KR102777022B1 - Anaerobic digesting apparatus for generating integration bio gas - Google Patents

Abstract

The present invention relates to an integrated biogas-generating anaerobic digestion device, comprising: a supply unit for receiving organic waste made of one or more materials including food waste and excrement; an anaerobic digestion unit including a digestion tank for storing organic waste introduced from the supply unit for a predetermined period of time and generating biogas; a discharge unit for discharging sediment collected at the bottom of the digestion tank into a retention tank; a recovery unit for recovering some of the sediment and returning it to the digestion tank; a gas storage unit for storing biogas produced in the digestion tank; and a water level control unit installed so that digested sludge that has undergone sufficient anaerobically digestion is discharged through a plurality of pipes installed inside the digestion tank for discharge and water level control, thereby allowing digested sludge that has not undergone sufficient anaerobically digestion to be discharged to a minimum, thereby allowing digested sludge introduced into the digestion tank to remain sufficiently and undergo anaerobic digestion, thereby allowing maximum biogas to be produced.

Description

{Anaerobic digesting apparatus for generating integration bio gas}

The present invention relates to an anaerobic digestion device, and more specifically, to an integrated biogas generating anaerobic digestion device in which one or more types of organic waste are introduced into a digestion tank, and the digestion period of organic waste is adjusted by adjusting the water level and discharge amount within the digestion tank, thereby maximizing the production of biogas.

Recently, the Biogas Production and Utilization Promotion Act (abbreviated as the Biogas Act) was enacted, which requires the installation of facilities to produce biogas by integrating one or more types of organic waste, including food waste, excrement, livestock waste, sewage sludge, and plant and animal remains. This Biogas Act can be applied to anaerobic digestion devices.

Meanwhile, an anaerobic digestion device is a device designed to convert organic waste stored for approximately 30 days or more into biogas by various microorganisms under anaerobic conditions such as the stirring state inside the digester, the concentration of the influent load, and the internal temperature of the digester. In brief, this anaerobic digestion process can proceed so that organic substances (carbohydrates, proteins, etc.) are hydrolyzed (amino acids, sugars, fatty acids, etc.), fermented (volatile organic acids (valeric acid, butyric acid, propionic acid), alcohol, and other fermentations), and then converted into biogas (methane, carbon dioxide, etc.) via acetic acid.

In this way, since each type of organic waste has a different anaerobic digestion period, there is a need to adjust the optimal anaerobic digestion period and continuously improve and develop anaerobic digestion equipment to extract a larger amount of biogas.

Republic of Korea Patent No. 10-1853069 (announced on April 27, 2018) Republic of Korea Publication Patent No. 10-2019-0115647 (Published on October 14, 2019)

The present invention, proposed to meet the above-mentioned needs, has the purpose of providing an integrated biogas generating anaerobic digestion device that ensures that one or more types of organic wastes introduced into a digestion tank are sufficiently stirred, adjusts the anaerobic digestion period by controlling the water level of the digested sludge inside the digestion tank so that the anaerobic digestion of the digested sludge progresses sufficiently, and generates biogas to the maximum extent.

In order to achieve the above-described object, the integrated biogas generating anaerobic digestion device according to the present invention comprises: a hydrolysis tank for receiving organic waste made of one or more materials including food waste and excrement, a supply unit including a first agitator for agitating organic waste in the hydrolysis tank, and a supply line connected to the hydrolysis tank for guiding organic waste discharged by a supply pump; an anaerobic digestion unit including a digestion tank for storing organic waste introduced through the supply line for a predetermined period of time to generate biogas, and a second agitator for agitating organic waste inside the digestion tank; a discharge unit including a first discharge line connected to the digestion tank for discharging sediment collected at the bottom of the digestion tank to the outside, and a storage tank for temporarily storing the sediment discharged through the first discharge line; a recovery unit including a recovery line for recovering a portion of the sediment discharged through the first discharge line and returning it to the digestion tank, and a line mix for mixing the sediment supplied from the recovery line by the recovery pump and the organic waste supplied from the hydrolysis tank; It can be composed of a gas storage unit including an exhaust line installed to discharge biogas generated in a digestion tank and a gas storage tank for storing biogas introduced through the exhaust line; and a water level control unit including a first level control pipe having an ‘L’ shape for discharging digested sludge in the digestion tank and having a lower portion located inside the digestion tank, a second level control pipe connected to be raised and lowered while surrounding an upper portion of the first level control pipe, a third level control pipe installed in the digestion tank to receive the first level control pipe and the second level control pipe and having a second discharge line connected to a storage tank, a first opening/closing valve for opening and closing the first level control pipe, and a first level control pipe installed to raise and lower the second level control pipe.

Here, the upper height of the second water level control pipe is the same as the water level of the digestion tank, and the height of the second water level control pipe can be changed by the first water level control valve to change the water level of the digestion tank.

Meanwhile, the water level control unit may be formed by including, as another example, a discharge pipe in the shape of a hollow column with open upper and lower sides, which is installed so that the lower side is submerged in the water surface of the digested sludge inside the digester, a second discharge line connected to the discharge pipe while one side is positioned near the water surface to discharge the digested sludge inside the discharge pipe to an external storage tank, and an S-trap formed in the second discharge line to prevent the leakage of biogas inside the digester through the second discharge line.

Here, the digested sludge introduced into the digestion tank remains for a preset period of time so that only the digested sludge in the limited area, i.e., the inside of the discharge pipe, is discharged through the second discharge line, and anaerobic digestion proceeds, and the discharge of the digested sludge with minimal anaerobic digestion progress is blocked.

In addition, the water level control unit may further include a second water level control valve installed in the second discharge line and installed to control the degree of opening or closing of the internal flow path of the second discharge line.

Here, the second water level control valve may include a body mounted on the second discharge line, a blocking member built into the body and moving while crossing the internal flow path of the second discharge line, and a handle for adjusting the moving height of the blocking member.

Due to this, the handle is connected to the lower part of the blocking member, and as the height of the blocking member is adjusted, the flow path of the second discharge line is opened from top to bottom, so that not only the water level of the digested sludge in the second discharge pipe is adjusted, but also the water level of the digested sludge in the digestion tank is adjusted, and the discharge amount of the digested sludge can be adjusted.

Additionally, the recovery unit may further include a heat exchanger installed to increase the temperature of the sediment flowing through the recovery line.

Here, the heat exchanger can be configured to exchange heat through high temperature water or heating.

Additionally, the exhaust pipe can be replaced with a hollow column shape with a closed upper surface.

In this case, the water level control unit may further include a water level control line connecting the upper surface of the discharge pipe and the exhaust line, and a third water level control valve installed to open and close the water level control line.

Due to this, the water level of the digested sludge in the discharge pipe is controlled as the biogas in the discharge pipe is collected or exhausted by opening and closing the water level control line, and the water level of the digested sludge in the digestion tank is also controlled, and the discharge amount of the digested sludge can be controlled.

Additionally, the water level control unit may further include a high level sensor and a low level sensor installed at the upper and lower portions of the discharge pipe to measure the water level inside.

Due to this, when the water level of the digested sludge reaches a high or low water level and a signal is generated, the water level control line can be opened and closed to adjust the water level.

According to the present invention, as described above, by sufficiently stirring through stirring, baffles, and line mixes within the digestion tank, and by adjusting the height of the second water level control pipe to adjust the water level and discharge amount within the digestion tank, one or more types of various organic wastes are sufficiently mixed to enable smooth anaerobic digestion, and the discharge amount can be adjusted by adjusting the water level of the digested sludge, and the anaerobic digestion period can be adjusted.

In addition, since the first water level control pipe and the digestion tank are installed at a location lower than the water surface of the digested sludge, there is an effect of preventing the phenomenon of biogas generated in the digestion tank being exposed to the outside through the first water level control pipe.

In addition, by discharging the digested sludge inside the discharge pipe built into the digestion tank through the second discharge line installed near the water surface, the digested sludge that has not undergone sufficient anaerobic digestion is discharged to a minimum, and as a result, the digested sludge introduced into the digestion tank remains sufficiently and anaerobic digestion proceeds, resulting in the effect of maximum biogas production.

In addition, a water level control line is connected to a discharge pipe with a closed upper surface, and biogas inside the discharge pipe is collected or exhausted as the water level control line is opened and closed, thereby controlling the water level of the digested sludge inside the discharge pipe to adjust the discharge amount of the digested sludge, and there is an effect of being able to adjust the period of anaerobic digestion of the digested sludge so that maximum biogas is produced.

And, since a portion of the sludge discharged from the digestion tank is recovered, its temperature is increased through heat exchange, and it is mixed with organic waste in the line mix before being supplied to the digestion tank, there is an effect that the internal temperature of the digestion tank can always be maintained at a constant level by adjusting the heat exchange and mixing ratio.

The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical idea of the present invention; therefore, the present invention should not be construed as being limited to matters described in such drawings.
FIG. 1 is a schematic drawing of an integrated biogas generating anaerobic digestion device according to a preferred embodiment of the present invention.
Figure 2 is a drawing illustrating the water level control unit illustrated in Figure 1.
FIG. 3 is a drawing illustrating another embodiment of the water level control unit illustrated in FIG. 1.
Figure 4 is an enlarged view of the water level control unit illustrated in Figure 3.
Figure 5 is a diagram showing the state of use of the second water level control valve illustrated in Figure 4.
FIG. 6 is a drawing illustrating another embodiment of the water level control unit illustrated in FIG. 1.
Figure 7 is an enlarged view of the water level control unit illustrated in Figure 6.

Hereinafter, with reference to the attached drawings, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention. In addition, among the configurations mentioned in various embodiments, similar configurations and related configurations in each embodiment may be replaced, exchanged, or added. However, when describing the operating principle of preferred embodiments of the present invention in detail, if it is determined that a specific description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

<Composition>

The integrated biogas generating anaerobic digestion device according to the present invention can be manufactured to anaerobically digest organic waste (W) to generate biogas, sediment and digested sludge (S). In addition, the biogas can be stored in a gas storage tank and then supplied separately, and the sediment and digested sludge (S) can be stored in a storage tank and then discharged. Hereinafter, for the convenience of explanation, the organic waste (W) refers to a material supplied from a hydrolysis tank (110), the digested sludge (S) refers to a material undergoing or completed anaerobically digesting inside a digestion tank (210), and the sediment refers to a material contained in the digested sludge that has a large specific gravity or weight and thus has settled to the bottom of the digestion tank (210).

Here, the organic waste (W) may be a single or mixed material of various materials such as food waste, livestock waste, excrement, sewage sludge, and plant and animal residues. The organic waste (W) may be biogasified for at least approximately 30 days or more depending on the anaerobic digestion conditions such as the stirring state of the digester, the supply amount and concentration, and the temperature inside the digester. Of course, the amount of biogas generated may vary depending on the type and mixing ratio of the materials included in the organic waste (W). Depending on these conditions, the period during which the digested sludge (S) remains inside the digester (210) may be optimally adjusted to maximize biogas generation.

At this time, the process of biogasification can proceed as follows: organic matter (carbohydrates, proteins, etc.) -> hydrolysis (amino acids, sugars, fatty acids, etc.) -> fermentation (volatile organic acids (valeric acid, butyric acid, propionic acid), alcohol, other fermentation) -> acetic acid -> methane, carbon dioxide generation.

An integrated biogas generating anaerobic digestion device according to a preferred embodiment of the present invention may include a supply unit (100), an anaerobic digestion unit (200), a discharge unit (300), a gas storage unit (400), a recovery unit (500), and a water level control unit (600), as shown in FIG. 1.

First, the supply unit (100) may include a hydrolysis tank (110), a first agitator (120), and a supply line (130).

Here, a hydrolysis tank (110) can be installed so that organic waste (W) can be introduced and temporarily stored.

Additionally, the first stirrer (120) can be installed to stir the organic waste (W) accommodated in the hydrolysis tank (110).

And the supply line (130) can be installed to supply organic waste (W) discharged from the hydrolysis tank (110) to the digestion tank (210). A supply pump (131) can be installed in this supply line (130).

In addition, water or mixed water may be supplied from the outside to adjust the moisture content of organic waste (W) accommodated in the hydrolysis tank (110) to an appropriate moisture content for supply and flow to the digestion tank (210).

Accordingly, organic waste (W) is introduced into the hydrolysis tank (110) and stirred by the first stirrer (120). At this time, if the moisture content of the organic waste (W) is lower than a preset value, water or mixed water is supplied to increase the moisture content to a preset appropriate range, and then supplied to the digestion tank (210). In addition, the moisture content of the organic waste (W) supplied from the hydrolysis tank (110) can be adjusted in advance and supplied according to the amount and moisture content of the digested sludge (S) supplied to the line mix (530) described below.

Next, the anaerobic digestion unit (200) may include a digestion tank (210) and a second agitator (220).

Here, the digestion tank (210) can be manufactured to store organic waste (W) introduced from the supply unit (100) for a certain period of time, for example, at least 30 days, and to generate biogas through an anaerobic digestion process during this period. At this time, the organic waste (W) in which the anaerobic digestion process is in progress or completed is referred to as digested sludge (S), and for convenience, the material inside or discharged from the digestion tank (210) is referred to as digested sludge (S).

In addition, the digestion tank (210) is approximately cylindrical, and the lower part is manufactured in a conical shape, and the heavy sediment separated while being stirred inside the digestion tank (210) can be well collected at the pointed lower part to which the first discharge line (310) is connected.

And the second stirrer (220) can be installed to stir the digested sludge (S) received in the digestion tank (210). This second stirrer (220) has a structure in which stirring blades rotate around a stirring axis, and this structure has the effect of causing the sediment separated from the digested sludge (S) during stirring to gather at the pointed bottom of the digestion tank (210).

Next, the discharge unit (300) may include a first discharge line (310) and a storage tank (320).

Here, the first discharge line (310) may be installed to discharge the sediment separated from the digested sludge (S) in the digestion tank (210) with stirring to an external storage tank (320). To this end, the first discharge line (310) may be installed to discharge the sediment from the bottom of the digestion tank (210) to the storage tank (320). A second opening/closing valve (340) and a control valve (330) may be installed in the first discharge line (310) to discharge the sediment collected at the bottom of the digestion tank (210) to the storage tank (320). Here, the second opening/closing valve (340) completely opens or closes the first discharge line (310), and the control valve (330) may adjust the opening degree of the first discharge line (310) to control the flow amount of the sediment. At this time, the second opening/closing valve (340) can be installed so that the recovery pump (511) is stopped when the digestion sludge is discharged through the control valve (330) and the recovery pump (511) is operated when it is closed. Accordingly, the sediment at the bottom of the digestion tank (210) can be discharged to the storage tank (320) by adjusting the degree of opening of the control valve (330) while the second opening/closing valve (340) is open. In addition, some of the digestion sludge (S) can be discharged together with the sediment through the first discharge line (310), and this digestion sludge (S) can be recovered by the recovery unit (500).

And the storage tank (320) can be installed to temporarily store the sediment introduced along the first discharge line (310) and discharge it when it reaches a certain amount.

Next, the gas storage unit (400) may include an exhaust line (410) and a gas storage tank (420).

Here, the exhaust line (410) can be installed so that the biogas accumulated in the upper space inside the digestion tank (210) is discharged to the outside. This exhaust line (410) can be installed by connecting the gas storage tank (420) to the upper space of the digestion tank (210).

And the gas storage tank (420) can be installed to store biogas introduced through the exhaust line (410).

Next, the recovery unit (500) may include a recovery line (510), a heat exchanger (520), and a line mix (530).

Here, the recovery line (510) can be installed to recover the digested sludge (S) among the sediment and digested sludge (S) discharged to the discharge unit (300) and supply it back to the digestion tank (210). A recovery pump (511), a heat exchanger (520), and a line mix (530) can be installed on this recovery line (510). Here, the digested sludge (S) has a lower specific gravity or weight than the sediment, so it can be recovered to the maximum extent possible by utilizing this.

In addition, the heat exchanger (520) may be installed to provide heat exchange to the sediment flowing through the recovery line (510) to raise the temperature to a preset temperature. For example, the heat exchanger (520) may be installed to ensure that high-temperature water is supplied through the water supply line (521), heat-exchanges with the digested sludge (S) of the recovery line (510), and then is discharged through the drain line (522). At this time, the heat exchanger (520) may set the rising temperature of the sediment in consideration of the temperature of the organic waste (W) supplied from the hydrolysis tank (110) to the line mix (530). Accordingly, the mixed organic waste (W) in which the organic waste (W) and the digested sludge (S) are mixed and discharged from the line mix (530) may have a temperature that is optimal for the anaerobic digestion reaction. In addition to heat exchange using high-temperature water, the heat exchanger (520) may be applied with a conventional heat exchange method including a method of applying heat.

And the line mix (530) can be manufactured and installed so that the digested sludge (S) passing through the heat exchanger (520) and the organic waste (W) supplied from the hydrolysis tank (110) flow together and are mixed. At this time, in order to maintain the moisture content of the mixed organic waste discharged from the line mix (530) in an optimal range, the moisture content of the digested sludge (S) recovered by the line mix (530) is measured, and the moisture content in the hydrolysis tank (110) can be adjusted based on this. Of course, since the moisture content of the digested sludge (S) is almost constant at this time, it may be sufficient to adjust only the moisture content in the hydrolysis tank (110). Therefore, the mixed organic waste discharged from the line mix (530) and introduced into the digestion tank (210) can have a moisture content and temperature optimal for the anaerobic digestion reaction. In other words, the digested sludge (S) is a healthy mass of microorganisms, and especially in the case of organic waste (W) mixed with various wastes, if it is pre-mixed in the line mix (530) and then supplied to the digestion tank (210), and is continuously stirred in the digestion tank (210), the anaerobic digestion reaction of the digested sludge (S) can proceed more actively.

Finally, the water level control unit (600) can be configured to control the water level of the digested sludge (S) inside the digestion tank (210) to control the period of time that the digested sludge (S) remains inside the digestion tank (210), thereby generating biogas as much as possible from the digested sludge (S).

For this purpose, as an example, a telescope valve may be installed in the digestion tank (210) as shown in FIGS. 1 and 2 as a water level control unit (600). This telescope valve may include a first water level control pipe (601), a second water level control pipe (602), a third water level control pipe (603), a first opening/closing valve (604), and a first water level control valve (605).

Here, the first water level control pipe (601) is approximately in the shape of an 'L' and may be installed so that the lower tip portion is located inside the digestion tank (210) in order to discharge the digested sludge (S) received in the digestion tank (210). At this time, the position where the first water level control pipe (601) is installed in the digestion tank (210) may be lower than the water surface of the digested sludge (S). As a result, the phenomenon of biogas generated in the digestion tank (210) being exposed to the outside through the first water level control pipe (601) can be prevented.

In addition, the second water level control pipe (602) may be installed so that only the upper surface is open, and a part of the upper part of the first water level control pipe (601) that is bent upwards penetrates the lower part and is located inside. At this time, the second water level control pipe (602) may be mounted so as to be able to be raised and lowered with respect to the first water level control pipe (601) in a screw-fastened manner. In addition, since the water level of the digestion tank (210) is set to be the same according to the upper height of the second water level control pipe (602), the water level of the digestion tank (210) may be changed by changing the height of the second water level control pipe (602) by utilizing the screw fastening.

In addition, the third water level control pipe (603) is mounted on the outer wall of the digestion tank (210), and a second discharge line (620) connected to the storage tank (320) is installed at the bottom, and can be installed to accommodate the first water level control pipe (601) and the second water level control pipe (602).

In addition, the first opening/closing valve (604) may be installed to open/close the first water level control pipe (601). Accordingly, the first opening/closing valve (604) always opens the first water level control pipe (601) while the fire extinguishing device is in operation, and may be operated to close the first water level control pipe (601) only when necessary, such as for maintenance work, to temporarily suspend the operation of the fire extinguishing device.

And the first water level control valve (605) can be installed to adjust the height of the second water level control pipe (602) screw-connected to the first water level control pipe (601). Therefore, when the second water level control pipe (602) is raised or lowered by the first water level control valve (605), the height of the digested sludge (S) charged in the third water level control pipe (603) also rises or lowers, and ultimately the water level in the digestion tank (210) can be adjusted. Of course, the biogas generated in the digestion tank (210) must not be leaked.

Meanwhile, the water level control unit (600) may include, as another example, a discharge pipe (610), a second discharge line (620), and a second water level control valve (630), as shown in FIG. 3.

Here, the discharge pipe (610) is a pipe-shaped cylindrical or square cylindrical pipe with the upper and lower surfaces open, and is installed so that the upper part is exposed above the water surface of the digested sludge (S) inside the digestion tank (210), and can be connected to a second discharge line (620) arranged at the water surface level.

Accordingly, when the digested sludge (S) inside the digestion tank (210) reaches a certain level, only some of the digested sludge (S) that has entered the discharge pipe (610) can be discharged to the outside through the second discharge line (620). As a result, the digested sludge (S) that has entered the digestion tank (210) is prevented from being discharged within a short period of time, thereby allowing anaerobic digestion to proceed while remaining there for a sufficient period of time, and the digested sludge (S) that has not undergone sufficient anaerobic digestion to be discharged to a minimum or blocked, thereby allowing maximum biogas to be produced.

In addition, the discharge pipe (610) is firmly fixed inside the digestion tank (210), and thus acts as a baffle that generates a vortex while the organic waste (W) is stirred by the second agitator (220), so that stirring can be performed perfectly. The discharge pipe (610) may have a circular cross-section and may be fixed while being spaced apart from the inner surface of the digestion tank (210), or may have a roughly semicircular cross-section and be attached and fixed to the inner surface of the digestion tank (210). In addition, a separately manufactured baffle may be attached and fixed to the inner surface of the digestion tank (210).

In addition, the second discharge line (620) may be installed to discharge some of the digested sludge (S) near the water surface that has entered the discharge pipe (610) among the digested sludge (S) inside the digestion tank (210) to the storage tank (320) of the discharge section (300). In addition, an S-trap (621) is formed in the second discharge line (620), which is to prevent gas leakage inside the digestion tank (210).

And the second water level control valve (630) may be installed to adjust the degree of opening and closing of the second discharge line (620), as shown in FIGS. 3 to 7. To this end, the water level control unit (600) may be provided with a body (631) mounted on the second discharge line (620), a blocking member (632) that is built into the body (631) and moves across the internal flow path of the second discharge line (620), and a handle (633) for adjusting the moving height of the blocking member (632). At this time, the blocking member (632) moves up and down to adjust the water level of the digested sludge (S) flowing through the second discharge line (620), and a handle (633) for adjusting the height of the blocking member (632) may be installed at the bottom of the blocking member (632).

Accordingly, as shown in Fig. 5, by manipulating the lower handle (633) so that the height of the blocking member (632) is adjusted so that it opens downward from the top of the flow path of the second discharge line (620), the water level of the digested sludge flowing through the second discharge line (620) can be adjusted. Accordingly, even the water level of the digested sludge inside the digestion tank (210) can be adjusted according to the opening height of the blocking member (632).

Meanwhile, the water level control unit (600) may further include, as another example, as shown in FIG. 6, a discharge pipe (610) having a columnar shape including a hollow cylinder or square column with a closed upper surface, a water level control line (640) connected to an exhaust line (410) from the upper surface of the discharge pipe (610), a high water level sensor (660) and a low water level sensor (670) mounted on the upper and lower portions of the discharge pipe (610).

Here, the discharge pipe (610) can be installed to receive biogas generated by anaerobically digesting the digested sludge (S) flowing into the discharge pipe (610).

In addition, the water level control line (640) may be installed to continuously collect the biogas received in the discharge pipe (610) or exhaust it to the exhaust line (410). To this end, a third water level control valve (650) for opening and closing the water level control line (640) may be installed in the water level control line (640). Accordingly, when the water level control line (640) is closed by the third water level control valve (650), the biogas is collected in the discharge pipe (610) as shown in Fig. 7(a), so that the water level in the discharge pipe (610) is lowered, and the digested sludge (S) may not be discharged to the second discharge line (620). This may be to prevent the digested sludge (S) in the discharge pipe (610) from being discharged and to allow the digested sludge (S) in the digestion tank (210) to continuously remain and continue the anaerobic digestion reaction. At this time, if the water level in the discharge pipe (610) is lowered and the digested sludge (S) is not discharged, the water level in the digestion tank (210) may rise on the contrary. Considering this, the third water level control valve (650) may be preset to open and close according to the water level detected by the high water level sensor (660) and the low water level sensor (670), and may be installed to automatically open and close when the water level is reached.

In addition, when the water level control line (640) is opened by the third water level control valve (650), the biogas in the discharge pipe (610) is discharged as shown in Fig. 7(b), thereby increasing the water level in the discharge pipe (610), and the digested sludge (S) can be discharged through the second discharge line (620). This may be to ensure that the digested sludge (S) in which the anaerobic digestion reaction has been sufficiently performed is discharged to the outside.

And when the water level inside the discharge pipe (610) becomes too low and is detected by the low water level sensor (670), the biogas inside the discharge pipe (610) is exhausted, and when the water level inside the discharge pipe (610) becomes too high and is detected by the high water level sensor (660), the third water level control valve (650) can be operated to collect the biogas inside the discharge pipe (610).

Therefore, by controlling the water level in the digestion tank (210) through controlling the water level in the discharge pipe (610), the anaerobic digestion reaction period of the digested sludge (S) can be shortened or extended depending on the type and mixing ratio of the organic waste, thereby allowing maximum biogas to be generated.

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical idea or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the patent registration claims described below rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the patent registration claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

100:Supply Department
110: Hydrolysis tank 120: 1st stirrer
130: Supply line 131: Supply pump.
200: Anaerobic digestion section
210: Digester 220: Second mixer
300:Exhaust
310: First discharge line 320: Reservoir
330: Control valve 340: Second shut-off valve.
400:Gas storage unit
410: Exhaust line 420: Gas storage tank.
500:Recovery Department
510: Recovery line 511: Recovery pump
520: Heat exchanger 521: Feed water line
522: Drain line 530: Line mix.
600: Water level control unit
601: 1st water level control pipe 602: 2nd water level control pipe
603: 3rd water level control pipe 604: 1st opening/closing valve
605: First level control valve 610: Discharge pipe
620:2nd discharge line 621:S trap
630: Second level control valve 631: Body
632: Blocking member 633: Handle
640: Water level control line 650: 3rd water level control valve
660: High level sensor 670: Low level sensor.
W: Organic waste S: Digestion sludge.

Claims (6)

A hydrolysis tank (110) for receiving organic waste (W) made of one or more types of materials including food waste and excrement, a first agitator (120) for stirring the organic waste in the hydrolysis tank (110), and a supply unit (100) including a supply line (130) connected to the hydrolysis tank (110) and guiding the organic waste (W) discharged by a supply pump (131);
An anaerobic digestion unit (200) including a digestion tank (210) that stores organic waste (W) introduced through the above supply line (130) for a certain period of time to generate biogas, and a second agitator (220) that agitates the organic waste (W) inside the digestion tank (210);
A discharge unit (300) including a first discharge line (310) connected to the digestion tank (210) to discharge sediment collected at the bottom of the digestion tank (210) to the outside, and a storage tank (320) for temporarily storing sediment discharged through the first discharge line (310);
A recovery line (510) for recovering the digested sludge (S) discharged together with the sediment through the first discharge line (310) and returning it to the digestion tank (210), and a recovery unit (500) including a line mix (530) for mixing the digested sludge (S) introduced through the recovery line (510) by the recovery pump (511) and the organic waste (W) supplied from the hydrolysis tank (110);
A gas storage unit (400) including an exhaust line (410) installed to discharge biogas generated in the above digestion tank (210) and a gas storage tank (420) for storing biogas introduced through the exhaust line (410); and
In order to discharge the digestion sludge (S) in the digestion tank (210), a first water level control pipe (601) having an 'L' shape and a lower portion located inside the digestion tank (210), a second water level control pipe (602) connected to be raised and lowered while surrounding the upper portion of the first water level control pipe (601), a third water level control pipe (603) installed in the digestion tank (210) to accommodate the first water level control pipe (601) and the second water level control pipe (602) and having a second discharge line (620) connected to a storage tank (320), a first opening/closing valve (604) for opening and closing the first water level control pipe (601), and a water level control unit (600) including the first water level control pipe (601) installed to raise and lower the second water level control pipe (602);
An integrated biogas generating anaerobic digestion device, wherein the upper height of the second water level control pipe (602) is the same as the water level of the digestion tank (210), and the height of the second water level control pipe (602) is changed by the first water level control valve (605) to change the water level of the digestion tank (210).
In claim 1,
The above water level control unit (600) includes a discharge pipe (610) in the shape of a hollow column with an upper and lower side open, which is installed so that the lower side is submerged in the water surface of the digested sludge (S) inside the digestion tank (210), a second discharge line (620) connected to the discharge pipe (610) with one side positioned near the water surface to discharge the digested sludge (S) inside the discharge pipe (610) to an external storage tank (320), and an S-trap (621) formed in the second discharge line (620) to prevent the leakage of biogas inside the digestion tank (210) through the second discharge line (620).
An integrated biogas generating anaerobic digestion device configured to discharge only the digested sludge (S) introduced into the inside of the above discharge pipe (610), i.e., a limited area, through the second discharge line (620), thereby allowing the digested sludge (S) introduced into the inside of the digestion tank (210) to remain for a preset period of time and undergo anaerobic digestion, and blocking the discharge of the digested sludge (S) with minimal anaerobic digestion.
In claim 2,
The above water level control unit (600) is installed in the second discharge line (620) and further includes a second water level control valve (630) installed to control the degree of opening or closing of the internal flow path of the second discharge line (620).
The above second water level control valve (630) includes a body (631) mounted on the second discharge line (620), a blocking member (632) built into the body (631) and moving across the internal flow path of the second discharge line (620), and a handle (633) for adjusting the moving height of the blocking member (632).
The above handle (633) is connected to the lower part of the blocking member (632), and as the height of the blocking member (632) is adjusted, the flow path of the second discharge line (620) is opened from top to bottom, the water level of the digested sludge (S) in the second discharge pipe (610) is adjusted, and thus the water level of the digested sludge (S) in the digestion tank (210) is adjusted, and the discharge amount of the digested sludge (S) and the anaerobic digestion period are adjusted. An integrated biogas generating anaerobic digestion device.
In claim 1 or 2,
The above recovery unit (500) further includes a heat exchanger (520) installed to increase the temperature of the sediment flowing through the recovery line (510).
The above heat exchanger (520) is an integrated biogas generating anaerobic digestion device configured to exchange heat through high temperature water or heating.
In claim 2 or 3,
The above discharge pipe (610) is a hollow column shape with a closed upper surface,
The above water level control unit (600) further includes a water level control line (640) connecting the upper surface of the discharge pipe (610) and the exhaust line (410), and a third water level control valve (650) installed to open and close the water level control line (640).
An integrated biogas generating anaerobic digestion device configured such that the water level of the digested sludge (S) in the discharge pipe (610) is controlled as the biogas in the discharge pipe (610) is collected or exhausted when the water level control line (640) is opened and closed, thereby controlling the water level of the digested sludge (S) in the digestion tank (210), and controlling the discharge amount of the digested sludge (S) and the anaerobic digestion period.
In claim 5,
The above water level control unit (600) further includes a high water level sensor (660) and a low water level sensor (670) installed at the upper and lower portions of the discharge pipe (610) to measure the water level inside.
An integrated biogas generating anaerobic digestion device configured to open and close a water level control line (640) to adjust the water level when a signal is generated when the water level of the above-mentioned digested sludge (S) reaches a high or low water level.

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