gas discharge pipe ( CO 2 absorption tower 50 for adjusting the CO 2 concentration of the extinguishing gas discharged from 40), and the digestion gas cycle pipe for recycling the digestion gas treated in the CO 2 absorption tower 50 to the acid fermentation tank (10). And a digestion gas supply pipe (62) provided between the acid fermentation tank (10) and the methane fermentation tank (30) to supply digestion gas of the acid fermentation tank (10) to the methane fermentation tank (30), wherein Digestion gas generated in the acid fermentation tank 10 is treated in the CO 2 absorption tower 50 to CO 2 concentration The degree is reduced, the digestion gas with a reduced CO 2 concentration is supplied to the methane fermentation tank 30 is provided with a pH adjustable anaerobic digestion system, characterized in that the pH of the methane fermentation tank 30 is adjusted.

이상과 같은 구성을 가지는 본 발명은 산발효단계에서 발생된 소화가스 중의 CO2농도를 저하시킴으로써 메탄발효단계에서의 소화액의 pH를 조절한다. The present invention having the configuration as described above adjusts the pH of the digestion liquid in the methane fermentation step by lowering the CO 2 concentration in the digestion gas generated in the acid fermentation step.

이러한 본 발명은 완충액을 사용하는 종래의 기술과 달리 소화과정에서 발생되는 소화가스의 CO2농도를 조절하여 소화액의 pH를 조절하는 것이므로 완충액의 사용에 따른 추가비용발생이 없어서 경제적이며, 또한, CO2흡수탑에서는 CO2를 흡수한 물에서 CO2를 탈기시켜 재사용하기 때문에 한층 더 경제성이 우수하다. The present invention is to control the pH of the digestion liquid by adjusting the CO 2 concentration of the digestion gas generated in the digestion process, unlike the prior art using a buffer solution, and there is no additional cost caused by the use of the buffer, economical, CO in the second absorption tower is even more excellent in economical efficiency because the re-use by degassing the CO 2 in the water that has absorbed the CO 2.

도 1은 본 발명의 일 실시예에 따른 시스템의 개략도
도 2는 본 발명의 다른 실시예에 따른 시스템의 개략도
도 3은 본 발명의 또 다른 실시예에 따른 시스템의 개략도
1 is a schematic diagram of a system according to an embodiment of the present invention;
2 is a schematic diagram of a system according to another embodiment of the present invention;
3 is a schematic diagram of a system according to another embodiment of the present invention;

이하에서 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

본 발명은 도 1에 도시된 바와 같이, 피처리물을 산발효시키는 산발효조(10)와, 산발효조(10)의 하단부에 연결되어 산발효조(10)에서 처리된 소화액이 배출되는 소화액배출라인(20)과, 소화액배출라인(20)의 타단에 연결되어 상기 산발효조에서 처리된 소화액을 메탄발효시키는 메탄발효조(30)와, 상기 산발효조(10)의 상단부에 연결되어 산발효조(10)에서 발생된 소화가스가 배출되는 소화가스배출관(40)과, 이 소화가스배출관(40)에 연결되어 소화가스배출관(40)에서 배출되는 소화가스의 CO2농도를 조절하는 CO2흡수탑(50)과, 상기 CO2흡수탑(50)과 메탄발효조(30) 사이에 구비되어 CO2흡수탑(50)에서 처리된 소화가스를 상기 메탄발효조(30)로 공급하는 소화가스공급관(60)을 포함하여 이루어진다. The present invention, as shown in Figure 1, the acid fermentation tank 10 to acidify the object to be treated, and the digestive fluid discharge line is connected to the lower end of the acid fermentation tank 10, the extinguishing fluid treated in the acid fermentation tank 10 is discharged (20) and the methane fermentation tank (30) connected to the other end of the digestive fluid discharge line (20) for methane fermentation of the digestion liquid treated in the acid fermentation tank, and the acid fermentation tank (10) connected to the upper end of the acid fermentation tank (10). and the fire extinguishing gas is discharged extinguishing gas discharge pipe 40, which is generated in, the fire extinguishing gas discharge pipe 40 is connected to the extinguishing gas discharge pipe 40 CO 2 absorption tower to control the CO 2 concentration of the digestion gas discharged from the (50 ) and, is provided between the CO 2 absorption tower 50 and the methane fermentation tank 30, the extinguishing gas supply pipe 60 for supplying the fire extinguishing gas processed by the CO 2 absorption tower 50 to the methane fermentation tank 30 It is made to include.

상기 산발효조(10)에는 피처리물이 산발효균에 의해 산발효되어 1차 소화된다. 산발효균은 pH는 5.5~6.5에서 활성화되므로 산발효조(10)의 pH는 상기 수준으로 조절된다. 이러한 산발효조(10)에서 처리된 소화액은 소화액배출라인(20)을 통해 메탄발효조(30)로 공급된다. The acid fermentation tank 10 is subjected to acid fermentation by acid fermentation bacteria to be first digested. Acid fermentation bacteria pH is activated from 5.5 to 6.5, so the pH of the acid fermentation tank 10 is adjusted to the above level. The digestion liquid treated in the acid fermentation tank 10 is supplied to the methane fermentation tank 30 through the digestion liquid discharge line 20.

메탄발효조(30)에서는 메탄발효균에 의해 소화액이 메탄발효되어 메탄이 생성된다. 메탄발효조(30)에서 소화액을 메탄발효시키는 메탄발효균은 pH 7.4~8.0에서 활성화되어 왕성한 활동을 한다.In the methane fermentation tank 30, the digestion liquid is methane fermented by the methane fermentation bacteria to produce methane. Methane fermentation bacteria to methane ferment the digestion in the methane fermentation tank (30) is activated at pH 7.4 ~ 8.0 is active.

한편, 이러한 산발효조(10)와 메탄발효조(30) 사이에 상기 CO2흡수탑(50)이 구비된다. CO2흡수탑(50)은 소화가스 중의 CO2량을 감소시켜 메탄발효조(30)의 pH가 CO2에 의해 저하되지 않도록 한다. On the other hand, the CO 2 absorption tower 50 is provided between the acid fermentation tank 10 and the methane fermentation tank 30. The CO 2 absorption tower 50 reduces the amount of CO 2 in the digestion gas so that the pH of the methane fermentation tank 30 is not lowered by CO 2 .

CO2흡수탑(50)은 하단부에 상기 소화가스배출관(40)의 배출단부가 연결되고, 상단부에는 상기 소화가스공급관(60)이 연결되며, 하단에는 배수관(54)이 구비된 바디(52) 내부에 CO2를 용해시키기 위한 물을 분사하는 분사노즐(53)이 구비되고, 상기 배수관(54)에 연결되어 배수되는 물을 상기 분사노즐(53)로 재 공급하는 리싸이클관(55)을 포함하여 이루어진다.The CO 2 absorption tower 50 has a discharge end of the extinguishing gas discharge pipe 40 is connected to the lower end, the extinguishing gas supply pipe 60 is connected to the upper end, the body 52 is provided with a drain pipe 54 at the lower end An injection nozzle 53 is provided to inject water for dissolving CO 2 therein, and includes a recycle pipe 55 connected to the drain pipe 54 to supply water to the injection nozzle 53 again. It is done by

CO2를 용해시키기 위해 상기 분사노즐(53)에서는 저온의 물이 분사되고, 소화가스 중의 CO2 일부는 물에 용해되어 소화가스의 CO2농도가 저하된다. 한편, CO2가 용해된 물은 배수관(54)을 통해 배출되는데, 상기 리싸이클관(55)에는 용해된 CO2를 탈기시키기 위해 물을 가열하는 제1열교환기(56)와, 상기 CO2가 탈기된 물을 냉각시키는 제2열교환기(57)가 구비되고, 리싸이클관(55)에는 탈기된 CO2가 배출되는 CO2배출콕(58)이 구비된다. In order to dissolve the CO 2 , low-temperature water is injected from the injection nozzle 53, and a part of the CO 2 in the extinguishing gas is dissolved in water to lower the CO 2 concentration of the extinguishing gas. Meanwhile, water in which CO 2 is dissolved is discharged through a drain pipe (54). The recycle pipe (55) includes a first heat exchanger (56) for heating water to degas the dissolved CO 2 , and the CO 2 is A second heat exchanger 57 is provided to cool the degassed water, and the recycle pipe 55 is provided with a CO 2 discharge cock 58 through which degassed CO 2 is discharged.

제1열교환기(56)는 배수관으로 배출되는 물을 비등점 이상으로 가열하여 물에 용해된 CO2를 탈기시킨다. 그리고 제1열교환기(56)에 의해 가열된 물은 제2열교환기(57)에서 냉각되어 상기 분사노즐(53)로 재공급된다. 제1열교환기(56)의 열매체는 물을 가열시키고 냉각되기 때문에 제1열교환기(56)에서 냉각된 열매체가 제2열교환기(57)의 열매체로 사용되어 제1열교환기(56)에서 가열된 물을 냉각시키도록 구성되면 에너지절감효과를 얻을 수 있어서 경제적이다. The first heat exchanger 56 degass CO 2 dissolved in the water by heating the water discharged to the drain pipe above the boiling point. The water heated by the first heat exchanger 56 is cooled in the second heat exchanger 57 and resupplied to the injection nozzle 53. Since the heat medium of the first heat exchanger 56 heats and cools water, the heat medium cooled in the first heat exchanger 56 is used as the heat medium of the second heat exchanger 57 to heat the first heat exchanger 56. When it is configured to cool the water, it is economical because energy saving effect can be obtained.

경우에 따라서는 제1열교환기(56)에서 가열된 물을 오폐수처리 후에 발생되는 슬러리를 가열, 건조시키거나 소화액을 가온시키는데 활용할 수도 있다. 이 경우에는 제2열교환기(57)가 요구되지 않는다.In some cases, the water heated in the first heat exchanger 56 may be used to heat and dry the slurry generated after the wastewater treatment, or to warm up the digestion liquid. In this case, the second heat exchanger 57 is not required.

이와 같이 하여 CO2농도가 조절된 소화가스는 소화가스공급관(60)을 통해 메탄발효조(30)로 공급된다. 한편, 소화가스의 주성분은 메탄가스, 이산화탄소, 황화수소인데, 메탄가스는 물에 거의 녹지 않으므로 CO2흡수탑(50)에서 용해되지 않고, CO2와 더불어 황화수소도 함께 제거된다. 황화수소는 유독성이 있을 뿐만 아니라 소화에 불필요한 가스이다. In this way, the CO 2 concentration controlled digestion gas is supplied to the methane fermentation tank 30 through the digestion gas supply pipe (60). On the other hand, the main components of the digestive gas is methane gas, carbon dioxide, hydrogen sulfide, methane gas is almost insoluble in water, so that it is not dissolved in the CO 2 absorption tower 50, the hydrogen sulfide is also removed together with CO 2 . Hydrogen sulfide is not only toxic but also a gas that is unnecessary for digestion.

상기 산발효조(10)와 메탄발효조(30)에는 pH센서, CO2센서, HCO3 -센서, VFAS(휘발성 유기산)센서 등이 구비되어, 상기 요소들의 농도를 외부에서 모니터링할 수 있도록 구성된다. 모니터링된 값에 따라 상기 CO2흡수탑(50)의 분사노즐(53)로 분사되는 물의 온도와 양을 조절하여 소화가스 중의 CO2농도를 조절한다. The acid fermentation tank 10 and the methane fermentation tank 30 are equipped with a pH sensor, CO 2 sensor, HCO 3 - sensor, VFA S (volatile organic acid) sensor, etc., is configured to monitor the concentration of the elements from the outside . The CO 2 concentration in the extinguishing gas is controlled by controlling the temperature and amount of water injected into the injection nozzle 53 of the CO 2 absorption tower 50 according to the monitored value.

도 2는 본 발명의 다른 실시예를 보인 것으로서, 상기 메탄발효조(30)에 CO2흡수탑(50)이 연결된 것을 보인 것이다. 이 경우에는 산발효조(10)에서 생성된 소화가스가 소화가스공급관(48)을 통해 메탄발효조(30)로 공급되고, 메탄발효조(30) 내부의 소화가스가 소화가스배출관(49)을 통해 CO2흡수탑(50)로 공급되어, CO2흡수탑(50)에서 처리된다. CO2흡수탑(50)에서 처리되어 CO2농도가 저하된 소화가스는 소화가스리싸이클관(66)을 통해 메탄발효조(30)로 재 공급된다. Figure 2 shows another embodiment of the present invention, it is shown that the CO 2 absorption tower 50 is connected to the methane fermentation tank (30). In this case, the digestion gas generated in the acid fermentation tank 10 is supplied to the methane fermentation tank 30 through the digestion gas supply pipe 48, and the digestion gas inside the methane fermentation tank 30 is supplied via the digestion gas discharge pipe 49. 2 is supplied to the absorption tower 50, and treated in the CO 2 absorption tower (50). The digested gas treated in the CO 2 absorption tower 50 and the CO 2 concentration is lowered is re-supplied to the methane fermentation tank 30 through the digestive gas cycle pipe 66.

전술한 실시예의 경우에는 CO2흡수탑(50)이 산발효조(10)에 메탄발효조(30) 사이에 연결설치되어 있으므로, 메탄발효조(30)의 pH를 단시간에 조절할 필요가 있는 경우에는 적합하지 않은 단점이 있으나, 본 실시예와 같이 CO2흡수탑(50)이 메탄발효조(30)에 연결되어 소화가스가 메탄발효조(30)에서 리싸이클되는 경우에는 메탄발효조(30)의 pH를 단시간에 조절할 수 있는 장점이 있다.In the above embodiment, since the CO 2 absorption tower 50 is installed between the methane fermentation tank 30 in the acid fermentation tank 10, it is not suitable when the pH of the methane fermentation tank 30 needs to be adjusted in a short time. Although there are disadvantages, as in the present embodiment, when the CO 2 absorption tower 50 is connected to the methane fermentation tank 30 and the digestion gas is recycled in the methane fermentation tank 30, the pH of the methane fermentation tank 30 is adjusted in a short time. There are advantages to it.

도 3은 본 발명의 또 다른 실시예를 보인 것으로서, CO2흡수탑(50)이 산발효조(10)에 설치되어 소화가스가 산발효조(10)에서 리싸이클되면서 CO2농도가 조절되도록 된 것을 보인 것이다. 이 경우에는 CO2흡수탑(50)에서 처리된 소화가스가 소화가스리싸이클관(61)을 통해 산발효조(10)로 리싸이클되어 산발효조(10) 소화가스의 CO2농도가 감소되고, 이와 같이 산발효조(10)에서 CO2농도가 조절된 소화가스가 메탄발효조(30)에 연결된 소화가스공급관(62)을 통해 메탄발효조(30)로 공급되어 메탄발효조(30)의 pH가 조절된다. 이러한 경우에는 산발효조(10)에서 소화가스의 CO2농도가 감소되기 때문에 이에 따라 산발효조(10)의 pH가 부적합하게 상승되지 않도록 운전할 필요가 있다.
Figure 3 shows another embodiment of the present invention, the CO 2 absorption tower 50 is installed in the acid fermentation tank 10, showing that the CO 2 concentration is adjusted as the digestion gas is recycled in the acid fermentation tank (10). will be. In this case, the digested gas treated in the CO 2 absorption tower 50 is recycled into the acid fermentation tank 10 through the digestion gas cycle pipe 61 to reduce the CO 2 concentration of the digestive gas of the acid fermentation tank 10. In the acid fermentation tank 10, the digestion gas having a controlled CO 2 concentration is supplied to the methane fermentation tank 30 through a digestion gas supply pipe 62 connected to the methane fermentation tank 30 to adjust the pH of the methane fermentation tank 30. In this case, since the CO 2 concentration of the digestion gas is reduced in the acid fermentation tank 10, it is necessary to operate such that the pH of the acid fermentation tank 10 is not increased inadequately.

이상과 같은 구성을 가지는 본 발명은 소화가스 중의 CO2농도를 조절하여 메탄발효조(30)의 pH를 조절하는 것이므로, 종래 완충액을 사용하는 경우에 비해 경제적이고, 완충액에 의해 소화액이 증가되는 문제가 발생되지 않으며, 운전도 용이하다. The present invention having the configuration as described above is to adjust the pH of the methane fermentation tank 30 by adjusting the CO 2 concentration in the digestion gas, it is more economical than when using a conventional buffer, there is a problem that the digestive fluid is increased by the buffer solution It is not generated and it is easy to drive.

Claims (4)

피처리물을 산발효시키는 산발효조(10)와, 상기 산발효조(10)의 하단부에 연결되어 산발효조(10)에서 처리된 소화액이 배출되는 소화액배출라인(20)과, 상기 소화액배출라인(20)의 타단에 연결되어 상기 산발효조(10)에서 처리된 소화액을 메탄발효시키는 메탄발효조(30)와, 상기 산발효조(10)의 상단부에 연결되어 산발효조(10)에서 발생된 소화가스가 배출되는 소화가스배출관(40)과, 이 소화가스배출관(40)에 연결되어 소화가스배출관(40)에서 배출되는 소화가스의 CO2농도를 감소시키는 CO2흡수탑(50)과, 상기 CO2흡수탑(50)과 메탄발효조(30) 사이에 구비되어 CO2흡수탑(50)에서 처리된 소화가스를 상기 메탄발효조(30)로 공급하는 소화가스공급관(60)을 포함하여 이루어져서, 상기 산발효조(10)에서 생성된 소화가스가 상기 CO2흡수탑(50)에서 처리되어 CO2농도가 감소되고, CO2농도가 감소된 소화가스가 상기 메탄발효조(30)로 공급됨으로써 메탄발효조(30)의 pH가 조절되는 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템.
An acid fermentation tank 10 for acid-fermenting the object to be treated, a digestive fluid discharge line 20 connected to a lower end of the acid fermentation tank 10 to discharge the digested liquid from the acid fermentation tank 10, and the digestive fluid discharge line ( 20 is connected to the other end of the methane fermentation tank (30) for methane fermentation of the digestion liquid treated in the acid fermentation tank 10, and the digestion gas generated in the acid fermentation tank (10) is connected to the upper end of the acid fermentation tank (10) and discharging the extinguishing gas discharge pipe 40 that is, the fire extinguishing gas discharge pipe 40 is connected to the extinguishing gas discharge pipe 40 CO 2 absorption tower 50, to reduce the CO 2 concentration of the digestion gas discharged from, and the CO 2 The digestion gas supply pipe 60 is provided between the absorption tower 50 and the methane fermentation tank 30 to supply the digestion gas treated in the CO 2 absorption tower 50 to the methane fermentation tank 30. CO 2 concentration of the digestion gas produced in fermentation tank 10 is treated in the CO 2 absorber (50) Reduced and, CO 2 concentration decreases the extinguishing gas is an anaerobic digestion system is capable of pH adjustment, it characterized in that the pH of the methane fermentation tank 30 is adjusted by being supplied to the methane fermentation tank 30.
제1항에 있어서, 상기 CO2흡수탑(50)은 하단부에 상기 소화가스배출관(40)의 배출단부가 연결되고, 상단부에는 상기 소화가스공급관(60)이 연결된 바디(52)와, 상기 바디(52) 내부에 구비되어 CO2를 용해시키기 위한 물을 분사하는 분사노즐(53)과, 일단은 상기 바디(52) 하단에 구비된 배수공(54)에 연결되고 타단은 상기 분사노즐(53)에 연결되어 배수공(54)으로 배수되는 물을 분사노즐(53)로 재공급하는 리싸이클관(55)과, 상기 리싸이클관(55)에 구비되어 상기 배수관(54)을 통해 배수되는 물을 가열하여 CO2를 탈기시키는 제1열교환기(56)와, 상기 CO2가 탈기된 물을 냉각시키는 제2열교환기(57)를 포함하여 이루어진 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템.
According to claim 1, The CO 2 absorption tower 50 is connected to the discharge end of the extinguishing gas discharge pipe 40 at the lower end, the body 52 is connected to the extinguishing gas supply pipe 60 to the upper end, the body (52) an injection nozzle (53) provided inside to inject water for dissolving CO 2 , one end of which is connected to a drain hole (54) provided at the bottom of the body (52), and the other end of the injection nozzle (53). A recycling pipe 55 connected to the recycle pipe 55 to supply the water drained to the drain hole 54 to the injection nozzle 53, and heated at the recycle pipe 55 to drain the water drained through the drain pipe 54. a first heat exchanger 56 and second heat exchanger (57) capable of adjusting pH anaerobic digestion system, characterized in that comprising an that the CO 2 is cooled to the deaerated water for degassing the CO 2.
피처리물을 산발효시키는 산발효조(10)와, 상기 산발효조(10)의 후단에 구비되어 산발효조(10)에서 처리된 소화액을 메탄발효시키는 메탄발효조(30)와, 상기 산발효조(10)의 상단부와 메탄발효조(30)의 상단부 사이에 연결되어 산발효조(10)에서 발생된 소화가스를 메탄발효조(30)로 공급하는 소화가스공급관(48)과, 상기 메탄발효조(30) 상단에 구비되어 메탄발효조 내부의 소화가스를 외부로 배출시키는 소화가스배출관(49)과, 상기 소화가스배출관(49)에서 배출되는 소화가스의 CO2농도를 감소시키는 CO2흡수탑(50)과, 상기 CO2흡수탑(50)에서 처리된 소화가스를 상기 메탄발효조(30)로 리싸이클시키는 소화가스리싸이클관(66)을 포함하여 이루어져서, 소화가스가 상기 CO2흡수탑(50)에서 처리되어 CO2농도가 감소됨으로써 메탄발효조(30)의 pH가 조절되는 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템.
An acid fermentation tank 10 for acid-fermenting the object to be treated, a methane fermentation tank 30 provided with a rear end of the acid fermentation tank 10 to methane fermentation of the digestion liquid treated in the acid fermentation tank 10, and the acid fermentation tank 10 Is connected between the upper end of the methane fermentation tank 30 and the upper end of the methane fermentation tank 30, the digestion gas supply pipe 48 for supplying the digestion gas generated in the acid fermentation tank 10 to the methane fermentation tank 30, the methane fermentation tank 30 to the top extinguishing gas discharge pipe 49 and the extinguishing gas discharge pipe 49 is reduced CO 2 absorption tower 50 to a CO 2 concentration of the digestion gas discharged from the said of having discharged the fire extinguishing gas inside the methane fermentation tank to the outside It comprises a digestion gas cycle pipe 66 for recycling the digestion gas treated in the CO 2 absorption tower 50 to the methane fermentation tank 30, the digestion gas is treated in the CO 2 absorption tower 50 to CO 2 The pH of the methane fermentation tank 30 is adjusted by decreasing the concentration. pH adjustable anaerobic digestion system of Jing.
피처리물을 산발효시키는 산발효조(10)와, 상기 산발효조(10)의 후단에 구비되어 산발효조(10)에서 처리된 소화액을 메탄발효시키는 메탄발효조(30)와, 상기 산발효조(10)의 상단부에 연결되어 산발효조(10)에서 발생된 소화가스가 배출되는 소화가스배출관(40)과, 이 소화가스배출관(40)에 연결되어 소화가스배출관(40)에서 배출되는 소화가스의 CO2농도를 조절하는 CO2흡수탑(50)과, 상기 CO2흡수탑(50)에서 처리된 소화가스를 상기 산발효조(10)로 리싸이클시키는 소화가스리싸이클관(61)과, 상기 산발효조(10)와 메탄발효조(30) 사이에 구비되어 산발효조(10)의 소화가스를 메탄발효조(30)로 공급하는 소화가스공급관(62)을 포함하여 이루어져서, 상기 산발효조(10)에서 생성된 소화가스가 상기 CO2흡수탑(50)에서 처리되어 CO2농도가 감소되고, CO2농도가 감소된 소화가스가 상기 메탄발효조(30)로 공급됨으로써 메탄발효조(30)의 pH가 조절되는 것을 특징으로 하는 pH조절이 가능한 혐기소화시스템.An acid fermentation tank 10 for acid-fermenting the object to be treated, a methane fermentation tank 30 provided with a rear end of the acid fermentation tank 10 to methane fermentation of the digestion liquid treated in the acid fermentation tank 10, and the acid fermentation tank 10 Fire extinguishing gas discharge pipe 40 is connected to the upper end of the extinguishing gas generated in the acid fermentation tank 10, and the extinguishing gas discharged from the extinguishing gas discharge pipe 40 is connected to the extinguishing gas discharge pipe (40) 2 CO 2 absorption tower 50, to control the concentration and the extinguishing gas recycling pipe 61, and the acid fermentation tank to recycle to the acid fermentation tank 10 wherein the extinguishing gas processed by the CO 2 absorption tower (50) ( 10) is provided between the methane fermentation tank 30 and the digestion gas of the acid fermentation tank 10 comprises a digestion gas supply pipe 62 for supplying the methane fermentation tank 30, the digestion generated in the acid fermentation tank 10 the gas is treated in the CO 2 absorber 50 is reduced and the CO 2 concentration, CO 2 concentration is reduced Anaerobic digestion system capable of adjusting pH, characterized in that the pH of the methane fermentation tank (30) is adjusted by supplying digestion gas to the methane fermentation tank (30).
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KR20160126244A (en) 2015-04-23 2016-11-02 한양대학교 산학협력단 Method for producing organic acid through organic acid fermentation by microorganism, and device for production of organic acid

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KR20160126244A (en) 2015-04-23 2016-11-02 한양대학교 산학협력단 Method for producing organic acid through organic acid fermentation by microorganism, and device for production of organic acid

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