KR20140112812A - Stabilizing apparatus and method for anaerobic digestion of organic wastes - Google Patents

Stabilizing apparatus and method for anaerobic digestion of organic wastes Download PDF

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Publication number
KR20140112812A
KR20140112812A KR20130027361A KR20130027361A KR20140112812A KR 20140112812 A KR20140112812 A KR 20140112812A KR 20130027361 A KR20130027361 A KR 20130027361A KR 20130027361 A KR20130027361 A KR 20130027361A KR 20140112812 A KR20140112812 A KR 20140112812A
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South Korea
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dissolved oxygen
tank
organic waste
stabilization
anaerobic digestion
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KR20130027361A
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Korean (ko)
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배성수
이창열
김태룡
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에스케이케미칼주식회사
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Priority to KR20130027361A priority Critical patent/KR20140112812A/en
Publication of KR20140112812A publication Critical patent/KR20140112812A/en

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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
    • 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
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/005—Valves
    • 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
    • C02F2209/42—Liquid level

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  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention relates to a stabilizing apparatus and a stabilizing method for improving the anaerobic digestion efficiency of organic waste and, more particularly, to a stabilizing apparatus and a stabilizing method for the anaerobic digestion of organic waste capable of manufacturing biogas rapidly and stably during anaerobic digestion by removing dissolved oxygen contained in the organic waste. Accordingly, the present invention provides the stabilizing apparatus comprising: a stabilizing tank for introducing the organic waste; a removing liquid supply part connected to the stabilizing tank to supply liquid for removing dissolved oxygen in the stabilizing tank; a stirrer installed inside the stabilizing tank to stir the organic waste and the liquid for removing dissolved oxygen; and a mixed liquid discharge pipe connected to the bottom surface of the stabilizing tank to discharge the mixed liquid of the organic waste having dissolved oxygen removed therefrom and the liquid for removing dissolved oxygen.

Description

Technical Field [0001] The present invention relates to an anaerobic digestion stabilization apparatus and method for anaerobic digestion of organic wastes,

The present invention relates to an apparatus and method for stabilizing anaerobic digestion efficiency of organic wastes, and more particularly, to an apparatus and method for stabilizing anaerobic digestion efficiency of anaerobic digestion of organic wastes by removing dissolved oxygen contained in organic wastes, An anaerobic digestion stabilization apparatus and method.

It is known that organic wastes such as sewage sludge, livestock manure, and food waste generated during the sewage treatment process can generate biogas through the anaerobic digestion process. Generated biogas are usually composed mainly of carbon dioxide and methane. After separation, methane is reused as an energy source such as a boiler, and carbon dioxide is compressed and stored.

In general, the anaerobic digestion process is subjected to a process such as single phase, abnormal or mid-temperature digestion for stabilization, and it is inefficient because the organic matter loss is less than 50% as compared with the case where a long residence time of 20 to 30 days or more is required. The methane content of biogas remains at 50%.

One of the reasons that the residence time is required to be long in such an anaerobic digestion process is that the stabilization time required for stable anaerobic microorganism capable of generating biogas is long, and even after stabilization, the biogas-producing microorganism Is low.

In the case of anaerobic digestion methane-producing microorganisms that produce methane from biogas-producing microorganisms, they are sensitive to temperature changes. In the presence of dissolved oxygen, metabolic processes using dissolved oxygen are preferentially proceeded. The process does not produce methane, and the concentration of dissolved oxygen may also affect the biogas production efficiency.

In Korean Patent No. 10-1047849, digested gas is recycled to the anaerobic digestion tank for agitation of organic waste in order to increase anaerobic digestion efficiency of organic waste.

However, if the digestion gas is used for agitation of the organic waste as described above, the hydrogen sulfide component in the extinguishing gas acts as a factor for inhibiting digestion efficiency, thereby reducing the anaerobic digestion efficiency.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for removing dissolved oxygen in organic wastes by retaining organic wastes in a stabilization tank and injecting a compound for removing dissolved oxygen into the organic wastes before introducing the organic wastes into the anaerobic digestion apparatus And an object of the present invention is to provide an apparatus and method for anaerobic digestion and stabilization of organic wastes which are capable of minimizing the environmental burden to be imposed on the anaerobic digestion methanogenic microorganisms in the anaerobic digestion apparatus by intrinsically blocking the inflow of oxygen into the anaerobic digestion apparatus .

Also, the present invention provides an apparatus and method for anaerobic digestion stabilization of organic waste for inducing methane production without using an acid production step required in a conventional anaerobic digestion process by using an organic waste subjected to a solubilization pretreatment reaction It has its purpose.

In order to accomplish the above object, the present invention provides a stabilization tank in which organic wastes are introduced; A removal liquid supply unit connected to the stabilization tank and supplying the dissolved oxygen removing liquid into the stabilization tank; An agitator installed in the stabilization tank for agitating the organic waste and the dissolved oxygen removing liquid; And a mixed liquid discharge pipe connected to the bottom of the stabilizing tank for discharging a mixed solution of organic waste and dissolved oxygen removing liquid from which dissolved oxygen has been removed.

Preferably, in the stabilization tank, a heating pipe for controlling the temperature of the mixed liquid of the organic waste and the dissolved oxygen removing liquid is provided so as to be submerged in the mixed liquid. In the heating pipe, And a coolant supply pump for circulating the coolant or the heat to the heating pipe is connected.

Preferably, the agitator is composed of a first agitator and a second agitator which are disposed in the stabilizing tank up and down, and the first agitator is provided with a plurality of first injection nozzles downward at a predetermined angle, A plurality of second injection nozzles are provided upward at a certain angle in the second agitator disposed at a lower portion of the agitator so that the carbon dioxide gas substrate supplied to each agitator is sprayed from the spray nozzle and simultaneously stirs the mixed liquid in the stabilization tank.

In addition, the stirrer is connected to a gas preheating heater for preheating the carbon dioxide gas substrate supplied to the agitator.

Preferably, the mixed liquid discharge pipe is provided with a discharge pipe control valve for opening and closing the mixed liquid discharge pipe, and the discharge pipe control valve is operated by the controller which receives the mixed liquid level information of the stabilizer.

The present invention also provides a process for producing organic wastes; Supplying a dissolved oxygen removing solution containing a dissolved oxygen removing compound to the stabilization tank; Stirring the mixture of the organic waste and the dissolved oxygen removing solution in the stabilization tank; And maintaining the mixed liquid at an optimum temperature through a heating pipe in the stabilization tank, wherein dissolved oxygen is removed from the organic waste.

Preferably, the step of stirring the mixed solution includes injecting a carbon dioxide gas in an agitator for stirring the mixed solution to cause a vortex in the mixed solution.

Also, preferably, the surface temperature of the heating pipe is maintained at 20 to 60 ± 10 ° C by the refrigerant or the heat flowing therein.

The apparatus and method for anaerobic digestion stabilization of organic wastes according to the present invention have the following advantages.

1. The organic waste and the dissolved oxygen removing compound are introduced into the anaerobic digestion device from the outside to mix the anaerobic digestion device with the anaerobic methanogenic microorganism.

Specifically, the anaerobic digestion stabilization apparatus of the present invention stores organic wastes introduced into the anaerobic digestion apparatus in the stabilization tank for the first time. In this storage step, the dissolved oxygen removal compound is added to organic wastes of the stabilization tank and mixed therein, Anaerobic digestion methanogenic microorganisms in the anaerobic digester (which cause changes in biogas production and biogas content depending on the concentration of dissolved oxygen) by transferring the organic waste from which the dissolved oxygen has been removed to the anaerobic digester The biogas production can be progressed with a stable yield.

That is, in order to remove the environmental load that the anaerobic methanogenic microorganisms of the anaerobic digestion apparatus receive due to the introduction of the organic waste into the anaerobic digestion apparatus containing the dissolved oxygen, the process of removing dissolved oxygen in the stabilization tank is preferentially performed , It is possible to minimize the environmental load that the microorganisms in the anaerobic digestion apparatus will receive.

2. In the anaerobic digestion stabilization apparatus of the present invention, by using the dissolved oxygen removing compound to remove dissolved oxygen in the organic waste, the effect of removing dissolved oxygen in the organic waste can be increased.

3. Solubilization Because the organic waste that has undergone the pretreatment reaction is used, the biogas can be directly produced without the organic acid production step required for the biogas production in the anaerobic digestion apparatus. Therefore, the residence time of the organic waste in the anaerobic digestion apparatus is shortened .

4. In the case of the anaerobic digestion stabilization apparatus according to the present invention, the organic waste is stored for 5 to 10 hours in the stabilization tank in order to remove the dissolved oxygen in the organic waste, and it takes less space than the anaerobic digestion apparatus It is possible to apply an apparatus for removing dissolved oxygen in the organic waste to the conventional anaerobic digestion process.

1 is a schematic diagram showing an apparatus for anaerobic digestion and stabilization of organic wastes according to an embodiment of the present invention;
FIG. 2 is a partially enlarged view of an apparatus for stabilizing anaerobic digestion of organic wastes according to an embodiment of the present invention,
3 is a partially enlarged view showing a substructure of a stabilization tank according to an embodiment of the present invention.
4 is a schematic view showing an anaerobic digestion system to which an apparatus for anaerobic digestion stabilization of organic wastes according to the present invention can be applied;

Hereinafter, the present invention will be described with reference to the accompanying drawings.

The present invention relates to a small stabilization device installed at a stage prior to an anaerobic digestion device in order to quickly and stably produce a biogas in an anaerobic digester (or an anaerobic digestion tank) By removing dissolved oxygen, the anaerobic digestion efficiency of the organic waste in the anaerobic digester can be increased.

Accordingly, the apparatus for stabilizing anaerobic digestion of organic wastes according to the present invention is configured to remove dissolved oxygen in organic waste by supplying a dissolved oxygen removing liquid containing a dissolved oxygen removing compound to a stabilization tank receiving and containing organic wastes .

As shown in FIGS. 1 and 2, the stabilizing tank 20 is a hollow cylindrical storage tank, which is supported by a base frame (not shown) so as to stand upright in a vertical direction, and has a heat insulating material 25 are attached to the outer surface.

A waste supply unit 10 for supplying organic waste to the stabilization tank 20 and a removal liquid supply unit 31 for supplying the dissolved oxygen removal liquid to the stabilization tank 20 are connected to the stabilization tank 20.

The waste supply unit 10 includes a waste supply pump that transports the organic waste that has undergone the solubilization pretreatment reaction and process in the pretreatment apparatus (or the pretreatment tank) to the stabilization tank 20, And a removing liquid supply pump for pressurizing the dissolved oxygen removing liquid in the stabilizing tank.

The removal liquid supply unit 31 includes a valve and a pressure gauge for opening / closing a removal liquid supply pipe connected between the removal liquid supply pump and the stabilization tank 20, and the dissolved oxygen removing liquid is supplied to the stabilization tank So that it can be continuously injected.

In addition, although not shown in the drawing, a waste input port and a removal liquid input port may be provided on the stabilization tank 20 in order to manually supply the organic waste and the dissolved oxygen removing liquid, and a cover for opening / .

In this embodiment, the organic waste and the dissolved oxygen removing solution are automatically supplied using the waste supply part 10 and the removed solution supply part 31. However, it is difficult to automatically supply the organic waste and the dissolved oxygen removing solution, The waste input port and the removal liquid input port are used. When the organic waste and the dissolved oxygen removing liquid are injected in a discontinuous manner, the cover is used to open and close as needed.

A biogas exhaust pipe (not shown) is connected to the upper portion of the stabilization tank 20 to collect and extract the biogas generated in the stabilization tank 20. The biogas produced in the stabilization tank 20 is transferred to the gas reservoir through the biogas discharge pipe (see FIG. 4).

The dissolving tank 30 is a storage tank for dissolving a dissolved oxygen removing compound in a solvent in a solvent to produce a liquid dissolved oxygen removing liquid, which is connected to a removing liquid supply pump through a pipe.

Although not shown in the drawing, the dissolution tank 30 is provided with a raw material inlet for supplying the dissolved oxygen removing compound, a water inlet for injecting the water (or solvent), and a stirrer for dissolving the dissolved oxygen removing mixture in the water And the dissolved oxygen scavenging liquid generated in the dissolving tank is supplied to the stabilizing tank 20 through the removal liquid supply unit 31. [

The dissolved oxygen removing compound may be 0.05 to 3% by weight of peptone, 0.01 to 2% by weight of yeast extract, 0 to 2% by weight of glucose, potassium dihydrogen phosphate (KH 2 PO 4 0 to 2% by weight of potassium hydroxide, 0 to 1% by weight of potassium dihydrogen phosphate (K 2 HPO 4 ), 0.001 to 0.1% by weight of magnesium sulfate (MgSO 4 ) and 0.0001 to 0.5% by weight of iron chloride (FeCl 3 ) . At this time, the amount of the component is the amount of solid content to be added per 100 mL of the organic waste. If the organic waste is in the aqueous solution state, it can be directly mixed. However, it is preferable to convert it into the aqueous solution state.

A first agitator 60 and a second agitator 61 are installed in the stabilization tank 20 to mix the organic waste and the dissolved oxygen removing liquid into the stabilization tank 20.

The first and second agitators 60 and 61 are installed in the middle and lower portions of the stabilizer tank 20 and include injection nozzles 62 and 63 capable of spraying a carbon dioxide gas, The carbon dioxide gas is injected through the injection nozzles 62 and 63 into the mixture in the stabilizing tank 20 (which is a mixture of the organic waste and the dissolved oxygen removing solution) to facilitate the mixing of the organic waste and the dissolved oxygen removing solution.

In other words, each of the stirrers 60 and 61 serves to supply a carbon dioxide gas substrate to the stabilizer 20 and to agitate the mixed liquid. As shown in FIGS. 1 to 3, And is connected to the gas supply blower 40 through a gas supply pipe 41 connected between the gas supply blower 40 and the stabilizer tank 20.

The gas supply blower 40 is fixed to one side of a base frame (not shown) and supplies a carbon dioxide gas substrate to the stabilization tank 20 through a gas supply pipe 41 and gas branch pipes 43 and 44 .

At this time, the gas supply blower 40 filters the foreign substances contained in the carbon dioxide gas by the gas filtration filter 42 provided on the gas supply pipe 41, and stabilizes the optimum clean gas required under the stabilization condition (20).

The gas supply pipe 41 is provided with a solenoid valve 47 for opening and closing the gas supply pipe 41 with the gas filtration filter 42 therebetween.

The gas supply pipe 41 is installed to extend in the vertical direction along the axial direction of the stabilizer tank 20 and includes first and second gas branch pipes 43 and 44 connected to the stabilizer tank 20 at a lower end thereof, This branch is composed of.

The gas branch pipes 43 and 44 are branched from the lower end of the gas supply pipe 41 and pass through the stabilization tank 20 so that one end thereof is inserted into the stabilization tank 20, And agitators 60 and 61 having injection nozzles 62 and 63 arranged annularly at one end thereof inserted into the nozzles 62 and 63, respectively.

As shown in FIGS. 2 and 3, the stirrers 60 and 61 are plate-shaped pipes having an inner annular shape and supported by the gas branch pipes 43 and 44, And a plurality of injection nozzles 62 and 63 are connected to the outer circumferential surface of the stabilization tank 20. [

The spray nozzles 62 and 63 are spaced apart from each other at regular intervals along the outer circumferential surface of the stirrer 60 and 61 and are rotated at a predetermined angle with respect to the stirrer 60 and 61 positioned parallel to the center of the stabilizer 20 And is inclined.

The injection nozzles 62 and 63 are for controlling the injection direction of the carbon dioxide gas discharged from the agitators 60 and 61. As shown in FIG. 3, the first nozzles 62 and 63, In the case of the second injection nozzle 63 provided in the second agitator 61, the central portion of the stabilization tank 20 is set at a predetermined angle toward the inner wall surface of the stabilization tank 20 As shown in Fig.

In addition to stirring by the rotation of the first and second agitators 60 and 61, the carbon dioxide gas substrate injected from the first and second injection nozzles 62 and 63 circulates and swirls the mixed liquid in the stabilizer tank 20 So that the mixing of the mixed solution in the stabilizing tank 20 (mixing of the organic waste and the dissolved oxygen removing solution) becomes easier.

In other words, the first and second injection nozzles 62 and 63 are mounted on the agitators 60 and 61 so as to face downward and upward from each other at a predetermined angle, respectively, so that they are jetted from the injection nozzles 62 and 63 And the mixed liquid is stirred by controlling the injection direction of the carbon dioxide gas.

That is, the carbon dioxide gas injected from the first injection nozzle 62 is directed downward toward the inner wall surface of the stabilization tank 20, and the carbon dioxide gas injected from the second injection nozzle 63 is upwardly directed toward the center of the stabilization tank 20 Circulating a mixture of the organic waste and the dissolved oxygen remover.

The first and second stirrers 60 and 61 inject the carbon dioxide gas to the stabilizer 20 through the respective injection nozzles 62 and 63 and simultaneously stir the mixed liquid so that the carbon dioxide gas is mixed with the mixed gas So that they can be mixed evenly.

At this time, the carbon dioxide gas substrate is supplied to the injection nozzles 62 and 63 of the agitators 60 and 61 through the gas supply pipe 41 and the gas branch pipes 43 and 44, and the gas branch pipes 43 and 44, A solenoid valve 45 for opening and closing the gas branch pipes 43 and 44 is provided.

A temperature control gas preheater 46 is provided on the gas supply pipe 41 to preheat the carbon dioxide gas supplied to the stabilizer 20 through the gas filter 42 to a predetermined temperature .

A level gauge 23 made of a transparent tube is provided on the outside of the stabilization tank 20 so that the level of the mixture in the stabilization tank 20 can be visually confirmed and the level of the stabilization tank 20 can be automatically The amount of the organic waste and the amount of the dissolved oxygen removing solution and the amount of the mixed solution can be adjusted.

Also, a mixed liquid discharge pipe (24) for discharging the mixed liquid generated in the stabilizing tank (20) is provided on the bottom surface of the stabilization tank (20).

The mixed liquid is a mixture of organic waste and dissolved oxygen removing liquid to remove dissolved oxygen contained in the organic waste. The mixed liquid discharge pipe 24 discharges the mixed liquid from which dissolved oxygen has been removed to the outside of the stabilizing tank 20.

The mixed liquid discharge pipe 24 is provided with a discharge pipe control valve 24a, and the discharge pipe control valve 24a is controlled by the controller 70. [

At this time, the mixed liquid discharged from the stabilization tank 20 is a mixture of organic waste and dissolved oxygen removing liquid, that is, a mixture in which dissolved oxygen in organic wastes is removed, that is, oxygen-free mixture.

Before the organic waste is supplied to the stabilization tank 20, the organic waste is first subjected to a solubilization pretreatment reaction and a process in a pretreatment apparatus (or a pretreatment tank). Then, the organic waste is subjected to an organic acid production step required for biogas production in the anaerobic digestion apparatus It is possible to directly produce the biogas, and it is possible to shorten the residence time of the organic waste in the anaerobic digester.

In addition, a heating pipe (50) is installed in the stabilizer tank (20) to control the temperature of the mixed liquid composed of the organic waste and the dissolved oxygen removing liquid.

The heating tube 50 is kept in the mixed solution by appropriately adjusting the temperature of the mixed solution so as to optimize the activity of the dissolved oxygen removing compound contained in the dissolved oxygen removing solution or the dissolved oxygen removing solution.

For example, the heating pipe 50 may be installed in the form of a coil along the wall in the stabilization tank 20 to provide a temperature condition in which the dissolved oxygen removing compound exhibits optimum activity.

The heating pipe 50 heats and maintains the mixed liquid at a proper temperature at which dissolved oxygen can be removed without changing the physical properties to satisfy effective mixing conditions (mixing conditions of the organic waste and the dissolved oxygen removing liquid) The mixed liquid in the stabilizing tank 20 is heated to a temperature of about 60 DEG C or less.

In the heating pipe (50), a cold / hot water circulation pump (55) and a cold / hot water tank (53) provided outside the stabilization tank (20) are connected.

The cold and cold circulation pump 55 is connected between the cold storage tank 53 and the heating pipe 50 to transmit the refrigerant or the heat stored in the cold storage tank 53 to the heating pipe 50, The refrigerant or the heat supplied to the pipe 50 performs heat exchange with the mixed liquid in the stabilizing tank 20 to maintain the temperature of the mixed liquid at an appropriate temperature.

At this time, the cold / hot water circulation pump 55 pressurizes and circulates the refrigerant or the heat through the heating pipe 50 according to the signal of the controller 70, A heater 54 is provided.

Although not shown in the drawing, a temperature indicator (not shown) is provided outside the stabilization tank 20 for checking the temperature of the mixed solution.

The controller 70 controls the operation of various electric components installed in the stabilizer 20 and controls the operation of the heater 54 and the cold cold circulation pump 55 in the cold storage tank 53 By controlling the temperature and the supply amount of the refrigerant or the heat supplied to the stabilizing tank 20, the mixed liquid in the stabilizing tank 20 can be suitably heated or cooled to form an optimal operating condition.

The controller 70 controls the operation of the waste supply pump 10, the removal liquid supply pump 31 and the discharge pipe control valve 24a connected to the stabilization tank 20 so that the supply amount of the organic waste and the dissolved oxygen removing liquid , The amount of discharged mixed liquid, and the like.

Also, a sterilizing heater 51 and a washing water spraying nozzle 71 for sterilizing the stabilizing tank 20 are installed in the stabilizing tank 20.

The sterilization heater 51 is installed inside and below the stabilization tank 20 and discharges the mixed solution from the stabilization tank 20 and sterilizes the inside of the stabilization tank 20 by raising the temperature to a high temperature. At this time, the surface temperature of the sterilizing heater 51 is raised to about 100 캜 or more.

The washing water spray nozzle 71 serves to clean the inside of the stabilizing tank 20 by spraying the washing water supplied through the washing water supply pump 73 outside the stabilizing tank 20 into the stabilizing tank 20 .

A solenoid valve 72 for controlling supply of washing water is connected between the washing water spray nozzle 71 and the washing water supply pump 73. The solenoid valve 72 is controlled by the controller 70 do.

In addition, the washing water spray nozzle 71 is installed on the top and inside of the stabilization tank 20 for protecting various electric and instrumentation devices and extending the service life thereof.

The operation of the apparatus for anaerobic digestion and stabilization of the organic waste will now be described.

And supplies the stabilized organic wastes to the stabilization tank 20 through the waste supply unit 10. The stabilized organic wastes are subjected to anaerobic digestion to produce biogas.

Then, the dissolved oxygen removing liquid for removing the dissolved oxygen of the organic waste is supplied to the stabilization tank 20 through the removal liquid supply unit 31.

At this time, the inflow amount of the organic wastes and the dissolved oxygen removing solution introduced into the stabilization tank 20 is controlled and adjusted through the controller 70, and the mixed solution level of the organic waste and the dissolved oxygen removing solution in the stabilization tank 20 is measured by a level gauge 23).

The controller 70 receives the level information of the stabilization tank 20 through the level gauge or the sensor provided on the level gauge 23. Based on the information, the controller 70 controls the operation of the waste supply unit 10 and the removal liquid supply unit 31 And also controls the operation of the discharge pipe control valve 24a provided in the mixed liquid discharge pipe 24. [

The controller 70 automatically stops driving the removal liquid supply unit 31 and stops the operation of the heater 54 of the cold storage tank 53 when the stabilizing tank 20 is filled with an appropriate amount of mixed liquid The driving power is applied to heat the refrigerant or the heat to a predetermined temperature for the optimum activity of the dissolved oxygen removing liquid.

Since the heating tube 50 is immersed in the mixed solution of the stabilizing tank 20, the heat generated on the surface can be directly transferred to the mixed solution to raise the mixed solution to an appropriate temperature.

The heating pipe 50 maintains the mixed liquid at a constant temperature (about 55 ± 5 ° C) under the condition that the surface temperature does not exceed a certain condition (20 to 60 ± 10 ° C in total) under the control of the controller 70 .

In this process, the agitators 60 and 61 in the stabilizing tank 20 continuously mix the mixed liquid to reduce the dissolved oxygen concentration in the mixed liquid and maintain the concentration of the mixed liquid in the upper and lower portions of the stabilizing tank 20 constant .

The controller 70 opens the mixed liquid discharge pipe 24 connected to the bottom of the stabilizer 20 to discharge the mixed liquid when the dissolved oxygen in the mixed liquid in the stabilizer tank 20 falls below a predetermined level, And the washing water is injected into the stabilizing tank 20 through the washing water spray nozzle 71 at a high pressure to automatically clean the stabilizing tank. Thereafter, the sterilizing heater 51 is operated to sterilize the stabilizing tank 20.

The sterilization heater 51 is rapidly heated to a sterilization condition of about 90-125 ± 5 ° C to sterilize the inside of the stabilization tank 20.

As described above, the anaerobic digestion stabilizer of the present invention removes dissolved oxygen from organic wastes, thereby reducing the load of the anaerobic methanogenic microorganisms that are loaded due to dissolved oxygen in organic wastes during anaerobic digestion, thereby increasing the biogas production yield The digestion time can be shortened.

That is, the anaerobic digestion stabilizer of the present invention essentially eliminates the step of generating anaerobic methane-producing microorganisms until the consumed oxygen in the newly injected organic waste is consumed, It can be improved.

4, the apparatus for anaerobic digestion stabilization of organic wastes according to the present invention uses organic wastes that have undergone a solubilization pretreatment reaction and a process so that anaerobic digestion can be carried out directly without anaerobic digestion, Gas production can be performed, so that the anaerobic digestion process can be simplified and the installation area of the anaerobic digestion device can be minimized. Further, anaerobic methanogenic microorganisms in the anaerobic digestion device can be anaerobically It is possible to stabilize the biogas production and increase the biogas production rate in the anaerobic digestion apparatus by removing dissolved oxygen in the organic waste by mixing with a compound capable of removing dissolved oxygen before the organic waste is injected into the digestion apparatus.

In addition, the anaerobic digestion stabilization apparatus of the present invention is advantageous in that the organic waste is sterilized by operating at a high temperature and the dissolved oxygen in the stabilization tank can be rapidly removed by lowering the maximum dissolved oxygen concentration of the mixed solution in the stabilization tank.

10: waste supply part 20: stabilization tank
23: level gauge 24: mixture liquid discharge pipe
30: Melting bath 31:
40: gas supply blower 50: heating pipe
51: Sterilization heater 53: Cold storage tank
55: cold water circulation pump 60: first stirrer
61: second stirrer 62: first injection nozzle
63: second injection nozzle 70: controller

Claims (11)

A stabilization tank 20 into which organic waste flows;
A removal liquid supply unit (31) connected to the stabilization tank and supplying the dissolved oxygen removing liquid into the stabilization tank;
An agitator (60, 61) installed in the stabilization tank for agitating the organic waste and the dissolved oxygen removing liquid;
A mixed liquid discharge pipe (24) connected to the bottom of the stabilizing tank for discharging a mixed liquid of organic waste and dissolved oxygen removing liquid from which dissolved oxygen has been removed;
And an anaerobic digestion stabilization device for anaerobic digestion of organic wastes.
The method according to claim 1,
Wherein a heating pipe (50) for controlling the temperature of the mixed liquid of the organic waste and the dissolved oxygen removing liquid is installed in the stabilizing tank so as to be able to be locked in the mixed liquid.
The method of claim 2,
Wherein the heating pipe is connected to a cold / hot water circulation pump (55) for circulating a refrigerant or a heat of the cold / hot water tank (53) through a heating pipe for heat exchange with the mixed liquid in the stabilizing tank Stabilizing device.
The method according to claim 1,
The agitator is composed of a first agitator 60 and a second agitator 61 arranged vertically in a stabilizing tank, and the first agitator is provided with a plurality of first injection nozzles 62 downward at a predetermined angle And a plurality of second injection nozzles 63 are provided upward at a predetermined angle in the second agitator disposed at the lower portion of the first agitator so that the carbon dioxide gas substrate supplied to each agitator is injected from the injection nozzle, (20) is adapted to agitate the mixed liquid.
The method of claim 4,
Wherein the agitator is connected to a gas preheater (46) for preheating a carbon dioxide gas substrate supplied to the agitator.
The method according to claim 1,
The mixed liquid discharge pipe is provided with a discharge pipe control valve (24a) for opening and closing the mixed liquid discharge pipe, and the discharge pipe control valve is operated by the controller (70) which receives the mixed liquid level information of the stabilizer. The anaerobic digestion Stabilizing device.
Supplying organic wastes to the stabilization tank;
Supplying a dissolved oxygen removing solution containing a dissolved oxygen removing compound to the stabilization tank;
Stirring the mixture of the organic waste and the dissolved oxygen removing solution in the stabilization tank;
Maintaining the mixed liquid at an optimum temperature through a heating pipe in the stabilizing tank;
Wherein the dissolved oxygen is removed from the organic waste, wherein the dissolved oxygen is removed from the organic waste.
The method of claim 7,
Wherein the step of stirring the mixed solution includes injecting a carbon dioxide gas in an agitator for stirring the mixed solution to cause a vortex in the mixed solution.
The method of claim 7,
Wherein the temperature of the surface of the heating tube is maintained at 20 to 60 占 폚 by the refrigerant or the heat flowing inside the heating tube.
The method of claim 7,
The dissolved oxygen removing compound may include 0.05 to 3 wt% of peptone, 0.01 to 2 wt% of yeast extract, 0 to 2 wt% of glucose, potassium hydroxide (KH 2 PO 4 ) 0 to 2% by weight of potassium hydroxide, 0 to 1% by weight of potassium dihydrogenphosphate (K 2 HPO 4 ), 0.001 to 0.1% by weight of magnesium sulfate (MgSO 4 ) and 0.0001 to 0.5% by weight of iron chloride (FeCl 3 ) A method for anaerobic digestion stabilization of organic waste.
The method of claim 7,
Wherein the organic wastes introduced into the stabilization tank are organic wastes subjected to a solubilization pretreatment reaction.
KR20130027361A 2013-03-14 2013-03-14 Stabilizing apparatus and method for anaerobic digestion of organic wastes KR20140112812A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180042979A (en) 2016-10-19 2018-04-27 주식회사 포스코건설 Initial operating method of anaerobic digester

Cited By (1)

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KR20180042979A (en) 2016-10-19 2018-04-27 주식회사 포스코건설 Initial operating method of anaerobic digester

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